Younger Dryas mammoth-killing comet questioned

Paul bristolia at yahoo.com
Thu Jan 29 18:01:50 EST 2009

1. Mammoth-killing comet questioned BBC News, UK
"A study of wildfires after the last ice age has cast doubt
on the theory that a giant comet impact wiped out woolly
mammoths and prehistoric humans."

http://news.bbc.co.uk/1/hi/sci/tech/7854348.stm
http://news.bbc.co.uk/nolpda/ukfs_news/hi/newsid_7854000/7854348.stm

2. 12900 Years Ago: North American Comet Impact Theory
Disproved, Science Daily (press release) - Jan 26, 2009

http://www.sciencedaily.com/releases/2009/01/090126173729.htm

Journal reference:

J. R. Marlon, P. J. Bartlein, M. K. Walsh, S. P. Harrison, et al. Wildfire
responses to abrupt climate change in North America. Proceedings
of the National Academy of Science, DOI: 10.1073_pnas.0808212106

Yours,

Paul H.

Meteorite Impact Structures in Sundaland ???

Paul bristolia at yahoo.com
Thu Jan 29 17:53:41 EST 2009

Does anyone know anything about these so-called impact structures?

HC potential of meteorite impact structures, focus on Sundaland

http://www.mail-archive.com/iagi-net@iagi.or.id/msg03653.html

This talk states:

"Several impact structures have been recently discovered in pre-Tertiary
Peninsular Malaysia. In the Langkawi islands three of four arcuate
ridges are associated with cleaved quartz that crops out as a sill and dyke
complex. Other shock-metamorphic features include ribbon quartz and
mosaicism. The two major craters, named Mahsuri Rings, partially overlap and
each is about 2.4 km across. In 280o - 100o direction their centres are 600
metres apart."

and

"Another proven impact structure is the Paloh Ring that straddles the state
boundary between Terengganu and Pahang. The proof consists of planar
deformation features (PDFs) and mosaicism in vein quartz intruded into
undivided Carboniferous metasedimentary strata that compose the lower
eastern slope of the 623m high Paloh peak."

Does anyone know anything about these alleged impact craters?

Yours,

Paul H.

Artifacts Embedded in Suevite Reported from Malaysia ?????

Paul bristolia at yahoo.com
Thu Jan 29 17:46:20 EST 2009

Does anyone know about this "discovery"?

USM Archaeological discovery can change world history
Article Released Thu-29th-January-2009 09:43 GMT
Mohamad Abdullah Institution: Universiti Sains Malaysia

http://www.researchsea.com/html/article.php/aid/3937/cid/6/research/usm_archaeological_discovery_can_change_world_history.html?PHPSESSID=b8204aec6f223e9ca02c1eae347bf168

In part the article stated:

"Penang, Malaysia 29 January – In a press conference this morning, The Centre for Archaeological Research Malaysia (CARM) announced evidence of human existence in Malaysia from approximately 1.83 million years ago."

Also, it stated:

"The advance study at Bukit Bunuh of Lenggong in the state of Perak,
Malaysia was conducted in 2008. This new evidence consists of stone
tools artefacts such as hand axe and flake tools. Those artefacts were
found cemented in a rock called suevite, a type of rock formed by
the impact of meteorite. The rock has been dated using a fission track
dating method in Geochronology Lab in Japan, Tokyo, and discloses
a date of approximately 1.83 ± 0.61 million years old."

and it stated:

"Handaxe that was made out of suevite has also been discovered.
Meteorite impact had caused the native stone to melt and formed a
new stone called suevite. This impact has been substantiated by the
presence of suevite, crossed- lamellar microstructure on quartz,
physical anomaly evidence and geomorphology evidence of an
impact crater. The distribution of suevite is approximately 3-4 km2"

Does anyone know about the this alleged meteorite impact crater?

Another article is:

Leggong had early humans 1.8m years ago (updated)

http://thestar.com.my/news/story.asp?file=/2009/1/29/nation/20090129172833&sec=nation

Best Regards,

Paul H.

Downloadable PDF Files (Papers) About the Impact Origin of Moon

Paul bristolia at yahoo.com
Wed Jan 28 10:33:24 EST 2009

Dear Friends,

Links to downloadable PDF files of paper concerning the impact origin
of Moon can be found in “EART 206 -Great Papers in the Earth
Sciences” at:

http://es.ucsc.edu/~rcoe/eart206/206-05.htm

They are:

1. Newsom, H. and S.R. Taylor, 1989, Geochemical implications of the
formation of the Moon by a single giant impact, Nature. vol. 338, pp. 29-344.

http://es.ucsc.edu/~rcoe/eart206/Taylor&Newsome_MoonFm_Nature89.pdf

2. Benz, W., Slattery, W.L. and A.G. Cameron, Snapshots from a three-
dimensional modeling of a giant impact, in Origin of the Moon
(Hartmann, Phillips and Taylor, eds.), pp. 617-620, Lunar and Planetary
Institute Press, Houston, 1986.

http://es.ucsc.edu/~rcoe/eart206/Benz&Slattery_GiantImpact_OrigMoon86.pdf

3. Canup, R. M., and E. Asphaug, 2001, Origin of the moon in a giant
impact near the end of the Earth formation, Nature,, vol. 412, pp. 708-712.

http://es.ucsc.edu/~rcoe/eart206/Canup&Asphaug_Moon_Nature_01.pdf

4. Asphaug, E., C. B. Agnor, and Q. Williams, Hit-and-run planetary
collisions. Nature. vol. 439, pp. 155-160.

http://es.ucsc.edu/~rcoe/eart206/Asphaug_Hit-and-run_Nature06.pdf

Yours,

Paul H.

Online PDF Files About Meteorite Impacts and Large Igneous Provinces

Paul bristolia at yahoo.com
Wed Jan 28 10:24:08 EST 2009

Below are some papers, about meteorite impacts as triggers to
large igneous provinces that can downloaded as PDF files.

Jones, A. P., 2005, Meteorite Impacts as Triggers to Large Igneous
Provinces. Elements. vol. 1, pp. 277–281.

“The coincidence between the expected frequency of such impact
events combined with the similarity in magma volumes of LIPs
suggests that large meteorite impacts may be capable of triggering
LIPs and mantle hotspots from a point source which is subsequently
buried. Can the impact model explain any LIP?

PDF file at:
http://www.es.ucsc.edu/~rcoe/eart290C/Jones_LIPsImpacts_Elements05.pdf

Abstract at:
http://elements.geoscienceworld.org/cgi/content/abstract/1/5/277

Link to this PDF file is also found in “EART 206 -Great Papers
in the Earth Sciences” at:
http://es.ucsc.edu/~rcoe/eart206/206-05.htm

++++++++++

Saunders, A. D., 2005, Large Igneous Provinces: Origin and
Environmental. Elements. vol. 1, pp. 259–263

PDF file at:
http://www.elementsmagazine.org/archives/e1_5/e1_5_art_saunders.pdf

Abstract at:
http://elements.geoscienceworld.org/cgi/content/abstract/1/5/259

++++++++++

Ivanov, B. A., and H. J. Melosh, 2003, Impacts do not initiate
volcanic eruptions: Eruptions close to the crater. Geology. vol. 31,
no. 10, pp. 869-872.

PDF file at:
http://www.lpl.arizona.edu/~jmelosh/ImpactVolcanism.pdf

Abstract at:
http://geology.geoscienceworld.org/cgi/content/abstract/31/10/869

++++++++++

Impact induced melting and the development of
large igneous provinces

Jones, A. P., G. D. Price, N. J. Price P. S. DeCarli, and R. A.
Clegg, 2002, Earth and Planetary Science Letters, vol. 202,
pp. 551-561.

PDF file at:
http://www.es.ucl.ac.uk/people/d-price/papers/152.pdf

++++++

“Large Igneous Provinces (LIPs)”: Definition, recommended
terminology, and a hierarchical classification by Hetu C. Sheth

http://www.mantleplumes.org/LIPClass.html

Yours,

Paul H.

New Paper on Permian Extinctions

Paul bristolia at yahoo.com
Wed Jan 23 09:48:28 EST 2008

The Journal of Geology has just published a new paper on Permian
extinctions. It is:

Retallack, G. J., and A. H. Jahren, 2008, Methane Release from
Igneous Intrusion of Coal during Late Permian Extinction Events
Journal of Geology. vol. 116, no. 1, pp. 1-20.

http://www.journals.uchicago.edu/doi/abs/10.1086/524120

"Abstract

Unusually large and locally variable carbon isotope excursions
coincident with mass extinctions at the end of the Permian
Period (253 Ma) and Guadalupian Epoch (260 Ma) can be attributed
to methane outbursts to the atmosphere. Methane has isotopic
values (δ13C) low enough to reduce to feasible amounts the
carbon required for isotopic mass balance. The duration of the
carbon isotopic excursions and inferred methane releases are here
constrained to <10,000 yr by counting annual varves in lake
deposits and by estimating peat accumulation rates. On
paleogeographic maps, the most marked carbon isotope excursions
form linear arrays back to plausible methane sources: end-Permian
Siberian Traps and Longwood-Bluff intrusions of New Zealand and
end-Guadalupian Emeishan Traps of China. Intrusion of coal
seams by feeder dikes to flood basalts could create successive
thermogenic methane outbursts of the observed timing and
magnitude, but these are unreasonably short times for
replenishment of marine or permafrost sources of methane.
Methane released by fracturing and heating of coal during
intrusion of large igneous provinces may have been a planetary
hazard comparable with bolide impact"

Yours,

Paul

Free PDF Files of GSA Fieldguides Now Available - Includes Impact Craters

Paul bristolia at yahoo.com
Thu Jan 22 23:02:45 EST 2009

Dear Friends,

The chapters of the following GSA field guides can
downloaded freely as PDf files for an unknown period
of time.

Some chapters, which deal with impact craters are:

1. The Jeptha Knob cryptoexplosion structure, Kentucky
by C. Ronald Seeger, Centennial Field Guide Volume 6

http://www.gsajournals.org/archive/0-8137-5406-2/6/0/pdf/i0-8137-5406-2-6-0-17.pdf

2. The Calvin 28 cryptoexplosive disturbance, Cass
County, Michigan by Randall L. Milstein, Centennial
Field Guide Volume 3

http://www.gsajournals.org/archive/0-8137-5403-8/3/0/pdf/i0-8137-5403-8-3-0-315.pdf

3. The Kentland Dome, Indiana: A structural anomaly
by Raymond C. Gutschick, Centennial Field Guide Volume 3

http://www.gsajournals.org/archive/0-8137-5403-8/3/0/pdf/i0-8137-5403-8-3-0-337.pdf

and 4. Meteor Crater, Arizona by Eugene M. Shoemaker,
Centennial Field Guide Volume 2

http://www.gsajournals.org/archive/0-8137-5402-X/2/0/pdf/i0-8137-5402-X-2-0-399.pdf

Many other PDF files for these field guides can be found at:

Centennial Field Guide Volume 1, Cordilleran Section of
the Geological Society of America ISBN: 0-8137-5401-1
http://www.gsajournals.org/perlserv/?request=get-specialpub-toc&isbn=0-8137-5401-1

Centennial Field Guide Volume 2 Rocky Mountain Section of the
Geological Society of America ISBN: 0-8137-5402-X
http://www.gsajournals.org/perlserv/?request=get-specialpub-toc&isbn=0-8137-5402-X

Centennial Field Guide Volume 3 North-Central Section of the
Geological Society of America ISBN: 0-8137-5403-8
http://www.gsajournals.org/perlserv/?request=get-specialpub-toc&isbn=0-8137-5403-8

Centennial Field Guide Volume 4 South-Central Section of the
Geological Society of America ISBN: 0-8137-5404-6
http://www.gsajournals.org/perlserv/?request=get-specialpub-toc&isbn=0-8137-5404-6

Centennial Field Guide Volume 5 Northeastern Section of the
Geological Society of America ISBN: 0-8137-5405-4
http://www.gsajournals.org/perlserv/?request=get-specialpub-toc&isbn=0-8137-5405-4

Centennial Field Guide Volume 6 Southeastern Section of the
Geological Society of America ISBN: 0-8137-5406-2
http://www.gsajournals.org/perlserv/?request=get-specialpub-toc&isbn=0-8137-5406-2

The links to all of these volumes can be found as links in
"Field Guides" at http://www.gsajournals.org/perlserv/?request=get-collection&coll_title=Field%20Guides

Yours,

Paul H.

Moon Rock Suggests Early Moon’s Core Had a Magnetic Field

Paul bristolia at yahoo.com
Wed Jan 21 15:52:46 EST 2009

Rock Suggests Early Moon’s Fiery Core Churned a Magnetic Field
New York Times, United States - Jan 19, 2009

http://www.nytimes.com/2009/01/20/science/space/20moon.html?ref=science

Moon Rock Suggests the Young Moon Had a Fiery Core and
a Magnetic Field

http://blogs.discovermagazine.com/80beats/2009/01/20/moon-rock-suggests-the-young-moon-had-a-fiery-core-and-a-magnetic-field/

Tiny Moon Rock Reveals Molten Lunar Core
January 20, 2009, 13:40 CST

http://www.redorbit.com/news/space/1625782/tiny_moon_rock_reveals_molten_lunar_core/

Garrick-Bethell, I., B. P. Weiss, D. L. Shuster, J. and Buz,
2009, Early Lunar Magnetism. Science, vol. 323, no. 5912,
pp. 356 - 359

http://www.sciencemag.org/cgi/content/abstract/323/5912/356

Yours,

Paul H.

PDF files for Geological Society of America and Geology Papers Now Available

Paul bristolia at yahoo.com
Sat Jan 17 23:06:52 EST 2009

Dear Friends,

For an unknown period of time free PDF files of papers
published in "Geology" and "Geological Society of America
Bulletin" can be downloaded free of charge. A person can
access them using the search page at:

http://gsabulletin.gsapubs.org/search.dtl

and the archive pages at:

http://gsabulletin.gsapubs.org/archive/

and

http://geology.gsapubs.org/archive/

For example, one paper that can be downloaded is:

Vance T. Holliday, David A. Kring, James H. Mayer,
and Ronald J. Goble, 2005, Age and effects of the
Odessa meteorite impact, western Texas, USA
Geology. vol. 33, pp. 945 - 948. It is at:

http://geology.gsapubs.org/cgi/content/abstract/33/12/945?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=1&title=odessa&andorexacttitle=and&andorexacttitleabs=and&andorexactfulltext=and&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

and PDF file at:

http://geology.gsapubs.org/cgi/reprint/33/12/945?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=1&title=odessa&andorexacttitle=and&andorexacttitleabs=and&andorexactfulltext=and&searchid=1&FIRSTINDEX=0&sortspec=relevance&resourcetype=HWCIT

I do not know how long these PDF files will remain free
to download. It is best to get what you want now.

Yours,

Paul

New ice core evidence for a volcanic cause of the A.D. 536 dust veil

Paul bristolia at yahoo.com
Mon Jan 12 10:54:07 EST 2009

A 2008 paper in AGU’s Geophysical Research Letters presents
an alternative interpretation of ice core evidence to that
discussed in “[meteorite-list] Comet smashes triggered ancient
famine ???” can be found in:

Larsen, L. B., B. M. Vinther, K. R. Briffa, T. M. Melvin, H. B.
Clausen, P. D. Jones, M.-L. Siggaard-Andersen, C. U. Hammer,
M. Eronen, H. Grudd, B. E. Gunnarson, R. M. Hantemirov,
M. M. Naurzbaev, and K. Nicolussi, 2008, New ice core
evidence for a volcanic cause of the A.D. 536 dust veil.
Geophysical Research Letters. vol. 35, no. L04708,
doi:10.1029/2007GL032450, 2008

http://www.agu.org/pubs/crossref/2008/2007GL032450.shtml
http://adsabs.harvard.edu/abs/2008GeoRL..3504708L

This paper is discussed in “536 AD and all that” at:

http://www.realclimate.org/index.php/archives/2008/03/536-ad-and-all-that/

and “Comments on: 536 AD and all that” at:

http://www.realclimate.org/index.php/archives/2008/03/536-ad-and-all-that/feed/

It should be interesting to how these differences of opinions
are resolved in the future.

Some related articles are:

1. Axboe, M., 1999, The year 536 and the Scandinavian gold
hoards. Medieval archaeology. vol. 43, pp. 186-188.

Link and TOC at:
http://ads.ahds.ac.uk/catalogue/ARCHway/toc.cfm?rcn=1089&vol=43

PDF file at:
http://ads.ahds.ac.uk/catalogue/adsdata/arch-769-1/ahds/dissemination/pdf/vol43/43_186_188.pdf

2. D'Arrigo, R., D. Frank, G. Jacoby and N. Pederson, 2001,
Spatial Response to Major Volcanic Events in or about AD 536,
934 and 1258: Frost Rings and Other Dendrochronological
Evidence from Mongolia and Northern Siberia: Comment on
R. B. Stothers, ‘Volcanic Dry Fogs, Climate Cooling, and
Plague Pandemics in Europe and the Middle East’ (Climatic
Change, 42, 1999). Climate Change. vol. 49, no. 1-2,
pp 239-246.

Abstract at:
http://www.springerlink.com/content/lj2k364539rl5613/ and link at
http://www.pitt.edu/~mrosenme/Mongolia_Workshop/links.htm

PDF file at:
http://www.pitt.edu/AFShome/m/r/mrosenme/public/html/Mongolia_workshop/D_Arrigo_et_al_2001.pdf

3. Grattan, J. P., and F. B. Pyattb, 1999, Volcanic eruptions dry
fogs and the European palaeoenvironmental record: localised
phenomena or hemispheric impacts? Global and Planetary
Change. vol. 21, no. 1-3, pp. 173-179.

Abstract at:
http://adsabs.harvard.edu/abs/1999GPC....21..173G

PDF file at:
http://cadair.aber.ac.uk/dspace/bitstream/2160/226/1/env%20impact%20of%20volcanic%20gases1.pdf

4. Mardon, 1997, The mystery of the 536 A.D. dust veil event:
Was it a cometary or meteorite impact? Large Meteorite
Impacts and Planetary Evolution: Sudbury 1997 Conference
Abstract Volume. Sudbury, September 3, 1997

Citation is “English*Published material that has appeared in print”
at: http://www.austinmardon.org/page2.htm

Pdf file at:
http://www.lpi.usra.edu/meetings/impacts97/pdf/6019.pdf

5. Stothers, R. B., 1999, Volcanic Dry Fogs, Climate Cooling,
and Plague Pandemics in Europe and the Middle East. Climatic
Change, vol. 42, no. 4, pp. 713-723.

Abstract at:
http://www.springerlink.com/content/p79818w71777m113/

6. Braille, M., 2007, The case for significant numbers of
extraterrestrial impacts through the late Holocene. Journal
of Quaternary Science. vol. 22, no. 2, pp. 101-109.
Abstract at:
http://adsabs.harvard.edu/abs/2007JQS....22..101B

PDF file at:
http://tsun.sscc.ru/hiwg/PABL/Baillie_2007_JQS.pdf

Yours,

Paul H.

Meteorite Triggered Ancient New York Tsunami ???

Paul bristolia at yahoo.com
Fri Jan 9 14:54:43 EST 2009

Meteorite Triggered Ancient New York Tsunami? by Ker Than,
National Geographic News, December 31, 2008,

http://news.nationalgeographic.com/news/2008/12/081231-new-york-tsunami.html

New York City's natural hazards: Rats, roaches and
& tsunamis? by Jordan Lite, Scientific American,

http://www.sciam.com/blog/60-second-science/post.cfm?id=new-york-citys-natural-hazards-rats-2008-12-30

Cagen, K. T., D. Abbott, F. Nitsche, A. West, T. Bunch,
D. Breger, A. Slagle, and S. Carbotte, 2008, Evidence for
a Tsunamigenic Impact Event in the New York Metropolitan
Area Approximately 2300 B.P., Eos Trans. Aemrican Geophysical
Insitute, vol.89, no. 53, Fall Meet. Supplement, abstract
P31A-1381,

http://www.agu.org/cgi-bin/SFgate/SFgate?&listenv=table&multiple=1&range=1&directget=1&application=fm08&database=%2Fdata%2Fepubs%2Fwais%2Findexes%2Ffm08%2Ffm08&maxhits=200&=%22P31A-1381%22

or http://adsabs.harvard.edu/abs/2008AGUFM.P31A1381C

Yours,

Paul H.

PDF Files of Holocene Impact Working Group Publications

Paul bristolia at yahoo.com
Fri Jan 9 10:13:58 EST 2009

PDF files of Holocene Impact Working Group publications
can be found at:found at:

http://tsun.sscc.ru/hiwg/publ.htm

Home page

http://tsun.sscc.ru/hiwg/hiwg.htm

Yours,

Paul H.

Comet smashes triggered ancient famine ???

Paul bristolia at yahoo.com
Fri Jan 9 10:12:59 EST 2009

Comet smashes triggered ancient famine
January 7, 2009 by Ker Than
http://www.newscientist.com/article/mg20126882.900-comet-smashes-triggered-ancient-famine.html?DCMP=OTC-rss&nsref=online-news

Abbott, D. H., P. Biscaye, J. Cole-Dai, and D. Breger, 2008,
Magnetite and Silicate Spherules from the GISP2 Core at the 536 A.D. Horizon
American Geophysical Union, Fall Meeting 2008, abstract #PP41B-1454

http://www.agu.org/cgi-bin/SFgate/SFgate?&listenv=table&multiple=1&range=1&directget=1&application=fm08&database=%2Fdata%2Fepubs%2Fwais%2Findexes%2Ffm08%2Ffm08&maxhits=200&=%22PP41B-1454%22

and

http://adsabs.harvard.edu/abs/2008AGUFMPP41B1454A

Yours,

Paul H.

Inverted Paleochannels of Mars

Paul bristolia at yahoo.com
Thu Jan 8 10:03:04 EST 2009

PDF files of papers discussing inverted fluvial channels on Mars
and terrestrial analogs in Utah are available online. They are:

Chidsey, T. C., Jr., R. E. M. Williams, and D. E. Eby, 2008,
Ancient Exhumed River Channels of the Morrison and Cedar
Mtn Formations. Utah Geological Survey Notes. vol. 40,
no. 3, pp. 1-4.

http://geology.utah.gov/surveynotes/snt40-3.pdf

Williams, R. E. M., T. C. Chidsey, Jr., and D. E. Eby, 2007,
Exhumed Paleochannels in Central Utah–Analogs for Raised
Curvilinear Features on Mars. in G. C. Willis, M. D. Hylland,
D. L. Clark, and T. C. Chidsey, eds., Central Utah–Diverse
Geology of a Dynamic Landscape. Utah Geological
Association Publication no. 26. Salt Lake City, Utah.

http://www.psi.edu/reports/2007/williamspics/Williams07_UGA36.pdf

The Utah inverted paleochannels can be seen readily on
Google Earth. The coordinates for one prominent set of them is:

38°52'32.42"N, 110°16'15.38"W

Yours,

Paul H.

PDF file of Article on Gunlock Meteorite Available

Paul bristolia at yahoo.com
Tue Jan 6 14:16:50 EST 2009

The Utah Geological Survey has published an article about the
Gunlock Meteorite. It is:

Laine, M., 2008, The Gunlock Meteorite Finds a New Home at the
Utah Geological Survey. vol. 40, no. 2, pp. 9-10.

Its PDF file can be found at:

http://geology.utah.gov/surveynotes/snt40-2.pdf

http://geology.utah.gov/surveynotes/

http://media.bonnint.net/slc/470/47062/4706229.pdf

The "Glad you asked..." column is about "So you think
you have found a meteorite!" on page 8.

Yours,

Paul H.

Sedimentary Meteorites

Paul bristolia at yahoo.com
Fri Jan 2 01:41:10 EST 2009

Stone 6: artificial sedimentary meteorites in space.
Geophysical Research Abstracts,Vol. 10, EGU2008-A-04592,
2008SRef-ID: 1607-7962/gra/EGU2008-A-04592EGU General
Assembly 2008, PDF file at:

http://www.cosis.net/abstracts/EGU2008/04592/EGU2008-A-04592.pdf

STONE 6: artificial sedimentary meteorites in space.
Lunar and Planetary Science XXXIX (2008)

PDF file at: http://oro.open.ac.uk/12494/1/1538.pdf

Foucher, F., F. Westall, J.-M. Beny, F. Brandstatter, and
R. Demets, Can microfossils in a meteor survive atmospheric
entry. EPSC Abstracts. vol. 3, EPSC2008-A-00273.(European
Planetary Science Congress) PDF file at:

http://cosis.net/abstracts/EPSC2008/00273/EPSC2008-A-00273-1.pdf

Yours,

Paul H.

URLs for "Comet hits North America 13, 000 years ago" Science paper

Paul bristolia at yahoo.com
Thu Jan 1 23:31:48 EST 2009

In "LATimes- Comet hits North America 13, 000 years ago" at:
http://six.pairlist.net/pipermail/meteorite-list/2009-January/048575.html ,
Howard Wu wrote:

"E.P. Grondine is going to love this one

http://www.latimes.com/news/science/la-sci-extinction2-2009jan02,0,896970.story


>From the Los Angeles Times


Diamonds show comet struck North America, scientists
say The impact caused an ice age that killed some mammal
species and many humans 12,900 years ago, researchers
report. They say the discovery of tiny heat-formed
diamonds is proof of the catastrophe. By Thomas H. Maugh,
January 1, 2009"

Another article is "Six North American Sites Hold
12,900-year-old Nanodiamond-rich Soil", ScienceDaily
Jan. 1, 2009.

http://www.sciencedaily.com/releases/2009/01/090101172136.htm

The above articles refer to:

Kennett, D. J., J. P. Kennett, A. West, C. Mercer,
S. S. Que Hee, L. Bement, T. E. Bunch, M. Sellers,
and W. S. Wolbach, 2009, Nanodiamonds in the
Younger Dryas Boundary Sediment Layer. Science.
vol. 323. no. 5910, p. 94. DOI: 10.1126/science.1162819

http://www.sciencemag.org/cgi/content/abstract/323/5910/94

Commentary on this article can be found in:

Kerr, R. A., 2009, PLANETARY IMPACTS: Did the Mammoth
Slayer Leave a Diamond Calling Card? Science., vol. 323.
no. 5910, p. 26. DOI: 10.1126/science.323.5910.26

http://www.sciencemag.org/cgi/content/full/323/5910/26

Tomorrow, while at work I will download the PDF files
for the paper and article and have a look at them.

Best Regards,

Paul H

Siberian flood basalts and the end-Permian environmental crisis

Paul bristolia at yahoo.com
Mon Dec 29 00:58:40 EST 2008

In press in the "Earth and Planetary Science Letters" is:

Svensen, H., S. Planke, A. G. Polozov, N. Schmidbauer, F. Corfu,
Y. Y. Podladchikov, and B. Jamtveit, in press, Siberian gas
venting and the end-Permian environmental crisis. Earth and
Planetary Science Letters.

The PDF file for this paper can be found at:

http://folk.uio.no/yuripo/papers/svensen_epsl_09.pdf

They concluded that that heating of Tunguska Basin sediments by
the ascending magma of the Siberian Traps Large Igneous Province
was capable of playing a key role in end-Permian environmental
crisis. They argue that the cooking of organic-rich shales and
petroleum-bearing evaporites around sill intrusions produced
sufficient volumes of greenhouse gases and halocarbons to cause
warming and atmospheric ozone depletion on a global scale. They
estimated that the metamorphism of organic matter and petroleum
generated over 100,000 Gigatons of CO2 that were released through
enormous pipe structures associated with kilometre-sized craters.
They also argue from laboratory experiments that cooking of
petroleum-bearing rock salt at high temperatures by the magmas
generated huge quantities of methyl chloride and methyl bromide
that have resulted not only in global warming but also global ozone
depletion.

PDF files of ther papers of Dr Henrik Svensen can be found at:

http://folk.uio.no/hensven/publications.htm

The source of PDF file of related papers where noted in
"[meteorite-list] Online PDF files about Permian-Triassic
extinction" at;

http://six.pairlist.net/pipermail/meteorite-list/2008-December/048424.html

Note: I am only summarizing what the above paper states. As
result, this post reflect only the opinions of the authors
of the above paper and **not** my own opinions on this subject.
Thus, any disagreements should directed to the paper and it
authors and **not** me. Furthermore I feel no obligation to
defend their conclusions as I am still in the process of
evaluating the arguments made in this paper.

Yours,

Paul H.

Meteorite impacts Scotland

Paul bristolia at yahoo.com
Sat Dec 27 22:47:36 EST 2008

"http://news.bbc.co.uk/1/hi/scotland/highlands_and_islands/7795381.stm
(OK, it was a little while back :) )"

More details can be found at:

Microscopic meteorites show early life on Earth faced
rain of rocks Media Releases, Office of External Affairs,
University of Aberdeen, King's College, Aberdeen.

http://www.abdn.ac.uk/mediareleases/release.php?id=1643

"Microscopic meteorites found in Scotland have unveiled
major clues about a catastrophic event which dramatically
altered the Earth’s surface nearly 500 million years ago."

The paper discussed in the above articles is:

Parnall, J., 2009, Global mass wasting at continental
margins during Ordovician high meteorite influx. Nature
Geoscience. vol. 2, no. 1, pp. 57 - 61, Published
online: 14 December 2008 | doi:10.1038/ngeo386

http://www.nature.com/ngeo/journal/v2/n1/abs/ngeo386.html

http://www.nature.com/ngeo/journal/v2/n1/index.html

Yours,

Paul H.

Online PDF files about Permian-Triassic extinction

Paul bristolia at yahoo.com
Thu Dec 25 00:46:13 EST 2008

Dear Friends,

The PDF files for a number of papers about the Permian
- Triassic extinction can be downloaded from:

http://pangea.stanford.edu/research/paleobiology/publications.php

They include:

Payne, J.L. and Kump, L.R. 2007. Evidence for recurrent
Early Triassic massive volcanism from quantitative
interpretation of carbon isotope fluctuations. Earth
and Planetary Science Letters. vol. 256, pp. 264-277.

http://pangea.stanford.edu/~jlpayne/Payne%20and%20Kump%202007%20EPSL.pdf

Payne, J.L., Lehrmann, D.J., Follett, D., Seibel, M.,
Kump, L.R., Riccardi, A., Altiner, D., Sano, H., and
Wei, J. 2007. Erosional truncation of uppermost Permian
shallow-marine carbonates and implications for
Permian-Triassic boundary events. Geological Society
of America Bulletin. vol. 119, pp. 771-784.

http://pangea.stanford.edu/~jlpayne/Payne_et_al_2007_GSABull.pdf

Knoll, A.H., Bambach, R.K., Payne, J.L., Pruss, S.,
and Fischer, W. 2007. Paleophysiology and end-Permian
mass extinction. Earth and Planetary Science Letters.
vol. 256, pp. 295-313.

http://pangea.stanford.edu/~jlpayne/Knoll%20et%20al%202007%20EPSL%20Permian%20Triassic%20paleophysiology.pdf

Lehrmann, D. J., Payne, J. L., Pei, D., Enos, P.,
Ellwood, B., Orchard, M.J., Zhang, J., and Wei, J.
2007. Record of the end-Permian extinction and
Triassic biotic recovery in the Chongzuo-Pingguo
Platform, southern Nanpanjiang Basin, Guangxi,
south China. Palaeogeography, Palaeoclimatology,
Palaeoecology. vol. 252, pp. 200-217.

http://pangea.stanford.edu/~jlpayne/Lehrmann%20et%20al%202006%20Geology.pdf

Yours,

Paul H.