Impacts that produce K-feldspar-rich ejecta blankets correspond to mass extinctions 12APR2022

Impacts that produce K-feldspar-rich ejecta blankets correspond to mass extinctions

New open access paper about mass extinctions.

Pankhurst, M.J., Stevenson, C.J. and Coldwell, B.C., 2021. Meteorites
that produce K-feldspar-rich ejecta blankets correspond to mass extinctions.
Journal of the Geological Society. 179, jgs2021-055, 1 December 2021,
https://doi.org/10.1144/jgs2021-055
https://jgs.lyellcollection.org/content/179/3/jgs2021-055

Yours,

Paul H.

Have Martian Fossils Been Obliterated by Meteorite Impacts ?

Have Martian Fossils Been Obliterated by Meteorite Impacts ?

Have signs of Martian life been obliterated by meteorite
blasts? Daily Mail, August 9, 2016
http://www.dailymail.co.uk/sciencetech/article-3731884/Have-signs-Martian-life-obliterated-meteorite-blasts-Extreme-pressures-impact-wipe-organic-compounds-study-finds.html

Meteors might have wiped out evidence of life on
Mars in the places we’re looking by Josh Hrala
Science Alert, August 12, 2016
http://www.sciencealert.com/impact-craters-are-not-the-best-places-to-look-for-signs-of-life-on-mars-study-finds

Evidence of Martian life could be hard to find in
some meteorite blast sites, Imperial College London
http://www3.imperial.ac.uk/newsandeventspggrp/imperialcollege/newssummary/news_8-8-2016-12-31-10
http://www.sciencenewsline.com/news/2016080815080028.html
https://www.sciencedaily.com/releases/2016/08/160808091250.htm

The paper is:

Montgomery, W., G. D. Bromiley, and M. A. Sephton.
2016, The nature of organic records in impact
excavated rocks on Mars. Scientific Reports.
Vol. 6, no. 30947 DOI: 10.1038/srep30947
http://www.nature.com/articles/srep30947

Another recent article about meteorite impacts is:

How Often do Meteorites Hit the Earth?
Space.com by Samantha Mathewson, August 10, 2016
http://www.space.com/33695-thousands-meteorites-litter-earth-unpredictable-collisions.html

Yours,

Paul H.

Hadean Detrital Zircons – Impacts Not Plate Tectonics ?

Hadean Detrital Zircons – Impacts Not Plate Tectonics ?

Origin of Earth's oldest crystals
Trinity College Dublin, April 28, 2016
http://www.sciencealert.com/there-s-a-new-theory-about-how-the-earth-s-oldest-crystals-were-formed
http://www.livescience.com/54648-oldest-crystals-formed-in-asteroid-craters.html
http://phys.org/news/2016-05-oldest-crystals-world.html

Kenny, G. G., M. J. Whitehouse, and B. S. Kamber, 2016,
Differentiated impact melt sheets may be a potential
source of Hadean detrital zircon. Geology. First published
online April 28, 2016, doi: 10.1130/G37898.1
http://geology.gsapubs.org/content/early/2016/04/27/G37898.1

Kenny, G. G., M. J. Whitehouse, and B. S. Kamber, 2016,
Differentiated impact melt sheets may be a potential
Source of Hadean detrital zircon population. 47th
Lunar and Planetary Science Conference (2016).
http://www.hou.usra.edu/meetings/lpsc2016/pdf/2473.pdf

Yours,

Paul H.

Re: [meteorite-list] Changes In 14C and Impacts

Re: [meteorite-list] Changes In 14C and Impacts
Sterling K. Webb wrote:

>The village is actually named "Kitscoty."
>https://en.wikipedia.org/wiki/Kitscoty
>
>Kitscoty is named after a village in
>Kent (U.K.) with a famous stone
>megalithic structure, so while Googling
>for a Kitscoty Structure you have to
>distinguish which Kitscoty and what
>kind of structure is meant.
>http://albertacommunityprofiles.com/Profile/Kitscoty/2
>
>The "structure" referred to is a proposed
>"rebound" plateau of an impact south of
>Kitscoty, Alberta, Canada:
> http://www.meridianbooster.com/2009/03/18/did-a-massive-meteor-touch-down-here

I found two geological maps that cover the area of this alleged
structure. they are:

Kitscoty, Alberta, 1942, A Series, 1:253,440 scale, Geological Map
http://geogratis.gc.ca/api/en/nrcan-rncan/ess-sst/b59bdeb9-e941-5e83-a51b-2ab4c2f210c0.html
http://ftp2.cits.rncan.gc.ca/pub/geott/ess_pubs/106/106804/gscmap-a_673a_e_1942_mn01.pdf

Bedrock Geology of the Vermilion Area (NTS 73E), Map 570,
1:250,000 scale, Alberta Geological Survey
http://www.ags.gov.ab.ca/publications/map/PDF/Map_570.pdf
http://www.ags.gov.ab.ca/publications/abstracts/MAP_570.html
http://www.ags.gov.ab.ca/publications/pubs.aspx?pkey=vermilion

The Kitscoty, Alberta, 1942, A Series, geological Map shows
that this alleged feature is neither circular nor even a structure.
This map show only relatively flat lying Cretaceous sedimentary
strata that lacks any significant structure to it. There are a
couple of accurate geomorphic features. But neither of them
form a circle. It does not look like there is anything
significant about this "feature."

However, a nearby map that I came across shows what is
called the "Eagle Butte Astrobleme" just west of the Cypress
Hills, Alberta. The map is:

Bedrock Geology of the Foremost Area (NTS 72E),
Map 568, 1:250,000 scale, Alberta Geological Survey
http://www.ags.gov.ab.ca/publications/abstracts/MAP_568.html
http://www.ags.gov.ab.ca/publications/MAP/PDF/MAP_568.PDF

The Cypress Hills, Canada
https://en.wikipedia.org/wiki/Cypress_Hills_(Canada)

Yours,

Paul H.

New Paper about Cretaceous-Paleogene Extinctions

Paul Heinrich
Sat Mar 13 20:56:17 EST 2010

Dear Friends,

There is a new paper that proposes an interesting and novel
idea about the selectivity of the Cretaceous-Paleogene Extinctions.

It is:

Kikuchi, R., and M. Vanneste, 2010, A theoretical
exercise in the modeling of ground-level ozone resulting
from the K–T asteroid impact: Its possible link with the
extinction selectivity of terrestrial vertebrates.
Palaeogeography, Palaeoclimatology, Palaeoecology.
vol. 288, no. 1-4, pp.14–23.

http://dx.doi.org/10.1016/j.palaeo.2010.01.027

A somewhat unrelated and downloadable PDF file about
about "meteorites, impacts, and mass extinction" is:

Meteorites, Impacts, and Mass Extinction
by Prof. Stephen A. Nelson, Tulane University

http://www.tulane.edu/~sanelson/geol204/impacts.pdf
http://www.tulane.edu/~sanelson/geol204/index.html

Yours,

Paul H.

Impacts do not initiate volcanic eruptions

Tuesday, March 2, 2010 7:06 AM

Dear Friends,

I found a PDF reprint file of the below paper:

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; DOI: 10.1130/G19669.1

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

the comment and reply are also free as PDf files:

Glikson, A. Y., 2004, Impacts do not initiate volcanic eruptions:
Eruptions close to the crater: Comment and Reply: Comment.
Geology. vol. 32, no. 1 p. e48.

http://geology.gsapubs.org/content/32/1/e48.1.full.pdf+html

http://geology.gsapubs.org/content/32/1/e48.1.full

http://geology.gsapubs.org/content/32/1.toc

Ivanov, B. A., and H. J. Melosh, 2004, Impacts do not initiate
volcanic eruptions: Eruptions close to the crater: Comment
and Reply: REPLY. Geology. vol. 32, no. 1,
pp. e48-e49, doi:10.1130/0091-7613-32.1.e49

http://geology.gsapubs.org/content/32/1/e48.2.full

http://geology.gsapubs.org/content/32/1/e48.2.full.pdf+html

http://geology.gsapubs.org/content/32/1.toc

Yours,

Paul H.

Article About Firestone’s Hypotheses Published in “GSA Today”

Paul bristolia at yahoo.com
Mon Jan 7 17:02:13 EST 2008

An article, which includes comments about Firestone’s terminal
Pleistocene impact and other hypotheses has been published in
“GSA Today”. It is:

Pinter, N., and S.E. Ishman, 2008, Impacts, mega-tsunami, and
other extraordinary claims. GSA Today. vol. 18, no. 1, pp. 37-38.

This article can be downloaded from:

http://www.gsajournals.org/archive/1052-5173/18/1/pdf/i1052-5173-18-1-37.p

and

http://www.gsajournals.org/perlserv/?request=get-document&doi=10.1130%2FGSAT01801GW.1

linked at:

http://www.gsajournals.org/perlserv/?request=index-html&issn=1052-5173

Yours,

Paul H.

How to Discover Asteroid Impacts

Paul bristolia at yahoo.com
Wed Mar 15 17:06:20 EST 2006

How to discover asteroid impacts
The story of the discovery of two impact craters
By Emilio González, March 13, 2006
http://www.astroseti.org/impacts.php