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Evidence suggests ancient impact crater buried under Bolaven volcanic field
Phys.org ^ | January 3, 2020 | Bob Yirka

Posted on 01/04/2020 10:16:56 PM PST by SunkenCiv

A team of researchers with members from Singapore, the U.S., Thailand and Laos has concluded that the impact point of a meteorite that struck the Earth approximately 790,000 years ago lies buried beneath a volcanic field in southern Laos. In their paper published in Proceedings of the National Academy of Sciences, the group outlines four lines of evidence that point to the Bolaven volcanic field as the likely site of the meteorite strike.

Prior research has shown that approximately 790,000 years ago, a large meteorite (the largest known young meteorite impact) struck Earth in the Eastern Hemisphere. So great was the impact that debris was strewn across a tenth of the entire planet's surface. Scientists know about the impact because of bits of glassy clasts known as tektites have been found in places like Antarctica, Australia and Southeast Asia... the researchers have found evidence that suggests the reason the crater has not been found is that it is hidden beneath a volcanic field -- and they provide four lines of evidence to back up their claim.

...the geochemistry of the tektites in the vicinity of the Bolaven volcanic field -- the researchers claim it implies the presence of basalts at the impact site... geologic mapping and dating of basaltic lavas that existed before and after the time of the impact, which showed a change occurred around the time of the impact... gravity measurements the team took at the Bolaven volcanic field -- they report an anomaly that suggests the presence of a 13- to 17-kilometer crater... an outcrop of crudely layered sandstone and mudstone boulders 10 to 20 kilometers from the Bolaven volcanic field, which appear to have been thrown there by the force of the meteorite striking the ground.

(Excerpt) Read more at phys.org ...


TOPICS: Astronomy; Science
KEYWORDS: antarctica; australia; bobyirka; bolavenvolcanicfield; catastrophism; khoratplateau; laos; tektites; thailand; volcano
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The Bolaven Plateau volcanic field likely buries the impact crater that produced the tektites of the Australasian strewn field. It is the only adequately large and thick postimpact deposit on the Khorat Plateau, the largest region of plausible target rocks. It is also the only thick, postimpact deposit within the inner Muong Nong strewn field, the region containing exclusively nonaerodynamically shaped Muong-Nong-type tektites (circumscribed by the blue ellipse). Tektite find locations data from ref. 52 and this study. Basalt fields adapted with permission of ref. 53 and ref. 54; permission conveyed through Copyright Clearance Center, Inc. Outline of the Khorat Plateau data from ref. 55. Inset, finds of Australasian tektites and microtektites data from ref. 56 (white dots) define an asymmetric strewn field (blue). Credit: Proceedings of the National Academy of Sciences

Credit: Proceedings of the National Academy of Sciences

1 posted on 01/04/2020 10:16:56 PM PST by SunkenCiv
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To: 75thOVI; Abathar; agrace; aimhigh; Alice in Wonderland; AnalogReigns; AndrewC; aragorn; ...



2 posted on 01/04/2020 10:17:19 PM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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To: SunkenCiv

That’s really not that long ago...in the 4 billion years scheme of things.


3 posted on 01/04/2020 10:19:23 PM PST by dp0622 (Radicals, racists Don't point fingers at me I'm a small town white boy Just tryin' to make ends meet)
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To: SunkenCiv

Whoever was living there had a really bad day. Twice.


4 posted on 01/04/2020 10:21:36 PM PST by Redcitizen (Tagline not secure.)
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To: SunkenCiv

Interesting


5 posted on 01/04/2020 10:26:47 PM PST by BenLurkin (The above is not a statement of fact. It is either opinion or satire. Or both.)
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To: Redcitizen; dp0622; BenLurkin
It was a great big owie.

6 posted on 01/04/2020 10:36:51 PM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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sidebar:

Meteorite impact caused the highest temperature ever recorded on Earth’s surface
by Bob Yirka , Phys.org
SEPTEMBER 18, 2017 REPORT
https://phys.org/news/2017-09-meteorite-impact-highest-temperature-earth.html
https://scx2.b-cdn.net/gfx/news/hires/2017/earth.jpg
Credit: CC0 Public Domain


7 posted on 01/04/2020 10:38:18 PM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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To: SunkenCiv

John Kerry says it’s seared, seared into his brain.


8 posted on 01/04/2020 10:39:08 PM PST by Larry Lucido
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To: dp0622

I believe that most of the lower half of the state of Florida, mostly in the area of the Everglades is the remains of an ancient impact crater.


9 posted on 01/04/2020 10:40:24 PM PST by jmacusa ("If wisdom is not the Lord, what is wisdom?)
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To: Larry Lucido

Seared you say? If John Kerry says it seared I guess it’s seared. Seared I’m sure.


10 posted on 01/04/2020 10:41:26 PM PST by jmacusa ("If wisdom is not the Lord, what is wisdom?)
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To: jmacusa

Wow. Never knew that.


11 posted on 01/04/2020 10:41:59 PM PST by dp0622 (Radicals, racists Don't point fingers at me I'm a small town white boy Just tryin' to make ends meet)
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To: SunkenCiv

interesting, shows just how often Earth gets hit by something or other. Thanks SunkenCiv.


12 posted on 01/04/2020 10:42:58 PM PST by txnativegop (The political left, Mankinds intellectual and political hemlock)
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To: dp0622

I remember some years ago, think it was on The Discovery channel either a separate meteorite hit that area after the massive meteorite that hit the present day Yucatan Peninsula or a chunk of that meteorite hit what is now the present Everglades are. I’m not an expert but it would seem to me to explain why there are often so many issues with sinkholes in the Everglades.


13 posted on 01/04/2020 10:47:36 PM PST by jmacusa ("If wisdom is not the Lord, what is wisdom?)
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To: jmacusa

That would make sense.


14 posted on 01/04/2020 10:48:15 PM PST by dp0622 (Radicals, racists Don't point fingers at me I'm a small town white boy Just tryin' to make ends meet)
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To: jmacusa

Did he mention he was in Cambodia?


15 posted on 01/04/2020 10:54:18 PM PST by Larry Lucido
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To: Larry Lucido
Farfetched, since he has none. :^)

16 posted on 01/04/2020 11:12:49 PM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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To: txnativegop
It's an interesting kaboom, and was formerly unfamiliar to me -- "debris was strewn across a tenth of the entire planet's surface".

17 posted on 01/04/2020 11:13:41 PM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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To: SunkenCiv

You mean it *wasn’t* Soleimani?


18 posted on 01/04/2020 11:48:47 PM PST by grey_whiskers (The opinions are solely those of the author and are subject to change with out notice.)
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To: grey_whiskers
Parts of him flew, just not fast enough to cover 1/10 the Earth's surface. :^)

19 posted on 01/04/2020 11:56:41 PM PST by SunkenCiv (Imagine an imaginary menagerie manager imagining managing an imaginary menagerie.)
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To: Larry Lucido
John Kerry says it’s seared, seared into his brain. <<

along with the rice in his ass when he threw the grenade into the rice cache..,

20 posted on 01/05/2020 12:08:27 AM PST by M-cubed
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