Questions tagged [meteorite]

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33
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3answers
13k views

Why is Earth's age given by dating meteorites rather than its own rocks?

Reading a course on Precambrian, I read that: Earth Age (around 4.5 billion years) is dated thanks to the meteorites hitting Earth during its formation rather than the inner materials composing the ...
16
votes
1answer
1k views

What temperature do small meteorites have on impact

A question which has haunted me for years. What temperature do small meteorites (which don't evaporate on impact) have if you find them immediately after they hit the surface. I understand that the ...
16
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1answer
1k views

Impact craters under water

What would be the resulting impact crater of a meteorite hitting bodies of water on Earth? Let's take for example the impactor that resulted in Meteor Crater, Arizona. What would the impact look like ...
15
votes
1answer
2k views

Can impact events cause widespread volcanic activity on the other side of the planet?

The currently accepted theory for P-T mass extinction is environmental change triggered by the Siberian Traps volcanic activity. A paper(1) suggests that the Siberian Traps were caused by a hotspot ...
12
votes
2answers
891 views

Have meteorites been found in the oldest sedimentary rocks?

Dropstones sometimes occur in sedimentary rocks. These are foreign rocks and boulders that happened to "drop" into a sediment and were fossilised when the sediment was lithified. (source: Michael C. ...
11
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2answers
157 views

Water on Mars and Earth

If water on Earth came from meteorites, why doesn't Mars have substantial water? What made it more highly probable on Earth than on Mars?
11
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1answer
271 views

Regarding the theory of the origin of water on Earth through meteorites, why wouldn't the water evaporate on impact?

Water on earth has been theorized to have come through comets trapped inside crystals. But why wouldn't that water evaporate on impact, and wouldn't the atmosphere at that time allow the vapours to ...
10
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5answers
23k views

Which theory is stronger, that iron came from outside or was formed within earth?

Where is the current body of science learning towards, that iron came from meteor or it was somehow formed on earth?
10
votes
1answer
216 views

'Late Veneer' on other planets

Is there any evidence of external material source events, like the 'Late Veneer' on other planets? Or is this theory specific just for Earth? Note, that this question may be related to How and why ...
10
votes
1answer
682 views

How deep was the Vredefort Crater when it happened?

The Vredefort Crater is one of the biggest known impact craters on earth. How deep would it have been, relative to the original ground height, immediately after the dust settled, and before any ...
8
votes
4answers
824 views

Are craters on Earth covered by vegetation?

When you look at other planets and moons in our solar system most of them have lots of craters. If Earth had no vegetation and water would it also look like this image of Charon? Image Credit: NASA/...
8
votes
1answer
148 views

Could diamonds be formed from coal?

Diamonds are predominately formed in cratons and brought to the surface in kimberlite pipes. However, it seems theoretically possible that diamonds could form at either subduction zones or from ...
8
votes
1answer
776 views

What is the most powerful natural catastrophic event on record?

Natural catastrophic events such as hurricanes, earthquakes, volcanic eruptions and meteor impacts releases vast amount of energy. What is the most powerful single event of such nature ever recorded ...
7
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1answer
90 views

Signatures of acid rain at KT boundary

I read in Walter Alvarez' book T. Rex and the Crater of Doom that the Earth's collision with the large meteor leading to the K-T extinction catalyzed the reaction of atmospheric oxygen and nitrogen ...
6
votes
1answer
389 views

Can a cosmic impact break Earth's crust in large area exposing the magma ocean?

Can a cosmic impact event break the Earth's surface in such a way so it expose liquid magma over large areas with solid rocks floating in it as "icebergs"? I wonder, will such magma ocean experience ...
6
votes
2answers
143 views

Please help me Identify this rock

I am not an avid collector but I found a rock that was really out of place and have had it for 40 years now. So...basically, it's about time to figure this out. I found it in a field on the east side ...
6
votes
2answers
1k views

How was Nastapoka arc formed?

As wikipedia says, the Nastapoka arc is a geological feature located on the southeastern shore of Hudson Bay, Canada. (Other description with picture at the Royal Astronomical Society of Canada) No ...
6
votes
1answer
833 views

Basalt, slag or meteorite?

I found this rock on the edges of a known Drumlin in North East England. It looks to be a fragment from a larger piece. It attracts a magnet strongly, it weighs 150 grams. It has vesicular holes (on ...
6
votes
0answers
79 views

Does a registry for fallen meteors exist?

Is there any kind of like an officially monitored list of falling asteroids, meteors, etc and objects entering earth's atmosphere?
4
votes
1answer
5k views

Is the “Kartenhoff” meteorite real?

In the Bond movie "Spectre", there is a scene with a large meteorite on a stand: Is this meteorite real, or is it based on a real meteorite? Are there actually any meteorites this large and perfect?
4
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3answers
749 views

Is there any new water formed on, or brought to, Earth?

I've found 2 sources stating that there is new water being formed on Earth. The first site states that it is coming from hydrothermal vents in the sea floor. The second site is basically saying that ...
4
votes
1answer
132 views

Is it possible to estimate the size of a meteorite from its remains?

I live near this ophiolite (Sasso di San Zanobi, Firenzuola) and they used to say it is a meteorite. There is no evidence of a crater but let's pretend it is the remain of a meteorite: how big would ...
3
votes
4answers
931 views

Importance of meteorite impact craters in geology?

What is the economic importance of large meteorite impact craters with a diameter over 100 m? Can they form diamonds or produce other economic deposits?
3
votes
1answer
4k views

What happens if a magnitude 13 earthquake occurs?

What would happen if a Richter magnitude 13 earthquake occurred? I read (at http://www.tulane.edu/~sanelson/Natural_Disasters/impacts.htm; about halfway down the page) that if a comet were to ever hit ...
3
votes
1answer
156 views

Anybody know what this may be? Is it some type of meteorite?

This rock is heavy and a magnet sticks to it. I don't know where it's from but I got it from somebody who bought a rock collection from an auction of a collector in MN. I grinded a spot on it and it ...
3
votes
1answer
154 views

Are the magnetic elements of meteorites that have struck Earth aligned with the magnetic field?

I was just pondering this question; do meteorites containing significant magnetic metal elements displace paleomagnetism the same way that magnetic striping on the ocean floor occurs? When the ...
3
votes
1answer
131 views

Ocean water coming from Mantle vs coming from meteorites

Posibly duplicate from Water on Mars and Earth I remember well a hydrology course where our teacher made some calculations of the total flux of water from Mantle ejections in Earth's history. He ...
3
votes
2answers
77 views

Iron-nickel phase in pallasite meteorites

I have recently been learning and researching about meteorite types and classification. Pallasites are mainly composed of a 'solid-solution' of olivine crystals and an iron-nickel alloy. My question ...
3
votes
0answers
77 views

Can anyone help me identify this rock found in Tulsa Oklahoma?

I was working in my front yard in Tulsa Oklahoma and ran over this rock with my lawnmower. It was logged in the ground enough I didn’t see it. It’s 2.5 inches in length. Black in color with what ...
2
votes
3answers
396 views

Why are there craters on the moon?

The Earth's moon is in synchronous rotation around Earth. The question: Why are there craters on the lit side of the moon and the dark and of which are not parallel with crater schemes on Earth?
2
votes
2answers
94 views

Meteor Explosion

I just read the article Meteor Explosion Over the Atlantic and it states that "Data released by NASA shows that the meteor released an energy equivalent to 12,000 tonnes (13,000 tons) of TNT, and it ...
2
votes
1answer
41 views

Sediment boundarys produced by largest meteors? Vredefort, Sudbury and Chicxulub

Chicxulub crater is the third largest crater on earth, which is said to have produced the KT boundary. What is the sediment layer produced by the 1st and 2nd largest craters? Also, there many ...
1
vote
1answer
99 views

Where are old Himawari weather satellite images available to the public? Is the 18-Dec-2018 Bearing Sea fireball still there?

In Scott Manley's new video 173 Kiloton Explosion Over Bering Sea Was Asteroid Breaking Up a bit after 01:30 he says The good news is that in these days of near-...
1
vote
1answer
983 views

Lava and Magma, Meteor and Meteorite--What's the Difference?

Some features of Earth (and beyond) have been bugging me for quite some time. When molten rock is beneath the surface, it's called "magma". Above the surface, it is called "lava". When a bolide is ...
1
vote
1answer
60 views

Need help identifying this rock that my grandfather found in or around Hot Springs, AR 75 years ago. PLEASE

I inherited this from my grandfather and all i know is that it's very heavy and it appears to have gold content. It's actually just been sitting around my house as a door prop the past 20 plus years. ...
1
vote
1answer
43 views

Haean, South Korea: is it of volcanic or meteor impact origin?

This is a layman's question. While looking for something I read in the news today, I stumbled upon the Haean region in South Korea (38°17'15.96"N, 128° 7'57.18"E) in Google Earth. To me it looks ...
1
vote
1answer
36 views

Should Imilac (meteorite) be singular or plural?

I first saw the term "Imilac meteorite" in this BBC News article. It shows a photograph of a meteorite on display along with the caption: The Imilac meteorite was found in the Atacama Desert in ...
1
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0answers
112 views

Can someone help me to identify this rock/mineral?

This is a small piece of a bigger chunk (about 9kgs). Someone told me it might be meteorite since its heavy for its size and has shiny particles. Others told me it might me an iron ore (magnetite). ...
1
vote
0answers
25 views

what are some limitations for using meteorites as evidence for the Earth's age?

I'm currently doing a question at the moment which is: Evaluate the usefulness and limitations of evidence provided by meteorites of Earth's age. I'm having trouble finding some limitations at the ...
1
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0answers
19 views

Mass contribution during the LHB

How much mass (either absolute or relative to the Earth) was [estimate to have been] added to the Earth during the Late Heavy Bombardment?
0
votes
1answer
114 views

Is this a meteorite?

Is this a possible meteorite? It's very heavy, magnetic, and the the shiny part shows where I sanded it with a file. Seems to be all metal on the inside.
0
votes
1answer
113 views

Identification request: Is this a meteorite with a shock vein? NW Montana

This rock was found in an area covered with approximately 200' of glacial till. The vein in the rock is partially oxidized. The rock is heavy; it shows some barely visible sparkle on its surface; the ...
0
votes
1answer
124 views

Does being in the air provide any protection from an asteroid?

How does radiation and shock waves from a radioactive asteroid or atomic explosion disperse throughout Earth's atmosphere? Are there specific areas on Earth that are less likely to receive the shock ...
-2
votes
1answer
339 views

Safest spots when an asteroid hits? [closed]

I am breaking this question and no longer making an effort in refining it with the exception of adding an associated link with the scenarios. I always wondered if a devastating asteroid was ...
-4
votes
3answers
214 views

Is this a meteor? It's very heavy for its size [closed]

Here it is. Hope this helps you best image I could take.