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View Full Version : Allan Hills 84001....Mars Attacks ...from Impacts



trinitree88
2017-Mar-15, 09:07 PM
Loved the general idiocy in the Sci-Fi spoof "Mars Attacks" many moons ago. Here's a legitimate rehash of the famous Allan Hills 840001 meteorite, using petrographic microscopy,cathodoluminescence microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy,micro-Raman spectroscopy, and an electron microprobe. Not a lot of arm-waving there.
For the novices, Martian meteorites are occasionally ejected from the surface of Mars by impacts, travel to Earth, enter our atmosphere, and are found. Analysis of the ratios of select isotopes in them,(particulary from entrained gases) identifies them as such. The Allan Hills meteorite has been subject to much scrutiny, and as the only sample we have of the oldest Martian crust (the Noachian crust), it is a valuable source of info about early Mars.
Analysis by teams of people over years indicate this rock was subjected to at least 2 and possibly three separate impact events, allowing the formation of two sets of fractures with different chemical composition of their carbonates. These in turn suggest info on the wetness and temperature around the impacts. Interesting, impressive geochemical assays. SEE:https://arxiv.org/abs/1703.04432 pete

Mars Attacks, see:http://images4.static-bluray.com/reviews/3224_1.jpg

01101001
2017-Mar-15, 10:45 PM
Link to source material might be useful.

Link to humorous image, not so much.

Squink
2017-Mar-16, 12:20 AM
Cathodoluminescence microscope (https://en.wikipedia.org/wiki/Cathodoluminescence_microscope)
This seems like something I need to have.

trinitree88
2017-Mar-16, 01:13 PM
Link to source material might be useful.

Link to humorous image, not so much.

01101001. Sorry about that. ... just updated the link...been off my feed for a few weeks. pete