Geomorphology of Gale Crater, Rock on! |
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Geomorphology of Gale Crater, Rock on! |
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#286
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 ![]() |
Thanks for that link. The conclusion that "the possibility that VRR members are distinguished primarily by diagenetic processes that did not follow strata boundaries" seems to be supported by Chemin results (link below). The difference between Grey Jura and Red Jura with significant akaganeite in Rock Hall would seem to indicate a localised concentration of chloride rich acidic fluid within the Jura member.
https://www.hou.usra.edu/meetings/lpsc2020/pdf/1601.pdf |
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#287
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2430 Joined: 30-January 13 From: Penang, Malaysia. Member No.: 6853 ![]() |
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#288
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 ![]() |
I don't feel there is any contradiction with the Gale crater sediment requiring millions to tens of millions of years to form in warm, humid conditions and some of the carbonates within that sediment possibly being formed in icy conditions. For the last 3 million years or so Earth has experience cyclical glaciation with shorter, warm and humid interglacials, initially on a 41 kyr cycle and then, for currently unknown reasons, switching to a 100kyr period. Even during interglacials there are significant temperature variations. It would probably be more surprising if there were no indications of temperature variability.
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#289
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 ![]() |
An interesting abstract from LPSC 2021 which includes possible flooding of Gale by breaches in the Northern crater rim.
https://www.hou.usra.edu/meetings/lpsc2021/pdf/1605.pdf |
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#290
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![]() Member ![]() ![]() ![]() Group: Members Posts: 684 Joined: 24-July 15 Member No.: 7619 ![]() |
An interesting abstract from LPSC 2021 which includes possible flooding of Gale by breaches in the Northern crater rim. https://www.hou.usra.edu/meetings/lpsc2021/pdf/1605.pdf Sort of amazing to realize "the eroded north rim of gale crater" could have been eroded by ocean waves. |
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#291
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![]() Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 2922 Joined: 14-February 06 From: Very close to the Pyrénées Mountains (France) Member No.: 682 ![]() |
Not sure it’s the right section…
From lake to river, open access paper from Gwénaël Caravaca : https://agupubs.onlinelibrary.wiley.com/doi...29/2021JE007093 -------------------- |
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#292
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Senior Member ![]() ![]() ![]() ![]() Group: Members Posts: 1045 Joined: 17-February 09 Member No.: 4605 ![]() |
Another possible indication of a northern ocean with implications for potential flooding of Gale crater.
https://www.psu.edu/news/research/story/tra...iscovered-mars/ |
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#293
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![]() Member ![]() ![]() ![]() Group: Members Posts: 715 Joined: 3-January 08 Member No.: 3995 ![]() |
Trying to make sense of the geologic context of the various units...
A major angular unconformity can be discerned by the truncation of the bench-forming sandstone (red). The Greenheugh Pediment sandstone (green) appears to be the basal unit of the overlying sequence: Unmarked: Closer: The above images were derived from Neville's Gigapan 'MSL 3485 -3520 MR' Map with possible field relations: There is a possibility the Greenheugh Sandstone instead outcrops along the feature marked as blue. |
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#294
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![]() Member ![]() ![]() ![]() Group: Members Posts: 715 Joined: 3-January 08 Member No.: 3995 ![]() |
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#295
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![]() Member ![]() ![]() ![]() Group: Members Posts: 715 Joined: 3-January 08 Member No.: 3995 ![]() |
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