Dear Jayanta,
Pseudotachylite vein thickness depends a lot on the origin of the frictional
melt.
If it is impact related, then thicknesses of up to 10 m have been reported. A
good example of that is the Vredefort impact structure in South Africa.
If it is fault related, then thicknesses are typically in the order of a few
centimeters. However zones of melt gathering may form locally like for
example in the Santa Rossa Mts, California. This kind is commonly associated
with other fault rocks such as ultramylonite, ultracataclasite.
I hope this helps,
Eric
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Dear All,
Please let me know what is the optimum size reported for any
pseudotachylite vein anywhere. We are getting a ~10m wide vein composed of
pure glassy rock (dark grey coloured, no crystals) for over a km within
granitoids of Achaean affinity in parts of Bundelkhand Granitoid Complex,
Central India.
Your feedbacks on this would be greatly appreciated.
With best wishes and kindest regards,
Sincerely yours,
Jayanta.
(Dr. Jayanta Kumar Pati)
Reader in Geology
Department of Earth and Planetary Sciences
Nehru Science Centre
University of Allahabad
Allahabad-211 002, INDIA.
Phone: 91-0532-2506993 (Res.)
E-mail: [log in to unmask]
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