Controls of Stratigraphic Architecture on Along Strike Cooling Age Patterns

Cooling related to moving rocks over an ~8.5 km vertically thick ramp in the Main Himalayan thrust (MHT) produced 0.8–2 Ma zircon (U–Th)/He (ZHe) and apatite fission track (AFT) ages from the Main Central thrust to 40 km south in central Nepal. The ramp size is controlled by thicker Proterozoic stra...

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Published in:Terra nova (Oxford, England) England), 2021-04, Vol.33 (2), p.129-136
Main Authors: Robinson, Delores M., Khanal, Subodha, Olree, Elizabeth, Bhattacharya, Gourab, Mandal, Subhadip
Format: Article
Language:English
Subjects:
Apatite
Cooling
Himalaya
Lesser Himalaya
Main Himalayan thrust
Precambrian
ramps
Stratigraphy
thermochonology
Uplift
Zircon
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creator Robinson, Delores M.
Khanal, Subodha
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Mandal, Subhadip
description Cooling related to moving rocks over an ~8.5 km vertically thick ramp in the Main Himalayan thrust (MHT) produced 0.8–2 Ma zircon (U–Th)/He (ZHe) and apatite fission track (AFT) ages from the Main Central thrust to 40 km south in central Nepal. The ramp size is controlled by thicker Proterozoic stratigraphy. ZHe ages in NW India and eastern Bhutan over a similar 40 km wide swath are 1.4–12 Ma. In addition, the ZHe ages are consistently 2–5 million years older than the AFT ages. We argue that the MHT ramps are smaller because of thinner Proterozoic stratigraphy, with two vertically thick ramps of 2.5 km each in eastern Bhutan and one vertically thick ramp of ~5 km in NW India. Thus, the original stratigraphy and associated weaker décollement horizons control location and size of active MHT ramps, resulting vertical uplift, and along strike pattern of cooling ages.
doi_str_mv 10.1111/ter.12498
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ispartof Terra nova (Oxford, England), 2021-04, Vol.33 (2), p.129-136
issn 0954-4879
1365-3121
language eng
recordid cdi_proquest_journals_2500367949
source Wiley
subjects Apatite
Cooling
Himalaya
Lesser Himalaya
Main Himalayan thrust
Precambrian
ramps
Stratigraphy
thermochonology
Uplift
Zircon
title Controls of Stratigraphic Architecture on Along Strike Cooling Age Patterns
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