Weathering in the Himalaya, an East- West comparison:indications from major elements and clay mineralogy

Vogeli, Natalie and van der Beek, Peter and Huyghe, Pascale and Najman, Yanina Manya Rachel (2017) Weathering in the Himalaya, an East- West comparison:indications from major elements and clay mineralogy. Journal of Geology, 125 (5). pp. 515-529. ISSN 0022-1376

[img]
Preview
PDF (Comp paper JoG revision submit)
Comp_paper_JoG_revision_submit.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.

Download (571kB)
[img]
Preview
PDF (Figures Comp paper all)
Figures_Comp_paper_all.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.

Download (4MB)

Abstract

Studying past weathering regimes is important for a better understanding of the influence of climate on weathering, erosion, and runoff. The Himalayan foreland basin contains a record of tectonics and paleoclimate since Miocene times. Spanning the entire mountain range, the Mio-Pliocene detrital Siwalik Group allows studies to directly compare the western and eastern Himalaya within similar sedimentary settings. In this study, we use major elements and clay mineralogy to reconstruct the weathering regime along strike since Miocene times. We studied previously dated Dharamsala (pre-Siwalik) and Siwalik sections in the western (Joginder Nagar, Jawalamukhi, and Haripur Kolar) and eastern (Kameng) Himalaya in order to constrain variations in weathering regimes along strike. The compilation of the three sections in the west makes for one of the longest continuous sedimentary records in the Himalaya, spanning over 20 My. The K/Al ratio is used as a reliable weathering proxy and shows a trend toward more intense weathering over time in both the west and the east, but with sediments in the western Himalaya generally more weathered than those in the east, despite higher precipitation in the east. Clay minerals and major elements indicate similar lateral variations in weathering. More intense weathering in the west is linked to a more seasonal climate, permitting weathering of sediments during the dry season, whereas higher runoff in the east leads to more rapid erosion and sediment transport, inhibiting extensive weathering.

Item Type:
Journal Article
Journal or Publication Title:
Journal of Geology
Additional Information:
© 2017 by The University of Chicago. All rights reserved.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1907
Subjects:
ID Code:
86300
Deposited By:
Deposited On:
13 May 2017 02:36
Refereed?:
Yes
Published?:
Published
Last Modified:
24 Nov 2020 05:15