Erosional history of the Himalayan and Burman ranges during the last two glacial-interglacial cycles

Details Erosional history of the Himalayan and Burman ranges during the last two glacial-interglacial cycles Erosional history of the Himalayan and Burman ranges during the last two glacial-interglacial cycles

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999e%26psl.171..647c&link_type=abstract

Earth and Planetary Science Letters, Volume 171, Issue 4, p. 647-660.

Other

19

Scientific paper

The results of a clay mineralogy study combined with major element geochemistry, strontium, neodymium and oxygen isotopes, and 14C AMS stratigraphy are reported for deep-sea gravity cores located in the Bay of Bengal (MD77-180) and the Andaman Sea (MD77-169). ɛNd(0) and 87Sr/86Sr from Holocene and last glacial maximum (LGM) sediments of fifteen other cores have also been investigated to identify sediment sources and to estimate oceanic sedimentary transport. The data show the contribution of three sources: (1) Ganges/Brahmaputra rivers; (2) Irrawaddy River; and (3) sediment derived from the western part of the Indo-Burman ranges. The dispersion of the detrital material issuing from these sources has been constrained by the geographic distribution of Nd and Sr isotopic ratios. The LGM sediments are characterized by a significant increase of 87Sr/86Sr, small changes in ɛNd(0), and a general decrease of smectite/(illite + chlorite), which together imply a decrease in weathering intensity. The increased 87Sr/86Sr are attributed to a decrease in chemical weathering, which should release preferentially 87Sr during weathering processes. In the Andaman Sea sediments, smectite/(illite + chlorite) and kaolinite/quartz ratios combined with a chemical index of alteration (CIA*) indicate that the weathering intensity of the Irrawaddy River basin is mainly controlled by the summer monsoon rainfall intensity. The wet summer monsoons increase vegetation cover in the plains and favor soil development by the production of pedogenic clays (smectite and kaolinite).

Affiliated with

Also associated with

No associations

Rating

Erosional history of the Himalayan and Burman ranges during the last two glacial-interglacial cycles does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Erosional history of the Himalayan and Burman ranges during the last two glacial-interglacial cycles, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Erosional history of the Himalayan and Burman ranges during the last two glacial-interglacial cycles will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1558215