Mineralogical, geochemical, and magnetic susceptibility variations in the loess-paleosol sequence from Pattan, Kashmir Valley, India record an enhanced Indian summer monsoon around 35 ka

被引:6
|
作者
Tauseef, Mohammad [1 ]
Ray, Esha [1 ]
Paul, Debajyoti [1 ]
Malik, Javed N. [1 ]
Ahmad, Ishtiaq [2 ]
机构
[1] Indian Inst Technol, Dept Earth Sci, Kanpur 208016, Uttar Pradesh, India
[2] Amar Singh Coll, Dept Geol, Srinagar 190008, J&k, India
关键词
Loess-paleosol geochemistry; Clay mineralogy; Magnetic susceptibility; Stable isotopes; Late pleistocene climate; Warm-humid phase; PLEISTOCENE CLIMATIC CHANGES; STABLE ISOTOPIC COMPOSITIONS; CHINESE LOESS; PALEOCLIMATIC SIGNIFICANCE; ORGANIC-MATTER; CLAY-MINERALS; GLACIAL CYCLE; CENTRAL-ASIA; SEDIMENTS; BASIN;
D O I
10.1016/j.quaint.2021.12.014
中图分类号
P9 [自然地理学];
学科分类号
0705 ; 070501 ;
摘要
We present multi-proxy records of bulk chemistry, clay mineralogy, stable isotope composition of soil organic matter (delta C-13(SOM)) and pedogenic carbonate (delta O-18(SC)), and mineral magnetic parameters of a loess-paleosol sequence from Kashmir Valley, India, to infer paleoclimate and paleovegetation during Late Pleistocene. C-14 AMS dating brackets the age of paleosols between 40 and 19.6 ka and suggests loess to be > 40 ka. Our study shows that a cold/dry climate prevailed at >40 ka (Late Pleistocene), during which the loess accumulation took place, and a warm/humid climate after that led to the development of soil units, with a prominent warm/humid phase around 35 ka. The range of Chemical Index of Alteration (72-78) and significant amounts of illite and chlorite in the section indicate moderate weathering. High kaolinite content, low chlorite, increased K/C, I/C, K/ (I + C) ratio, and presence of poorly crystalline and Al-rich illite by similar to 36 ka indicates increasing weathering intensity, likely due to an enhanced Indian Summer Monsoon (ISM). High magnetic susceptibility during 35-32 ka indicates enhanced pedogenesis due to a warm-humid climate. Paleotemperature estimates reveal a relatively warmer (by similar to 7 degrees C) climate during pedogenesis than that at >40 ka. delta C-13(SOM) values (-17 parts per thousand to -22.2 parts per thousand) suggest C-3 plants dominated the Kashmir Valley through the Late Pleistocene, however, a short period of enhanced summer monsoon at similar to 35 ka favored C-4 plant growth. The paleoclimate variability in the loess-paleosol sequence presented here agrees with the Guliya Ice Core delta O-18 record and high lake water levels in the Tibetan Plateau.
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页码:55 / 66
页数:12
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