Climate induced temporal change in Sr-Nd isotope ratios in the valley-fill deposits of the Ganga river

被引:7
作者
Agrawal, Shailesh [1 ,2 ]
Sanyal, Prasanta [3 ]
Balakrishnan, Srinivasan [4 ]
Dash, Jitendra K. [4 ]
机构
[1] Birbal Sahni Inst Paleobot, Lucknow 226007, Uttar Pradesh, India
[2] Indian Inst Technol, Dept Geol & Geophys, Kharagpur 721302, W Bengal, India
[3] Indian Inst Sci Educ & Res, Dept Earth Sci, Kolkata 741252, Nadia, India
[4] Pondicherry Univ, Dept Earth Sci, Pondicherry 605014, India
关键词
Ganga Plain; Sr and Nd isotope ratio; Peninsular India; Himalaya; plains-fed river; EROSION DISTRIBUTION; SEDIMENT PROVENANCE; SR-87/SR-86; RECORD; BURMAN RANGES; HIMALAYA; STRONTIUM; BASIN; SILICATE; SYSTEM; FLUXES;
D O I
10.2343/geochemj.2.0321
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
The Sr-87/Sr-86 values in carbonate nodules and Sr-87/Sr-86 and epsilon Nd values in silicate samples from the valley-fill deposits of the Ganga river have been used to ascertain temporal changes in sediment provenance during the last glacial interglacial cycle. To understand the changes, a 25 m long core named as the Firozpur core has been sampled for carbonate nodules and sediments. The Sr-87/Sr-86 values in carbonate nodules (0.71846 to 0.71965) of the Firozpur core are significantly more radiogenic during Last Glacial Maxima (LGM) and pre-LGM time and suggest that the Ganga river is characterized by higher Sr-87/Sr-86 values compared to global average river water (0.7119) at all times in the past and present. Sr and Nd isotopic data in silicate vary significantly with depth, 0.73580 to 0.77894 and -14.3 to -17.6, respectively and falling within the range of silicate rocks of the Higher Himalaya (HH) and the Lesser Himalaya (LH), the two major sediment sources to the Ganga river. The strong anti-correlation between Sr-87/Sr-86 and eNd again confirm this hypothesis. Together with the delta O-18 values and Sr-87/Sr-86 and eNd values of the Firozpur core suggest low precipitation over the HH during LGM caused less sediments supply from it and enhanced sediments supply from the LH. It shows significant influence of climate on erosion in the Himalaya.
引用
收藏
页码:451 / 462
页数:12
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