Geochemical indicators of paleoclimate changes in sediments of Lake Baikal

被引：0

作者：

Goldberg, EL

Fedorin, MA

Grachev, MA

Zolotarev, KV

Khlystov, OM

机构：

[1] Russian Acad Sci, Siberian Div, Inst Limnol, Irkutsk 664033, Russia

[2] Russian Acad Sci, Siberian Div, Inst Phys Nucl, Novosibirsk 630090, Russia

来源：

GEOLOGIYA I GEOFIZIKA | 2001年 / 42卷 / 1-2期

关键词：

Pleistocene; bottom sediments; paleoclimate; biogenic and terrigenous paleoindicators; tracer elements; glaciation; Lake Baikal;

D O I：

暂无

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

An X-ray fluorescent analysis with synchrotron radiation (SR-XFA) and neutron-activation analysis (INAA) were used to interpret high-resolution geochemical records of paleoclimate signals in bottom sediments of Lake Baikal. Concentrations of some elements and their ratios respond to climate change and thus mark glacial and interglacial stages. Sr/Ba, Sr/Rb, Sr/Cs, Sr/Ti, U/Th, Zn/Nb, U, Mo, Br, Eu, Tb, and Yb show positive correlations with the content of biogenic silica (Si-bi), which is high in the periods of interglacials and low in those of glacials, whereas Ba, Rb, Cs, Th, La, Ce, Nd, and La (Ce, Ba)/Yb (Y, Zr) anticorrelate with Sibi and increased concentrations of these elements mark glacial stages. The two series of geochemical signals, along with biogenic silica, reflect climate fluctuations from glacials to interglacials through the past 780 ka.

引用

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页码：76 / 86

页数：11

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