Nd and Sr isotopic variations in Chinese eolian deposits during the past 8 Ma: Implications for provenance change

被引：131

作者：

Sun, JM ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China

来源：

EARTH AND PLANETARY SCIENCE LETTERS | 2005年 / 240卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Sm-Nd isotope; Rb-Sr isotope; eolian deposits; provenance; Loess Plateau;

D O I：

10.1016/j.epsl.2005.09.019

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：

A record of changes in Nd and Sr isotopic composition of the eolian deposits from the central Loess Plateau has been determined for the past 8 Ma. The isotopic records of the silicate fraction of the Quaternary and Tertiary eolian deposits allow interpreting the interplay between the Sr isotopic variations in the eolian deposits and the late Cenozoic tectonic and climatic changes. The results indicate that the temporal variations of Nd and Sr isotopes show remarkable changes around the beginning of the Quaternary. The lower values of the Nd-143/Nd-144 and the decreasing trend of the Sr-87/Sr-86 ratios after 2,58 Ma ago are attributed to the additions of relatively younger crust materials in response to the climatic cooling and the late Cenozoic uplift induced glacial grinding in the high orogenic belts in central Asia, In this context. the substantial changes in climate and tectonics have modified dust sources significantly, and the Quaternary loess forming processes are preferentially sampling relatively younger and high relief crust materials than that of the Tertiary Red Clay. (C) 2005 Elsevier B.V. All rights reserved.

引用

页码：454 / 466

页数：13

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