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学科主题: 地球科学::地质学
题名: Eolian dust forcing of river chemistry on the northeastern Tibetan Plateau since 8 Ma
作者: Yang, YB (Yang, Yibo)1, 2, 3; Galy, A (Galy, Albert)3; Fang, XM (Fang, Xiaomin)1, 2; Yang, RS (Yang, Rongsheng)1; Zhang, WL (Zhang, Weilin)1, 2; Zan, JB (Zan, Jinbo)1, 2
通讯作者: Yang, YB ; Fang, XM
关键词: CHINESE LOESS PLATEAU ; LINXIA BASIN ; HIMALAYAN RIVERS ; NORTHERN CHINA ; CARBONATE ; PROVENANCE ; SILICATE ; DEPOSITS ; UPLIFT ; ND
刊名: EARTH AND PLANETARY SCIENCE LETTERS
发表日期: 2017
DOI: 10.1016/j.epsl.2017.02.009
卷: 464, 期:0, 页:200-210
收录类别: SCI
合作性质: 国际
文章类型: Article
类目[WOS]: Geochemistry & Geophysics ; Geochemistry & Geophysics
研究领域[WOS]: Geochemistry & Geophysics
英文摘要: Eolian dust is one of the most important factors controlling fluvial hydrological evolution in modern arid and semi-arid central Asia. Here, we present the bulk carbonate Ca-Mg-Sr concentrations and Sr isotopic compositions recorded in water soluble salts, carbonate and silicate fractions, as well as the Nd isotopic compositions in the silicate fraction of a Late Miocene (12.2-5.1Ma) fluvial sequence exhibiting paleosol development, in the Linxia Basin on the northeastern Tibetan Plateau (TP). Bulk carbonate Mg-Sr systematics show a distinct pattern in log-log plots of Mg/Ca versuslog Sr/Ca ratios, and clearly higher 87Sr/86Sr ratios since similar to 8Ma. These findings cannot be adequately explained by the mechanism of prior calcite precipitation (PCP)-this latter process results in a positive correlation between the Mg/Ca and Sr/Ca ratios in authigenic calcite, evident in the fixed gradient in their log-log plots and has been isolated as being the major factor controlling carbonate Mg-Sr systematics before 8 Ma. Nor can these findings be explained by other mechanisms related to the catchment's provenance/sedimentation. The dramatic changes in carbonate Sr contents, Sr isotopes, and Sr/Mg ratios since similar to 8Ma may therefore be inferred to have been triggered by significant inputs of eolian dust viathe dissolution of dust carbonates and evaporites in the paleowaters where fluvial and paleosol carbonates precipitated. This process of eolian dust input can be reliably illustrated using a binary mixing model corresponding to a series of varying PCP fluxes (identical to processes affecting the area before 8Ma) combined with a constant eolian influx calculated from the co-variations between Mg/Ca, Sr/Ca and Sr isotopic ratios. Eolian dust also leaves a fingerprint in the carbonate and silicate minerals of bulk sediments, as revealed respectively by their Sr and Nd isotopic compositions. Eolian dust compositions for the similar to 8-5Ma on the northeastern TP can thus be taken to be characterized by a epsilon Nd value <=-10.5for the silicate fraction, and by a 87Sr/86Sr value >= 0.7115 for the labile faction (carbonates and evaporites). Eolian dust is now recognized to have made a significant impact on the hydrological evolution of arid and semi-arid northern China as far back as similar to 8Ma, suggesting an enhanced regime of dust activity and regional aridification in central Asia at that time. (C) 2017 Elsevier B.V. All rights reserved.
语种: 英语
WOS记录号: WOS:000395923500019
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.itpcas.ac.cn/handle/131C11/8260
Appears in Collections:图书馆_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China.
2.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100085, Peoples R China.
3.Univ Lorraine, Ctr Rech Petrograph & Geochim, CNRS, UMR7358, F-54500 Vandoeuvre Les Nancy, France.

Recommended Citation:
Yang, YB ,Galy, A ,Fang, XM ,et al. Eolian dust forcing of river chemistry on the northeastern Tibetan Plateau since 8 Ma[J]. EARTH AND PLANETARY SCIENCE LETTERS,2017,464(0):200-210.
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