刘璐, 谢远云, 迟云平, 康春国, 吴鹏, 魏振宇, 张月馨, 张曼. 地球化学组成对浑善达克沙地与科尔沁沙地风化和沉积循环特征及其物源的指示[J]. 海洋地质与第四纪地质, 2021, 41(4): 192-206. DOI: 10.16562/j.cnki.0256-1492.2020123102
引用本文: 刘璐, 谢远云, 迟云平, 康春国, 吴鹏, 魏振宇, 张月馨, 张曼. 地球化学组成对浑善达克沙地与科尔沁沙地风化和沉积循环特征及其物源的指示[J]. 海洋地质与第四纪地质, 2021, 41(4): 192-206. DOI: 10.16562/j.cnki.0256-1492.2020123102
LIU Lu, XIE Yuanyun, CHI Yunping, KANG Chunguo, WU Peng, WEI Zhenyu, ZHANG Yuexin, ZHANG Man. Geochemical compositions of the Onqin Daga Sand Land and Horqin Sand Land and their implications for weathering, sedimentation and provenance[J]. Marine Geology & Quaternary Geology, 2021, 41(4): 192-206. DOI: 10.16562/j.cnki.0256-1492.2020123102
Citation: LIU Lu, XIE Yuanyun, CHI Yunping, KANG Chunguo, WU Peng, WEI Zhenyu, ZHANG Yuexin, ZHANG Man. Geochemical compositions of the Onqin Daga Sand Land and Horqin Sand Land and their implications for weathering, sedimentation and provenance[J]. Marine Geology & Quaternary Geology, 2021, 41(4): 192-206. DOI: 10.16562/j.cnki.0256-1492.2020123102

地球化学组成对浑善达克沙地与科尔沁沙地风化和沉积循环特征及其物源的指示

Geochemical compositions of the Onqin Daga Sand Land and Horqin Sand Land and their implications for weathering, sedimentation and provenance

  • 摘要: 对浑善达克沙地与科尔沁沙地河流砂和风成砂的细颗粒组分(<10 μm和<63 μm)进行了地球化学元素(常量、微量和稀土元素)和Sr-Nd同位素分析,评估了浑善达克沙地与科尔沁沙地的化学风化、沉积再循环特征和物质源区,探讨了西拉沐沦河对两个沙地物质交换的贡献。浑善达克沙地与科尔沁沙地沉积物的地球化学分析(低的CIA值、PIA值和CIW值,高的WIP和ICV值,低的Zr/Sc比值以及A-CN-K和MFW图解等)表明这些沉积物处于化学风化初期阶段,成熟度低,仅经历了简单的沉积再循环过程。物源判别图解表明浑善达克沙地与科尔沁沙地的母岩以中酸性花岗岩石为主,并且具有一个混合源区,华北克拉通北部的燕山褶皱带和中亚造山带东部的大兴安岭山脉分别为它们提供了物质来源。此外,两个沙地的细颗粒物质(特别是<10 μm组分)在地球化学组成上具有很强的相似性,我们认为西拉沐沦河起到关键的桥梁作用,浑善达克沙地的细颗粒物质通过西拉沐沦河的搬运输送至科尔沁沙地,同时,地表盛行风的搬运也起到一定作用。

     

    Abstract: Sand and fine sand fractions (<10 μm and<63 μm) collected from the Onqin Daga Sand Land and the Horqin Sandy Land are analyzed for geochemical elements including major elements, trace elements, rare earth elements and Sr-Nd isotopes, in order to evaluate the chemical weathering, sedimentary characteristics, source areas, and the contribution of the Xar Moron River to the mass exchange between the two sands. The sediments are characterized by such features as low CIA, PIA and CIW values, high WIP and ICV values, low Zr/Sc ratio, A-CN-K and MFW diagram suggesting that the sediments are in the early stage of chemical weathering and low in maturity, and only experienced a simple process of sedimentary recycling. The provenance discrimination diagram shows that the parent rocks of Onqin Daga Sand and Horqin Sandy Land are dominated by intermediate-acid granitic rocks and have a mixed source from the western part of the Great Hinggan Mountains and the northern part of the North China Craton. In addition, the fine components, especially the component<10 μm, are very similar in geochemical composition for the two sandy areas, and it is believed that fine grain matters may have been transported from the Onqin Daga Sand Land to the Horqin Sand Land taking the Xar Moron River as a bridge. At the same time, atmospheric dust transport under prevailing winds may also play a certain role in fine sediment transportation.

     

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