Geochemistry and Mineral Characteristics of Quaternary Sediments from WuShan Region
|Keywords||Geochemistry Characteristics mineral rare earth elements(REE) Wu Shan|
The region of Yangtze River of Three Gorges is the most ideal place for studying Changjiang’s landform and environment evolution, and the sedimentary history of the sediments in this area closely related to the Three Gorges’ landform evolutionary history and the uplift of the Tibetan Plateau. According to the judgment to Quaternary sediments element geochemistry, minerals’ features and weathering degree on Wu Shan in this thesis so that fixes the Quaternary sediments’ features and origin. Element Geochemistry indicators can get the content of major elements of sediments, which are Fe2O3、SiO2、Al2O3、MgO、CaO、Na2O and K2O by mainly means of X-ray Fluorescence Spectrometer, and the content of the trace elements which are Ga、Sr、Ba、Cu、Zn、Co、Ni、Cr and V. When we compared the content of rare earth elements Which are La、Ce、Nd and Y with the major elements, trace elements and the average content of rare earth elements from our country’s typical aeolian sediments that are Luochuan loess, Luochuan paleosoil, Zhenjiang Xiashu soil, Xifeng red clay, Xuancheng eolian red clay and the top of the crust, we found that the chemical composition of the Quaternary sediments’major elements and trace elements in the region of Wang Tianping profile in Wushan had the better similarity with all above typical aeolian sediments, The rare earth elements correlation also had the similar variation with the loess, and the Quaternary sediments in Wushan has the characteristics of the Aeolian sediments.Utilizing X-ray diffraction analyzed the sediments of Wushan can know that the mineral assemblage of the Quaternary sediments from Wushan are quartz, mica and feldspar. And the average content of them are highly up to 94%. Furthermore, combined with the weathering, we can found out that the mineral’ features of the Quaternary sediments from Wushan are similar with the loess in the north of our country. Combined with the indicators of element geochemistry and mineral composition features, we can roughly know that the Quaternary sediments from Wushan maybe the Aeolian sediments, and the most part are from the drought region of the north in our country. Actually,it is the important environment changing vector for researching Three Gorges. But we did not collect samples for dating and its impact on the typical scanning electron microscopy of minerals experiment, which is also the shortage of these. Therefore, samples collected evidence of aeolian morphology requires further study.