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题名: Mineralogy and geochemistry of sediments in lake Bosten, Xinjing, West China
作者: Song S.-R.;Chen H.-F.;Li L.-J.;Liu Y.-J.;Lee C.-Y.;Lee T.-Q.;Wang W.-L.;Chen M.-T.
贡献者: NTOU:Institute of Applied Geosciences
日期: 2004
上传时间: 2011-10-20T08:17:35Z
出版者: 2004 Joint Geosciences Assembly Symposium
摘要: abstract:A core about 7 meters was raised from the Lake Bosten, Xinjing, west China for Holocene climate changes in central Asia. This paper reports the results of mineralogy and major and trace element geochemistry of sediments to study the variations of source provenance, weathering condition as well as significance of climate changes. The main mineral constituents of lake sediments are composed of quartz, calcite and clay minerals with authigenic aragonite and minor feldspar. Total carbonate (TC) contents vary positively with the authigenic aragonite. The characteristics of major elements of sediments are high CaO and K2O/Na2O, and low SiO2 contents. SiO2 vs. other major elements plots show the positive variation trends and well correlates, except the CaO. The rare earth element (REE) patterns are very similar to each other, but differences in concentrations. These results suggest that the sediments may be erosive from a less weathered high-K granite and carbonate strata. Based on the variations of mineral content and major element chemistry with depth, the sediments can be divided into three periods. They are the high fluctuations in the lower part, stable and lower carbonates in the middle and high CaO and aragonite in the upper part. It seems to suggest that the Lake Bosten has suffered a quick climate changes during 7000~2000 yrBP, stable and wet during 2000~750 trBP, and dry in the last 750 yrBP. This interpretations are also supported by the paleomagnetic and diatom data.
显示于类别:[應用地球科學研究所] 演講及研討會





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