| 塔里木盆地西部古盐岩同位素地球化学与成钾预测研究 |
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| 关键词:Tarim basin ancient salt rock isotope geochemistry sylvinite deposit |
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| Isotope Geochemistry of Ancient Salt Rocks and Prognosis of Sylvinite Deposits in Western Tarim Basin |
| From Late Cretaceous to Early Tertiary, the Pale-Mediterranean seawater repeatedly invaded into Shaqa subbasin and then pourde into Kuqa subbasin through the Awati strait. With the favorable tectonic and paleoenvironmental conditions, the basin deposited many sequences of theick evaporate beds, especially in its two largest subbasins: Kuqa in the north and Shaqa in the southwest .Therefore, the western Taim basin has been considered to be a favorable location in search for ancient sylvinite deposits. In order to indentify its marine or continental sedimentary facies and also the sedimentary stages, the authors selected the late stage evaporates of gypsum and salt minerals and measured the values of sulfur and chlorine isotopes. The results show that the sulfur isotopes of gypsum can be used to distinguish the sedimentary facies of marine or continent whereas chlorine isotopes of salt can be employed to detennie the sedimentary stage. It is thus concluded that Late Cretaceous salts deposited in Kashi depression of southwestem Tarim basin are close to the marine type, and the sedimentary stage is somwhat later than other regions. Therefore, Kashi depression should be regarded as a promising area in prospecting for sylvinite deposits. |
| TAN Hongbing,MA Haizhou,XU Jianxin,XIAO Yingkai,WANG Jianguo,LI Tingwei.2005.Isotope Geochemistry of Ancient Salt Rocks and Prognosis of Sylvinite Deposits in Western Tarim Basin[J].Acta Geoscientica Sinica,26(z1):174-179. |
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