山东大汶口盆地石盐地球化学特征及其成因

Geochemical Characteristics of Evaporites from Halite Deposits in Dawenkou Basin，Shandong Province

中文关键词:  第三纪  大汶口盆地  石盐  石膏  钾盐  溴含量

英文关键词:Tertiary  Dawenkou basin  Halite  Gypsum  Potash  Bromine content

中文摘要:

      白垩纪晚期 -第三纪早期喜马拉雅期运动在中国东部形成一系列的内陆断陷含盐盆地，其中不少是中国的主力油气盆地。山东大汶口盆地是该时期山东地区西部最大的沉积赋矿盆地，也是中国东部发现的唯一含钾盐的盆地，盆地中富含石膏、岩盐、钾盐、自然硫等蒸发岩型矿产资源。大汶口盆地具有东向洼地、满庄 -大西牛洼地两个沉降中心。本研究即通过满庄 -大西牛洼地附近的钻孔，首次对山东大汶口盆地石盐地球化学特征进行了包括溴含量在内的系统分析，同时分析了石膏夹层的硫同位素。山东大汶口盆地石盐的溴含量在(3～19)× 10-6之间，硫同位素在 14.7‰～35.7‰之间，这些分析结果都揭示山东大汶口盆地石盐为内陆盐湖成因。

英文摘要:

      From the late Cretaceous to the early Tertiary，a series of inland faulted saline basins were formed in eastern China due to the Himalayan movement，many of which are the main oil and gas basins in China.Dawenkou basin is the largest sedimentary ore bearing basin in the western part of Shandong Province，and the only potash bearing basin found in eastern China. The basin has abundant evaporite resources such as gyp.sum，rock salt，potash and natural sulfur. Dawenkou basin has two subsidence centers，Dongxiang depres. sion and Manzhuang-Daxiniu depression. In this study，the geochemical characteristics of halite and gypsum from evaporite in Dawenkou basin，Shandong Province，including bromine contents，were systematically ana. lyzed by drilling holes near Manzhuang-Daxiniu depression for the first time. The bromine contents of halite in Dawenkou basin，Shandong Province are(3～19)×10-6 and the sulfur isotope data range is 14.7‰～35.7‰. These analysis results reveal that the halite in Dawenkou basin，Shandong Province is of inland salt lake ori. gin.