沉积环境中古盐度的恢复——以吐哈盆地西南缘水西沟群泥岩为例  

Recovery Paleosalinity in Sedimentary Environment —An example of mudstone in Shuixigou group, southwestern margin of Turpan-Hami basin

作　　者：王敏芳[1] 焦养泉[1] 王正海[1] 杨琴[1] 杨生科[1] 

机构地区：[1]中国地质大学资源学院,武汉430074

出　　处：《新疆石油地质》2005年第6期719-722,共4页Xinjiang Petroleum Geology

基　　金：国土资源大调查地质调查项目;吐哈盆地西南缘砂岩型铀矿远景区水西沟群层序地层与沉积体系分析(20001010174003)资助

摘　　要：用锶钡法、硼元素法、钾钠比值和沉积磷酸盐法推算了吐哈盆地西南缘水西沟群沉积古水介质环境。认为,在水西沟群沉积时期,古水介质总体为淡水环境[m(Sr)/m(Ba)<1、m(B)为12.30×10-6～64.20×10-6],且自八道湾组—西山窑组沉积时期古水介质逐渐变淡:八道湾组沉积时期,古水介质盐度平均为2.28‰;三工河组沉积时期,平均为2.23‰;西山窑组沉积时期,平均为2.07‰.此外,对恢复沉积环境古盐度的其他方法进行了讨论,并指出了各种方法的局限性。The paleoaqueous environment of Shuixigou group deposit in southwestern margin of Turpan-Hami basin is predicted by using Sr-Ba, B, K/Na and phosphate methods. The results show the fresh-water environment in the period of Shuixigou group with Sr/Ba ratio of less than 1 and B content ranging from 12.30ppm to 64.20ppm, and paleosalinity from 2.28%o of J1b to 2.23‰ of J1x, averaging 2.07‰. Also, the other methods to recover paleosalinity in sedimentary environment are discussed and their limitations are presented in this paper.

关 键 词：古盐度 地球化学 吐哈盆地 沉积环境 

分 类 号：TE112.221[石油与天然气工程—油气勘探]