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南羌塘坳陷扎仁地区中侏罗统布曲组晶粒白云岩成因分析

田康志, 季长军, 伊海生, 谭梅, 金峰, 范立顺. 2019. 南羌塘坳陷扎仁地区中侏罗统布曲组晶粒白云岩成因分析[J]. 中国地质, 46(2): 398-406. doi: 10.12029/gc20190216
引用本文: 田康志, 季长军, 伊海生, 谭梅, 金峰, 范立顺. 2019. 南羌塘坳陷扎仁地区中侏罗统布曲组晶粒白云岩成因分析[J]. 中国地质, 46(2): 398-406. doi: 10.12029/gc20190216
TIAN Kangzhi, JI Changjun, YI Haisheng, TAN Mei, JIN Feng, FAN Lishun. 2019. Origin of grained dolomite from the Buqu Formation of Zaring area in southern Qiangtang depression[J]. Geology in China, 46(2): 398-406. doi: 10.12029/gc20190216
Citation: TIAN Kangzhi, JI Changjun, YI Haisheng, TAN Mei, JIN Feng, FAN Lishun. 2019. Origin of grained dolomite from the Buqu Formation of Zaring area in southern Qiangtang depression[J]. Geology in China, 46(2): 398-406. doi: 10.12029/gc20190216

南羌塘坳陷扎仁地区中侏罗统布曲组晶粒白云岩成因分析

  • 基金项目:
    中国地质调查局项目"羌塘盆地隆鄂尼-鄂斯玛地区油气地质构造调查"(121201010000150014)资助
详细信息
    作者简介: 田康志, 男, 1992年生, 硕士生, 沉积学与岩相古地理专业, 主要从事沉积学研究; E-mail:tiankangzhiwd@126.com
    通讯作者: 季长军, 男, 1986年生, 助理研究员, 现从事沉积地质与油气地质研究工作; E-mail:286648795@qq.com
  • 中图分类号: P588.24+5

Origin of grained dolomite from the Buqu Formation of Zaring area in southern Qiangtang depression

  • Fund Project: Supported by China Geological Survey Program (No. 121201010000150014)
More Information
    Author Bio: TIAN Kangzhi, male, born in 1992, master candidate, engages in the research on sedimentology. E-mail:tiankangzhiwd@126.com .
    Corresponding author: JI Changjun, male, born in 1986, assistant researcher, engages in depositional geology and oil and gas geology research. E-mail:286648795@qq.com
  • 以青藏高原南羌塘坳陷扎仁地区中侏罗统布曲组晶粒白云岩为对象对其进行成因的研究。通过显微镜观察、流体包裹体数据以及碳氧同位素分析,认为研究区白云岩可分为细粉晶白云岩、中晶白云岩以及粗晶白云岩,在裂隙附近还广泛发育晶粒较粗大的鞍形白云石。白云石中流体包裹体均一温度在150.2~216.0℃,盐度均值达到了24.5% NaCl,远高于方解石包裹体均一温度与盐度,表明白云石的形成经历了高温高盐度的过程。白云石碳氧同位素分析显示其δ13CPDB值为-0.01‰~3.43‰,δ18OPDB值为-11.17‰~-7.68‰,通过白云石-水氧同位素分馏方程得到白云化流体的δ18OSMOW值为4.82‰~12.85‰,δ13CPDB对比认为白云石受寄主灰岩环境的影响。通过碳氧同位素数据对比以及前人的研究结果,认为研究区白云岩为相对封闭环境下受岩浆活动加热的高盐度流体对寄主灰岩交代的产物,高盐度流体由于镁离子的消耗导致流体对方解石过饱和,继而沉淀了高温的方解石。因此,热液活动对研究区中侏罗统布曲组白云岩的发育具有重要意义,值得加强对这一方向的探索研究。

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  • 图 1  扎仁地区布曲组白云岩分布及采样位置图

    Figure 1. 

    图 2  扎仁地区布曲组白云岩野外露头及柱状图

    Figure 2. 

    图 3  布曲组白云岩显微照片(单偏光)

    Figure 3. 

    图 4  白云石与方解石包裹体均一温度分布直方图

    Figure 4. 

    图 5  Land分馏方程计算的温度与白云石矿物以及流体δ18O关系图

    Figure 5. 

    表 1  白云石与方解石流体包裹体均一温度与盐度分析结果

    Table 1.  Analytical data of homogenization temperature and salinity of fluid inclusions in dolomite and calcite

    下载: 导出CSV

    表 2  布曲组白云岩碳氧同位素分析结果

    Table 2.  Analytical data of oxygen and carbon stable isotopes from dolostones from Buqu Formation

    下载: 导出CSV
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出版历程
收稿日期:  2017-09-06
修回日期:  2018-03-14
刊出日期:  2019-04-25

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