Origin of grained dolomite from the Buqu Formation of Zaring area in southern Qiangtang depression
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摘要:
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。
Abstract:The genetic mechanism of dolomite of the Middle Jurassic Buqu Formation in the Qiangtang depression was studied by using microscopy, fluid Inclusion data, and carbon and oxygen isotope analysis. The results show that the dolomites in the study area can be divided into fine-powdery dolomite, medium dolomite and coarse dolomite according to grain size. Dolomite generally has a fogged center and clear margin structure, in the cracks near the extensive development of grained saddle dolomite. Fluid inclusions in the dolomite have homogenization temperature ranging between 150.2 and 216.0℃ and average salinity of 24.5%NaCl, much higher than the homogenization temperature and salinity of fluid inclusions in calcite, indicating a high temperature and high salinity diagenetic environment. The isotopic analysis shows that δ13CPDB values vary from-0.01‰ to 3.43‰, and δ18OPDB values vary from-11.17‰ to -7.68‰; according to the dolomite-fluid oxygen isotope fractionation equation, the δ18OSMOW values of dolomitization fluid are in the range of 4.82‰-12.85‰, It is believed that the matrix dolomite and the saddle dolomite that are filled in the pores in the study area are the products of host limestone altered by the high salinity fluid heated by the magma activity in a close environment, while the high salinity fluid due to the consumption of magnesium ions led to over-saturation of fluid calcite and then to the precipitation if high-temperature calcite. Therefore, hydrothermal activity was very significant for the development of dolomite of the Middle Jurassic Buqu Formation in the study area.
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Key words:
- fluid inclusion /
- carbon and oxygen isotope /
- dolomite /
- Buqu Formation /
- Zaring area
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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
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
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