塔中地区中2井良里塔格组溶洞方解石胶结序列及环境指示
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摘要
为了对塔中地区南缘断裂带附近的中2井上奥陶统良里塔格组灰岩溶洞中发育的不同类型方解石胶结物的流体环境及胶结期次进行精细化研究,结合前人的研究成果,在岩心及镜下薄片观察基础上,运用流体包裹体、阴极发光、LA-ICP-MS等测试方法进行分析研究,依次划分出纤维-柱状和粒状两种晶形方解石胶结物,后者细分为颗粒较大和颗粒较小两种。纤维-柱状方解石胶结物具有高温中盐度特征,而Fe/Mn、Na具有淡水特征,Sr含量具有地层水特征。粒状方解石胶结物具有高温特征,其中晶粒小的粒状方解石胶结物具有中高盐度、较强阴极发光性、Fe/Mn具有海水的性质、Sr元素流失特征;晶粒大的粒状方解石胶结物包裹体具有高盐度、阴极发光性差、Sr元素流失的特征。方解石胶结物整体上稀土元素强烈亏损,但是与二叠纪岩浆稀土总量相近,具有轻稀土富集、重稀土亏损特征。早期形成的纤维状-柱状方解石胶结物成岩流体记录了大气淡水和外来热流体的混合影响,而后期的两类粒状方解石胶结物可能记录了热流体与奥陶纪海水、热流体与大气淡水的混合成因流体环境,多期方解石胶结物元素特征也揭示了大气淡水活动的间歇性影响。
Based on the core observation,combined with comprehensive analysis of ordinary thin sections and inclusions,CL,LA-ICP-MS,etc.,the fluid condition and cementation sequence of the calcite in the limestone caves of the Ordovician Lianglitage Formation near the Well Zhong-2 in the southern margin of the Tazhong area,Tarim Basin are studied.It shows that granular and fibercolumnar crystalline calcite cements with high temperature characteristics occur in the rocks,implyingthat the general transformation of thermal fluids may be affected by Permian magmatic activity,and the stratum adjacent the Zhong-2 well may provide advantageous fluid activity pathway.Characteristics of temperatures,salinities,and composition indicate that different phases of cements have been significantly affected by mixed effects of thermal fluids,formation water and atmospheric fresh water.It is considered that granular calcite cement may record thermal fluid and Ordovician seawater.The combination of hot fluids and atmospheric fresh water creates a fluid environment,while the fibrous-column calcite cement resulted from diagenetic fluids record the mixed effects of atmospheric fresh water and external thermal fluids, with intermittent effect of atmospheric freshwater activity.
Based on the core observation,combined with comprehensive analysis of ordinary thin sections and inclusions,CL,LA-ICP-MS,etc.,the fluid condition and cementation sequence of the calcite in the limestone caves of the Ordovician Lianglitage Formation near the Well Zhong-2 in the southern margin of the Tazhong area,Tarim Basin are studied.It shows that granular and fibercolumnar crystalline calcite cements with high temperature characteristics occur in the rocks,implyingthat the general transformation of thermal fluids may be affected by Permian magmatic activity,and the stratum adjacent the Zhong-2 well may provide advantageous fluid activity pathway.Characteristics of temperatures,salinities,and composition indicate that different phases of cements have been significantly affected by mixed effects of thermal fluids,formation water and atmospheric fresh water.It is considered that granular calcite cement may record thermal fluid and Ordovician seawater.The combination of hot fluids and atmospheric fresh water creates a fluid environment,while the fibrous-column calcite cement resulted from diagenetic fluids record the mixed effects of atmospheric fresh water and external thermal fluids, with intermittent effect of atmospheric freshwater activity.
引文
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[10]Gasparrini M,Bakker R J,Bechstdt T.Characterization of dolomitizing fluids in the carboniferous of the Cantabrian zone(NW Spain):A fluid-inclusion study with cryo-raman spectroscopy[J].Journal of Sedimentary Research,2006,76:1304-1322.
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[18]易金,曾乔松,李鹏春,等.塔中奥陶系碳酸盐岩流体包裹体特征及其对成岩作用和深部流体作用的指示意义[J].矿物学报,2011,31(3):425-433.Yi J,Zeng Q S,Li P C,et al.Ordovician carbonate rock inclusion features and its indicative significance to diagenesis and deep fluids action in Tazhong area,Tarim Basin[J].Acta Mineralogica Sinica,2011,31(3):425-433.(in Chinese)
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