塔东古城地区奥陶系碳酸盐岩中钠长石的发现及其地质意义  

Discovery of albite and its geological significance in the Ordovician carbonate rocks in Gucheng area in the east of Tarim basin

作　　者：邵红梅[1,2] 冯子辉[2] 李国蓉[3] 卢曦[2] 孟祥豪[3] 

机构地区：[1]中国地质大学(北京)能源学院,北京100083 [2]大庆油田有限责任公司勘探开发研究院,黑龙江大庆163712 [3]成都理工大学能源学院,四川成都610059

出　　处：《东北石油大学学报》2015年第2期19-25,33,共8页Journal of Northeast Petroleum University

基　　金：国家自然科学基金项目(41272150)

摘　　要：综合应用岩石薄片显微镜鉴定、电子探针分析、阴极发光显微分析及流体包裹体温度测试等，研究塔东古城地区奥陶系碳酸盐岩的岩石矿物学特征．结果表明：塔里木盆地古城地区中下奥陶统灰岩中发育钠长石自生矿物，钠长石的发育和分布具有独特性，集中发育于鹰山组灰岩地层，以偶见、分散状和沿缝合线富集3种产状分布，主要交代灰岩微晶方解石沉积组分及海底胶结物方解石等早期成岩组分；钠长石的流体温度较高，温度在340-440℃之间，与沉积时或沉积期后不久的浅海岩浆热液喷流作用有关；钠长石被晚期热液鞍状白云石交代，被缝合线及构造裂缝切割改造，为古城地区第一期热液地质作用．该地区钠长石的发现丰富塔里木盆地热液地质作用的矿物学标志，为研究热液地质作用期次和热液演化史提供依据．By applying such experiment technologies as rock thin section identification,electron microprobe analysis,cathodoluminescence microscopic analysis and temperature test of fluid inclusions,we confirmed that it developed albite authigenic mineral in the middle and lower Ordovician limestone of the Gucheng area in the eastern region of Tarim basin from the aspects of rock mineralogical characteristics.The development and distribution of albite are unique,it developed in limestone stratum of Yingshan group centrally,distributed by 3occurrences:Occasional existence,dispersion and enrichment of the sutures,mainly replaced the early diagenetic components:Limestone microcrystalline calcite deposition component and the bottom of the sea cement calcite,etc.Uniform temperature testing results of saline solution inclusions in albite show that fluid temperature of albitization is higher,temperature range is between 340~440 ℃.It should be related to shallow sea magmatic hydrothermal jet stream in sedimentary period or shortly after the sedimentation.Mineral paragenetic association and the fabric relationship study revealed that albite was replaced by the late hydrothermal saddle dolomite,cut and transformed by sutures and structural fracture,it is the first hydrothermal geological processes in Gucheng area.The discovery of albite enriched the mineralogy marks of Tarim basin hydrothermalism,provided an important basis for studying the hydrothermal process issue and hydrothermal evolution.

关 键 词：钠长石 热液地质作用 热液演化史 古城地区 塔里木盆地 奥陶系 

分 类 号：TE121.3[石油与天然气工程—油气勘探] P611[天文地球—矿床学]