莎车坳陷晚白垩-古近纪沉积环境特征及成钾条件分析  

Characteristics of Sedimentary Environment and Analysis of Potassium Formation Conditions from Late Cretaceous to Paleogene in Shache Depression

作　　者：王占兵[1] 刘星旺[1] 韦钊 王凡[1] 王占文 赵玉海[1] 郭琴 Wang Zhanbing;Liu Xingwang;Wei Zhao;Wang Fan;Wang Zhanwen;Zhao Yuhai;Guo Qin(Research Institute of Geology of CCGMB,Zhuozhou,Hebei,072750,China;Sports School of Jiuquan City,Jiuquan,Gansu 735000,China)

机构地区：[1]中化地质矿山总局地质研究院,河北涿州072750 [2]酒泉市体育运动学校,甘肃酒泉735000

出　　处：《化工矿产地质》2021年第1期17-24,共8页Geology of Chemical Minerals

基　　金：国家重点研发计划项目“中国钾盐矿产基地成矿规律与深部探测技术示范”之课题“重点含钾盆地富钾规律、战略选区与深部探测技术示范”(2017YFC0602806);中国地质调查局地质调查项目“西部地区钾盐矿产远景调查评价”(DD20160054),中国地质调查局地质调查项目“钾盐矿产调查与勘查示范”之子项目“塔里木白垩-第三纪盐盆地钾盐资源远景调查评价”(1212011220790)。

摘　　要：通过对莎车坳陷盐系地层分布特征、野外沉积构造特征、岩石学特征、古环境特征、古气候特征以及岩相古地理特征等方面进行较深入的讨论和分析,认为莎车坳陷晚白垩-古近纪盐系地层主要为吐依洛克组和阿尔塔什组,岩性以膏盐岩为主,膏岩分布主要位于莎车坳陷西部和南部,沉积厚度以喀什凹陷乌泊1井附近为最。莎车坳陷野外露头波痕、冲刷面、泥裂等沉积构造以及平行层理、水平层理、楔状交错层理等层理构造发育。莎车坳陷晚白垩-古近纪以海相沉积环境为主,盐系地层沉积相类型主要为蒸发岩相,白垩纪-古近纪古气候以温室效应为主,且出现极端干旱极热气候,为沉积巨厚层状蒸发岩提供了气候条件。而莎车坳陷在晚白垩-古近纪期间,经历5次大的海进海退,为盐类物质的沉积提供了充足的物源。因此,莎车坳陷钾盐成矿条件优越,成矿潜力巨大。By in-depth discussing and analyzing the distribution characteristics of salt series strata distribution,field sedimentary structure,petrology,palaeoenvironment,paleoclimate and Lithofacies palaeogeography in Shache depression,the paper thinks the late Cretaceous-Paleogene evaparite series strata in Shache depression are mainly Tuilok formation and Altashi formation,the lithology is mainly gypsum-salt rock,The distribution of gypsum rocks is mainly located in the west and south of Shache depression,the sediment thickness is the thickest near Wubo well 1 in Kashgar depression.The sedimentary structures of the outcrops,such as wave marks,scouring surfaces and mud cracks,and the bedding structure of parallel bedding,horizontal bedding and wedge cross bedding are developed in the Shache depression.The sedimentary environment of late Cretaceous-Paleogene in Shache depression is dominated by marine sedimentary environment.The types of sedimentary facies in the evaparite series strata are mainly evaporite facies.The Cretaceous Paleogene climate is dominated by the greenhouse effect,and the extreme drought and extreme hot climate provide climatic conditions for depositing the thick layered evaporate rocks.During the Late Cretaceous-Paleogene,the Shache depression experienced 5 major transgression and regression,which provided ample source for the deposition of salt.It is concluded that Shache depression has favorable mineralizing conditions and huge potential for potash mineralization.

关 键 词：莎车坳陷 盐系地层 蒸发岩相 膏盐岩 海相沉积 钾盐 

分 类 号：P512.2[天文地球—地质学] P619.211