黑龙江省东部晚三叠世—中侏罗世硅质岩地球化学特征及形成环境  

GEOCHEMISTRY AND FORMATION ENVIRONMENT OF THE LATE TRIASSICMIDDLE JURASSIC SILICEOUS ROCKS IN EASTERN HEILONGJIANG PROVINCE

作　　者：孙雷[1] 曾振 崔维龙[4] 王晓杰 赵青年 郝振群 李寒 张宏泽 周江 SUN Lei;ZENG Zhen;CUI Wei-long;WANG Xiao-jie;ZHAO Qing-nian;HAO Zhen-qun;LI Han;ZHANG Hong-ze;ZHOU Jiang(Shenyang Center of China Geological Survey,Shenyang 110034,China;China Aerospace Architecture Design and Research Institute Co.,Ltd.,Beijing 100162,China;College of Earth Sciences,Jilin University,Changchun 130061,China;Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China)

机构地区：[1]中国地质调查局沈阳地质调查中心,辽宁沈阳110034 [2]航天建筑设计研究院有限公司,北京100162 [3]吉林大学地球科学学院,吉林长春130061 [4]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质与资源》2021年第6期637-645,共9页Geology and Resources

基　　金：中国地质调查局项目“黑龙江省东部隐伏盆地页岩气地质条件综合调查”(1212011120973);“松辽盆地北部及外围石炭—二叠系油气地质调查”(DD20190097).

摘　　要：黑龙江省东部那丹哈达增生杂岩主要由晚三叠世—中侏罗世含放射虫硅质岩组成,并夹有镁铁-超镁铁质杂岩和晚古生代浅海沉积岩.对黑龙江省东部石场、勤得利和胜利农场地区硅质岩分析显示,样品Al_(2)O_(3)、TiO_(2)、CaO、Al_(2)O_(3)/(Al_(2)O_(3)+TFe_(2)O_(3))及ΣREE整体上偏低,具有较高的SiO_(2)含量,为纯硅质岩.结合Al-Fe-Mn三角图和K_(2)O/Na_(2)O值,表明该地区硅质岩的形成过程与海底热液作用无关.元素判别图解及地球化学特征揭示,黑龙江东部三个地区的硅质岩形成于大陆坡及边缘海环境.The Nadanhada accretionary complex in eastern Heilongjiang Province is mainly composed of the Late Triassic-Middle Jurassic radiolarian siliceous rocks intercalated with the mafic-ultramafic complex and Late Paleozoic shallow sea sedimentary rocks.The analysis results of siliceous rocks from Shichang,Qindeli and Shengli Farm areas in eastern Heilongjiang Province show that the samples,characterized by generally low Al_(2)O_(3),TiO_(2),CaO andΣREE contents and lowAl_(2)O_(3)/(Al_(2)O_(3)+TFe_(2)O_(3))ratio and high SiO_(2) content,are pure siliceous rocks.Combined with the Al-Fe-Mn triangle diagram and K_(2)O/Na_(2)O ratio,it is indicated that the formation of siliceous rocks has nothing to do with seafloor hydrothermal process.The element discrimination diagram and geochemical characteristics reveal the siliceous rocks in the above three areas were formed in continental slope and marginal sea environment.

关 键 词：硅质岩 晚三叠世—中侏罗世 地球化学特征 形成环境 黑龙江省 

分 类 号：P595[天文地球—地球化学]