准南与柴窝堡凹陷芦草沟组页岩地球化学特征对比与古环境恢复  

Difference of Geochemical Characteristics and Paleoenvironment Reconstruction of the Lucaogou Formation between Southern Junggar Basin and Chaiwopu Sag

作　　者：张逊[1] 庄新国[1] 涂其军 徐仕琪 张娅[1] 

机构地区：[1]中国地质大学(武汉)构造油气资源教育部重点实验室,湖北武汉430074 [2]新疆维吾尔自治区地质调查院,新疆乌鲁木齐830000

出　　处：《新疆地质》2016年第3期423-427,共5页Xinjiang Geology

摘　　要：在野外露头实测、系统采样基础上,结合地球化学分析测试资料,着重讨论了准噶尔盆地南缘二叠系芦草沟组主量元素、微量元素及稀土元素等地球化学特征,在此基础上恢复了研究区二叠系芦草沟组沉积时的古环境,对比了准南与柴窝堡凹陷芦草沟组沉积的差异性。结果表明,柴窝堡凹陷芦草沟组常量元素中Ca,K,Mg和Na相对富集,P相对较少,微量元素比值V/(V+Ni)及V/Cr均低于准南,轻稀土元素相对富集。准南与柴窝堡凹陷芦草沟组优质烃源岩主要发育于生产力较高、水体缺氧的还原环境,但相对于柴窝堡凹陷芦草沟组,准南芦草沟组页岩形成于生产力更高、水体更深且更缺氧的古环境,该环境更有利于总有机碳的形成与保存。Shale in the Lucaogou Formation having being developed in southern Junggar Basin and Chaiwopu Sag are rich in organic matters and are high quality source rock in lacustrine strata of northwestern China.On the basis of the re- search data at home and abroad,integrated with the results of geochemical test data of the Lucaogou Formation,we dis- cussed the major elements,trace elements and REE geochemical characteristics and recovered and compared the paleoen- vironment of the Lucaogou Formation between southern Junggar Basin and Chaiwopu Sag.The results showed that the source rocks of Lucaogou Formation are mainly concentrated in high paleoproductivity and anoxic reduction environ- ment.But the paleoproductivity of Lucaogou Formation of southern Junggar Basin was deposited in higher paleoproduc- tivity and more anoxic environment than Chaiwopu Sag.

关 键 词：准南 芦草沟组 页岩 地球化学 古环境 

分 类 号：P618.13[天文地球—矿床学]