干旱区生态环境知识资源中心(Arid): 鄂尔多斯盆地西南部王全口组碳酸盐岩层系沉积环境及其构造背景

Arid

	鄂尔多斯盆地西南部王全口组碳酸盐岩层系沉积环境及其构造背景
其他题名	Sedimentary environment and tectonic backgrounds of the Wangquankou Formation carbonate rock sequences in southwestern Ordos Basin
	宋立军 1; 刘池阳 2; 李光祥 3; 赵红格 2; 王建强 2; 张小龙 2; 王宇平 2
来源期刊	石油与天然气地质
ISSN	0253-9985
出版年	2016
卷号	37 期号:2 页码:224-237
中文摘要	鄂尔多斯盆地西南部沉积了一套巨厚的以王全口组为代表的中元古代碳酸盐岩层系。为预测其油气勘探前景,文章采用主、微量元素地球化学方法,探讨王全口组的岩石特征、沉积环境、构造背景及其内硅质岩的成因。结果表明,王全口组以白云岩、硅质白云岩和硅质岩为主,并含有少量石英砂岩。其中,硅质岩和硅质白云岩内硅质为生物化学成因,且几乎未遭受到陆源碎屑物质影响。V/Cr,Ni /Co,V/(V + Ni)和Ce /La氧化还原环境判别图显示,王全口组整体形成于富氧或贫氧过渡状态下的浅水沉积环境。古水温数据与Sr /Cu比值反映的结果一致,即王全口组沉积期区域古水温相对最高,应为干燥炎热的气候背景。Sr /Ba,CaO/(CaO + MgO)海陆环境判别图、Y异常和(La /Nd) _(pass)值表明,除砂岩样品外,王全口组碳酸盐岩整体形成于海相咸水环境或次咸水过渡沉积环境。综合La - Th - Sc,Th - Co - Zr /10和100Eu /SigmaREE - LREE/HREE图解,王全口组碳酸盐岩样品具有大陆岛弧,活动陆缘和陆壳- 浅海沉积体系特征,且陇县固关、炭山和盆缘桌子山地区样品同样具有高稀土含量特征,进一步表明王全口期研究区应具有大陆岛弧弧后坳陷构造背景特征。总而言之,在陆缘弧后坳陷背景和干热气候、弱氧化的浅水海陆过渡环境下,区域发育了生物化学成因的碳酸盐岩与硅质岩。
英文摘要	A very thick Middle Proterozoic carbonate strata represented by the Wangquankou Formation is distributed in the southwestern Ordos basin. In order to forecast its petroleum exploration prospects,major and trace elements were measured on samples to reveal the rock characteristics, sedimentary environment, tectonic settings and origin of siliceous rocks of the Wangquankou Formation. The Wangquankou Formation mainly consists of dolomites, siliceous dolomites and silicalites,with minor quartz sandstones. Geochemical features of siliceous materials in silicalites and siliceous dolomites clearly show a biochemical origin,with almost no influences from epicontinental clastic input. Discrimination diagrams of redox environment, such as V/Cr,Ni /Co,V/(V + Ni) and Ce /La, indicate that the Wangquankou Formation was deposited in aerobic or transitional dysaerobic shallow water. Paleo-temperature data, in good agreement with Sr /Cu values, suggest that regional temperatures were highest during deposition of the Wangquankou Formation, further indicating an arid and scorching climate background. Sr /Ba and CaO /(CaO + MgO) environment discriminant graphs,Y abnormity and (La /Nd) _(pass) ratio show that the carbonate rocks formed in marine saltwater or transitional semi-saltwater environment. A comprehensive analysis of various diagrams, such as La-Th-Sc,Th-Co-Zr /10 and 100Eu /SigmaREE- LREE /HREE graphs, indicates that carbonate samples from the Wangquankou Formation carry information of active continental margin,continental island arc and middle continent-shallow water sedimentary system. Samples from regions of Long Country Guguan, Tanshan,and Zhuozishan located at the basin margin are all characterized by high REEs, indicating a tectonic background of continental back-arc depression during the Wangquankou Stage. In conclusion, siliceous rocks and carbonate rocks of biochemical origin in this region were deposited in mild-oxidizing,marine-continental transition environment,with the backgrounds of desiccation and torridness with the tectonic settings of epicontinental back-arc depression.
中文关键词	沉积环境 ; 构造背景 ; 碳酸盐岩 ; 王全口组 ; 鄂尔多斯盆地
英文关键词	sedimentary environment tectonic setting carbonate rock Wangquankou Formation Ordos Basin
语种	中文
国家	中国
收录类别	CSCD
WOS类目	ENERGY FUELS
WOS研究方向	Energy & Fuels
CSCD记录号	CSCD:5695148
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/234896
作者单位	1.西安石油大学地球科学与工程学院, 大陆动力学国家重点实验室, 西安, 陕西 710069, 中国; 2.西北大学, 大陆动力学国家重点实验室, 西安, 陕西 710069, 中国; 3.西安石油大学地球科学与工程学院, 西安, 陕西 710069, 中国
推荐引用方式 GB/T 7714	宋立军,刘池阳,李光祥,等. 鄂尔多斯盆地西南部王全口组碳酸盐岩层系沉积环境及其构造背景[J],2016,37(2):224-237.
APA	宋立军.,刘池阳.,李光祥.,赵红格.,王建强.,...&王宇平.(2016).鄂尔多斯盆地西南部王全口组碳酸盐岩层系沉积环境及其构造背景.石油与天然气地质,37(2),224-237.
MLA	宋立军,et al."鄂尔多斯盆地西南部王全口组碳酸盐岩层系沉积环境及其构造背景".石油与天然气地质 37.2(2016):224-237.