鄂尔多斯盆地及其周缘下侏罗统凝灰岩年代学及意义

doi:10.11743/ogg20140519

摘要/Abstract

摘要： 沉积盆地地层序列中的凝灰岩是源区造山活动的直接产物，与造山带的活动性密切相关。鄂尔多斯及周缘盆地下侏罗统凝灰岩的相继发现，对于探讨早侏罗世构造演化的关键时限和大地构造背景提供了证据。以凝灰岩的锆石U-Pb年代学为线索，厘定了早侏罗世凝灰岩喷发的期次及关键时限，同时辅助以重点区域凝灰岩的地球化学特征，探讨了凝灰岩喷发的大地构造背景。研究认为：①下侏罗统凝灰岩分布具有明显的区域性，集中分布在鄂尔多斯盆地西南缘平凉、安口一带，鄂尔多斯盆地东北缘的宁武-静乐盆地及广灵盆地内，与北秦岭造山带和燕山造山带的演化密切相关；②不同地区凝灰岩的喷发时限并不完全具有等时性，鄂尔多斯西南缘平凉策底、安口地区凝灰岩的时代分别为175.2 Ma±2.4 Ma和168.4 Ma±1.3 Ma，宁武-静乐盆地陈家半沟剖面火山碎屑岩的时代为179.2 Ma±0.79 Ma，浑源-广灵盆地板塔寺剖面凝灰岩的年龄为171 Ma±1.0 Ma，总体上处于早侏罗世晚期至中侏罗世早期；③在凝灰岩微量元素Th/Hf-Ta/Hf构造环境判别图解中，所有投点全部落入了大陆裂谷带或者初始裂谷玄武岩区，反映了早侏罗世至中侏罗世早期鄂尔多斯及周缘地区整体上处于陆内拉张的构造背景。凝灰岩喷发时限的确定，也为鄂尔多斯盆地中生代热演化年代学的研究提供了直接的证据。

关键词: 凝灰岩, 锆石U-Pb年代学, 地球化学, 下侏罗统, 鄂尔多斯盆地

Abstract: Tuff in stratigraphic sequences of sedimentary basins is a direct product of the orogenic activity of the source region,and is closely related to orogenic activity.The successive discovery of the Lower Jurassic tuff in Ordos Basin and its periphery is very important for constraining the key timing of tectonic evolution and tectonic background.In this paper,we determined the critical time of tuff eruption for the Lower Jurassic using zircon U-Pb geochronology.In conjunction with the tuff geochemistry in the key areas,we discussed the tectonic background for tuff eruption.The following results were obtained.The distribution of the Lower Jurassic tuff show obvious regional differences.They mainly occur in the Pingliang and Ankou counties in the southwestern Ordos Basin and in the Ningwu-Jingle Basin and Guangling Basin of the northeastern Ordos Basin,and are closely related to the evolution of the North Qinling Orogenic belt and the Yanshan Orogenic belt.The eruption of tuff is not completely synchronous in different regions.The tuff on Cedi section and Ankou section of the southwestern Ordos Basin are dated at 175.2 Ma±2.4 Ma and 168.4 Ma±1.3 Ma respectively,the volcaniclastic rocks on the Chenjiabangou section of Ningwu-Jingle Basin at 179.2 Ma±0.79 Ma,and the tuff on the Bantasi section of Hunyuan-Guangling Basin at 171.0 Ma±1.0 Ma.Overall,the eruption of tuff is date at the late Early Jurassic to early Middle Jurassic.On the Th/Hf-Ta/Hf diagrams,all the points fall into the continental rift zones or the initial rift zones,which indicates the extensional tectonic setting from the Early Jurassic to early Middle Jurassic in Ordos Basin and its periphery.The timing of tuff eruption may provide a direct chronological evidence for study of the Mesozoic thermal evolution of the Ordos Basin.

Key words: tuff, zircon U-Pb geochronology, geochemistry, Lower Jurassic, Ordos Basin

中图分类号:

TE121.3

李振宏,冯胜斌,袁效奇,等. 鄂尔多斯盆地及其周缘下侏罗统凝灰岩年代学及意义[J]. 石油与天然气地质, 2014, 35(5): 729-741. doi: 10.11743/ogg20140519 Li Zhenhong,Feng Shengbin,Yuan Xiaoqi,et al. Chronology and its significance of the Lower Jurassic tuff in Ordos Basin and its periphery[J]. Oil & Gas Geology, 2014, 35(5): 729-741. doi: 10.11743/ogg20140519

参考文献

[1] 杨遂正, 金文化, 李振宏.鄂尔多斯多旋回叠合盆地形成与演化[J].天然气地球科学, 2006, 17(4):494-498. Yang Suizheng, Jin Wenhua, Li Zhenhong.Multicycle supermposed basin Formation and evolution of Ordos basin[J].Natural Gas Geoscience, 2006, 17(4):494-498.
[2] 李振宏, 胡健民.鄂尔多斯盆地构造演化与古岩溶储层分布[J].石油与天然气地质, 2010, 31(5):640-647. Li Zhenhong, Hu Jianmin.Structural evolution and distribution of Paleokarst reservoirs in the Ordos basin[J].Oil & Gas Geology, 2010, 31(5):640-647.
[3] 陈世加, 姚泾利, 路俊刚, 等.储层沥青成因及其对油气运聚的影响——以鄂尔多斯盆地华庆地区长8油层组1砂组为例[J].石油与天然气地质, 2012, 33(1):37-44. Chen Shijia, Yao Jingli, Lu Jungang, et al.Reservoir bitumen genesis and its impacts on hydrocarbon migration and accumulation:a case study from Chang 8¹ of Yangchang Fomation in Huaqing area, the Ordos Basin[J].Oil & Gas Geology, 2012, 33(1):37-44.
[4] 苏复义, 周文, 金文辉, 等.鄂尔多斯盆地中生界成藏组合划分与分布评价[J].石油与天然气地质, 2012, 33(4):582-590. Su Fuyi, Zhou Wen, Jin Wenhui, et al.Identification and distribution of the Mesozoic plays in Ordos Basin[J].Oil & Gas Geology, 2012, 33(4):582-590.
[5] 陈刚, 徐黎明, 丁超, 等.用自生伊利石定年确定鄂尔多斯盆地东北部二叠系油气成藏期次[J].石油与天然气地质, 2012, 33(5):713-719. Chen Gang, Xu Liming, Ding Chao, et al.Authigenic illite dating for the timing of oil-gas accumulation of the Permian reservoirs in nor-theastern Ordos Basin[J].Oil & Gas Geology, 2012, 33(5):713-719.
[6] 田建锋, 高永利, 张蓬勃, 等.鄂尔多斯盆地合水地区长7致密油储层伊利石成因[J].石油与天然气地质, 2013, 34(5):700-707. Tian Jianfeng, Gao Yongli, Zhang Pengbo, et al.Genesis of illite in Chang 7 tight oil reservoir in Heshui area, Ordos Basin[J].Oil & Gas Geology, 2013, 34(5):700-707.
[7] 孙建博, 陈刚, 章辉若, 等.鄂尔多斯盆地中新生代构造事件的峰值年龄及其沉积响应[J].西北地质, 2006, 39(3):91-96. Sun Jianbo, Chen Gang, Zhang Huiruo, et al.Peak ages and sedimentary responses of the Mesozoic-Cenozoic tectonic events in Ordos basin[J].Northwestern Geology, 2006, 39(3):91-96.
[8] 陈刚, 孙建博, 周立发, 等.鄂尔多斯盆地西南缘构造热事件的裂变径迹年龄纪录[J].中国科学(D), 2007, 37(增刊):110-118. Chen Gang, Sun Jianbo, Zhou Lifa, et al.Fission track age records of tectonic hot events in the western Ordos Basin[J].Science in China (D), 2007, 37(S):110-118.
[9] 赵孟为, Hans Ahrendt, Klaus Wemmer, 等.鄂尔多斯盆地志留-泥盆纪和侏罗纪热事件-伊利石K-Ar年龄的证据[J].地质学报, 1996, 70(2):186-194. Zhao Mengwei, Ahrendt H, Wemmer K, et al.Silurian-Devonian and Jurassic thermal events in the Ordos Basin, China:evidence from K-Ar dating on illites[J].Acta Geologica Sinica, 1996, 70(2):186-194.
[10] 孙少华, 李小明, 龚革联, 等.鄂尔多斯盆地构造热事件研究[J].科学通报, 1997, 42(3):306-309. Sun Shaohua, Li Xiaoming, Gong Gelian, et al.Research of the structural heat events in Ordos basin[J].Chinese Science Bulltin, 1997, 42(3):306-309.
[11] 高峰, 王岳军, 刘顺生.利用磷灰石裂变径迹研究鄂尔多斯盆地西缘热历史[J].大地构造与成矿学, 2000, 24(1):87-91. Gao Feng, Wang Yuejun, Liu Shunsheng.Thermal history study in the west of the Ordos basin using apatite fission track analysis [J].Geotectonica et Metallogenia, 2000, 24(1):87-91.
[12] Li Zhenhong, Dong Shuwen, Qu Hongjie.Initiation and development of Jurassic orogeny at northmargin of north China craton:evidences from detrital heavy Minerals, geochemistry and zircon U-Pb geochronology[J].Acta Geologica Sinica, 2013, 87(S):567-570.
[13] Li Zhenhong, Dong Shuwen, Qu Hongjie.Timing of the initiation of the Jurassic Yanshan movement on the north China craton:evidence from sedimentary cycles, heavy minerals, geochemistry, and zircon U-Pb geochronology[J].International Geology Review, 2014, 56(3):288-312.
[14] Ludwig KR.User's manual for isoplot/Ex:a geochronological toolkit for microsoft excel[M].Berkeley:Berkeley Geochronology Center Special Publication, 2001:1-56.
[15] Sircombe KN.Tracing provenance through the isotope ages of littoral and sedimentary detrital zircon, eastern Australia[J].Sedimentary Geology, 1999, 124:47-67.
[16] Boynton WV.Cosmochemistry of the rare earth elements:meteorite studied[M]//Rare Earth Element Geochemistry.New York:Elsevier, 1984:63-114.
[17] 李艳丽, 王世杰, 孙承兴, 等.碳酸盐岩红色风化壳Ce异常特征及形成机理[J].矿物岩石, 2005, 25(4):85-90. Li Yanli, Wang Shijie, Sun Chengxing, et al.The characteristics of Ce anomalies in weathering crusts of carbonate rocks and its formation mechanism[J].Journal of Mineralogy and Petrology, 2005, 25(4):85-90.
[18] 徐学义, 王洪亮, 陈隽璐, 等.西秦岭天水尹道寺中生代酸性火山岩锆石U-Pb定年和元素地球化学研究[J].岩石学报, 2007, 23(11):2845-2856. Xu Xueyi, Wang Hongliang, Chen Juanlu, et al.Zricon U-Pb age, element geochemistry of Mesozoic acid volcanic rocks at Yindaoshi area in western Qinling[J].Acta Petrologica Sinica, 2007, 23(11):2845-2856.
[19] 汪云亮, 张成江, 修淑芝.玄武岩形成的大地构造环境的Th/Hf-Ta/Hf图解判别[J].岩石学报, 2001, 17(3):413-421. Wang Yunliang, Zhang Chengjiang, Xiu Shuzhi.Th/Hf-Ta/Hf indentification of tectonic setting of basalts[J].Acta Petrologica Sinica, 2001, 17(3):413-421.
[20] 王晓霞, 王涛, 卢欣祥, 等.北秦岭老君山和秦岭梁环斑结构花岗岩及构造环境—一种可能的造山带型环斑花岗岩[J].岩石学报, 2003, 19(4):650-660. Wang Xiaoxia, Wang Tao, Lu Xinxiang, et al.Laojunshan and Qinlingliang rapakivi-textured granitoids in North Qinling and their tectonic setting:a possible orogenic-type rapakivi granitoids [J].Acta Petrologica Sinica, 2003, 19(4):650-660.
[21] 赵越, 宋彪, 张拴宏, 等.北京西山侏罗纪南大岭组玄武岩的继承锆石年代学及其含义[J].地学前缘, 2006, 13(2):184-190. Zhao Yue, Song Biao, Zhang Shuanhong, et al.Geochronology of inherited zircons from Jurassic Nadaling basalt of Western Hills of Beijing, North China:its implication[J].Earth Science Frontier, 2006, 13(2):184-190.
[22] 汪洋, 孙金声.北京西山早侏罗世蔡家岭组火山岩岩石学特征及其成因[J].北京地质, 1995, 6(4):27-33. Wang Yang, Sun Jinsheng.Petrological characteristics and petrogenesis of volcanics of the early Jurassic Caijialing Formation in the western hills of Beijing[J].Beijing Geology, 1995, 6(4):27-33.
[23] 张岳桥, 董树文, 赵越, 等.华北侏罗纪大地构造:综评与新认识[J].地质学报, 2007, 81(11):1462-1480. Zhang Yueqiao, Dong Shuwen, Zhao Yue, et al.Jurassic tectonics ofNorth China :a synthetic view[J].Acta Geologica Sinica, 2007, 81(11):1462-1480.
[24] 董树文, 张岳桥, 龙长兴, 等.中国侏罗纪构造变革与燕山运动新诠释[J].地质学报, 2007, 81(11):1449-1461. Dong Shuwen, Zhang Yueqiao, Long Changxing, et al.Jurassic tecto-nic revolution in China and new interpretation of the Yanshan Movement[J].Acta Geologica Sinica, 2007, 81(11):1449-1461.
[25] 张岳桥, 廖昌珍, 施炜, 等.论鄂尔多斯盆地及其周缘侏罗纪变形[J].地学前缘, 2007, 14(2):182-196. Zhang Yueqiao, Liao Changzhen, Shi Wei, et al.On the Jurassic tectonics in and around the Ordos basin, north China[J].Earth Science Frontier, 2007, 14(2):182-196.
[26] 邱欣卫, 刘池洋, 毛光周, 等.鄂尔多斯盆地上三叠统延长组凝灰岩夹层Th元素的富集特征[J].地质通报, 2010, 29(8):1185-1191. Qiu Xinwei, Liu Chiyang, Mao Guangzhou, et al.Enrichment feature of thorium element in tuff interlayers of Upper Triassic Yanchang Formation in Ordos basin, China[J].Geological Bulletin of China, 2010, 29(8):1185-1191.
[27] 邓秀芹, 蘭昉晓, 刘显阳, 等.鄂尔多斯盆地三叠系延长组沉积演化及其与早印支运动关系的探讨[J].古地理学报, 2008, 10(2):159-166. Deng Xiuqin, Lan Fangxiao, Liu Xianyang, et al.Disccusion on relationship between sedimentary evolution of the Triassic Yanchang Formation and the Early Indosinian Movement in Ordos basin [J].Journal of Paleogeography, 2008, 10(2):159-166.
[28] 陈安清, 陈洪德, 侯明才, 等.鄂尔多斯盆地中-晚三叠世事件沉积对印支运动Ⅰ幕的指示[J].地质学报, 2011, 85(10):1681-1690. Chen Anqing, Chen Hongde, Houmingcai, et al.The Middle—Late Triassic event sediments in 0rdos Basin:indicators for episode I of the Indosinian Movement[J].Acta Geologica Sinica, 2011, 85(10):1681-1690.
[29] 赵祯祥, 杜晋峰.晋东北地区燕山运动的基本特征-来自1:25万应县幅区域地质调查的总结[J].地质力学学报, 2007, 13(2):150-162. Zhao Zhenxiang, Du Jinfeng.Basic characteristics of the Yanshan movement in northeastern Shanxi—a summary of regional survey of the 1:250000 Yingxian county sheet[J].Journal of Geomechanics, 2007, 13(2):150-162.
[30] 邹和平, 张珂, 李刚.鄂尔多斯盆地早白垩世构造-热事件:杭锦旗构造玄武岩的Ar-Ar年代学证据[J].大地构造与成矿学, 2008, 32(3):360-364. Zou Heping, Zhang Ke, Li Gang.Cretaceous tecotono-thermal event in the Ordos black:an Ar-Ar chronological evidence from basalt at Hangjinqi banner, Inner Mongolia, North China Craton[J].Geotectonica et Metallogenia, 2008, 32(3):360-364.
[31] 杨兴科, 晁会霞, 郑孟林, 等.鄂尔多斯盆地东部紫金山岩体SHRIMP测年地质意义[J].矿物岩石, 2008, 28(1):54-63. Yang Xingke, Zhao Huixia, Zheng Menglin, et al.Geological significance of SHRIMP dating of Zijinshan Alkali complex in the eastern Ordos basin, China [J].Journal of Mineralogy and Petrology, 2008, 28(1):54-63. 