鄂尔多斯盆地南缘奥陶纪沉积充填记录的关键时限及其构造意义
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摘要
鄂尔多斯盆地南缘上、下古生界呈现明显的角度不整合,标志着该区卷入了加里东造山带变形。本文以盆地内奥陶纪沉积充填记录为线索,利用地层序列中沉积凝灰岩的锫石U-Pb同位素测年,结合秦岭造山带岩体年代学研究成果,探讨了秦岭加里东期构造事件的发生与发展过程。研究表明:1)奥陶系沉积时期,沉积序列经历了海侵至海退的完整旋回,中奥陶世马五期海退序列开始,晚奥陶世背锅山期海水自鄂尔多斯盆地西南缘完全退出;2)晚奥陶世平凉期至背锅山期,地层序列中凝灰岩、滑塌构造、滑塌角砾岩普遍发育,滑塌构造和滑塌角砾岩的直接触发因素是构造活动引发的地震,构造活动性明显加强;3)中奥陶世马五期海退序列的开始,孕育着秦岭洋壳板块开始向北俯冲,时限大约为475~463 Ma;4)晚奥陶世平凉期,沉积序列中重力流、滑塌构造和凝灰岩普遍发育,孕育着秦岭洋向北的俯冲碰撞进入了高峰阶段,其时限大约为454~450 Ma。
The formation between Upper and Lower Paleozoic shows obvious angular unconformity on the southern Ordos Basin,and constitutes the Caledonian tectonic zone with orogeny in the basin marginal belt.In the paper,depending on sedimentary filling records of Ordovician,using zircon U-Pb dating of tuffs,combing with research results of volcanic chronology in the Qingling orogeri,we discuss the initiation and development about the tectonic event.The conclusions include the following aspects:1) During the Ordovician sedimentation,sedimentary sequences record one complete cycle from transgression to regression,the regression sequences began on the fifth section of the Majiagou Formation of Middle Ordovician,seawater quit completely Ordos Basin on the Beiguoshan stage of Late Ordovician;2) From Pingliang term to Beiguoshan stages of Late Ordovician,the tuffs and slump structures and limestone breccia developed commonly in the stratigraphic sequence,slump structures and limestone breccia resulted from ancient seismic slumping caused by tectonic movement;3) The regression sequences begin on the fifth section of Majiagou Formation of Middle Ordovician,indicating the initiation age of Early Paleozoic island arcs in northern Qinling,the time is about 475 ~463 Ma;4) On the Pingliang stage of Late Ordovician,the tuffs,slump structures and limestone breccia developed well in the stratigraphic sequence,indicating the intensive activity age of Early Paleozoic island arcs in northern Qinling,the time is about 454~450 Ma.
The formation between Upper and Lower Paleozoic shows obvious angular unconformity on the southern Ordos Basin,and constitutes the Caledonian tectonic zone with orogeny in the basin marginal belt.In the paper,depending on sedimentary filling records of Ordovician,using zircon U-Pb dating of tuffs,combing with research results of volcanic chronology in the Qingling orogeri,we discuss the initiation and development about the tectonic event.The conclusions include the following aspects:1) During the Ordovician sedimentation,sedimentary sequences record one complete cycle from transgression to regression,the regression sequences began on the fifth section of the Majiagou Formation of Middle Ordovician,seawater quit completely Ordos Basin on the Beiguoshan stage of Late Ordovician;2) From Pingliang term to Beiguoshan stages of Late Ordovician,the tuffs and slump structures and limestone breccia developed commonly in the stratigraphic sequence,slump structures and limestone breccia resulted from ancient seismic slumping caused by tectonic movement;3) The regression sequences begin on the fifth section of Majiagou Formation of Middle Ordovician,indicating the initiation age of Early Paleozoic island arcs in northern Qinling,the time is about 475 ~463 Ma;4) On the Pingliang stage of Late Ordovician,the tuffs,slump structures and limestone breccia developed well in the stratigraphic sequence,indicating the intensive activity age of Early Paleozoic island arcs in northern Qinling,the time is about 454~450 Ma.
引文
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李振宏,胡健民.2010.鄂尔多斯盆地构造演化与古岩溶储层分布.石油与天然气地质,31(5):640—655.Li Zhenhong and Hu Jianmin.2010.Structural evolution and distribution of paleokarst reservoirs in the Ordos Basin.Oil&Gas Geology,31(5):640—655.
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刘少峰,张国伟.2005.盆山关系研究的基本思路、内容和方法.地学前缘,12(3):101—111.Liu Shaofeng and Zhang Guowei.2005.Fundamental ideas,contents and methods in study of basin and mountain relationships.Earth Science Frontiers,12(3):101—111.
梅志超,陈景维,卢焕勇等.1982.陕西富平中奥陶统平凉组的深水碳酸盐碎屑流.石油与天然气地质,3(1):49—56.Mei Zhichao,Chen Jingwei,Lu Huanyong et al.1982.Deep water carbonate debris flow in the Middle Ordovician Pingliang Formation of Fuping,Shaanxi.Oil&Gas Geology,3(1);49—56.
钱锋,艾永峰.2002.鄂尔多斯南部地区早古生代主动大陆边缘演化特征.西安工程学院学报,24(1):18—24.Qian Feng and Ai Yongfeng.2002.Characteristics and evolution of active continental margin during Early Palaeozoic era in southern Ordos.Journal of XVan Engineering University,24(1):18—24.
屈红军,梅志超,李文厚等.2010.陕西富平地区中奥陶统等深流沉积的特征及其地质意义.地质通报,29(9):1304—1309.Qu Hongjun,Mei Zhichao,Li Wenhou et al.2010.The characteristics of Middle Ordovician contour current deposits and geological implication in Fuping region,Shaanxi Province,China.Geological Bulletin of China,29(9):1304—1309.
宋立军,陈隽璐,张英利等.2010.鄂尔多斯盆地西南部油水河地区上三叠统碎屑锆石U-Pb年代学特征及其地质意义.地质学报,84(3):370—386.Song Lijun,Chen Juanlu,Zhang Yingli et al.2010.U-Pb chronological characteristics of Late Triassic sediment in southwestern Ordos and its tectonic significance.Acta Geologka Sinica,84(3):370—386.
王洪亮,何世平,陈隽璐等.2006.北秦岭西段红花铺俯冲型侵入体LA-ICP-MS定年及其地质意义.现代地质,20(4):536—544.Wang Hongliang,He Shiping,Chen Juanlu et al.2006.LA-ICPMS dating of zircon U-Pb and tectonic significance of Honghuapu subduction-related intrusions in the west segment of northern Qinling Mountains.Geoscience,20(4):536—544,
王志浩,Bergstrom S M,甄勇毅等.2013.甘肃乎凉晚奥陶世平凉组牙形刺的新发现及其意义.微体古生物学报,30(2):123—131.Wang Zhihao,Bergstrom S M,Zhen Yongyi et al.2013.New discovery of conodonts from the Upper Ordovician Pingliang Formation of Pingliang,Cansu,China and its significance.Acta Micropalaeontologica Sinica,30(2):123—131.
吴胜和,冯增昭,张吉森.1994.鄂尔多斯地区西缘和南缘中奥陶统平凉组重力流沉积,石油与天然气地质,15(3):226—234.Wu Shenghe,Feng Zengzhao and Zhang Jisen.1994.Sedimentology of gravity flow deposits of Middle Ordovician Pingliang Formation in west and south margins of Ordos.Oil&Gas Geology,15(3);226—234.
吴素娟,李振宏,胡健民等.2014.鄂尔多斯盆地南缘赵老峪剖面奥陶系凝灰岩SHRIMP U-Pb错石定年及其地质意义.地质论评,60(4):903—912.Wu Sujuan,Li Zhenhong,Hu Jianmin et al.2014.Conformations of Ordovician sediments in south margin of Ordos Basin by SHRIMP U-Pb zircon dating of volcanic tuff interlayers and its significance.Geological Review,60(4):903—912.
杨遂正,金文化,李振宏.2006.鄂尔多斯多旋回叠合盆地形成与演化.天然气地球科学,17(4):494—498.Yang Suizheng,Jin Wenhua and Li Zhenhong.2006.Multicycle supermposed basin form and evolution of Ordos Basin.Natural Gas Geoscience,17(4):494—498.
袁卫国,赵一鸣.1996a.鄂尔多斯南部地区早古生代被动大陆边缘特征与演化.西北大学学报(自然科学版),26(5):451—454.Yuan Weiguo and Zhao Yiming.1996a.Characteristics and evolution of passive continental margin during Early Palaeozoic era in southern Ordos.Journal of Northwest University(Natural Science Edition),26(5):451—454.
袁卫国,王平.1996b.鄂尔多斯盆地南部地区的加里东运动.西安地质学院学报,18(1):36—42.Yuan Weiguo and Wang Ping.1996b.On the Caledonian movement in the southern Ordos Basin.Journal of Xi'an College of Geology,18(1):36—42.
袁效奇,苏德辰,贺静等.2014.鄂尔多斯南缘中奥陶统中的滑塌构造及其地震成因.地质论评,60(3):529—540.Yuan Xiaoqi,Su Dechen,He Jing et al.2014.The slump structures in the Middle Ordovician on the southern margin of Ordos Basin and their seismic origin.Geological Review,60(3):529—540.
赵姣,陈丹玲,谭清海等.2012.北秦岭东段二郎坪群火山岩锆石的LA.ICP-MS U-Pb定年及其地质意义.地学前缘,19(4):118—125.Zhao Jiao,Chen Danling,Tan Qinghai et al.2012.Zricon LA-ICP-MS U-Pb dating of basic volcanics from Erlangping Group of the North Qinling,eastern Qingling Mountains and its geological implications.Earth Science Frontiers,19(4);118—125.
张长厚,徐德斌,张维杰等.2004.同构造沉积分析反演逆冲推覆构造变形过程——燕山东段凌源南部中生代逆冲构造变形过程研究.地学前缘,11(3):227—243.Zhang Changhou,Xu Debin,Zhang Weijie et al.2004.Synteetonic sedimentation analysis applied to the reconstruction of the thrusting deformation process:An example from the Mesozoic thrust tectonics in eastern Yanshan orogenic belt,south of Lingyuan City,Western Liaoning Province.Earth Science Frontiers,11(3):227—243.
张成立,刘良,王涛等.2013.北秦岭早古生代大陆碰撞过程中的花岗岩浆作用.科学通报,58(23):2323—2329.Zhang Chengli,Liu Liang,Wang Tao et al.2013.Granitic magmatism related to Early Paleozoic continental collision in North Qinling.Chinese Science Bulletin,58(35):4405—4410.
周鼎武,翦万筹.1989.渭北西部地区加里东构造带变形特征及其地质意义.西北大学学报(自然科学版),19(4):93—101.Zhou Dingwu and Jian Wanchou.1989.The Caledonian fold and fault zone in the area northwest of the Weihe River and geologic significance.Journal of Northwest University{Natural Science Edition),19(4);93—101.
Ludwig K R.2001.User's Manual for Isoplot/Ex Rev.2.49;A Geochronological Toolkit for Microsoft Excel,Berkeley:Berkeley Geochronological Centre Special Publication.1—55.
Sircombe K N.1999.Tracing provenance through the isotope ages of littoral and sedimentary detrital zircon,eastern Australia.Sedimentary Geology,124(1):47—67.
陈隽璐,徐学义,王洪亮等.2008.北秦岭西段唐藏石英闪长岩岩体的形成时代及其地质意义.现代地质,22(1):45—52.Chen Juanlu,Xu Xueyi,Wang Hongliang et al.2008.LA-ICP-MS zricon U-Pb dating of Tangzang quartz-diorite pluton in the west segment of North Qinling Mountains and its tectonic significance.Geoscience,22(1):45—52.
方国庆,毛曼君.2007.陕西富平上奥陶统遗迹化石及其环境意义.同济大学学报(自然科学版),35(8):1118—1121.Fang Cuoqing and Mao Manjun.2007.Trace fossils and sedimentary environments of Upper Ordovician of Fuping in Shaanxi,China.Journal of Tongji University(Natural Science),35(8):1118—1121.
付金华,郑聪斌.2001.鄂尔多斯盆地奥陶纪华北海和祁连海演变及岩相古地理特征.古地理学报,3(4):25—24.Fu Jinhua and Zheng Congbin.2001.Evolution between North China Sea and Qilian Sea of the Ordovician and the characteristics of lithofacies palaeogeography in Ordos Basin.Journal of Palaeogeography,3(4);25—24.
郭彦如,赵振宇,付金华等.2012.鄂尔多斯盆地奥陶纪层序岩相古地理.石油学报,33(增刊2):95—109.Guo Yanru,Zhao Zhenyu,Fu Jinhua et al.2012.Sequence lithofacies paleogeography of the Ordovician in Ordos Basin,China.Acta Petrolei Sinica,33(suppl.2):95—109.
李振宏,胡健民.2010.鄂尔多斯盆地构造演化与古岩溶储层分布.石油与天然气地质,31(5):640—655.Li Zhenhong and Hu Jianmin.2010.Structural evolution and distribution of paleokarst reservoirs in the Ordos Basin.Oil&Gas Geology,31(5):640—655.
刘军锋,孙勇,张红.2007.北秦岭罗汉寺岩群锆石年龄及地质意义.西北大学学报(自然科学版),37(6):907—911.Liu Junfeng,Sun Yong and Zhang Hong.2007.Zricon age of Luohansi Group in the northern Qinling and their geological significance.Journal of Northwest University(Natural Science Edition),37(6):907—911.
刘少峰,张国伟.2005.盆山关系研究的基本思路、内容和方法.地学前缘,12(3):101—111.Liu Shaofeng and Zhang Guowei.2005.Fundamental ideas,contents and methods in study of basin and mountain relationships.Earth Science Frontiers,12(3):101—111.
梅志超,陈景维,卢焕勇等.1982.陕西富平中奥陶统平凉组的深水碳酸盐碎屑流.石油与天然气地质,3(1):49—56.Mei Zhichao,Chen Jingwei,Lu Huanyong et al.1982.Deep water carbonate debris flow in the Middle Ordovician Pingliang Formation of Fuping,Shaanxi.Oil&Gas Geology,3(1);49—56.
钱锋,艾永峰.2002.鄂尔多斯南部地区早古生代主动大陆边缘演化特征.西安工程学院学报,24(1):18—24.Qian Feng and Ai Yongfeng.2002.Characteristics and evolution of active continental margin during Early Palaeozoic era in southern Ordos.Journal of XVan Engineering University,24(1):18—24.
屈红军,梅志超,李文厚等.2010.陕西富平地区中奥陶统等深流沉积的特征及其地质意义.地质通报,29(9):1304—1309.Qu Hongjun,Mei Zhichao,Li Wenhou et al.2010.The characteristics of Middle Ordovician contour current deposits and geological implication in Fuping region,Shaanxi Province,China.Geological Bulletin of China,29(9):1304—1309.
宋立军,陈隽璐,张英利等.2010.鄂尔多斯盆地西南部油水河地区上三叠统碎屑锆石U-Pb年代学特征及其地质意义.地质学报,84(3):370—386.Song Lijun,Chen Juanlu,Zhang Yingli et al.2010.U-Pb chronological characteristics of Late Triassic sediment in southwestern Ordos and its tectonic significance.Acta Geologka Sinica,84(3):370—386.
王洪亮,何世平,陈隽璐等.2006.北秦岭西段红花铺俯冲型侵入体LA-ICP-MS定年及其地质意义.现代地质,20(4):536—544.Wang Hongliang,He Shiping,Chen Juanlu et al.2006.LA-ICPMS dating of zircon U-Pb and tectonic significance of Honghuapu subduction-related intrusions in the west segment of northern Qinling Mountains.Geoscience,20(4):536—544,
王志浩,Bergstrom S M,甄勇毅等.2013.甘肃乎凉晚奥陶世平凉组牙形刺的新发现及其意义.微体古生物学报,30(2):123—131.Wang Zhihao,Bergstrom S M,Zhen Yongyi et al.2013.New discovery of conodonts from the Upper Ordovician Pingliang Formation of Pingliang,Cansu,China and its significance.Acta Micropalaeontologica Sinica,30(2):123—131.
吴胜和,冯增昭,张吉森.1994.鄂尔多斯地区西缘和南缘中奥陶统平凉组重力流沉积,石油与天然气地质,15(3):226—234.Wu Shenghe,Feng Zengzhao and Zhang Jisen.1994.Sedimentology of gravity flow deposits of Middle Ordovician Pingliang Formation in west and south margins of Ordos.Oil&Gas Geology,15(3);226—234.
吴素娟,李振宏,胡健民等.2014.鄂尔多斯盆地南缘赵老峪剖面奥陶系凝灰岩SHRIMP U-Pb错石定年及其地质意义.地质论评,60(4):903—912.Wu Sujuan,Li Zhenhong,Hu Jianmin et al.2014.Conformations of Ordovician sediments in south margin of Ordos Basin by SHRIMP U-Pb zircon dating of volcanic tuff interlayers and its significance.Geological Review,60(4):903—912.
杨遂正,金文化,李振宏.2006.鄂尔多斯多旋回叠合盆地形成与演化.天然气地球科学,17(4):494—498.Yang Suizheng,Jin Wenhua and Li Zhenhong.2006.Multicycle supermposed basin form and evolution of Ordos Basin.Natural Gas Geoscience,17(4):494—498.
袁卫国,赵一鸣.1996a.鄂尔多斯南部地区早古生代被动大陆边缘特征与演化.西北大学学报(自然科学版),26(5):451—454.Yuan Weiguo and Zhao Yiming.1996a.Characteristics and evolution of passive continental margin during Early Palaeozoic era in southern Ordos.Journal of Northwest University(Natural Science Edition),26(5):451—454.
袁卫国,王平.1996b.鄂尔多斯盆地南部地区的加里东运动.西安地质学院学报,18(1):36—42.Yuan Weiguo and Wang Ping.1996b.On the Caledonian movement in the southern Ordos Basin.Journal of Xi'an College of Geology,18(1):36—42.
袁效奇,苏德辰,贺静等.2014.鄂尔多斯南缘中奥陶统中的滑塌构造及其地震成因.地质论评,60(3):529—540.Yuan Xiaoqi,Su Dechen,He Jing et al.2014.The slump structures in the Middle Ordovician on the southern margin of Ordos Basin and their seismic origin.Geological Review,60(3):529—540.
赵姣,陈丹玲,谭清海等.2012.北秦岭东段二郎坪群火山岩锆石的LA.ICP-MS U-Pb定年及其地质意义.地学前缘,19(4):118—125.Zhao Jiao,Chen Danling,Tan Qinghai et al.2012.Zricon LA-ICP-MS U-Pb dating of basic volcanics from Erlangping Group of the North Qinling,eastern Qingling Mountains and its geological implications.Earth Science Frontiers,19(4);118—125.
张长厚,徐德斌,张维杰等.2004.同构造沉积分析反演逆冲推覆构造变形过程——燕山东段凌源南部中生代逆冲构造变形过程研究.地学前缘,11(3):227—243.Zhang Changhou,Xu Debin,Zhang Weijie et al.2004.Synteetonic sedimentation analysis applied to the reconstruction of the thrusting deformation process:An example from the Mesozoic thrust tectonics in eastern Yanshan orogenic belt,south of Lingyuan City,Western Liaoning Province.Earth Science Frontiers,11(3):227—243.
张成立,刘良,王涛等.2013.北秦岭早古生代大陆碰撞过程中的花岗岩浆作用.科学通报,58(23):2323—2329.Zhang Chengli,Liu Liang,Wang Tao et al.2013.Granitic magmatism related to Early Paleozoic continental collision in North Qinling.Chinese Science Bulletin,58(35):4405—4410.
周鼎武,翦万筹.1989.渭北西部地区加里东构造带变形特征及其地质意义.西北大学学报(自然科学版),19(4):93—101.Zhou Dingwu and Jian Wanchou.1989.The Caledonian fold and fault zone in the area northwest of the Weihe River and geologic significance.Journal of Northwest University{Natural Science Edition),19(4);93—101.
Ludwig K R.2001.User's Manual for Isoplot/Ex Rev.2.49;A Geochronological Toolkit for Microsoft Excel,Berkeley:Berkeley Geochronological Centre Special Publication.1—55.
Sircombe K N.1999.Tracing provenance through the isotope ages of littoral and sedimentary detrital zircon,eastern Australia.Sedimentary Geology,124(1):47—67.
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