河南商城地区石门冲组时代归属及其构造背景
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摘要
分布于桐柏—大别造山带北缘的石门冲组,由一套片岩、石英岩、大理岩等变质岩系组成,厚约1000 m。该地层的时代、构造归属一直存在较大争议。通过岩石组合、碎屑锆石同位素年代学和地球化学研究,进一步明确了石门冲组地层时代,恢复了原岩类型和沉积环境。最年轻的碎屑锆石年龄为449±12 Ma(YSG),表明石门冲组属于上奥陶统凯迪阶(钱塘江阶)。原岩主要为石英砂岩—长石砂岩—岩屑砂岩—页岩—白云岩组合,形成于滨-浅海环境。碎屑锆石最小年龄、年代相和沉积环境可以与佛子岭群下部祥云寨组相对比,应该属于原商城群的一部分。石门冲组形成于被动大陆边缘构造背景,物源区主要为类似于北秦岭奥陶纪岛弧、新元古代的扬子基底以及秦岭地块的中元古代基底等。
Shimenchong Formation in the northern margin of the Tongbai-Dabie orogenic belt is composed of a series of metamorphic rocks such as schist, quartzite and marble, which is about 1000 m thick. However, there has been a great deal of controversy about the age and structural attribution of the formation. Through the study of rock assemblages, detrital zircon geochronology and geochemistry, this paper further confirms the stratigraphic age of the Shimenchong Formation, and has restored its protolith types and sedimentary environments.The youngest detrital zircon age is 449±12 Ma(YSG), indicating that the Shimenchong Formation belongs to the Upper Ordovician Katian. The protolith is mainly composed of quartz sandstone-feldspar sandstone-lithic sandstone-shale-dolomite, which was formed in littoral environment. The minimum age of detrital zircon, facies and sedimentary environment of the Shimenchong Formation can be compared with the Xiangyunzhai Formation of Fozilin Group, which should be a part of the original Shangcheng Group. Shimenchong Formation formed in the tectonic setting of passive continental margin with the sediments from the Ordovician island arc of the North Qinling area, Neoproterozoic basement of the Yangtze Block and Middle Proterozoic basement of the Qinling massif, etc.
Shimenchong Formation in the northern margin of the Tongbai-Dabie orogenic belt is composed of a series of metamorphic rocks such as schist, quartzite and marble, which is about 1000 m thick. However, there has been a great deal of controversy about the age and structural attribution of the formation. Through the study of rock assemblages, detrital zircon geochronology and geochemistry, this paper further confirms the stratigraphic age of the Shimenchong Formation, and has restored its protolith types and sedimentary environments.The youngest detrital zircon age is 449±12 Ma(YSG), indicating that the Shimenchong Formation belongs to the Upper Ordovician Katian. The protolith is mainly composed of quartz sandstone-feldspar sandstone-lithic sandstone-shale-dolomite, which was formed in littoral environment. The minimum age of detrital zircon, facies and sedimentary environment of the Shimenchong Formation can be compared with the Xiangyunzhai Formation of Fozilin Group, which should be a part of the original Shangcheng Group. Shimenchong Formation formed in the tectonic setting of passive continental margin with the sediments from the Ordovician island arc of the North Qinling area, Neoproterozoic basement of the Yangtze Block and Middle Proterozoic basement of the Qinling massif, etc.
引文
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王志浩,Bergstrom S M,马譞,宋妍妍,张元动.2015.湖北宜昌远安真金和界岭奥陶系牯牛组顶部的牙形刺及其地层意义.微体古生物学报,32(3):233-242.
徐先兵.2011.武夷山地区显生宙构造变形与年代学研究.南京大学.1-136.
郑永飞,张少兵.2007.华南前寒武纪大陆地壳的形成和演化.科学通报,52(1):1-10.
Bhatia M R.1983.Plate tectonics and geochemical composition of sandstones.Journal of Geology,91(6):611-627.
Bhatia M R,Crook A W.1986.Trace elements characteristics of graywackes and tectonic setting discrimination of sedimentary basins.Contributions to Mineralogy and Petrology,92(2):181-193.
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Herron M M.1988.Geochemical classification of terrigenous sands and shales from core or log data.Journal of Sedimentary Research,58(5):820-829.
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Li R W,Li S Y&Jin F Q,2004.Provenance of Carboniferous sedimentary rocks in the northern margin of Dabie Mountains,central China and the tectonic significance:Constraints from trace elements,mineral chemistry and SHRIMP dating of zircons.Sedimentary Geology,166:245-264.
Mclennan S M,Bock B,Compston W,Hemming S R&McDaniel D K.2001.Detrital zircon geochronology of Taconlian and Acadian an Foreland sedimentary rocks in New England.Journal of Sedimentary Research,71(2):305-317.
Nelson D R.2001.An assessment of the determination of depositional ages for Prccamhrian elastic sedimentary rocks by U-Pb dating of detrital zircons.Sedimentary Geology.141-142:37-60.
Ross G M,Parrish P R&Winston D.1992.Provenance and U-Pb geochronology of the Mesoproterozoic Belt Supergroup(northwestern United States):Implications for age of depositional and pre-Panthalassa plate reconstructions.Earth and Planetary Science Letters,113(1-2):57-76.
Sun W D,Li S G,Chen Y D&Li Y J.2002.Timing of Synorogenic Granitoids in the South Qinling,Central China:Constraints on the Evolution of the Qinling-Dabie Orogenic Belt.Journal of Geology,110(4):457-468.
Tarney J,Dalziel W D&De Witt M.1976.Marginal basin‘Rocas Verdes’complex from S.Chile:a model for Archaean greenstone belt formation//Windley B F ed.The Early History of the Earth,131-146.
Tucker R T,Roberts E M&Hu Y.2013.Detrital zircon age constraints for the Winton Formation,Queensland:Contextualizing Australia’s Late Cretaceous dinosaur faunas.Gondwana Research,24(2):767-779.
丁见广,张保平,申开洪.2009.河南商城石门冲岩组的归属.世界地质,18(4):438-444.
河南区调队.1980.1︰20万商城幅区域地质调查报告.1-264.
河南区调队.1994.1︰5万上石桥、段集幅区域地质调查报告.1-189.
河南省地质矿产厅.1997.河南省岩石地层.中国地质大学出版社.1-299.
河南省地质十队.1976.商城石门冲磷矿普查报告.1-156.
李双应,稽在飞,王松,程成,郭立翔,杨栋栋,牛浩.2014a.华北地块南缘(霍邱-固始地区)晚石炭世地层的发现及其大地构造意义.地质科学,49(2):608-617.
李双应,程成,王松,彭亮,稽在飞,杨栋栋.2014b.华北地台南缘霍邱安阳山地区八公山群地层时代归属(青白口纪):来自碎屑锆石年代学的制约术.科学通报,59(9):803-808.
刘印环,杜凤军,刘振宏,刘品德.1995.河南省“商城群”中晚奥陶世化石的发现及其意义.中国区域地质,2:18.
陆松年,陈志宏,相振群,李怀坤,李惠民,宋彪.2006.秦岭岩群副变质岩碎屑锆石年龄谱及其地质意义探讨.地学前沿,13(6):303-310.
裴放,王凌云.2006.东秦岭古生代生物古地理,古地理学报,8(1):1-15.
王世锋,黄少瑛,徐备.2003.北淮阳区地层研究进展.地质科技情报,22(1):29-33.
王志浩,Bergstrom S M,马譞,宋妍妍,张元动.2015.湖北宜昌远安真金和界岭奥陶系牯牛组顶部的牙形刺及其地层意义.微体古生物学报,32(3):233-242.
徐先兵.2011.武夷山地区显生宙构造变形与年代学研究.南京大学.1-136.
郑永飞,张少兵.2007.华南前寒武纪大陆地壳的形成和演化.科学通报,52(1):1-10.
Bhatia M R.1983.Plate tectonics and geochemical composition of sandstones.Journal of Geology,91(6):611-627.
Bhatia M R,Crook A W.1986.Trace elements characteristics of graywackes and tectonic setting discrimination of sedimentary basins.Contributions to Mineralogy and Petrology,92(2):181-193.
Dickinson W R&Gehrels G E.2009.Use of U-Pb ages of detrital zircons to infer maximum depositional ages of strata:A test against a Colorado Plateau Mesozoic database.Earth and Planetary Science Letters,288(1-2):115-125.
Herron M M.1988.Geochemical classification of terrigenous sands and shales from core or log data.Journal of Sedimentary Research,58(5):820-829.
Jones J V,Connelly J N,Karlstrom K E.2009.Age,provenance,and tectonic setting of Paleoproterozoic quartzite successions in the southwestern United States.Geological Society of America Bulletin,121(1-2):247-264.
Li R W,Li S Y&Jin F Q,2004.Provenance of Carboniferous sedimentary rocks in the northern margin of Dabie Mountains,central China and the tectonic significance:Constraints from trace elements,mineral chemistry and SHRIMP dating of zircons.Sedimentary Geology,166:245-264.
Mclennan S M,Bock B,Compston W,Hemming S R&McDaniel D K.2001.Detrital zircon geochronology of Taconlian and Acadian an Foreland sedimentary rocks in New England.Journal of Sedimentary Research,71(2):305-317.
Nelson D R.2001.An assessment of the determination of depositional ages for Prccamhrian elastic sedimentary rocks by U-Pb dating of detrital zircons.Sedimentary Geology.141-142:37-60.
Ross G M,Parrish P R&Winston D.1992.Provenance and U-Pb geochronology of the Mesoproterozoic Belt Supergroup(northwestern United States):Implications for age of depositional and pre-Panthalassa plate reconstructions.Earth and Planetary Science Letters,113(1-2):57-76.
Sun W D,Li S G,Chen Y D&Li Y J.2002.Timing of Synorogenic Granitoids in the South Qinling,Central China:Constraints on the Evolution of the Qinling-Dabie Orogenic Belt.Journal of Geology,110(4):457-468.
Tarney J,Dalziel W D&De Witt M.1976.Marginal basin‘Rocas Verdes’complex from S.Chile:a model for Archaean greenstone belt formation//Windley B F ed.The Early History of the Earth,131-146.
Tucker R T,Roberts E M&Hu Y.2013.Detrital zircon age constraints for the Winton Formation,Queensland:Contextualizing Australia’s Late Cretaceous dinosaur faunas.Gondwana Research,24(2):767-779.