鄂尔多斯盆地早白垩世构造热事件形成动力学背景及其对油气等多种矿产成藏(矿)期的控制作用
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RenZL,QiK,LiuRC,CuiJP,ChenZP,ZhangYY,YangGL andMaQ2020DynamicbackgroundofEarly CretaceoustectonicthermaleventsanditscontrolonvariousmineralaccumulationssuchasoilandgasintheOrdosBasin ActaPetrologicaSinica,36(4):1213-1234,doi:1018654/10000569/20200415
本文受 国 家 自 然 科 学 基 金 重 点 项 目 (41630312)、“十 三 五 ”国 家 重 大 专 项 (2017ZX05005002008)、国 家 重 点 研 发 计 划 项 目 (2017YFC0603106)和陕西省二氧化碳封存与提高采收率重点实验室课题联合资助. 第一作者简介:任战利,男,1961年生,研究员,博士生导师,长期从事盆地构造热演化史与油气成藏评价研究,Email:renzhanl@nwu. edu.cn
1214
ActaPetrologicaSinica 岩石学报 2020,36(4)
andwesternNorthChinaCratonarecontrolledbytheEarlyCretaceoustectoniceventandthedeepthermalbackgroundofthe lithosphericextensionandthinning,themainaccumulationandminingperiodsareallEarlyCretaceous,andtheaccumulationand mineralizationhaveexplosiveandsimultaneouscharacteristics Keywords Geothermalgradient;Lithosphericthickness;Tctonicthermalevent;Thermallithosphericthickness;Lithospheric thinning;Igneousrock;Accumulationandmineralizationperiod;OrdosBasin;NorthChinaCraton
10000569/2020/036(04)121334 ActaPetrologicaSinica 岩石学报
doi:1018654/10000569/20200415
鄂尔多斯盆地早白垩世构造热事件形成动力学背景 及其对油气等多种矿产成藏(矿)期的控制作用
任战利1,2,3 祁凯1 刘润川1 崔军平1 陈志鹏1 张圆圆1 杨桂林1 马骞1 RENZhanLi1,2,3,QIKai1,LIURunChuan1,CUIJunPing1,CHENZhiPeng1,ZHANGYuanYuan1,YANGGuiLin1andMAQian1
Abstract TheexistenceoflithosphericthinningintheEarlyCretaceousofEarlyMesozoicinthecentralandwesternNorthChina CratonisamajorgeologicalproblemofwidespreadconcerninthegeosciencesBasedontheauthor’sresearchonthetectonicthermal historyoftheOrdosBasinovertheyears,theauthorhascollectedtheachievementsandprogressofpreviousstudiesinrecentyears, andthecurrentgeothermalfield,crustalstructure,tectonicthermalevents,anddeepthermallithosphericthickness,EarlyCretaceous igneousrockactivityperiod,tectonicthermaleventformationmechanism andtherelationshipbetweentectonicthermaleventsand accumulationandmineralizationofvariousmineralarediscussedThecurrentgeothermalgradientandgeothermalflowintheOrdos BasinaremediumtemperaturetypebasinsThecurrentgeothermalfieldiscontrolledbythethickercrustandlithosphereThroughthe analysisoftectonicsetting,paleotemperaturerestoration,igneousrockactivityandthermallithosphericthicknessrestoration,itisfound thattheShanxiandtheOrdosbasinsinthewestoftheTaihangMountainsintheEarlyCretaceousareinthetensionbackground,and theEarlyCretaceousgeothermalgradientishigh,andtherearepaleotemperatureanomaliesandtectonicthermaleventThethickness ofthethermallithosphereintheEarlyCretaceousissignificantlythinnerthanthethicknessofthecurrentlithosphereinOrdosBasin, indicatingthatthewesternboundaryoflithosphericthinningintheNorthChinablockintheEarlyCretaceouscanbepushedtothe OrdosBasinTheformationageofigneousrocksinmarginalzoneoftheOrdosBasininthecentralofNorthChinaCraton,inShanxi blockofthecentralblockoftheNorthChinaCraton,andinthesouthernmarginofthecentralandwesternonNorthChinaCratonare thesameTheagesofmagmaintrusionanderuptionaremainlyconcentratedin138~108Ma,whichisreflectedintheexistenceofa relativelyintensetectonicthermaleventoftheEarlyCretaceousinthemiddleandwesternpartofNorthChinaCratonGeochemical analysisofigneousrocksindicatesthatthesourceofigneousrocksismantle,reflectingthelithosphereinthetensilebackgroundThe timeofintensethermaleventsoftheEarlyCretaceouscoincidedwiththepeakageofthelithosphericthinningintheNorthChina Craton,indicatingthatthelithosphericthinningeffectoftheNorthChinaCratoniswidespreadinthecentralandwesternNorthChina CratonThefundamentalcauseoftheEarlyCretaceoustectonicthermaleventintheMesozoicEraistheenhancedthermalactivityin thedeeplithosphereoftheOrdosBasin,theupwellingofthedeepasthenosphere,thethinningofthelithosphereThroughtheanalysis ofthecorrespondencebetweenmetallogenicmineralization(reservoir)agesandthermalevents,suchasoilandgas,coal,uranium, etcitisfoundthattheformationofoilandgas,coal,uraniummineralsintheOrdosbasinandthemetallogenicmineralsinthecentral
1西北大学大陆动力学国家重点实验室,西安 710069 2西北大学地质学系,西安 710069 3陕西省二氧化碳封存与提高采收率重点实验室,西安 710075 1StateKeyLaboratoryofContinentalDynamics,NorthwestUniversity,Xi’an710069,China 2DepartmentofGeology,NorthwestUniversity,Xi’an710069,China 3ShaanxiKeyLaboratoryofCarbonDioxideStorageandEnhancedOilRecovery,Xi’an710075,China 20181111收稿,20200410改回
摘 要 华北克拉通中西部中生代晚期早白垩世是否存在岩石圈减薄是地学界普遍关注的重大地质问题。本文在作者多 年来对鄂尔多斯盆地构造热演化史研究的基础上,充分收集了近年来前人研究的成果及进展,对鄂尔多斯盆地现今地温场、 地壳结构、构造热事件、深部热岩石圈厚度、早白垩世火成岩活动期次、构造热事件形成机理及构造热事件与多种矿产成藏成 矿关系方面进行探讨。鄂尔多斯盆地现今地温梯度及大地热流中等,属中温型盆地,现今地温场受现今地壳、岩石圈厚度较 厚控制。通过对构造背景、古地温恢复、火成岩活动及热岩石圈厚度恢复等资料分析发现早白垩世太行山以西的山西地块及 鄂尔多斯盆地处于拉张背景,早白垩世地温梯度高,存在古地温异常及热事件。早白垩世鄂尔多斯盆地热岩石圈厚度明显较 现今岩石圈厚度薄,表明华北克拉通中生代晚期以来岩石圈减薄的西界可推到鄂尔多斯盆地。华北克拉通中西部鄂尔多斯 盆地周缘、华北克拉通中部山西地块、华北克拉通中西部南缘早白垩世火成岩形成时间相同,岩浆侵入和喷出的时代主要集 中在 138~108Ma,反映在燕山晚期早白垩世华北克拉通中西部存在一期较为强烈的热事件。火成岩地球化学分析表明火成 岩来源为地幔,反映岩石圈处于拉张背景。早白垩世热事件发生的时间与华北克拉通岩石圈减薄的峰期年龄相一致,表明华 北克拉通岩石圈减薄作用在华北克拉通中西部广泛存在。早白垩世构造热事件发生的根本原因在于鄂尔多斯盆地岩石圈深 部热活动增强,深部软流圈物质上涌,岩石圈厚度减薄。通过对油气、煤、铀等金属矿产成矿(藏)时代与热事件的对应关系分 析发现鄂尔多斯盆地油气、煤、铀矿产及华北克拉通中西部金属矿产的形成受控于早白垩世构造热事件及岩石圈拉张减薄的 深部热背景,主要成藏(矿)期均为早白垩世,成藏、成矿具有爆发式及同时性特点。 关键词 地温梯度;岩石圈厚度;构造热事件;热岩石圈厚度;岩石圈减薄;火成岩;成藏(矿)期;鄂尔多斯盆地;华北克拉通 中图法分类号 P3142
本文受 国 家 自 然 科 学 基 金 重 点 项 目 (41630312)、“十 三 五 ”国 家 重 大 专 项 (2017ZX05005002008)、国 家 重 点 研 发 计 划 项 目 (2017YFC0603106)和陕西省二氧化碳封存与提高采收率重点实验室课题联合资助. 第一作者简介:任战利,男,1961年生,研究员,博士生导师,长期从事盆地构造热演化史与油气成藏评价研究,Email:renzhanl@nwu. edu.cn
1214
ActaPetrologicaSinica 岩石学报 2020,36(4)
andwesternNorthChinaCratonarecontrolledbytheEarlyCretaceoustectoniceventandthedeepthermalbackgroundofthe lithosphericextensionandthinning,themainaccumulationandminingperiodsareallEarlyCretaceous,andtheaccumulationand mineralizationhaveexplosiveandsimultaneouscharacteristics Keywords Geothermalgradient;Lithosphericthickness;Tctonicthermalevent;Thermallithosphericthickness;Lithospheric thinning;Igneousrock;Accumulationandmineralizationperiod;OrdosBasin;NorthChinaCraton
10000569/2020/036(04)121334 ActaPetrologicaSinica 岩石学报
doi:1018654/10000569/20200415
鄂尔多斯盆地早白垩世构造热事件形成动力学背景 及其对油气等多种矿产成藏(矿)期的控制作用
任战利1,2,3 祁凯1 刘润川1 崔军平1 陈志鹏1 张圆圆1 杨桂林1 马骞1 RENZhanLi1,2,3,QIKai1,LIURunChuan1,CUIJunPing1,CHENZhiPeng1,ZHANGYuanYuan1,YANGGuiLin1andMAQian1
Abstract TheexistenceoflithosphericthinningintheEarlyCretaceousofEarlyMesozoicinthecentralandwesternNorthChina CratonisamajorgeologicalproblemofwidespreadconcerninthegeosciencesBasedontheauthor’sresearchonthetectonicthermal historyoftheOrdosBasinovertheyears,theauthorhascollectedtheachievementsandprogressofpreviousstudiesinrecentyears, andthecurrentgeothermalfield,crustalstructure,tectonicthermalevents,anddeepthermallithosphericthickness,EarlyCretaceous igneousrockactivityperiod,tectonicthermaleventformationmechanism andtherelationshipbetweentectonicthermaleventsand accumulationandmineralizationofvariousmineralarediscussedThecurrentgeothermalgradientandgeothermalflowintheOrdos BasinaremediumtemperaturetypebasinsThecurrentgeothermalfieldiscontrolledbythethickercrustandlithosphereThroughthe analysisoftectonicsetting,paleotemperaturerestoration,igneousrockactivityandthermallithosphericthicknessrestoration,itisfound thattheShanxiandtheOrdosbasinsinthewestoftheTaihangMountainsintheEarlyCretaceousareinthetensionbackground,and theEarlyCretaceousgeothermalgradientishigh,andtherearepaleotemperatureanomaliesandtectonicthermaleventThethickness ofthethermallithosphereintheEarlyCretaceousissignificantlythinnerthanthethicknessofthecurrentlithosphereinOrdosBasin, indicatingthatthewesternboundaryoflithosphericthinningintheNorthChinablockintheEarlyCretaceouscanbepushedtothe OrdosBasinTheformationageofigneousrocksinmarginalzoneoftheOrdosBasininthecentralofNorthChinaCraton,inShanxi blockofthecentralblockoftheNorthChinaCraton,andinthesouthernmarginofthecentralandwesternonNorthChinaCratonare thesameTheagesofmagmaintrusionanderuptionaremainlyconcentratedin138~108Ma,whichisreflectedintheexistenceofa relativelyintensetectonicthermaleventoftheEarlyCretaceousinthemiddleandwesternpartofNorthChinaCratonGeochemical analysisofigneousrocksindicatesthatthesourceofigneousrocksismantle,reflectingthelithosphereinthetensilebackgroundThe timeofintensethermaleventsoftheEarlyCretaceouscoincidedwiththepeakageofthelithosphericthinningintheNorthChina Craton,indicatingthatthelithosphericthinningeffectoftheNorthChinaCratoniswidespreadinthecentralandwesternNorthChina CratonThefundamentalcauseoftheEarlyCretaceoustectonicthermaleventintheMesozoicEraistheenhancedthermalactivityin thedeeplithosphereoftheOrdosBasin,theupwellingofthedeepasthenosphere,thethinningofthelithosphereThroughtheanalysis ofthecorrespondencebetweenmetallogenicmineralization(reservoir)agesandthermalevents,suchasoilandgas,coal,uranium, etcitisfoundthattheformationofoilandgas,coal,uraniummineralsintheOrdosbasinandthemetallogenicmineralsinthecentral
1西北大学大陆动力学国家重点实验室,西安 710069 2西北大学地质学系,西安 710069 3陕西省二氧化碳封存与提高采收率重点实验室,西安 710075 1StateKeyLaboratoryofContinentalDynamics,NorthwestUniversity,Xi’an710069,China 2DepartmentofGeology,NorthwestUniversity,Xi’an710069,China 3ShaanxiKeyLaboratoryofCarbonDioxideStorageandEnhancedOilRecovery,Xi’an710075,China 20181111收稿,20200410改回
摘 要 华北克拉通中西部中生代晚期早白垩世是否存在岩石圈减薄是地学界普遍关注的重大地质问题。本文在作者多 年来对鄂尔多斯盆地构造热演化史研究的基础上,充分收集了近年来前人研究的成果及进展,对鄂尔多斯盆地现今地温场、 地壳结构、构造热事件、深部热岩石圈厚度、早白垩世火成岩活动期次、构造热事件形成机理及构造热事件与多种矿产成藏成 矿关系方面进行探讨。鄂尔多斯盆地现今地温梯度及大地热流中等,属中温型盆地,现今地温场受现今地壳、岩石圈厚度较 厚控制。通过对构造背景、古地温恢复、火成岩活动及热岩石圈厚度恢复等资料分析发现早白垩世太行山以西的山西地块及 鄂尔多斯盆地处于拉张背景,早白垩世地温梯度高,存在古地温异常及热事件。早白垩世鄂尔多斯盆地热岩石圈厚度明显较 现今岩石圈厚度薄,表明华北克拉通中生代晚期以来岩石圈减薄的西界可推到鄂尔多斯盆地。华北克拉通中西部鄂尔多斯 盆地周缘、华北克拉通中部山西地块、华北克拉通中西部南缘早白垩世火成岩形成时间相同,岩浆侵入和喷出的时代主要集 中在 138~108Ma,反映在燕山晚期早白垩世华北克拉通中西部存在一期较为强烈的热事件。火成岩地球化学分析表明火成 岩来源为地幔,反映岩石圈处于拉张背景。早白垩世热事件发生的时间与华北克拉通岩石圈减薄的峰期年龄相一致,表明华 北克拉通岩石圈减薄作用在华北克拉通中西部广泛存在。早白垩世构造热事件发生的根本原因在于鄂尔多斯盆地岩石圈深 部热活动增强,深部软流圈物质上涌,岩石圈厚度减薄。通过对油气、煤、铀等金属矿产成矿(藏)时代与热事件的对应关系分 析发现鄂尔多斯盆地油气、煤、铀矿产及华北克拉通中西部金属矿产的形成受控于早白垩世构造热事件及岩石圈拉张减薄的 深部热背景,主要成藏(矿)期均为早白垩世,成藏、成矿具有爆发式及同时性特点。 关键词 地温梯度;岩石圈厚度;构造热事件;热岩石圈厚度;岩石圈减薄;火成岩;成藏(矿)期;鄂尔多斯盆地;华北克拉通 中图法分类号 P3142