鄂北大洪山地区～817Ma洋岛玄武岩的发现及意义
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摘要
最新地质调查发现鄂北大洪山地区存在晋宁期的俯冲增生杂岩,其主体以一套弧前碎屑岩(复理石)为基质,夹大量白云岩、砾岩、硅泥质岩、辉长岩、辉绿岩、玄武岩等岩块,岩块与基质、岩块与岩块之间以断层接触。杂岩中大量的镁铁质岩岩块可能形成于洋中脊、洋内弧、洋岛等不同类型与洋盆演化相关的构造环境,首次报道绿林地区杂岩中一套呈岩块产出的洋岛碱性玄武岩。地球化学方面,绿林地区玄武岩具低K_2O、高TiO_2、Nb/Y=0.88~1.06、轻稀土元素强烈富集、重稀土元素明显亏损等特点,整体与夏威夷洋岛碱性玄武岩的地球化学特征基本一致。绿林玄武岩LA-ICP-MS锆石U-Pb测年结果显示,17个测点加权平均年龄为(817.1±7.2)Ma(MSWD=3.3),代表绿林玄武岩的形成年龄。因此绿林玄武岩可能代表晋宁期的洋岛碱性玄武岩残块,成岩岩浆来源于富集地幔。绿林洋岛碱性玄武岩与大洪山地区其他洋岛玄武岩类岩石组合可能同是洋盆消减过程中的洋壳物质残余,不同类型洋岛玄武岩的出现是洋盆演化阶段性、复杂性的体现,这些岩石建造的厘定为大洪山存在晋宁期缝合带的观点提供了强有力的证据。
Jingningian subduction-accretionary complex was discovered during the latest field geological survey in the Dahongshan region,Hubei Province.The subject of the accretionary complex is a suit of clastic rocks assemblage formed in the fore arc(named flysch),which consists of matrix strata,and a large number of exotic blocks(i.e.dolomite,conglomerate,silicon argillaceous rock,gabbro,diabase,basalt etc.)mixed in the clastic rocks.Faulted contact is extensively developed between the matrix strata and the exotic blocks,or different types of tectonic blocks.The accretionary complex thrusted onto the Dagushi Group from north to south in the form of nappe structure,and both of them were unconformably covered by the continental facies sedimentation of Nanhua Liantuo Formation.The tectonic setting of massive mafic rock blocks in the accretionary complex varies and is likely to include some special geographical positions related to the evolution of old ocean like mid-oceanic ridges,intra-ocean arc and ocean island.In this paper,we first reported the ocean island alkaline basalt blocks in the complex from Lulin region.Whole-rock major element analyses of Lulin basalts show features of a set of alkaline basalt,i.e.low K_2O,high TiO_2,δ average 5.17(>3.3)and Nb/Y=0.88-1.06.In trace element geochemistry.This set of basalt shows strong enrichment in light rare earth elements(LREE),and depletion in heavy rare earth elements(HREE)without obvious negative Eu anomaly,which are similar to typical OIB.Moreover,the enrichment in large ion lithophile elments(LILE)like Rb,Ba,Sr,and K and high field-strength element(HFSE)like Nb and Ta also shows features of OIB.17 U-Pb zircon dating spots by LA-ICP-MS with concordance higher than 90%,showing weighted mean age of(817.1±7.2)Ma(MSWD=3.3),and representing the formation time of the oceanic island basalt from Lulin.Therefore,the Lulin basalt maybe fragments of Jingningian oceanic island alkaline basalt,and the parental magma derived from the enriched mantle source.Both Lulin ocean island alkaline basalts and other types of ocean basalt assemblage in the Dahongshan region maybe the remains of oceanic crust during old Jingningian ocean closed.The appearance of multitudinous ocean basalt reflects multi-stages and complicacy of ocean basin evolution,which adds powerful proof to the definition of Dahongshan Jingningian suture zone.
Jingningian subduction-accretionary complex was discovered during the latest field geological survey in the Dahongshan region,Hubei Province.The subject of the accretionary complex is a suit of clastic rocks assemblage formed in the fore arc(named flysch),which consists of matrix strata,and a large number of exotic blocks(i.e.dolomite,conglomerate,silicon argillaceous rock,gabbro,diabase,basalt etc.)mixed in the clastic rocks.Faulted contact is extensively developed between the matrix strata and the exotic blocks,or different types of tectonic blocks.The accretionary complex thrusted onto the Dagushi Group from north to south in the form of nappe structure,and both of them were unconformably covered by the continental facies sedimentation of Nanhua Liantuo Formation.The tectonic setting of massive mafic rock blocks in the accretionary complex varies and is likely to include some special geographical positions related to the evolution of old ocean like mid-oceanic ridges,intra-ocean arc and ocean island.In this paper,we first reported the ocean island alkaline basalt blocks in the complex from Lulin region.Whole-rock major element analyses of Lulin basalts show features of a set of alkaline basalt,i.e.low K_2O,high TiO_2,δ average 5.17(>3.3)and Nb/Y=0.88-1.06.In trace element geochemistry.This set of basalt shows strong enrichment in light rare earth elements(LREE),and depletion in heavy rare earth elements(HREE)without obvious negative Eu anomaly,which are similar to typical OIB.Moreover,the enrichment in large ion lithophile elments(LILE)like Rb,Ba,Sr,and K and high field-strength element(HFSE)like Nb and Ta also shows features of OIB.17 U-Pb zircon dating spots by LA-ICP-MS with concordance higher than 90%,showing weighted mean age of(817.1±7.2)Ma(MSWD=3.3),and representing the formation time of the oceanic island basalt from Lulin.Therefore,the Lulin basalt maybe fragments of Jingningian oceanic island alkaline basalt,and the parental magma derived from the enriched mantle source.Both Lulin ocean island alkaline basalts and other types of ocean basalt assemblage in the Dahongshan region maybe the remains of oceanic crust during old Jingningian ocean closed.The appearance of multitudinous ocean basalt reflects multi-stages and complicacy of ocean basin evolution,which adds powerful proof to the definition of Dahongshan Jingningian suture zone.
引文
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