班公湖-怒江洋早-中侏罗世洋内俯冲:来自洞错蛇绿岩的证据
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摘要
本文在班公湖-怒江缝合带中段洞错蛇绿岩中新厘定一套洋内俯冲成因的岩石组合,岩性以橄榄岩、堆晶岩(包括堆晶辉长岩和斜长花岗岩)、辉长岩墙、枕状熔岩和辉绿岩脉等为主。堆晶辉长岩、辉长岩墙和辉绿岩脉锆石U-Pb测年显示,它们形成于中侏罗世(172～165Ma)。辉长岩墙和辉绿岩脉地球化学和锆石Lu-Hf同位素分析显示,它们兼具N-MORB和岛弧玄武岩地球化学特征,且均来自亏损地幔源区,形成过程中受到了俯冲流体的影响。结合区域上同时期的玻安岩、高镁安山岩和钙碱性岩浆岩等资料,我们得出班公湖-怒江缝合带内保存了一套相对完整的早-中侏罗世洋内弧岩石层序,记录了班公湖-怒江洋早-中侏罗世时期的洋内俯冲事件。早-中侏罗世是班公湖-怒江洋快速消减期,洋内俯冲和洋-陆俯冲同时存在。
In this paper,a set of intra-oceanic subduction-related rock assemblage was newly found,which consists of peridotite,cumulate rocks( comprising layered gabbro and plagiogranite),gabbro dyke,pillow lava and diabase veins,in the Dong Co ophiolite in the middle segment of the Bangong-Nujiang Suture Zone( BNSZ). Zircon U-Pb analysis of the layered gabbro,gabbro dyke and diabase vein show that they are formed during the Middle Jurassic( 172 ～ 165 Ma). Geochemical analysis of the gabbro dyke and diabase vein show that they have light rare earth element( LREE) depleted chondrite-normalized REE patterns that are similar to those of mid-ocean ridge basalt( MORB),and have enrichments in the light ion lithophile elements( LILE; Rb,Ba,U,Pb and Sr),and depletions in the high field strength elements( HFSE; Th,Nb and Ta) that are similar to those of island arc basalt( IAB). The gabbro dyke and diabase vein have negative δNb values(-0. 2 ～-0. 4 and-0. 4 ～-1. 0,respectively),high positive εHf( t) values( + 16. 5 ～ + 19. 5 and + 17. 3 ～ + 22. 3,respectively),high Sr/Nd ratios( 52 ～ 114 and 34 ～ 42,respectively),and low Th/Yb ratios( 0. 04 ～ 0. 06 and 0. 05 ～ 0. 11,respectively),indicating that they were all derived from the depleted mantle source,and were affected by the subduction fluids during their formation. Combined with the Middle Jurassic boninites,high-Mg andesites and calcalkaline magmatic rocks within the BNSZ, a complete Early-Middle Jurassic intra-oceanic subduction-related rock sequence is identified,indicating that the intra-oceanic subduction of the Bangong-Nujiang oceanic lithosphere was ongoing during this period.Combined with large amounts of Early-Middle Jurassic calc-alkaline magmatic rocks on the South Qiangtang Terrane,north of the BNSZ,we conclude that the Bangong-Nujiang Ocean withered rapidly during the Early-Middle Jurassic,with the co-existence of intraoceanic subduction and ocean-continent subduction.
In this paper,a set of intra-oceanic subduction-related rock assemblage was newly found,which consists of peridotite,cumulate rocks( comprising layered gabbro and plagiogranite),gabbro dyke,pillow lava and diabase veins,in the Dong Co ophiolite in the middle segment of the Bangong-Nujiang Suture Zone( BNSZ). Zircon U-Pb analysis of the layered gabbro,gabbro dyke and diabase vein show that they are formed during the Middle Jurassic( 172 ～ 165 Ma). Geochemical analysis of the gabbro dyke and diabase vein show that they have light rare earth element( LREE) depleted chondrite-normalized REE patterns that are similar to those of mid-ocean ridge basalt( MORB),and have enrichments in the light ion lithophile elements( LILE; Rb,Ba,U,Pb and Sr),and depletions in the high field strength elements( HFSE; Th,Nb and Ta) that are similar to those of island arc basalt( IAB). The gabbro dyke and diabase vein have negative δNb values(-0. 2 ～-0. 4 and-0. 4 ～-1. 0,respectively),high positive εHf( t) values( + 16. 5 ～ + 19. 5 and + 17. 3 ～ + 22. 3,respectively),high Sr/Nd ratios( 52 ～ 114 and 34 ～ 42,respectively),and low Th/Yb ratios( 0. 04 ～ 0. 06 and 0. 05 ～ 0. 11,respectively),indicating that they were all derived from the depleted mantle source,and were affected by the subduction fluids during their formation. Combined with the Middle Jurassic boninites,high-Mg andesites and calcalkaline magmatic rocks within the BNSZ, a complete Early-Middle Jurassic intra-oceanic subduction-related rock sequence is identified,indicating that the intra-oceanic subduction of the Bangong-Nujiang oceanic lithosphere was ongoing during this period.Combined with large amounts of Early-Middle Jurassic calc-alkaline magmatic rocks on the South Qiangtang Terrane,north of the BNSZ,we conclude that the Bangong-Nujiang Ocean withered rapidly during the Early-Middle Jurassic,with the co-existence of intraoceanic subduction and ocean-continent subduction.
引文
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