婆罗洲晚中生代岩浆弧及陆缘俯冲汇聚体制

A review of the Late Mesozoic magmatic arc in Borneo with slab subduction models

婆罗洲地处2大构造域结合部,Schwaner岩浆弧和Meratus、Lupar俯冲杂岩是其显著的地质特征,它们与晚中生代特提斯域或/和古太平洋域的板块俯冲密切相关。婆罗洲中生代地质现有研究程度不高,缺乏地质、地球化学和地球物理多学科综合研究,缺乏与周边区域地质对比研究,制约了对婆罗洲岩浆弧演变及板块俯冲体制的整体认识。关于婆罗洲晚中生代岩浆弧,或强调与特提斯洋向北西俯冲婆罗洲有关,或认为古南海向南俯冲婆罗洲有关,或作为两者联合俯冲控制的产物。前白垩纪SW婆罗洲的基底属性,或认为亲缘于华夏地块,或归属巽他大陆的东延部分,或认为是冈瓦那大陆裂解而来的外来块体。今后研究应加强海陆结合、多学科大区域综合对比,重点围绕岩浆弧、蛇绿岩和俯冲杂岩、区域大断裂和盆地沉积等内容,形成婆罗洲及邻区晚中生代陆缘汇聚体制和2大构造域关系的综合认识,也是深化认识南海中生界弧盆结构、盆地原型及其油气勘探潜力的重要环节。

Borneo is at the critical junction of two tectonic domains.The Schwaner magma arc and the Meratus and Lupar subduction complexes are the prominent features of Borneo in the Late Mesozoic,which result from the subduction of Tethys or/and paleo-Pacific domains.The current research level of Mesozoic geology in Borneo is not high.The lack of combined studies of geology,geochemistry and geophysics,and the lack of comparative studies in the region around South China Sea areas have restricted the overall understanding of Borneo’s magmatic arc evolution and slab subduction model.The Late Mesozoic magmatic arc in Borneo is either related to the northwestward subduction of the Meso-Tethys slab,or the southward subduction of the proto-South China Sea slab,or possibly both,controled by the Tethys and paleo-Pacific domains.The pre-Cretaceous tectonic affinity of SW Borneo is either with the Cathaysia block or as a fragment of the eastern Sundaland,or it may be an exotic block from the Gondwana continent.The combination from sea to land,and the multidisciplinary,regional,comprehensive,and comparative research should be strengthened in the future,focusing on magmatic arc,ophiolite,subduction complex,regional fault,and Mesozoic basins,etc.These help to trace the evolved geodynamic controls of the Late Mesozoic continental margin in Borneo by Tethys or/and paleo-Pacific slab subduction.It will deepen the regional understanding of the Late Mesozoic arc-basin system,basin prototype,and oil and gas exploration and potential in areas of the South China Sea.