高校地质学报2017，Vol.23Issue(3)：373-382,10.DOI:10.16108/j.issn1006-7493.2017066
南海洋脊抽吸作用对其周边新生代玄武质岩浆活动的影响
Influence of Ridge Suction on Cenozoic Basaltic Magmatism in the Surroundings of the South China Sea
摘要
Abstract
Ridge suction triggered by ridge-plume interaction has been documented to generate enriched mid-ocean ridge basalts,some oceanic islands and seamounts.However,it remains unclear whether a similar process may apply in settings of an opening marginal sea and basaltic magmatism in its surrounding areas.The South China Sea (SCS) basin,which has been actively spreading between ～32 and 16 Ma,is one of the largest marginal basins that spatially associated with voluminous asthenosphere-derived basalt.It is thus an ideal case for studying this unresolved question.Here,we present new age data for Cenozoic basalts from Zhejiang province,which are basalts that erupted relatively distally from the SCS spreading center.Basalts in Yuyao County of Zhejiang province have predominantly erupted from the Oligocene to early Miocene (32.2 ～21.7 Ma),and thus formed during active spreading (syn-spreading) of SCS basin.This is striking,as most erupted intraplate basalts in the surroundings of SCS basin have formed following the cessation of the SCS basin.Using published age data and our new results,we can establish that syn-spreading basaltic magmatism in southeastern China is gradually increased in provinces that are relatively distant to the spreading center.The temporal and spatial distribution can be explained by ridge-suction,where upwelling mantle flows were focused towards the SCS spreading center.The presence of synspreading basalts in Zhejiang province as well as in the neighboring Jiangsu and Anhui provinces indicates that the mantle flows beneath this area was not significantly affected by the suction of the SCS spreading.关键词
洋脊抽吸作用/板内玄武岩/边缘海盆地/中国南海/K-Ar定年Key words
ridge suction/intraplate basalt/marginal sea/South China Sea/K-Ar dating分类
天文与地球科学引用本文复制引用
曾罡,郑丽波,陈立辉,刘建强,张欢,张甬江,施金华..南海洋脊抽吸作用对其周边新生代玄武质岩浆活动的影响[J].高校地质学报,2017,23(3):373-382,10.基金项目
国家自然科学基金(41672048) （41672048）
余姚四明山地质公园科研项目(四明山古夷平面地质地貌研究) （四明山古夷平面地质地貌研究）
中国地震局地质研究所地震动力学国家重点实验室(LED2016B01)联合资助 （LED2016B01）
