海洋地质与第四纪地质2017，Vol.37Issue(6)：25-33,9.DOI:10.16562/j.cnki.0256-1492.2017.06.003
南海北部晚新生代岩浆活动的发育特征与构造意义
CHARACTERISTICS OF LATE CENOZOIC MAGMATIC ACTIVITIES ON THE NORTHERN MARGIN OF SOUTH CHINA SEA AND THEIR TECTONIC IMPLICATIONS
摘要
Abstract
The northern margin of South China Sea is characterized by unique magmatic activities.They were weak during the period of continental rifting and breakup but intense in the late Cenozoic of post-rifting stage,particularly after the cessation of seafloor spreading.In this paper,studied are the characteristics of magmatic activities in the late Cenozoic including the scale,material properties,tectonic pattern and conduit features by summarizing the previous research results of petrology,chronology and geophysics.Our results show that:(1) The Late Cenozoic basalts on the northern margin of South China Sea is a kind of oceanic island basalts (OIB),having similar isotopic distribution pattern with the typical hotspot OIB of the world;(2) The volume and scale of the submarine volcanism on the northern margin of South China Sea are comparable to the typical igneous rocks of the world;(3) The tensile faults formed during the extension and rifting of the lithosphere may provide a good conduit for the basaltic magma to move upward;(4) The dyke and dike complexes found in the sedimentary strata have the same magmatic source as the submarine volcanism;(5) Global and regional seismic tomography results show a clear deep low-speed channel,suggesting that the Late Cenozoic basaltic magmatism on the northern margin of South China Sea may be closely related to a deep mantle plume.关键词
玄武岩浆作用/地幔柱/海底火山/南海北部/晚新生代Key words
northern margin of South China Sea/basaltic magmatism/Late Cenozoic/mantle plume/submarine volcanoes分类
海洋科学引用本文复制引用
夏少红,范朝焰,孙金龙,曹敬贺,赵芳,万奎元..南海北部晚新生代岩浆活动的发育特征与构造意义[J].海洋地质与第四纪地质,2017,37(6):25-33,9.基金项目
中国科学院战略性先导科技专项(XDA13010101) （XDA13010101）
国家自然科学基金(41576041,91328206) （41576041,91328206）
广东省自然科学基金(2017A030311015) （2017A030311015）
