摘要
自元古宙以来地球表面洋陆位置不断变化,洋的面积总比陆地面积大.分布于大陆造山带区的古缝合带是古大洋或古大陆边缘小洋盆消亡的残迹,是洋板块地层研究的主要对象.针对占中国陆域3/5面积的造山带洋板块地层分布区,提出一级(称"构造-地层大区")和二级(称"构造-地层区")构造-地层的区划准则.将洋板块地层分为对接带型和叠接带型两大类,分别对应于构造-地层大区和构造地层区.对接带型以含N-MORB型蛇绿岩为标志,是古大洋消亡的残迹;叠接带型以含SSZ型蛇绿岩为标志,是古大陆边缘小洋盆消亡的残迹.对接带内的洋脊(蛇绿岩)、洋岛海山、洋内弧等亚型建造因卷入俯冲带内被肢解,多数呈残缺不全的岩块包裹在强烈构造剪切形变的远洋细碎屑和海沟浊积岩建造(称为基质)之中,呈俯冲增生杂岩带展布,对应于构造-地层区;对某些形体巨大的亚类(巨大的洋岛海山、裂离地块、大面积的深海平原硅质岩等建造),进入海沟俯冲带内很难被完全肢解,呈逆(仰)冲地质体大面积分布,可归为构造-地层区.叠接带型可进一步划分出与弧前盆地、火山弧(含弧间和弧背盆地建造)和弧后盆地等二级构造-地层区划单元.
The paleo-position of ocean and continent has been changing on the earth since the Proterozoic and the oceanic acreage is always larger than the continent’s.A paleo-suture zone represents the remant of a paleo-ocean and is considered as the focus on the research of Ocean Plate Stratigraphy(OPS).The paper is aiming to propose the regulations for the division of tectonic-strata super regions and regions in the orogenic belts,based on OPS in China.The OPS can be subdivided into two types in China,N-MORBtype and SSZ-type,respectively corresponding to the main suture zone and subordinate suture zone.The current position for a main suture zone is roughly considered as the position of a tectonic-strata super region.A main suture zone was formed during the disappearing of a large ocean,marked by N-MORB-type ophiolite.The current position for a subordinate suture zone is roughly corresponding to the position of a tectonic-strata region.A subordinate suture zone was formed during the disappearing of a small ocean,marked by SSZ-type ophiolite and developed along the edge of a block or continent.The geological units in a main suture zone mainly consist of ophiolite,seamount and intra-oceanic arc.The positions for these units could be also generally considered as the positions of tectonic-strata regions.The geological units in a subordinate suture zone mainly consist of back-arc,inter-arc and retro-arc and for-arc basins.The positions for these units are basically considered as the positions of tectonic-strata subregions.
作者
张克信
何卫红
J.S Jin.
王嘉轩
徐亚东
张雄华
于洋
林启祥
骆满生
季军良
宋博文
寇晓虎
韩风禄
Zhang Kexin;He Weihong;J.S Jin;Wang Jiaxuan;Xu Yadong;Zhang Xionghua;Yu Yang;Lin Qixiang;Luo Mansheng;Ji Junliang;Song Bowen;Kou Xiaohu;Han Fenglu(Institute of Geological Survey,China University of Geosciences,Wuhan 430074,China;School of Earth Sciences,China University of Geosciences,Wuhan 430074,China;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences,Wuhan 430074,China;Department of Earth Sciences,University of Western Ontario,London,Ontario N6A 5B7,Canada)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2020年第7期2305-2325,共21页
Earth Science
基金
中国地质调查局项目(Nos.DD20190370,DD20190811)
国家自然科学基金项目(No.41772107)
国家重点研发计划项目(No.2016YFC0601005)。
关键词
洋板块地层
对接带
叠接带
构造-地层区划
构造地质
ocean plate stratigraphy(OPS)
main suture zone
subordinate suture zone
division of tectonic-strata region
tectonics
