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华南构造演化的基本特征
引用本文:舒良树.华南构造演化的基本特征[J].地质通报,2012,31(7):1035-1053.
作者姓名:舒良树
作者单位:南京大学内生金属矿床成矿机制研究国家重点实验室,地球科学与工程学院,江苏南京210093
基金项目:国家重大基础研究“973”项目,国家自然科学基金,%%,内生金属矿床成矿机制研究国家重点实验室项目
摘    要:华南至少经历了4期区域规模的大陆动力学过程,除新元古代和晚中生代具有活动陆缘背景外,均在板块内部发生并完成。华夏块体是一个以新元古代岩石为主体构成的前南华纪基底,不是稳定的克拉通古陆,经历了聚合-裂解-再聚合的复杂构造演化。志留纪发生的板内碰撞-拼合事件使华夏块体与扬子块体再次缝合,形成真正统一的中国南方大陆。在震旦纪—早侏罗世期间,整个华南基本处于陆内滨海-浅海-斜坡环境,内部没有切穿岩石圈的断层,没有大规模幔源岩浆和火山喷发的记录,多次构造变形与岩浆活动均在统一的华南岩石圈之上进行。经过早—中侏罗世的构造体制转换,才演化成为晚中生代西太平洋活动大陆边缘的一部分。从早到晚,华南岩石圈经历了多期、幕式的生长,以侧向增生为主(块体拼合),垂向生长为辅(岩浆上侵)。到晚中生代,在古太平洋板块俯冲和陆内伸展的背景下,形成了独特的华南盆岭构造。长期的板内构造演化和多期的花岗岩浆活动使华南具有很好的成矿条件,成为各种矿产与资源的富集区。新元古代南华纪和晚中生代晚侏罗世—早白垩世是华南最有利的成矿期,尤以后者矿种最多、储量最大。

关 键 词:板块构造  陆内造山  岩浆活动  成矿作用  构造演化  华南

An analysis of principal features of tectonic evolution in South China Block
SHU Liang-shu.An analysis of principal features of tectonic evolution in South China Block[J].Geologcal Bulletin OF China,2012,31(7):1035-1053.
Authors:SHU Liang-shu
Affiliation:State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China
Abstract:Studies suggest that at least four stages of regional-scale tectonic and magmatic events have taken place in the South China block, namely, geodynamic processes of Neoproterozoic and Late Mesozoic active continental margins, Early Paleozoic and Early Mesozoic intracontinental orogenies. The Cathaysia block was a pre-Nanhua basement consisting mainly of Neoproterozoic rocks instead of a stable old land. It experienced a complex evolution from assembly through break-up to re-assembly. The intracontinental shortening during Silurian led to the stabilization of the united South China continent. The entire South China Block was under a shore-shallow sea-slope setting, with no translithospheric fault, no regional-scale volcanism and mantle-derived magmatism in the period from Sinian to Jurassic, during which polyphase tectonic and magmatic events occurred in the united South China lithosphere. It evolved into a part of the Late Mesozoic Western Pacific active continental margin after the Early-Middle Jurassic transformation from Tethysian to Pacific tectonic regimes. The South China lithosphere experienced polyphase continental growth due to the dominant lateral accretion of block assembly accompanied by vertical growth of magma up-swarming. During the Cretaceous, the South China basin and range tectonics occurred in the western shore of the Pacific Ocean due to strong intracontinental extension caused by the northwestward subduction of the Pacific Ocean. Long-term intraplate tectonism and polystage granitic magmatism provided South China with a favorable condition of metallization, forming various large-size ore deposits and resources. Neoproterozoic Nanhua Period and Early Cretaceous were two dominant stages of metallization, with various types of ore deposits being chiefly formed in the Early Cretaceous period.
Keywords:plate tectonics  intracontinental orogeny  magmatism  metallization  tectonic evolution  South China
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