地学前缘 ›› 2011, Vol. 18 ›› Issue (1): 9-14.

• 论文 • 上一篇    下一篇

大别—苏鲁造山带、华南晚中生代花岗岩时空分布及应力场对比

丁汝鑫,周祖翼   

  1. 1中山大学 地球科学系, 广东 广州 510275
    2广东省地质过程与矿产资源探查重点实验室, 广东 广州 510275
    3同济大学 海洋地质国家重点实验室, 上海 200092
  • 收稿日期:2010-11-30 修回日期:2010-12-08 出版日期:2011-01-15 发布日期:2011-01-15
  • 作者简介:丁汝鑫(1978—),男,博士,海洋地质学专业,从事构造地质学与大地构造研究。Email: dingrux@mail.sysu.edu.cn
  • 基金资助:

    中山大学青年教师起步资助计划(321103181401);广东省自然科学基金重点项目(10251027501000019);中国博士后科学基金资助项目(20090450536)

A comparison between the Late Mesozoic DabieSulu orogenic belt and South China in terms of their granite spatialtemporal distributions and stress fields.

  1. 1Department of Earth Sciences, Sun YatSen University, Guangzhou 510275, China
    2Guangdong Province Key Lab of Geological Process and Mineral Resource Investigation, Guangzhou 510275, China
    3State Key Laboratory of Marine Geology, Shanghai 200092, China
  • Received:2010-11-30 Revised:2010-12-08 Online:2011-01-15 Published:2011-01-15

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摘要：

花岗岩原地重熔学说为解释华南晚中生代(晚侏罗世—早白垩世)花岗岩时空分布的大地构造成因提供了一种新的视角。而通过对比可以发现,大别—苏鲁造山带及其以北附近区域(尤其是苏鲁造山带及其以北附近区域)与华南晚中生代花岗岩时空分布规律及应力场具有高度的相似性和一致性,即花岗岩展布方向以北东向为主,从北西到南东方向由老变新;而且同时受古太平洋板块向欧亚大陆高速俯冲的应力场控制。因此基于该学说可以推出两者极有可能由同种原因形成,即由古太平洋板块对欧亚板块俯冲作用造成。由古太平洋板块俯冲所引发的板块联动效应导致华南板块与华北板块之间产生摩擦,进而使地壳温度升高,形成花岗岩浆层。随着板块俯冲速率的变化,花岗岩重熔界面位置也发生迁移,致使晚中生代花岗岩呈现自北西向南东变新的趋势(至少苏鲁造山带应该如此)。

关键词: 大别—苏鲁造山带, 华南, 原地重熔学说

Abstract:

The insitu remelting theory of granite opens a new perspective for the study of the tectonic cause of the spatial and temporal distribution of the Late Mesozoic (Late JurassicEarly Cretaceous) granite in South China. By comparison, we found that there is a high degree of similarity and consistency in the spatial and temporal distribution of granite and the stress field in the Late Mesozoic between the DabieSulu orogenic belt and its north vicinity (especially the Sulu orogenic belt and its north vicinity) and South China. That is, the granite distribution is mainly along the NE direction, turns from old to new from NW to SE, and is under the control of the same stress field caused by the highspeed subduction of the paleoPacific plate towards the Eurasia continent. On the basis of this theory, we may conclude that the Late Mesozoic (Late JurassicEarly Cretaceous) granite of the DabieSulu orogenic belt and its north vicinity and the Late Mesozoic (Late JurassicEarly Cretaceous) granite of South China were very likely formed by the same event, that is, the subduction of the paleoPacific plate towards the Eurasia continent. The linkage effects between the plates caused by the subduction of the paleoPacific plate led to the friction between the South China plate and the North China plate, and as a result, the temperature of the crust increased and the granite magma layer formed. With the change of subduction speed, the position of the granite remelting interface moved and thus brought about the tendency that the Late Mesozoic granite became newer from NW to SE (at least the Sulu orogenic belt seems to be like this).

Key words: DabieSulu orogenic belt, South China, insitu remelting theory

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