地学前缘 ›› 2011, Vol. 18 ›› Issue (3): 179-188.

• 论文 • 上一篇    下一篇

基于新测年资料的蓟县运动和燕山早期运动表现探讨:以深圳西部地区及东部大鹏半岛国家地质公园地区为例

梅村,康镇江,唐跃林,张崧,管福贞,龚淑云,李甘   


  1. 1. 深圳大鹏半岛国家地质公园管理处, 广东 深圳 518121
    2. 深圳市地质学会, 广东 深圳 518023
    3. 深圳地质建设工程公司,  广东 深圳 518023
  • 收稿日期:2010-09-20 修回日期:2010-10-15 出版日期:2011-05-22 发布日期:2011-05-20
  • 作者简介:梅村(1963—),男,硕士研究生,高级工程师,从事地质公园建设与管理研究。 Email:meicun@szum.gov.cn
  • 基金资助:

    深圳市人民政府深圳大鹏半岛国家地质公园古火山地质遗迹调查及研究项目(OTC0816511)

A discussion on the manifestation of Jixian movement and early Yanshanian movement in the study area based on the new dating information: Taking the Western Shenzhen and  National Geopark in Eastern Shenzhen Dapeng Peninsula as  examples.

  1. 1. Shenzhen Dapeng Peninsula National Geopark Administration Office, Shenzhen 518121, China 2. Geological Society of Shenzhen, Shenzhen 518023, China
    3. Shenzhen Geology & Construcation Engineering Company, Shenzhen 518023, China  
  • Received:2010-09-20 Revised:2010-10-15 Online:2011-05-22 Published:2011-05-20

摘要:

近3年来在深圳西部及东部大鹏半岛国家地质公园等地,笔者等参加了地质路线调查研究和取样工作,先后采集了20组岩石同位素定年样品,采用新方法锆石UPb定年激光测试法测试,其中获得7个数据集中在1 007~897 Ma,首次发现中—新元古代蓟县纪—青白口纪,并基本可以证实蓟县运动(1 400~1 000 Ma)的存在;对中生代火山岩时代较详细划分出中侏罗世及中—晚侏罗世火山岩((1569±2)Ma、(1658±29)Ma)和晚侏罗世火山岩(1419~1456 Ma),晚侏罗世晚期—早白垩世早期火山岩((131±2)~(1462±29)Ma)。所取得1658~1391 Ma的13个数据中,有11个数据集中在1463~1391 Ma,正好说明燕山运动早期(205~135 Ma)在研究区有过强烈的活动。深圳地区的蓟县运动(1 400~1 000 Ma),主要表现在中—新元古代之间曾发生过强烈的构造运动,使变质杂岩系受到强烈的挤压,发生了紧密的线型褶皱、区域变质作用和混合岩化作用;该区燕山运动可以划分为早、晚两期,并以早期运动为主。其中早期又分为1~4幕,晚期则为第5幕。强烈的构造运动可能与太平洋板块对欧亚大陆板块俯冲有关。燕山运动主要表现为褶皱断裂变动、火山喷发和岩浆侵入活动及部分地带的变质作用。根据测年新资料进行研究区主要构造运动的研究分析,对粤东莲花山区域构造带南段的同位素地质年代学,构造带的形成时间、演化历史、构造机制和动力学研究,具有较重要的实践意义。

关键词: 锆石U-Pb定年激光测试, 蓟县运动, 燕山早期运动, 深圳地区

Abstract:

The authors attended geological line survey and collected 20 rock samples for dating in the Western Shenzhen and National Geopark  in Eastern Shenzhen Dapeng Peninsula and other places in last 3 years. Using the new laser testing method of zircon UPb dating,  we obtained seven data sets focused on the range of 1007897 Ma,  and for the first time we found out the Neoproterozoic Jixian “Period”Qingbaikouan “Period”, and basically can confirm the existence of Jixian movement (14001000 Ma); The ages of the Mesozoic volcanic rocks can be further divided into the Middle Jurassic and MiddleLate Jurassic volcanic rocks (1569±2 Ma, 1658±29 Ma), the Late Jurassic volcanic rocks (14191456 Ma),  and the late Late Jurassicearly Early Cretaceous volcanic rocks (131±2 Ma1462±29 Ma)。Among the 13 data in the range of 16581391 Ma,  there are 11 data focused on the range of 14631391 Ma,  which shows the intense early Yanshanian movement (205135 Ma)in the area Shenzhen Jixian movement (14001000 Ma)mainly occurred as strong tectonic movement between the Mesoproterozoic and the Neoproterozoic; the metamorphic rocks underwent strong compression,  and close linear folds,  regional metamorphism and migmatization occurred. Yanshanian movement in the local district can be distinguished two stages,  the early and the late,  and the early movement was dominant. Meanwhile the early movement can be further divided into 14 screens and the late movement was the 5th screen. The intensely tectonic movement was related to the subduction of the Pacific plate into the Eurasian plate. The Yanshanian movement was mainly the folding and faulting,  volcanic eruptions,  magma intrusion and some areas’ metamorphism. According to new data measured in the study area we carried out the analyses of the main tectonic movements; for the southern tectonic belt of the east Guangdong Lotus Hill area,  we have studied its isotopic geochronology,  the time of its formation,  its evolutionary history,  and its structural mechanisms and kinetics; these studies are of important practical significance.

Key words:  , zircon UPb dating with laser testing; Jixian movement; early Yanshan movement; Shenzhen Area

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