地学前缘 ›› 2015, Vol. 22 ›› Issue (2): 79-85.DOI: 10.13745/j.esf.2015.02.007

• 钦-杭成矿带地质背景 • 上一篇    下一篇

钦杭结合带南段韧性剪切带印支期活动记录:以防城—灵山断裂带为例

丁汝鑫, 邹和平, 劳妙姬, 杜晓东, 周永章, 曾长育   

  1. 1. 中山大学 地球科学与地质工程学院, 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
  • 收稿日期:2014-07-26 修回日期:2014-09-20 出版日期:2015-03-15 发布日期:2015-03-15
  • 作者简介:丁汝鑫(1978—),男,博士,讲师,主要从事构造地质学研究。E-mail:dingrux@mail.sysu.edu.cn
  • 基金资助:

    国家自然科学基金项目(41102131,41372223);中央高校基本科研业务费专项资金资助项目(12lgpy22);中国地质调查局项目(1212011121064,资[2010]矿评011533);中山大学青年教师起步资助计划项目(32110-3181401)

Indosinian activity records of ductile shear zones in southern segment of QinHang combined belt: A case study of FangchengLingshan fault zone.

  • Received:2014-07-26 Revised:2014-09-20 Online:2015-03-15 Published:2015-03-15

摘要:

钦杭结合带南段发育一系列北东走向的韧性剪切带,防城—灵山断裂带是其中非常重要的一条。综合不同尺度地质构造特征和千糜岩绢云母单矿物40Ar/39Ar测年结果,表明钦杭结合带南段防城—灵山韧性剪切带印支期可能存在两期活动,一期为早三叠世,另一期为晚三叠世,早期活动导致近EW向变形,晚期形成NE向右旋韧性剪切带。根据千糜岩绢云母40Ar/39Ar年龄数据分析,认为防城—灵山断裂带在印支期发生右旋剪切活动的具体年龄接近于(203.9±1.7) Ma。

关键词: 防城&mdash, 灵山断裂带;印支期;韧性剪切带

Abstract:

A series of NEtrending ductile shear zones formed in southern segment of QinHang combined belt, and FangchengLingshan fault zone is a very important one among them. Comprehensive geological features of different scales and the 40Ar/39Ar dating results of sericite in fault zone indicate that there may have been two periods of fault activity in FangchengLingshan fault zone during the Indosinian Movement. One is the Early Triassic when the early activity led to nearly EWtrending deformation; the other is the Late Triassic when the late activity led to the formation of NEtrending dextral ductile shear zone. According to the 40Ar/39Ar dating results, the accurate age of late activity is close to 203.9±1.7 Ma.

Key words:  FangchengLingshan fault zone, Indosinian period, ductile shear zone

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