THE TECTONIC IMPLICATION OF TWO RAPID COOLING EVENTS ON THE SOURTHERN XIZANG(TIBET) PLATEAU

SEISMOLOGY AND GEOLOGY ›› 1996, Vol. 18 ›› Issue (2): 109-115.

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THE TECTONIC IMPLICATION OF TWO RAPID COOLING EVENTS ON THE SOURTHERN XIZANG(TIBET) PLATEAU

Chen Wenji¹, Li Qi¹, Zhou Xinhua², Yin An³, T. M. Harrison³

1. Institute of Geology, SSB, Beijing 100029;
2. Institute of Geology, Chinese Academy of Sciences, Beijing 100029;
3. Department of Earth & Space Sciences, University of California, Los Angeles, CA90024 USA

Received:1995-12-31 Revised:1996-01-31 Online:1996-06-05 Published:2009-11-25

西藏高原南部两次快速冷却事件的构造含义

陈文寄¹, 李齐¹, 周新华², 尹安³, T. M. 哈里森³

1. 国家地震局地质研究所, 北京 100029;
2. 中国科学院地质研究所, 北京 100029;
3. 美国加州大学洛杉矶分校地球和空间科学系, CA90024

基金资助:
国家自然科学基金(491731361)

Abstract

Abstract: ⁴⁰Ar-³⁹Ar analyses and MDD(multiple diffusion domain) model cooling history were performed for 8 K-feldspar samples. They were colleted from Gangdese thrust (GT) in Zedang area and two valleyes of east Nian Qing Tang Gula mountain(NT). Two rapid cooling events at GT and NT were obtained after excess argon(⁴⁰Ar_E) was released from K-feldspar at low temperatures(<800℃) during ⁴⁰Ar-³⁹Ar step-heating experiments corrected by ⁴⁰Ar-Cl ratios. The first rapid cooling event suggested that active time of GT occurred between 27～24Ma. The lower age limit and slip rate were～18 Ma and (12±6)mm/a respetively. The second rapid cooling event at NT suggested that the crustal thickness and elevation may be close to their present level at ～8Ma on the southern Tibetan ploteau.

Key words: Xizang, Termal history, Fault chorn, MDD

摘要： 研究了西藏泽当地区冈底斯逆冲断层(GT)和念青唐古拉山峰东侧两条山谷(NT)中8个钾长石样品的MDD冷却历史,对钾长石低温阶段异常高年龄进行了C1校正,得到了两次明显的快速冷却事件。前者(GT)提供了网底斯逆冲断层的活动时间27～24Ma、下限年龄约18Ma和最小滑动速率(12±6)mm/a.后者(NT)表明在约8Ma,即正断层运动开始时,西藏高原东南部地壳增厚和抬升可能已达到了近于现今的高度和水平。

关键词: 西藏, 热历史, 断层年代, MDD模式

Chen Wenji, Li Qi, Zhou Xinhua, Yin An, T. M. Harrison. THE TECTONIC IMPLICATION OF TWO RAPID COOLING EVENTS ON THE SOURTHERN XIZANG(TIBET) PLATEAU[J]. SEISMOLOGY AND GEOLOGY, 1996, 18(2): 109-115.

陈文寄, 李齐, 周新华, 尹安, T. M. 哈里森. 西藏高原南部两次快速冷却事件的构造含义[J]. 地震地质, 1996, 18(2): 109-115.

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THE TECTONIC IMPLICATION OF TWO RAPID COOLING EVENTS ON THE SOURTHERN XIZANG(TIBET) PLATEAU

西藏高原南部两次快速冷却事件的构造含义

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