Apatite fission track analysis for revealing tectonic events of the Bayinguole area in the west section of Eastern Kunlun Mountains, northern Qinghai-Tibet Plateau

CHEN Xiaoning; YUAN Wanming; ZHANG Aikui; HAO Nana; DUAN Hongwei; FENG Yunlei

doi:10.11889/j.0253-3219.2014.hjs.37.010503

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Apatite fission track analysis for revealing tectonic events of the Bayinguole area in the west section of Eastern Kunlun Mountains, northern Qinghai-Tibet Plateau

更新时间：2021-03-03

- Apatite fission track analysis for revealing tectonic events of the Bayinguole area in the west section of Eastern Kunlun Mountains, northern Qinghai-Tibet Plateau
- NUCLEAR TECHNIQUES Vol. 37, Issue 1, Article number: 010503(2014)
- 作者机构：
  
  1. 中国地质大学科学研究院,北京,100083
  2. 青海省第三地质矿产勘查院,西宁,810008
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.010503
  CLC：
- Published：20 January 2014
- 稿件说明：
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CHEN Xiaoning, YUAN Wanming, ZHANG Aikui, et al. Apatite fission track analysis for revealing tectonic events of the Bayinguole area in the west section of Eastern Kunlun Mountains, northern Qinghai-Tibet Plateau[J]. Nuclear techniques, 2014, 37(1): 010503
DOI：

CHEN Xiaoning, YUAN Wanming, ZHANG Aikui, et al. Apatite fission track analysis for revealing tectonic events of the Bayinguole area in the west section of Eastern Kunlun Mountains, northern Qinghai-Tibet Plateau[J]. Nuclear techniques, 2014, 37(1): 010503 DOI： 10.11889/j.0253-3219.2014.hjs.37.010503.

摘要

东昆仑西段巴音郭勒地区花岗岩类样品的磷灰石裂变径迹年龄变化于120?47 Ma，具体可分为120?100Ma、67 Ma和54?47 Ma三组。这些年龄很好地揭示了区内所经历的相关构造活动，其中年龄120?100Ma和67 Ma是冈底斯地体和喜马拉雅地体先后于早白垩世和晚白垩世时期，分别向北俯冲并与其北侧地块相互碰撞-汇聚-拼合的体现；而年龄54?47 Ma与始新世区内造山后伸展事件有关。磷灰石裂变径迹模拟结果显示，研究区具有180?140 Ma、140?13 Ma和13?0 Ma三阶段构造热演化历史，分别隆升约1.0 km、0.6km和1.4 km，其中第三阶段是快速隆升期，冷却温度为50 oC，三阶段累计隆升幅度为3.0 km。同时，根据公式计算获得3个样品的岩石隆升量分别为3620 m、3320 m和3770 m，平均值为3570 m，与三阶段算法所得结果相符。

Abstract

Background: Qimantage is an important tectonic metallogenic belt in western part of East Kunlun Mountain. It has experienced complex geological evolution

and significant mineralization. However

because of the plateau climate and inaccessibility

fewer research works have been done on this area

especially after Indo-sinian epoch. Purpose: Our work is to research tectonic activity

thermal history and uplifting around Bayinguole river in Qimantage belt. Methods: The apatite fission-track method was applied to research the tectonic setting

simulate the thermal history and calculate the uplift size and uplift speed. Results: A series of apatite fission track ages from granitoid samples in Bayinguole area of Eastern Kunlun Mountain were obtained

ranging from 120 Ma to 47 Ma that might be divided into three groups: 120?100 Ma

67 Ma and 54?47 Ma. These ages reflected tectonic events in this area very well. Conclusions: The 120?100 Ma and 67 Ma ages present collision-convergences of Gangdese terrane and Himalayan terrane with their north-side terranes in Early Cretaceous and Late Cretaceous respectively. The ages of 54?47 Ma reflect post-orogenic stretching events in Eocene. Three stages of thermal evolution history are revealed by apatite fission track modeling in this area. Stage one 180?140 Ma is in the bottom temperature of apatite fission track anneal zone. Stage two 140?13 Ma records slow cooling. The last stage after 13 Ma records rapid cooling with temperature dropped 50 oC. The uplifting ranges for these three stages are 1.0 km

0.6 km and 1.4 km

respectively. The cumulative amount of uplift is about 3.0 km. The formular calculations for the 3 samples have their rock uplifts of 3623 m

3317 m and 3769 m

respectively

averaging 3570 m

in accordance with the results based on the 3 stage thermal history.Cited

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