通过碎屑低温年龄恢复西南天山古高度

doi:10.13278/j.cnki.jjuese.201703112

吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (3): 785-792.doi: 10.13278/j.cnki.jjuese.201703112

通过碎屑低温年龄恢复西南天山古高度

丁汝鑫^1,2, 梁世友³, 何将启⁴

1. 中山大学地球科学与工程学院, 广州 510275;
2. 广东省地质过程与矿产资源探查重点实验室, 广州 510275;
3. 中国石化石油勘探开发研究院无锡石油地质研究所, 江苏无锡 214126;
4. 中海石油(中国)有限公司勘探部, 北京 100010

收稿日期:2016-12-07 出版日期:2017-05-26 发布日期:2017-05-26
作者简介:丁汝鑫(1978-),男,讲师,主要从事构造地质学方面的研究,E-mail:dingrux@mail.sysu.edu.cn
基金资助:
国家自然科学基金项目（41102131）；广东省自然科学基金项目（2015A030313193）

Paleoelevation Reconstruction of Southwestern Tianshan Using Detrital Low-Temperature Thermochronology

Ding Ruxin^1,2, Liang Shiyou³, He Jiangqi⁴

1. School of Earth Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China;
2. Guangdong Provincial Key Laboratory of Mineral Resources & Geological Processes, Guangzhou 510275, China;
3. Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi 214126, Jiangsu,China;
4. Exploration Department, CNOOC Limited, Beijing 100010, China

Received:2016-12-07 Online:2017-05-26 Published:2017-05-26
Supported by:
Supported by the National Natural Science of China (41102131) and Natural Science Foundation of Guangdong Province (2015A030313193)

摘要/Abstract

摘要： 目前使用低温年代学来恢复造山带古地形，主要是采用在造山带内部采样来做原地高度的恢复。本文提出用碎屑颗粒低温年代学来恢复造山带平均古高度变化率的方法，即通过山间盆地或山前堆积碎屑物大量的单颗粒年龄，获取蚀源区大面积的、区域性的平均剥露速率，进而通过均衡校正计算出蚀源区的平均古高度变化率，为造山带古地形恢复提供了新的途径。本文以西南天山为例进行尝试，通过已发表的339个碎屑颗粒裂变径迹年龄，获得西南天山的6~8 Ma（年龄峰期）的剥露速率为0.74~0.60 km/Ma，平均古高度变化率为0.15~0.23 km/Ma、0.12~0.19 km/Ma（降低率）。显示西南天山在6~8 Ma以来发生了比较快速的剥露，如果不考虑构造抬升等因素，平均古高度也发生了比较快速的降低，如果按8 Ma以来计算，则正好降低了1 000~1 500 m。

关键词: 碎屑颗粒, 裂变径迹, 剥露速率, 西南天山

Abstract: At present, paleoelevation reconstructiion of the orogenic belt is mainly based on low-temperature thermochronology of samples collected within the orogenic belt. In this paper, a method is proposed to recover the average height change rate of the orogenic belt by using the low-temperature chronology of the detrital grains, which provides a new way for the restoration of orogenic paleo-terrain. It means that the large-scale and regional average exhumation rate can be calculated through the detrital single grain ages located in intramontane basin or piedmont, and then the average ancient height change rate of the erosion area can be calculated by the isostatic correction. In this paper, the calculation results are, by using the published 339 detrital grain ages of fission track, that the exhumation rate of 6-8 Ma (age peak) of southwestern Tianshan was 0.74-0.60 km/Ma, and the average ancient height change rate was 0.15 to 0.23 km/Ma and 0.12 to 0.19 km/Ma (decreasing rate). This conclusion indicates that the southwestern Tianshan has experienced a rapid exhumation since 6-8 Ma ago, in the case of without considering the structural uplift and other factors, and the average paleo-height has decreased rapidly 1 000-1 500 m since 8 Ma ago.

Key words: detrital grains, fission track, exhumation rate, southwestern Tianshan

中图分类号:

丁汝鑫, 梁世友, 何将启. 通过碎屑低温年龄恢复西南天山古高度[J]. 吉林大学学报(地球科学版), 2017, 47(3): 785-792.

Ding Ruxin, Liang Shiyou, He Jiangqi. Paleoelevation Reconstruction of Southwestern Tianshan Using Detrital Low-Temperature Thermochronology[J]. Journal of Jilin University(Earth Science Edition), 2017, 47(3): 785-792.

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通过碎屑低温年龄恢复西南天山古高度

Paleoelevation Reconstruction of Southwestern Tianshan Using Detrital Low-Temperature Thermochronology

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