High-Angle Normal Faulting at the Tangra Yumco Graben (Southern Tibet) since ∼15 Ma

地质学 锆石 地堑 裂变径迹测年 白垩纪 热年代学 裂谷 断层(地质) 地球化学 黑云母 入侵 古生物学 构造学 石英
作者
Reinhard Wolff,Ralf Hetzel,István Dunkl,Qiang Xu,Michael Bröcker,Aneta A. Anczkiewicz
出处
期刊:The Journal of Geology [University of Chicago Press]
卷期号:127 (1): 15-36 被引量:39
标识
DOI:10.1086/700406
摘要

Several active graben systems in Tibet and the Himalaya are the expression of ongoing east-west extension, but the significance and history of normal faulting in this large region are still debated. Here, we present geo- and thermochronological data for a granite intrusion in the footwall of an active high-angle normal fault at the Tangra Yumco graben to constrain the onset and history of normal faulting. Crystallization of the granitic rocks occurred at 87±1 Ma, as revealed by U/Pb zircon dating. After an initial phase of rapid cooling from magmatic temperatures, a later phase of slow cooling is recorded by Rb/Sr biotite ages between ∼72 and ∼60 Ma. The elevation dependence of the Rb/Sr ages suggests that cooling was controlled by erosion, which proceeded at a rate of ∼0.05 km/My during the latest Cretaceous and early Paleocene. The subsequent history of normal faulting is recorded by zircon (U-Th)/He ages of 12.5±1.1 and 9.7±0.7 Ma, apatite fission-track ages between 10.8±1.7 and 7.8±1.2 Ma, and apatite (U-Th)/He ages from 4.9±0.4 to 3.0±0.2 Ma. Thermokinematic modeling of these age data indicates that normal faulting started at 14.5±1.8 Ma at a rate of ∼0.3 km/My and accelerated to ∼0.7 km/My in the Pliocene. Our age constraint for the initiation of faulting supports a widespread onset of rifting in Tibet at ∼15–10 Ma, as reported for other graben systems. Finally, we suggest that the distribution of high-angle and low-angle normal faults is controlled by their position relative to the India-Asia convergence vector and by lateral variations in the thermal state of the lithosphere.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
刚刚
Jason发布了新的文献求助10
2秒前
2秒前
Loong完成签到,获得积分10
3秒前
科研通AI2S应助sigla采纳,获得10
3秒前
3秒前
3秒前
卷儿完成签到,获得积分10
4秒前
4秒前
大钱完成签到,获得积分10
5秒前
5秒前
卞斌锋完成签到 ,获得积分20
5秒前
5秒前
5秒前
5秒前
5秒前
我是老大应助淡淡的新之采纳,获得10
6秒前
慕青应助CX采纳,获得10
6秒前
6秒前
6秒前
7秒前
7秒前
hanchangcun发布了新的文献求助10
8秒前
Xianhe完成签到,获得积分10
8秒前
summer发布了新的文献求助10
8秒前
可可发布了新的文献求助10
9秒前
9秒前
今后应助kiwiii采纳,获得10
9秒前
假唱卡带完成签到,获得积分10
9秒前
李青秀发布了新的文献求助20
9秒前
garey发布了新的文献求助10
10秒前
10秒前
Leeyee发布了新的文献求助10
10秒前
段红琼发布了新的文献求助30
10秒前
卷儿发布了新的文献求助10
10秒前
11秒前
Cici发布了新的文献求助10
11秒前
12秒前
12秒前
hlc完成签到,获得积分10
12秒前
高分求助中
A new approach to the extrapolation of accelerated life test data 1000
Cognitive Neuroscience: The Biology of the Mind 1000
Technical Brochure TB 814: LPIT applications in HV gas insulated switchgear 1000
Toward a Combinatorial Approach for the Prediction of IgG Half-Life and Clearance 500
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Picture Books with Same-sex Parented Families: Unintentional Censorship 500
Nucleophilic substitution in azasydnone-modified dinitroanisoles 500
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 3970120
求助须知:如何正确求助?哪些是违规求助? 3514810
关于积分的说明 11176124
捐赠科研通 3250136
什么是DOI,文献DOI怎么找? 1795198
邀请新用户注册赠送积分活动 875647
科研通“疑难数据库(出版商)”最低求助积分说明 804964