Late Quaternary right-lateral slip rates of faults adjacent to the lake Qinghai, northeastern margin of the Tibetan Plateau

被引：156

作者：

Yuan, Dao-Yang ^{[1
]}

Champagnac, Jean-Daniel ^{[2
,3
,4
]}

Ge, Wei-Peng ^{[1
]}

Molnar, Peter ^{[3
,4
]}

Zhang, Pei-Zhen ^{[5
]}

Zheng, Wen-Jun ^{[5
]}

Zhang, Hui-Ping ^{[5
]}

Liu, Xing-Wang ^{[1
]}

机构：

[1] China Earthquake Adm, Lanzhou Inst Seismol, Lanzhou 730000, Peoples R China

[2] Swiss Fed Inst Technol EHTZ, CH-8092 Zurich, Switzerland

[3] Univ Colorado, Dept Geol Sci, Boulder, CO 80309 USA

[4] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80309 USA

[5] China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China

来源：

GEOLOGICAL SOCIETY OF AMERICA BULLETIN | 2011年 / 123卷 / 9-10期

基金：

瑞士国家科学基金会; 美国国家科学基金会;

关键词：

ALTYN-TAGH FAULT; INDIA-ASIA COLLISION; IN-SITU BE-10; RESOLUTION MAGNETO STRATIGRAPHY; LATE CENOZOIC DEFORMATION; WESTERN HAIYUAN FAULT; KUNLUN FAULT; EROSION RATES; CONTINENTAL DEFORMATION; ACTIVE DEFORMATION;

D O I：

10.1130/B30315.1

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

By combining terrace riser offsets with terrace ages dated by C-14, optically stimulated luminescence (OSL), and Be-10 techniques, we determine average slip rates of 1.1 +/- 0.3 mm/yr and 1.2 +/- 0.4 mm/yr for the Elashan and Riyueshan faults, two north-northwest-trending, right-lateral, strike-slip faults west and east of the lake Qinghai in the northeastern margin of the Tibetan Plateau. These faults are conjugate to the major easterly trending, left-lateral Altyn Tagh, Haiyuan-Qilianshan, and Kunlun faults, and they contribute to the subdivision of the region between the Haiyuan-Qilianshan and Kunlun faults into small blocks tens to similar to 100 km in dimension. The relatively low slip rates in this region reflect-distributed deformation. The total right-lateral offsets of geological contacts are similar to 9-12 km along the Elashan fault and similar to 11-12 km for the northern segment of the Riyueshan-fault. If long-term slip rates were constant during late Cenozoic time, dates of initiation of dextral movement would be 9 or 10 +/- 3 Ma for the two strike-slip faults, concurrent with onsets or acceleration of tectonic deformation in Cenozoic basins nearby. Our study highlights a stage of tectonic deformation in the northeastern margin of the Tibetan Plateau beginning since ca. 8-12 Ma, tens of millions of years after the collision between India and Eurasia began.

引用

页码：2016 / 2030

页数：15

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