Residual stress preserved in quartz from the San Andreas Fault Observatory at Depth

被引：41

作者：

Chen, Kai ^{[1
]}

Kunz, Martin ^{[2
]}

Tamura, Nobumichi ^{[2
]}

Wenk, Hans-Rudolf ^{[3
]}

机构：

[1] Xi An Jiao Tong Univ, Ctr Adv Mat Performance Nanoscale CAMP Nano, State Key Lab Mech Behav Mat, Xian 710049, Shaanxi, Peoples R China

[2] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[3] Univ Calif Berkeley, Earth & Planetary Sci, Berkeley, CA 94720 USA

来源：

GEOLOGY | 2015年 / 43卷 / 03期

基金：

美国国家科学基金会;

关键词：

TOHOKU-OKI EARTHQUAKE; SAFOD CORE; SLIP ZONE; ROCKS; DISCLINATIONS;

D O I：

10.1130/G36443.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

We report on measurements of residual stress up to 300 MPa with a microfocused synchrotron X-ray beam in quartz fragments in a cataclasite from the damage zone of the San Andreas fault, California (USA). Samples were extracted from the San Andreas Fault Observatory at Depth drill core at a depth of 2.7 km. Stresses were derived from lattice distortions observed on Laue diffraction images. These stresses are distributed nonhomogeneously at the micron scale and are much higher than bulk-rock strengths of fault gouge, suggesting different processes at the microscopic and macroscopic scales. Our results indicate that residual lattice strain in quartz is a potential paleopiezometer to estimate stress in deformed rocks.

引用

收藏

页码：219 / 222

页数：4

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