期刊
JOURNAL OF STRUCTURAL GEOLOGY
卷 32, 期 8, 页码 1137-1146出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsg.2010.07.001
关键词
Geothermal fluid; Tectonic stress; Bingham distribution; Vein-type ore
资金
- JSPS [20-5835, 21740364]
- Grants-in-Aid for Scientific Research [21740364] Funding Source: KAKEN
Plio-Pleistocene epithermal quartz veins in southern Kyushu, Japan, include gold deposits. The coherent trend of the ore veins suggests tectonic control for their formation. However, the stress regime during the formation has been controversial. To solve this problem, we improved existing methods for inferring paleostresses from vein orientations. It was assumed that veins making a cluster were formed intermittently from thermal fluids with various pressures. The present method determines stress ratio and stress axes with 95% confidence regions. The method was applied to mid Pliocene quartz veins cropping out at Hashima, southwestern Kyushu. We obtained a normal-faulting regime of stress with the trend of sigma3 at 167 degrees +/- 10 degrees and the stress ratio at 0.20 + 0.13/-0.09. The low stress ratio and the lack of slickenlines and slickenfibers on vein walls suggest that the host rock was subject to a small differential stress, i.e., a weak tectonic stress, when the veins were formed. (C) 2010 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据