Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1130/B31870.1 |
Is the Vincent fault in southern California the Laramide subduction zone megathrust? | |
Xia, Haoran1,2; Platt, John P.1 | |
2019 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2019 |
卷号 | 131页码:120-136 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The Vincent fault in the San Gabriel Mountains, southern California, which forms the contact between the Proterozoic gneisses and Mesozoic magmatic arc in the upper plate and the subduction-associated Pelona Schist in the lower plate, has long been regarded as the Laramide subduction zone megathrust. Our investigation of the structural and thermal evolution of the Vincent fault and the associated mylonite zone requires a reevaluation of its tectonic significance. The base of the upper plate and the uppermost section of the lower plate are involved in a mylonite zone up to 1 km thick. Two mylonitic subzones are recognized within the upper-plate mylonites. The lower mylonite zone records pressuretemperature conditions of 0.46-0.52 GPa and 362-409 degrees C. Estimated shear stresses for the lower mylonite zone based on the recrystallized quartz grain size lie between 17.0 and 29.5 MPa. The upper mylonite zone records pressure-temperature conditions of 0.19-0.22 GPa and 323-341 degrees C, and shear stresses between 46.9 and 71.4 MPa. The microstructures show that part of the lower mylonite zone was overprinted by the upper mylonite zone and that the mylonites were formed during retrogressive metamorphism and exhumation. Sense of shear indicators preserved in the mylonitized Pelona Schist and the mylonitic gneisses consistently show that the upper plate moved southeastward relative to the lower plate. Zircon fission-track analysis suggests that the upper plate of the Vincent fault is not cut by any major faults, except for late Miocene to recent strike-slip faults of the San Andreas system. These observations do not support the idea that the Vincent fault is the Laramide subduction zone megathrust; instead, we conclude that it is a normal fault that contributed to the exhumation of the Pelona Schist. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000454928000008 |
WOS关键词 | SAN-GABRIEL-MOUNTAINS ; SHEAR ZONE ; DYNAMIC RECRYSTALLIZATION ; RHEOLOGICAL EVOLUTION ; CRUSTAL EXTENSION ; PELONA SCHIST ; QUARTZ ; STRESS ; TITANIQ ; TI |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24590 |
专题 | 地球科学 |
作者单位 | 1.Univ Southern Calif, Dept Earth Sci, Los Angeles, CA 90089 USA; 2.Chevron Energy Technol Co, Houston, TX 77002 USA |
推荐引用方式 GB/T 7714 | Xia, Haoran,Platt, John P.. Is the Vincent fault in southern California the Laramide subduction zone megathrust?[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2019,131:120-136. |
APA | Xia, Haoran,&Platt, John P..(2019).Is the Vincent fault in southern California the Laramide subduction zone megathrust?.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,131,120-136. |
MLA | Xia, Haoran,et al."Is the Vincent fault in southern California the Laramide subduction zone megathrust?".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 131(2019):120-136. |
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