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DOI | 10.1016/j.epsl.2006.07.034 |
Fault block kinematics at a releasing stepover of the Eastern California shear zone: Partitioning of rotation style in and around the Coso geothermal area and nascent metamorphic core complex | |
Pluhar, Christopher J.; Coe, Robert S.; Lewis, Jonathan C.; Monastero, Francis C.; Glen, Jonathan M. G. | |
通讯作者 | Pluhar, Christopher J. |
来源期刊 | EARTH AND PLANETARY SCIENCE LETTERS |
ISSN | 0012-821X |
EISSN | 1385-013X |
出版年 | 2006 |
卷号 | 250期号:1-2页码:134-163 |
英文摘要 | Pliocene lavas and sediments of Wild Horse Mesa in the Coso Range, CA exhibit clockwise vertical-axis rotation of fault-bounded blocks. This indicates localization of one strand of the Eastern California shear zone/Walker Lane Belt within a large-scale, transtensional, dextral, releasing stepover. We measured rotations paleomagnetically relative to two different reference frames. At two localities we averaged secular variation through sedimentary sections to reveal rotation or its absence relative to paleogeographic north. Where sediments are lacking we used areally-extensive lava flows from individual cooling units or short eruptive episodes to measure the relative rotation of localities by comparing their paleomagnetic remanence directions to one another. At the western edge of Wild Horse Mesa the fanglomerate member of the Coso Formation (c.a. 3 Ma) exhibits between 8.4 degrees +/- 7.8 degrees and 26.2 degrees +/- 9.0 degrees (two endmember models of a continuum) absolute clockwise rotation. Within Wild Horse Mesa, 33.5 Ma lavas at 5 different localities exhibit about 12.0 degrees +/- 4.6 degrees (weighted mean) clockwise rotation relative to the margins of the area, a result statistically indistinguishable from the absolute rotation. Hence the segment of the Eastern California shear zone passing through Wild Horse Mesa has caused vertical axis rotation of fault-bounded blocks as part of the overall dextral shear strain. The magnitude of block rotation at Wild Horse Mesa suggests that rotation has accommodated: 1) 1.5 km of dextral shear the area’s bounding faults and 2) 2 km of extension perpendicular to the Coso Wash normal fault during this same period. This corresponds to 13-25% extension across the mesa. In contrast to Wild Horse Mesa, the opposite (western) side of the trace of the Coso Wash normal fault hosts the Coso geothermal area and what Monastero et al. [F.C. Monastero, A.M. Katzenstein, J.S. Miller, JR. Unruh, M.C. Adams, K. Richards-Dinger, The Coso geothermal field: a nascent metamorphic core complex, Geol. Soc. Amer. Bull. 117 (2005) 1534-1553.] characterize as a nascent metamorphic core complex. Consistent with upper plate disruption above a detachment, surface rocks (i.e. the upper plate of the detachment system) at the Coso geothermal area are tilted westward. However they appear to exhibit no detectable rotation. Thus, |
英文关键词 | Eastern California shear zone Walker Lane Belt Coso volcanic field Wild Horse Mesa China Lake paleomagnetism vertical-axis rotation metamorphic core complex kinematics Pliocene |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000242050900011 |
WOS关键词 | PALEOMAGNETIC DATA ; MOJAVE-DESERT ; RANGE ; BASIN ; TRANSTENSION ; DEFORMATION ; VALLEY ; MOTION ; MODEL |
WOS类目 | Geochemistry & Geophysics |
WOS研究方向 | Geochemistry & Geophysics |
来源机构 | United States Geological Survey |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/151196 |
作者单位 | (1)Univ Calif Santa Cruz, Dept Earth Sci, Santa Cruz, CA 95064 USA;(2)Indiana Univ Penn, Indiana, PA 15705 USA;(3)Naval Air Warfare Ctr, Geothermal Program Off, China Lake, CA 93555 USA;(4)Berkeley Geochronol Ctr, Berkeley, CA 94709 USA;(5)US Geol Survey, Menlo Pk, CA 94025 USA |
推荐引用方式 GB/T 7714 | Pluhar, Christopher J.,Coe, Robert S.,Lewis, Jonathan C.,et al. Fault block kinematics at a releasing stepover of the Eastern California shear zone: Partitioning of rotation style in and around the Coso geothermal area and nascent metamorphic core complex[J]. United States Geological Survey,2006,250(1-2):134-163. |
APA | Pluhar, Christopher J.,Coe, Robert S.,Lewis, Jonathan C.,Monastero, Francis C.,&Glen, Jonathan M. G..(2006).Fault block kinematics at a releasing stepover of the Eastern California shear zone: Partitioning of rotation style in and around the Coso geothermal area and nascent metamorphic core complex.EARTH AND PLANETARY SCIENCE LETTERS,250(1-2),134-163. |
MLA | Pluhar, Christopher J.,et al."Fault block kinematics at a releasing stepover of the Eastern California shear zone: Partitioning of rotation style in and around the Coso geothermal area and nascent metamorphic core complex".EARTH AND PLANETARY SCIENCE LETTERS 250.1-2(2006):134-163. |
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