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DOI | 10.1086/692654 |
Transrotation Induced by Crustal Blocks Moving through Restraining Double Bends, with Southern California Examples | |
Ingersoll, Raymond V.; Coffey, Kevin T. | |
通讯作者 | Ingersoll, Raymond V. |
来源期刊 | JOURNAL OF GEOLOGY |
ISSN | 0022-1376 |
EISSN | 1537-5269 |
出版年 | 2017 |
卷号 | 125期号:5页码:551-559 |
英文摘要 | Within the San Andreas system of southern California, vertical-axis clockwise rotations have been attributed to (1) capture of the Monterey microplate, during which oceanic lithosphere beneath North America was transferred to the Pacific plate imparting basal traction and inducing northwestward motion of overlying North American crust, and (2) torsional force couples imposed at the ends of rotating panels. In contrast, some crustal blocks that are smaller and/or weaker than crust on opposite sides of faults have experienced clockwise transrotation as they have moved through restraining double bends: (1) rapid 40 degrees clockwise rotation of the eastern Transverse Ranges (6-0 Ma), starting with the southernmost parts and progressing northward; (2) rapid 23 degrees clockwise rotation of the Morales Formation in the Cuyama Valley (3-0 Ma); and (3) continuing clockwise rotation of the westernmost Transverse Ranges. The magnitude of rotation matches the angle between the strikes of fault segments on either side of the corresponding left bend. The oblique path of the San Andreas fault (SAf) across the disrupted Cretaceous batholith created a large-scale restraining double bend. As the rigid Sierra Nevada and Peninsular Ranges batholiths have converged along opposite sides of the SAf, the intervening SAf has rotated counterclockwise, thus tightening the restraining double bends. As a result, the magnitude of rotation of blocks moving through these bends has increased through time. Counterclockwise rotation of this segment of the SAf may also have caused 8 degrees-16 degrees counterclockwise rotation of the San Gabriel block. Our resulting palinspastic reconstructions not only satisfy kinematic and geologic constraints but also suggest a dynamic basis for transrotation of discrete crustal blocks, independent of microplate-capture events. |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000408364800005 |
WOS关键词 | WESTERN TRANSVERSE RANGES ; SAN-ANDREAS FAULT ; NEOGENE TECTONIC ROTATION ; LOS-ANGELES BASIN ; PALEOMAGNETIC VECTORS ; GARLOCK FAULT ; MOJAVE-DESERT ; SLIP ; MODEL ; DEFORMATION |
WOS类目 | Geology |
WOS研究方向 | Geology |
来源机构 | University of California, Los Angeles |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/200482 |
作者单位 | Univ Calif Los Angeles, Dept Earth Planetary & Space Sci, Los Angeles, CA 90095 USA |
推荐引用方式 GB/T 7714 | Ingersoll, Raymond V.,Coffey, Kevin T.. Transrotation Induced by Crustal Blocks Moving through Restraining Double Bends, with Southern California Examples[J]. University of California, Los Angeles,2017,125(5):551-559. |
APA | Ingersoll, Raymond V.,&Coffey, Kevin T..(2017).Transrotation Induced by Crustal Blocks Moving through Restraining Double Bends, with Southern California Examples.JOURNAL OF GEOLOGY,125(5),551-559. |
MLA | Ingersoll, Raymond V.,et al."Transrotation Induced by Crustal Blocks Moving through Restraining Double Bends, with Southern California Examples".JOURNAL OF GEOLOGY 125.5(2017):551-559. |
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