Arid
DOI10.1086/692654
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
ISSN0022-1376
EISSN1537-5269
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
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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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