Arid
DOI10.1130/GES00740.1
Late Cretaceous gravitational collapse of the southern Sierra Nevada batholith, California
Chapman, Alan D.1,2; Saleeby, Jason B.1; Wood, David J.1; Piasecki, Alison1; Kidder, Steven1; Ducea, Mihai N.2; Farley, Kenneth A.1
通讯作者Chapman, Alan D.
来源期刊GEOSPHERE
ISSN1553-040X
出版年2012
卷号8期号:2页码:314-341
英文摘要

The Sierra Nevada batholith is an similar to 600-km-long, NNW-trending composite arc assemblage consisting of a myriad of plutons exhibiting a distinct transverse zonation in structural, petrologic, geochronologic, and isotopic patterns. This zonation is most clearly expressed by a west-to-east variation from mafic to felsic plutonic assemblages. South of 35.5 degrees N, the depth of exposure increases markedly, and fragments of shallow-level eastern Sierra Nevada batholith affinity rocks overlie deeper-level western zone rocks and subjacent subduction accretion assemblages along a major Late Cretaceous detachment system. The magnitude of displacement along this detachment system is assessed here by palinspastic reconstruction of vertical piercing points provided by batholithic and metamorphic pendant structure and stratigraphy. Integration of new and published U-Pb zircon geochronologic, thermobarometric, (U-Th)/He thermochronometric, and geochemical data from plutonic and metamorphic framework assemblages in the southern Sierra Nevada batholith reveal seven potential correlations between dispersed crustal fragments and the Sierra Nevada batholith autochthon. Each correlation suggests at least 50 km of south-to southwest-directed transport and tectonic excision of similar to 5-10 km of crust along the Late Cretaceous detachment system. The timing and pattern of regional dispersion of crustal fragments in the southern Sierra Nevada batholith is most consistent with Late Cretaceous collapse above the underplated accretionary complex. We infer, from data presented herein (1) a high degree of coupling between the shallow and deep crust during extension, and (2) that the development of modern landscape in southern California was greatly preconditioned by Late Cretaceous tectonics.


类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000302767800005
WOS关键词SAN-ANDREAS FAULT ; IN-HORNBLENDE BAROMETER ; INDEPENDENCE DIKE SWARM ; DETRITAL-ZIRCON GEOCHRONOLOGY ; SOUTHWESTERN NORTH-AMERICA ; METAMORPHIC CORE COMPLEXES ; MIOCENE DETACHMENT FAULTS ; WESTERN MOJAVE DESERT ; SNOW LAKE PENDANT ; TEHACHAPI MOUNTAINS
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
来源机构University of Arizona
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/172619
作者单位1.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA;
2.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA
推荐引用方式
GB/T 7714
Chapman, Alan D.,Saleeby, Jason B.,Wood, David J.,et al. Late Cretaceous gravitational collapse of the southern Sierra Nevada batholith, California[J]. University of Arizona,2012,8(2):314-341.
APA Chapman, Alan D..,Saleeby, Jason B..,Wood, David J..,Piasecki, Alison.,Kidder, Steven.,...&Farley, Kenneth A..(2012).Late Cretaceous gravitational collapse of the southern Sierra Nevada batholith, California.GEOSPHERE,8(2),314-341.
MLA Chapman, Alan D.,et al."Late Cretaceous gravitational collapse of the southern Sierra Nevada batholith, California".GEOSPHERE 8.2(2012):314-341.
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