Arid
DOI10.1130/0016-7606(2001)113<0855:QFHATD>2.0.CO;2
Quaternary faulting history along the Deep Springs fault, California
Lee, J; Rubin, CM; Calvert, A
通讯作者Lee, J
来源期刊GEOLOGICAL SOCIETY OF AMERICA BULLETIN
ISSN0016-7606
EISSN1943-2674
出版年2001
卷号113期号:7页码:855-869
英文摘要

New geologic mapping, structural studies, geochronology, and diffusion erosion modeling along the Deep Springs fault, California, shed light on its Quaternary faulting history. The Deep Springs fault, a 26-km-long, predominantly north-northeast-striking, west-northwest-dipping normal fault bounding the eastern side of Deep Springs Valley, cuts Jurassic batholithic rocks nonconformably overlain by middle Miocene to Pleistocene stream gravels, coarse-grained sand, tuffaceous sand, unwelded to partially welded tuff, and Bishop ash, as well as Quaternary coarse- to fine-grained alluvial fan deposits. The Ar-40/Ar-39 geochronology yields ages of 3.09 +/- 0.08 Ma for the unwelded tuff and 753 +/- 4 ka for the Bishop ash, Holocene debris Rows, a landslide, and recent alluvium bury the youngest fault scarp, The Deep Springs fault is characterized by multiple fault planes and fault scarps that become progressively younger toward the basin. The dip of the fault plane varies from 20 degrees to 87 degrees and fault-plane and striation measurements indicate an average orientation of N23E, 47NW, and N77E, 49SW, respectively. The offset of Bishop ash and underlying tuff across the Deep Springs fault indicates horizontal extension and vertical slip rates of similar to0.7 and similar to0.9 mm/yr, respectively, since the eruption of the Bishop Tuff, and similar to0.2 and similar to0.2 mm/yr, respectively, since the eruption of the unwelded tuff. If the vertical slip rate since the eruption of the Bishop Tuff has remained constant through time, then slip along the Deep Springs fault be-gan ca. 1.7 Ma, Younger fault scarps to the west of the bedrock fault cut Quaternary deposits; scarp offset ranges from 0.8 to 17.5 m, and scarp slope angle ranges from 8 degrees to 37 degrees, Topographic profiling of the smallest, least eroded fault scarps, with an average surface offset of 2.7 m, indicates that these scarps developed as the result of a single earthquake and ruptured an similar to 20-km-long segment of the fault. Radiocarbon analyses on detrital charcoal, located in the footwall block of one of these scarps, yield an age of 1.960 +/- 0.055 ka, Diffusion erosion modeling of these fault scarps yields an elapsed time of 1.7 +/- 0.5 k.y. since these fault scarps formed. Making reasonable assumptions about the depth of this earthquake and shear modulus, we estimate a moment magnitude, M-w approximate to 7.0, for this earthquake. The Deep Springs fault is one of several displacement-transfer normal faults that define a zone of distributed deformation between subparallel right-lateral strike-slip faults east of the Sierra Nevada that make up the northern part of the Eastern California Shear Zone. The young age and recent earthquake activity along the Deep Springs fault are consistent with a model proposed for the kinematic evolution of this part of the Eastern California Shear Zone.


英文关键词active faults active tectonics argon-argon fault scarps mapping normal faults structure tectonics
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000169670400005
WOS关键词EASTERN CALIFORNIA ; MOJAVE-DESERT ; SHEAR ZONE ; PANAMINT VALLEY ; EUREKA VALLEY ; DEATH-VALLEY ; OWENS-VALLEY ; SLIP RATES ; C-14 DATA ; DEFORMATION
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/140776
作者单位(1)Cent Washington Univ, Dept Geol Sci, Ellensburg, WA 98926 USA;(2)Univ Calif Santa Barbara, Inst Crustal Studies, Santa Barbara, CA 93106 USA;(3)Univ Calif Santa Barbara, Dept Geol Sci, Santa Barbara, CA 93106 USA
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Lee, J,Rubin, CM,Calvert, A. Quaternary faulting history along the Deep Springs fault, California[J],2001,113(7):855-869.
APA Lee, J,Rubin, CM,&Calvert, A.(2001).Quaternary faulting history along the Deep Springs fault, California.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,113(7),855-869.
MLA Lee, J,et al."Quaternary faulting history along the Deep Springs fault, California".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 113.7(2001):855-869.
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