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Chocolate Fault

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Figure 2. Models for origin of Vincent and Orocopia-<b>Chocolate</b> <b>faults</b>. A: De...
in > Geology
Published: 01 February 2002
Figure 2. Models for origin of Vincent and Orocopia-Chocolate faults. A: Detachment-fault model. B: Passive-roof thrust model. P-Osch—Pelona-Orocopia Schist, VF—Vincent fault, OCF—Orocopia-Chocolate fault
Journal Article
Journal: Geology
Published: 01 February 2002
Geology (2002) 30 (2): 183-186.
...Figure 2. Models for origin of Vincent and Orocopia-Chocolate faults. A: Detachment-fault model. B: Passive-roof thrust model. P-Osch—Pelona-Orocopia Schist, VF—Vincent fault, OCF—Orocopia-Chocolate fault ...
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Journal Article
Published: 01 December 2011
Journal of Sedimentary Research (2011) 81 (12): 859-873.
... sequence III. In addition, key components of a conjugate set of northwest- and northeast-trending dextral- and sinistral-slip faults, respectively, transect the Copper basin fault, the axis of the Chocolate Mountains anticlinorium, and the ∼ 9.45 Ma basalts of Black Mountain. However, neither the Copper...
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Journal Article
Journal: GSA Bulletin
Published: 01 February 1978
GSA Bulletin (1978) 89 (2): 251-264.
...BRUCE M. CROWE Abstract A complex sequence of Oligocene-age volcanic and volcaniclastic rocks form a major volcanic center in the Picacho area of the southeasternmost Chocolate Mountains, Imperial County, California. Basal-volcanic rocks consist of lava flows and flow breccia of trachybasalt...
Series: Society of Exploration Geophysicists Geophysical References Series
Published: 01 January 1998
EISBN: 9781560801832
... possible. Abstract Gravity and magnetic data are used to determine the possible location of detachment fault-related upper-plate tilt blocks that may contain ore bodies in Jurassic gneisses similar to or associated with the Mesquite gold mine of southeastern California. Residual gravity and magnetic...
Series: GSA Memoirs
Published: 01 January 1993
DOI: 10.1130/MEM178-p1
... and Techachapi Mountains, and in the Portal Ridge area of the northwestern-most Mojave Desert; and (4) in the southern part of the Transverse Ranges west of the San Andreas fault, in the northern Peninsular Ranges, and in the southern Chocolate Mountains. Simultaneous reconstruction of the four paleogeologic...
Series: GSA Memoirs
Published: 01 January 1993
DOI: 10.1130/MEM178-p199
... The pre-Quaternary geology of the southern Chocolate and Cargo Muchacho mountains correlates with that exposed in San Gorgonio Pass between the Mission Creek and Banning branches of the San Andreas fault. Matching features include: (1) the southernmost exposures of the Triassic Mount Lowe...
Series: GSA Memoirs
Published: 01 January 1993
DOI: 10.1130/MEM178-p107
..., the Punchbowl and Mill Creek basins, the Coachella Fanglomerate and Hathaway Formation, and the fanglomerate of Bear Canyon in the southern Chocolate Mountains. The new reconstruction allows only about 205 km of displacement on the combined San Andreas and San Gabriel fault zones, which is about 110 km short...
Image
A)  Geologic map of study area. CMF  =  <b>Chocolate</b> Mountains <b>fault</b>, GF  =  G...
Published: 01 December 2011
F ig. 3.— A) Geologic map of study area. CMF  =  Chocolate Mountains fault, GF  =  Gatuna fault, SF  =  Sortan fault, CBF  =  Copper Basin fault B) legend. C) Schematic diagram of the seven mapped formations making up the ∼ 23 Ma volcanic and epiclastic unit.
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2007.2419(01)
... of schist exposed along the Chocolate Mountains anticlinorium of southeastern California and southwestern Arizona, these data provide strong evidence for a major middle Cenozoic extensional event throughout the region. The inferred middle Cenozoic extensional faults are folded by the Chocolate Mountains...
Journal Article
Published: 01 October 1986
Bulletin of the Seismological Society of America (1986) 76 (5): 1289-1303.
.... Because West Mesa and the Chocolate Mountains are underlain by different types of basement than is the Imperial Valley, these major zones of high gradient apparently mark the locations of major crustal boundaries. Most active faults have basement scarps along at least parts of their lengths. Basement...
Journal Article
Journal: Economic Geology
Published: 01 December 1992
Economic Geology (1992) 87 (8): 2002-2022.
... Tertiary sedimentary rocks and minor basalt and Quaternary alluvium on the south piedmont slope of the Chocolate Mountains. This range forms part of the eastern margin of the Salton trough and is within an area cut by numerous, but now-inactive, strands of the Neogene San Andreas fault system. Extensive...
Image
<b>Chocolate</b>-tablet  boudinage-type  brecciation (Wegman, 1932), found within ...
Published: 01 March 2000
Figure 4 Chocolate-tablet boudinage-type brecciation (Wegman, 1932), found within the chert beds of the Malmani Subroup, in the ramps intersected by the thrust faults associated with the Vredefort Event. Note that the brecciation caused the chert to ‘explode’ in three dimensions. Although
Journal Article
Journal: Geology
Published: 01 July 2016
Geology (2016) 44 (7): 575-578.
... and may represent a future localization of the plate boundary that is migrating west from the San Andreas fault. Beneath the Salton Trough and the Chocolate Mountains region, large splitting times, despite a very thin lithosphere, imply vertical melt pockets in the uppermost mantle aligned in the shear...
Journal Article
Published: 01 March 2000
South African Journal of Geology (2000) 103 (1): 15-31.
...Figure 4 Chocolate-tablet boudinage-type brecciation (Wegman, 1932), found within the chert beds of the Malmani Subroup, in the ramps intersected by the thrust faults associated with the Vredefort Event. Note that the brecciation caused the chert to ‘explode’ in three dimensions. Although...
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Series: Guidebook
Publisher: The Pacific Section American Association of Petroleum Geologists
Published: 01 January 1996
DOI: 10.32375/1996-GB73.14
EISBN: 9781732014848
... is a continuation of the highly extended terrane along the Colorado River and that to the west in the California Continental Borderlands. This crustal extension in the Orocopia-Chocolate Mountains region helped localize the San Andreas fault system and is itself offset along the San Andreas to numerous exposures...
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Series: Society of Economic Geologists Guidebook Series
Published: 01 January 1991
DOI: 10.5382/GB.12
EISBN: 9781934969656
... of active faulting along the modem San Andreas fault system (Crowell, 1979) and the locale for this field trip (Fig. 1). Inactive strands of the Neogene San Andreas fault system cut the Chocolate Mountains (Dillon, 1976; Crowell, 1979). Production from the Mesquite Mining district began in 1985 and is now...
Series: Guidebook
Publisher: The Pacific Section American Association of Petroleum Geologists
Published: 01 January 1996
DOI: 10.32375/1996-GB73.13
EISBN: 9781732014848
... of domino and listric faults that offset the region west of eastern New Mexico, east of the Rio Grande Rift. This stacked array of extensional faults collectively extended the crust, offsetting Mesozoic fabrics such as the Santa Rosa Mylonite zone and the Chocolate Mountains thrust. Faults developed during...
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Journal Article