Geologic Map of the Hinkley Hills

Fletcher, John; Martín, M. del Carmen Riu de

doi:10.1130/1998-fletcher-hinkleyhills

Cited by 3 publications

(6 citation statements)

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“…The folds create a systematic outcrop pattern oriented perpendicular to the dextral faults. The granite of the Waterman Hills intrudes these folded rocks with a steep contact that is oblique to the trend of the fold hinges (Fletcher et al, 1995;Fletcher and Martin, 1998;Fletcher, 1999). An early Miocene detachment fault is exposed in the Mitchell Range and in Hinkley Hills (Fig.…”

Section: Fault Slip Estimates For Other Central Mojave Desert Faultsmentioning

confidence: 99%

“…Our analysis used detailed, digital geologic mapping data for the Hinkley Hills, Mitchel Range-Waterman Hills, and Iron Mountains (Fig. 4; Boettcher, 1990;Boettcher and Walker, 1993;Fletcher et al, 1995;Fletcher and Martin, 1998;Fletcher, 1999;Walker et al, 2002), supplemented with older mapping data from Dibblee (1960aDibblee ( , 1960b and Walker et al (1990), which were all replotted and relocated onto 1-mresolution digital orthophotographs. Restoration of dextral fault slip (horizontal component) of the aggregate features yields fault slip estimates of 4.8 ± 0.3 km for the Harper Lake fault, 2.9 ± 0.5 km for the Mount General fault, and 1.0 ± 0.7 km for the Lockhart fault.…”

Section: Fault Slip Estimates For Other Central Mojave Desert Faultsmentioning

confidence: 99%

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Path and amount of dextral fault slip in the Eastern California shear zone across the central Mojave Desert

Andrew

Walker

2017

Geological Society of America Bulletin

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New total fault slip estimates for the central Mojave Desert portion of the Eastern California shear zone support through-going dextral shear of ~18 km that is transferred northward to the Garlock fault. The Eastern California shear zone accommodates ~25% of the plate-boundary shear, with the transversely oriented Garlock fault forming its northern boundary with the Walker Lane belt. Total fault slip estimates for the major faults in the central Mojave Desert were determined using detailed geologic mapping supplemented with aeromagnetic data. Offset data for the Blackwater fault show a consistent 1.8 ± 0.1 km of dextral slip along 55 km of strike length, and they indicate that slip initiated at or after 3.8 Ma. The faults adjacent to the Blackwater fault have dextral slip of: 4.8 ± 0.3 km (Harper Lake fault); 2.9 ± 0.5 km (Mount General fault); 1.0 ± 0.7 km (Lockhart fault); and 3.2 ± 0.3 and 0.53 ± 0.05 km (Paradise fault). These slip data augment published data for the central Mojave Desert and allow evaluation of the strain path in the central Mojave Desert, showing consistent along-strike, through-going dextral slip. Contractional and extensional step-overs in the central Mojave Desert accommodate a change from focused slip in the southern central Mojave Desert to a wider and more dispersed fault system northward with a shift in the locus of dextral shear westward. We interpret these changes in the fault system to be a response to the Garlock fault, which inhibits through-going faulting but allows through-going dextral shear via clockwise deflection of its trace.

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Section: Fault Slip Estimates For Other Central Mojave Desert Faultsmentioning

confidence: 99%

Section: Fault Slip Estimates For Other Central Mojave Desert Faultsmentioning

confidence: 99%

Path and amount of dextral fault slip in the Eastern California shear zone across the central Mojave Desert

Andrew

Walker

2017

Geological Society of America Bulletin

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“…The mapping in this report revised previous reconnaissance and intermediate-scale mapping by Cox and others (2003) and Amoroso and Miller (2012). Older bedrock was studied in reconnaissance only, and the map reflects modest updates to prior mapping (Bowen, 1954;Dibblee, 1960aDibblee, ,b, 1968Boettcher, 1990;Fletcher and Martin, 1998), as well as generalization to simplify its presentation.…”

Section: Methodsmentioning

confidence: 99%

“…Mountains adjacent to Hinkley Valley expose four main rock sequences: (1) Precambrian and Paleozoic strata that are metamorphosed to a high grade, (2) mafic to felsic, generally foliated, Mesozoic granitoid, (3) early Miocene granite to granodiorite (Waterman Hills granite of Walker and others, 1995), and (4) rhyolite and dacite masses that are both intrusive and extrusive (Boettcher, 1990;Fletcher and Martin, 1998). With few exceptions, wells we studied that penetrate bedrock in Hinkley Valley retrieved two rock types: (1) variably deformed biotite granite similar to the Waterman Hills granite exposed in Lynx Cat Mountain and (2) gneissic biotite-hornblende quartz monzodiorite (~58 percent SiO 2 ) similar to minor exposures…”

Section: Bedrockmentioning

confidence: 99%

“…Rhyolite and dacite, present as dikes, sills, and extrusive bodies hundreds of meters wide, exist in both the footwall and hanging wall of the Waterman Hills detachment fault (Fletcher and Martin, 1998). The rocks are generally altered, but relatively fresh rock exposed in a few locations is gray with ~10 percent feldspar + biotite ± quartz crystals.…”

Section: Bedrockmentioning

confidence: 99%

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Geologic map and borehole stratigraphy of Hinkley Valley and vicinity, San Bernardino County, California

Miller¹,

Langenheim²,

Haddon³

2020

Scientific Investigations Map

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Chromium in minerals and selected aquifer materials

Groover¹,

Izbicki²,

Benzel³

et al. 2023

Professional Paper

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This study was developed by the U.S. Geological Survey (USGS) with input from a technical working group (TWG) composed of community members, the Lahontan Regional Water Quality Control Board (RWQCB), the Independent Review Panel Manager (Project Navigator, Ltd.), Pacific Gas and Electric Company (PG&E), and consultants for PG&E. The study was funded cooperatively under an agreement between the Lahontan RWQCB and the USGS. Funding for the study was provided by PG&E to the Lahontan RWQCB. Logistical support for field work, including access to wells, was provided by PG&E. The TWG met approximately quarterly during the study to provide input to the study, and the Hinkley community was updated annually on study progress.The authors thank the many people involved in the design and implementation of this study including the staff of the Lahontan RWQCB, the staff of PG&E and their consultants, and the staff of Project Navigator, Ltd. The authors also acknowledge and thank the many involved community members who allowed access to their properties for sample collection, and who collectively donated thousands of hours on behalf of the local community in support of this project and for resolution of other issues related to anthropogenic hexavalent chromium, Cr(VI), within the Hinkley area.

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Geologic Map of the Hinkley Hills

Cited by 3 publications

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Path and amount of dextral fault slip in the Eastern California shear zone across the central Mojave Desert

Path and amount of dextral fault slip in the Eastern California shear zone across the central Mojave Desert

Geologic map and borehole stratigraphy of Hinkley Valley and vicinity, San Bernardino County, California

Chromium in minerals and selected aquifer materials

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