Geologic Map of the Southern Slate Range and a Portion of the Central Garlock Fault, China Lake Naval Weapons Station, San Bernardino County, California

Andrew, Joseph

doi:10.1130/2014.dmch020

Cited by 1 publication

(10 citation statements)

References 9 publications

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“…The most prominent faults in the area are WSW-striking sinistral strike-slip faults, the Garlock fault, and the newly identified Marine Gate fault (Fig. 2; Rittase, 2012;Andrew et al, 2014aAndrew et al, , 2015. The sedimentary rocks discussed in this paper are sandwiched between these major structures.…”

Section: Strike-slip Faultsmentioning

confidence: 85%

“…Sources and changes in source areas are essential to unraveling the slip history of the Garlock fault (Andrew et al, 2015). The descriptions in this paper rely on recent geologic maps of the southern Slate Range and Pilot Knob Valley (Andrew et al, 2014a) and the Lava Mountains (Andrew et al, 2014b).…”

Section: ■ Geologic Settingmentioning

confidence: 99%

“…(3) a Late Jurassic biotite granite; (4) a Late Jurassic meta-andesite and volcaniclastic assemblage, which includes a distinctive felsite and/or meta-rhyolite in the southeastern Slate Range; and (5) middle Miocene volcanic and sedimentary rocks along the eastern range flank. Metavolcanic and older plutonic rocks have distinctive gneissic L-S tectonite fabrics (Dunne and Walker, 2004;Andrew et al, 2014a). These L-S tectonites, combined with the alaskite and meta-rhyolite, yield a unique clast assemblage sourced from the southern Slate Range.…”

Section: Southern Slate Rangementioning

confidence: 99%

“…2 and 3). We place these sedimentary rocks into the formation of Pilot Knob Valley (PKfm, defined originally in Andrew et al, 2014a) by using regional stratigraphic correlations and new age data (this paper and in Andrew et al, 2015) along with extensive recent geologic mapping (Smith, 2009;Rittase, 2012;Andrew et al, 2014aAndrew et al, , 2014b. Although the PKfm is locally faulted and folded, we interpret it as a single depositional package.…”

Section: Formation Of Pilot Knob Valleymentioning

confidence: 99%

“…Basin deformation and inversion are Pleistocene-Holocene in age and provide the opportunity to study earlier sedimentation patterns along the Garlock fault zone. Faults active during deposition of these rocks include the sinistral Garlock fault, a secondary Garlock fault strand named the Marine Gate fault (Andrew et al, 2014a), and the low-angle normal slip Searles Valley fault to the north in Searles Valley (Walker et al, 2005;Numelin et al, 2007).…”

Section: ■ Introductionmentioning

confidence: 99%

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Pliocene–Pleistocene basin evolution along the Garlock fault zone, Pilot Knob Valley, California

et al. 2020

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Exposed Pliocene–Pleistocene terrestrial strata provide an archive of the spatial and temporal development of a basin astride the sinistral Garlock fault in California. In the southern Slate Range and Pilot Knob Valley, an ~2000-m-thick package of Late Cenozoic strata has been uplifted and tilted to the northeast. We name this succession the formation of Pilot Knob Valley and provide new chronologic, stratigraphic, and provenance data for these rocks. The unit is divided into five members that record different source areas and depositional patterns: (1) the lowest exposed strata are conglomeratic rocks derived from Miocene Eagle Crags volcanic field to the south and east across the Garlock fault; (2) the second member consists mostly of fine-grained rocks with coarser material derived from both southern and northern sources; and (3) the upper three members are primarily coarse-grained conglomerates and sandstones derived from the adjacent Slate Range to the north. Tephrochronologic data from four ash samples bracket deposition of the second member to 3.6–3.3 Ma and the fourth member to between 1.1 and 0.6 Ma. A fifth tephrochronologic sample from rocks south of the Garlock fault near Christmas Canyon brackets deposition of a possible equivalent to the second member of the formation of Pilot Knob Valley at ca. 3.1 Ma. Although the age of the base of the lowest member is not directly dated, regional stratigraphic and tectonic associations suggest that the basin started forming ca. 4–5 Ma. By ca. 3.6 Ma, the northward progradation fanglomerate sourced in the Eagle Crags region waned, and subsequent deposition occurred in shallow lacustrine systems. At ca. 3.3 Ma, southward progradation of conglomerates derived from the Slate Range began. Circa 1.1 Ma, continued southward progradation of fanglomerate with Slate Range sources is characterized by a shift to coarser grain sizes, interpreted to reflect uplift of the Slate Range. Overall, basin architecture and the temporal evolution of different source regions were controlled by activity on three regionally important faults—the Garlock, the Marine Gate, and the Searles Valley faults. The timing and style of motions on these faults appear to be directly linked to patterns of basin development.

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Section: Strike-slip Faultsmentioning

confidence: 85%