Geologic map of the Santa Paula Peak Quadrangle, California

Dibblee, T.W.

doi:10.3133/ofr8273

Cited by 16 publications

(44 citation statements)

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“…The Monterey Formation was sampled from two isolated exposures, and these are referred to as Monterey-1 and -2. All exposures were located using 1:24,000 scale geological maps [Dibblee, 1987[Dibblee, , 1990.…”

mentioning

confidence: 99%

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes

Komada

Druffel

Hwang

2005

Global Biogeochemical Cycles

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Chemical and isotopic variability of particulate organic carbon (POC) was examined in samples from the Santa Clara River watershed and adjacent shelf to investigate the processing of fossil POC derived from bedrock. The Santa Clara is a small coastal river that drains mountainous terrain in southern California, United States. Organic carbon in shale, river suspended sediment, and coastal marine sediment was separated into three operationally defined organic compound classes: total extractable lipids, acid hydrolyzable material, and the nonhydrolyzable residue. In all samples, the nonhydrolyzable fraction was dominant (∼50% of POC), while lipids and acid hydrolyzable moieties were relatively minor (≤22 and ≤13%, respectively). The Δ14C and δ13C signatures of the isolated fractions varied dramatically, not only across different sample types, but also for a given sample. At the shale exposure, low Δ14C values (<−760‰) indicated dominance of ancient C in all three organic compound classes. In downstream samples, the extractable lipids displayed the lowest Δ14C values (<−500‰), while the acid hydrolyzable fraction was predominantly modern (Δ14C > −30‰). The nonhydrolyzable fraction displayed intermediate Δ14C values (<−190‰) that increased steadily downstream with decreasing δ13C values (−22.2 to −25.0‰), possibly from mixing of shale and surface soil POC. Our results indicate that most of the fossil POC discharged by the Santa Clara is composed of non‐acid hydrolyzable material, but its elusive molecular structure and marine‐like δ13C signature may render its detection in the ocean difficult. In contrast, fossil lipids may be more amenable to detection if their resistant components (e.g., asphaltic material) are unique to crustal sources.

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mentioning

confidence: 99%

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes

Komada

Druffel

Hwang

2005

Global Biogeochemical Cycles

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“…This trough was described as a Miocene rift by Yeats et al (1994), with its southwest margin reactivated as the Santa Susana reverse fault, resulting in basin inversion. The northwest end of this trough is exposed in the Topatopa Mountains north of Fillmore and east of Sespe Creek in the Cobblestone Mountain and Piru Quadrangles (Huftile and Yeats, 1995;Dibblee, 1990Dibblee, , 1996cDibblee, , 1996dYeats, 2001), where it includes the five-fold subdivision of the type Modelo Formation (Eldridge and Arnold, 1907, as revised by Kew, 1924Kew, , but following Çemen, 1989, by excluding the lower Miocene Rincon Formation from the lowermost shale member). Deep wells drilled in Castaic Junction and Newhall-Potrero Oil Fields and in the Pico anticline in search of oil accumulations in pre-Miocene strata (Yeats et al, 1994) disclosed how thick the middle and early late Miocene sequence is in the subsurface.…”

Section: West Of the San Gabriel Faultmentioning

confidence: 98%

“…Geologic quadrangle maps were published by the California Division of Mines and Geology (now the California Geological Survey), including the south half of the Mint Canyon Quadrangle (Saul and Wootton, 1983), the northeast quarter of the Newhall Quadrangle (Smith, 1984), the west half of the Newhall Quadrangle (Treiman, 1986), and detailed studies along the San Gabriel fault (Weber, 1979(Weber, , 1982(Weber, , 1986Kahle, 1986). The Dibblee Foundation has published geological maps at 1:24,000 scale covering the entire area (Dibblee, 1991;1993;1996a, 1996b1997a, 1997b.…”

Section: Previous Workmentioning

confidence: 99%

Ridge Basin and San Gabriel Fault in the Castaic Lowland, Southern California

Yeats¹,

Stitt²

2003

Evolution of Ridge Basin, Southern California: An Interplay of Sedimentation and Tectonics

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In the Castaic Lowland, the Ridge Basin is overlain unconformably at its southeastern end by Fernando and Saugus Formations, which were deposited after folding of the Ridge Basin syncline. The area southwest of the San Gabriel fault is underlain by a subsurface ridge of basement rocks overlain by lower Mohnian and younger strata. The southwest boundary of the basement ridge is the faulted margin of a

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“…Folds referred to in text: ABS-Agua Blanca syncline, BHS-Bear Heaven syncline, HA-Hopper anticline, TA-Temescal anticline. Structural data from Jennings and Strand (1969) and Dibblee (1988Dibblee ( , 1990aDibblee ( , 1990bDibblee ( , 1991Dibblee ( , 1992aDibblee ( , 1992bDibblee ( , 1993Dibblee ( , 1996aDibblee ( , 1996bDibblee ( , 1997). …”

Section: Cleavagementioning

confidence: 99%

“…1) for study because: (1) it is part of an active fold and thrust belt; (2) it has a well-known stratigraphic sequence nearly 13 000 m thick, more than adequate for pressure solution processes to be operative (Figs. 2A and B,3); (3) the section contains diverse rock types that manifest penetrative deformation in various ways; (4) it was only locally affected by prePliocene deformational events; (5) detailed 1:24 000-scale geologic maps exist for the entire area (Dibblee, 1988(Dibblee, , 1990a1990b;, 1992a, 1992b, 1993, 1996a1996b;1997); (6) the subsurface thermal profile is well documented (Fig. 2B); and (7) we can demonstrate that the major penetrative structural element, a tectonically induced, pressure solution cleavage, formed during a single, Pliocene-to-present, shortening event.…”

Section: Introductionmentioning

confidence: 99%

Penetrative strain at shallow crustal levels: The role of pressure solution in accommodating regional shortening strain, Ventura basin, western Transverse Ranges, California

Duebendorfer¹,

Meyer

2002

Contributions to Crustal Evolution of the Southwestern United States

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The Ventura basin is part of an active (Pliocene-to-present) fold-and-thrust belt in which nearly 13,000 m of Cenozoic section is exposed. We examined this section in five cross-strike traverses to evaluate the possibility that penetrative deformation contributed measurably to regional shortening. We conducted structural analysis of cleavage-bedding orientations, microstructural and cathodoluminescence analysis of oriented thin sections, and two-dimensional strain analysis using the Fry technique and its variants to obtain semiquantitative estimates of shortening strain due to pressure solution.Macroscopic features indicative of pressure solution are present in rocks as young as Pliocene and include a spaced, bedding-normal cleavage and cobble interpenetrations. Microscopic deformational features include concavo-convex, sutured, or long (straight) grain boundaries, preferred grain-shape fabric, and selvages of insoluble material concentrated in cleavage domains. Upon restoration of bedding to horizontal, the mean cleavage orientation for four of the five traverses is 102Њ, consistent with regional Pliocene-to-present, north-south shortening. Restored cleavage orientations are more homogeneous than the raw (measured) data suggesting that cleavage formed by layer-parallel shortening prior to folding, or early in the deformational history.To obtain a first-order estimate of penetrative strain due to pressure solution, we conducted two-dimensional strain analysis on 30 samples using the normalized and enhanced normalized Fry methods. We used both Erslev's INSTRAIN fabric analysis program and a manual best-fit method to determine the shape of the strain ellipse in two dimensions (XZ). Despite a wide scatter in results from individual samples for each method, shortening values averaged 25% percent for the manual technique and 27% for INSTRAIN determinations. When the large errors calculated by INSTRAIN are taken into account, the minimum shortening strains are 17% for the INSTRAIN method and 19% for the manual best-fit method. These values of shortening strain are remarkably similar to values from other fold-and-thrust belts.Although we recognize that our reconnaissance-level strain analysis of rocks from the Ventura basin is just a first step toward characterizing penetrative strain within Duebendorfer, E.M., and Meyer, K.L., 2002, Penetrative strain at shallow crustal levels: The role of pressure solution in accommodating regional shortening strain, Ventura basin, western Transverse Ranges, California, in Barth, A., ed., Contributions to Crustal Evolution of the Southwestern

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Geologic map of the Santa Paula Peak Quadrangle, California

Cited by 16 publications

References 0 publications

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes

Ridge Basin and San Gabriel Fault in the Castaic Lowland, Southern California

Penetrative strain at shallow crustal levels: The role of pressure solution in accommodating regional shortening strain, Ventura basin, western Transverse Ranges, California

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Geologic map of the Santa Paula Peak Quadrangle, California

Cited by 16 publications

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Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ14C and δ13C signatures of organic compound classes

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ14C and δ13C signatures of organic compound classes

Ridge Basin and San Gabriel Fault in the Castaic Lowland, Southern California

Penetrative strain at shallow crustal levels: The role of pressure solution in accommodating regional shortening strain, Ventura basin, western Transverse Ranges, California

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Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes

Sedimentary rocks as sources of ancient organic carbon to the ocean: An investigation through Δ¹⁴C and δ¹³C signatures of organic compound classes