Clockwise rotation and implications for northward drift of the western Transverse Ranges from paleomagnetism of the Piuma Member, Sespe Formation, near Malibu, California

Hillhouse, John W.

doi:10.1029/2010gc003047

Cited by 13 publications

(10 citation statements)

References 89 publications

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“…Orthoquartzite clasts were mainly sampled from thin, proximal colluvial deposits within a few meters of their Sespe bedrock sources. As discussed further below, the results of Hillhouse (2010) and this study indicate that the CRMs of Sespe orthoquartzite clasts predate weathering, transport, and deposition of the clasts and diagenesis of their sandstone matrix. A total of 92 Sespe clasts were collected, including 71 from the Miocene sections (30 from Piuma Road, 19 from Schueren Road, and 22 from the Santa Ana Mountains) and 21 from the Eocene section (Table 2).…”

Section: Detrital Zircon Analysismentioning

confidence: 51%

“…Paleomagnetic data from Piuma Member sandstones, collected in the same area that we collected orthoquartzite clasts along Piuma Road, have a tilt-corrected mean inclination of 39°± 6° (α 95 ) (Hillhouse, 2010). The CRM is carried by elongate, authigenic hematite that grew along cleavage planes within detrital biotite (Hillhouse, 2010). Because orthoquartzite clasts are generally devoid of detrital micas (Figs.…”

Section: Comparison Of Sespe Formation Clasts and Sandstone Matrixmentioning

confidence: 99%

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Grand Canyon provenance for orthoquartzite clasts in the lower Miocene of coastal southern California

et al. 2019

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Orthoquartzite detrital source regions in the Cordilleran interior yield clast populations with distinct spectra of paleomagnetic inclinations and detrital zircon ages that can be used to trace the provenance of gravels deposited along the western margin of the Cordilleran orogen. An inventory of characteristic remnant magnetizations (CRMs) from >700 sample cores from orthoquartzite source regions defines a low-inclination population of Neoproterozoic–Paleozoic age in the Mojave Desert–Death Valley region (and in correlative strata in Sonora, Mexico) and a moderate- to high-inclination population in the 1.1 Ga Shinumo Formation in eastern Grand Canyon. Detrital zircon ages can be used to distinguish Paleoproterozoic to mid-Mesoproterozoic (1.84–1.20 Ga) clasts derived from the central Arizona highlands region from clasts derived from younger sources that contain late Mesoproterozoic zircons (1.20–1.00 Ga). Characteristic paleomagnetic magnetizations were measured in 44 densely cemented orthoquartzite clasts, sampled from lower Miocene portions of the Sespe Formation in the Santa Monica and Santa Ana mountains and from a middle Eocene section in Simi Valley. Miocene Sespe clast inclinations define a bimodal population with modes near 15° and 45°. Eight samples from the steeper Miocene mode for which detrital zircon spectra were obtained all have spectra with peaks at 1.2, 1.4, and 1.7 Ga. One contains Paleozoic and Mesozoic peaks and is probably Jurassic. The remaining seven define a population of clasts with the distinctive combination of moderate to high inclination and a cosmopolitan age spectrum with abundant grains younger than 1.2 Ga. The moderate to high inclinations rule out a Mojave Desert–Death Valley or Sonoran region source population, and the cosmopolitan detrital zircon spectra rule out a central Arizona highlands source population. The Shinumo Formation, presently exposed only within a few hundred meters elevation of the bottom of eastern Grand Canyon, thus remains the only plausible, known source for the moderate- to high-inclination clast population. If so, then the Upper Granite Gorge of the eastern Grand Canyon had been eroded to within a few hundred meters of its current depth by early Miocene time (ca. 20 Ma). Such an unroofing event in the eastern Grand Canyon region is independently confirmed by (U-Th)/He thermochronology. Inclusion of the eastern Grand Canyon region in the Sespe drainage system is also independently supported by detrital zircon age spectra of Sespe sandstones. Collectively, these data define a mid-Tertiary, SW-flowing “Arizona River” drainage system between the rapidly eroding eastern Grand Canyon region and coastal California.

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Section: Detrital Zircon Analysismentioning

confidence: 51%

Section: Comparison Of Sespe Formation Clasts and Sandstone Matrixmentioning

confidence: 99%

Grand Canyon provenance for orthoquartzite clasts in the lower Miocene of coastal southern California

et al. 2019

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“…Tectonic and sediment processes shape the continental shelf, and these processes vary across our study area from San Francisco, CA (USA), to Reforma, Sinaloa (MX; Figure ). A complex history of oblique tectonics caused faulting and rotation of rifted crustal blocks to form prominent headlands such as Punta Eugenia and Point Conception (Atwater & Stock, ; Hillhouse, ; Ingersoll & Rumelhart, ; Nicholson, Sorlien, Atwater, Crowell, & Luyendyk, ). These physical processes change the slope, width and orientation of the coastline.…”

Section: Introductionmentioning

confidence: 99%

How sea level change mediates genetic divergence in coastal species across regions with varying tectonic and sediment processes

et al. 2018

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Plate tectonics and sediment processes control regional continental shelf topography. We examine the genetic consequences of how glacial-associated sea level change interacted with variable nearshore topography since the last glaciation. We reconstructed the size and distribution of areas suitable for tidal estuary formation from the last glacial maximum, ~20 thousand years ago, to present from San Francisco, California, USA (~38°N) to Reforma, Sinaloa, Mexico (~25°N). We assessed range-wide genetic structure and diversity of three codistributed tidal estuarine fishes (California Killifish, Shadow Goby, Longjaw Mudsucker) along ~4,600 km using mitochondrial control region and cytB sequence, and 16-20 microsatellite loci from a total of 524 individuals. Results show that glacial-associated sea level change limited estuarine habitat to few, widely separated refugia at glacial lowstand, and present-day genetic clades were sourced from specific refugia. Habitat increased during postglacial sea level rise and refugial populations admixed in newly formed habitats. Continental shelves with active tectonics and/or low sediment supply were steep and hosted fewer, smaller refugia with more genetically differentiated populations than on broader shelves. Approximate Bayesian computation favoured the refuge-recolonization scenarios from habitat models over isolation by distance and seaway alternatives, indicating isolation at lowstand is a major diversification mechanism among these estuarine (and perhaps other) coastal species. Because sea level change is a global phenomenon, we suggest this top-down physical control of extirpation-isolation-recolonization may be an important driver of genetic diversification in coastal taxa inhabiting other topographically complex coasts globally during the Mid- to Late Pleistocene and deeper timescales.

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“…Relative vertical-axis rotations between sampling sites can lead to an apparent E-W elongation, which is not related to inclination shallowing. Kodama (2012) pointed out that the E-I method led to an over-correction of inclination shallowing in Oligocene-Miocene redbeds from coastal California (Hillhouse, 2010), where the over-correction was attributed to unrecognized vertical-axis rotations. Fourth, the TK03.GAD model assumes hemispheric symmetry of the geomagnetic field.…”

Section: The Elongation/inclination (E-i) Approachmentioning

confidence: 99%

Detecting and Correcting for Paleomagnetic Inclination Shallowing of Sedimentary Rocks: A Review

Kodama

2016

Front. Earth Sci.

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Magnetic anisotropy and the elongation/inclination (E-I) approaches have been increasingly employed as two important means for detecting and correcting the paleomagnetic inclination shallowing in sedimentary rocks that was first recognized 60 years ago. Both approaches are based on certain assumptions, and thus have advantages and intrinsic limitations in investigating shallow inclinations in sedimentary rocks. The E-I approach is relatively easy to use, but it needs a large dataset to adequately sample paleomagnetic directions due to paleosecular variation (PSV) of the geomagnetic field. Also, slow sediment accumulation rates (SARs) and local tectonics could lead to under-or over-corrections using the E-I approach. For the magnetic anisotropy technique, labor-intensive, sophisticated laboratory rock magnetic experiments are required in order to accurately determine both bulk magnetic anisotropy of remanence-carrying grains and magnetic anisotropy of an individual particle, i.e., "a" factor, of samples. Our review shows that, despite the intensive laboratory work necessary for applying anisotropy-based inclination corrections, it is worth investing the effort. In addition, the joint use of magnetic susceptibility and remanence anisotropy measurements as well as detailed rock magnetic measurements for determining the particle anisotropy "a" factor have the advantage of retrieving direct evidence of inclination shallowing and correcting for it with high confidence. We caution against use of either of the two approaches without full appreciation of the underlying assumptions and intrinsic limitations of each technique. The use and comparison of both techniques could provide the most robust inclination shallowing correction for sedimentary rocks.

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Clockwise rotation and implications for northward drift of the western Transverse Ranges from paleomagnetism of the Piuma Member, Sespe Formation, near Malibu, California

Cited by 13 publications

References 89 publications

Grand Canyon provenance for orthoquartzite clasts in the lower Miocene of coastal southern California

Grand Canyon provenance for orthoquartzite clasts in the lower Miocene of coastal southern California

How sea level change mediates genetic divergence in coastal species across regions with varying tectonic and sediment processes

Detecting and Correcting for Paleomagnetic Inclination Shallowing of Sedimentary Rocks: A Review

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