Geologic and Tectonic History of the Gulf of California

Moore, David G.; Curray, Joseph R.

doi:10.2973/dsdp.proc.64.169.1982

Cited by 19 publications

(15 citation statements)

References 18 publications

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“…The structural geology of the region is determined by two, short, rifting axes separated by a short minor transform fault and confined by two long transform faults. The basin is in an active rift zone and has a typical oceanic crust (Moore et al, 1978). The heat flow in the basin is uneven and ranges up to about 30 µcal cm" 2 g~1.…”

Section: Guaymas Basinmentioning

confidence: 99%

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Галимов¹,

Simoneit²

1982

Initial Reports of the Deep Sea Drilling Project

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We analyzed interstitial gases from holes at Sites 474, 477, 478, 479, and 481 in the Gulf of California, using gas chromatography and stable isotope mass spectrometry to evaluate their composition in terms of biogenic and thermogenic sources. The hydrocarbon gas (C1-C5) concentrations were comparable to the shipboard data, and no olefins could be detected. The δ 13 C data for the CH 4 confirmed the effects of thermal stress on the sedimentary organic matter, because the values were typically biogenic near the surface and became more depleted in 12 C versus depth in holes at Sites 474, 478, and 481. The CH 4 at Site 477 was the heaviest, and in Hole 479 it did not show a dominant hightemperature component. The CO 2 at depth in most holes was mostly thermogenic and derived from carbonates. The low concentrations of C 2 -C 5 hydrocarbons in the headspace gas of canned sediments precluded a stable carbon-isotope analysis of their genetic origin.

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Section: Guaymas Basinmentioning

confidence: 99%

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Галимов¹,

Simoneit²

1982

Initial Reports of the Deep Sea Drilling Project

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“…Geological estimates of the opening of the Gulf of California are also placed around 5.5 Ma (Moore and Curray, 1982;Molina, 1994), and C. anisopoma is geographically restricted to the Gulf of California. Both species' range limits are restricted from the tropical southern tip of the peninsula (Laguna, 1990), so the last genetic contact between these species may have occurred during late Miocene-Pliocene cooling (Savin et al, 1985;McDougal et al, 1999).…”

Section: Timeline Of Speciationmentioning

confidence: 99%

“…This study includes species that may have been isolated following two well-known geological events: the closure of the Panamanian Isthmus 3-3.5 Ma (Keigwin, 1978;Coates and Obando, 1996) and the opening of the Gulf of California 5.5 Ma (Moore and Curray, 1982). However, paradoxically, it is also clear that intertidal species do not require strong geographic boundaries to promote speciation (Palumbi, 1994).…”

Section: Introductionmentioning

confidence: 99%

Patterns of Speciation Inferred from Mitochondrial DNA in North American Chthamalus (Cirripedia: Balanomorpha: Chthamaloidea)

Wares

2001

Molecular Phylogenetics and Evolution

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“…From its location and shape, this basin appears to be formed by a half graben, the main fault located to the NE. This basin may have been developed coincident with the collision of the Rivera Plate as a pull-apart basin or by block rotation in an oblique subduction system, that is compatible with the structural transform regime during the last 5.5 my, and basically overlaps the older extensional tectonics (Moore and Curray 1982). Some compressional structures are observed near the eastern flank of the TME.…”

Section: Significance Of the Mcs Refraction And Wideangle Datamentioning

confidence: 83%

Crustal Architecture at the Collision Zone Between Rivera and North American Plates at the Jalisco Block: Tsujal Project

Dañobeitia

Bartolomé

Prada

et al. 2016

Pure Appl. Geophys.

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Abstract-Processing and analysis of new multichannel seismic records, coincident with wide-angle seismic profiles, acquired in the framework of the TsuJal project allow us to investigate in detail the complex structure of the oceanic domain in the collision zone between Rivera Plate and Block Jalisco at its northern termination. The subducting Rivera Plate, which is overridden by the North American Plate-Jalisco Block, is clearly identified up to 21.5°N (just south of Maria Magdalena Island) as a two clear reflections that we interpret as the interplate and Moho discontinuities. North of the Tres Marias Islands the seismic images display a different tectonic scenario with structures that are consistent with large faulting and rifted margin. A two-dimensional velocity approach for the crustal geometry is achieved using joint refraction/reflection travel time tomography, the uncertainty of the results is assessed by means of Monte Carlo analysis. Our results show an average oceanic crustal thickness of 6-7 km with a moderate increase towards the Jalisco Block, an anomalous thick layers (*3.0 km) displaying a relatively low velocity (*5.5 km/s) underneath Maria Magdalena Rise, and an estimated Moho depth deeper than 15 km in the collision zone between Rivera Plate and Jalisco Block. We have also determined an anomalous crust on the western flank of the Tres Marias Islands, which may be related to the initial phases of continental breakup of the Baja California Peninsula and Mexico mainland. High-resolution bathymetry provides remarkable images of intensive slope instabilities marked by relatively large slides scars of more than 40 km 2 extent, and mass-wasting deposits probably triggered by the intense seismicity in the area.

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Geologic and Tectonic History of the Gulf of California

Cited by 19 publications

References 18 publications

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Geochemistry of Interstitial Gases in Sedimentary Deposits of the Gulf of California, Deep Sea Drilling Project Leg 64

Patterns of Speciation Inferred from Mitochondrial DNA in North American Chthamalus (Cirripedia: Balanomorpha: Chthamaloidea)

Crustal Architecture at the Collision Zone Between Rivera and North American Plates at the Jalisco Block: Tsujal Project

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