Cenozoic volcanism and two-stage extension in the Salton trough, southern California and northern Baja California

Herzig, Charles T.; Jacobs, David

doi:10.1130/0091-7613(1994)022<0991:cvatse>2.3.co;2

Cited by 32 publications

(37 citation statements)

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“…[25] One of the major results of our study is that the mantle source beneath the basin is very similar, if not identical, to the mantle source of Pacific N-MORB. This confirms and strengthens previous results showing that the Gulf of California region, including Salton Trough, has been underlain by the Pacific mantle since late Miocene [e.g., Hawkins and Myers, 1972;Batiza et al, 1979;Saunders et al, 1982aSaunders et al, , 1982bSawlan, 1991;Herzig and Jacobs, 1994]. It is surprising, however, given the young age ($3.5 Ma) of the basin, that there seems to be no indication of continental mantle or crust and subduction component contamination in any of the Alarcon lavas.…”

Section: Origin Of the Pacific Morb Mantle Source Beneath The Gulf Ofsupporting

confidence: 91%

Petrology of Alarcon Rise lavas, Gulf of California: Nascent intracontinental ocean crust

et al. 2002

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[1] The Alarcon Basin in the southern Gulf of California originated by intracontinental rifting of the southwestern margin of North America and has evolved into an intercontinental ocean basin by 3.7 m.y. of seafloor spreading. Lava samples collected on the axial ridge along Alarcon Rise, two of the many near-axis seamounts on the northwest flank of the rise, and an abyssal hill on 0.6 Ma crust on the southeast flank were examined petrographically and analyzed for major and trace element and He-Sr-Nd-Pb isotope composition. Most samples are typical mid-ocean ridge basalt (MORB), but rocks at the axial ridge site closest to continent are more differentiated. Rocks from the axial ridge and abyssal hill are genetically related through separate episodes of fractional crystallization. Seamount samples are relatively more primitive than seafloor samples and may have been formed by smaller degree of melting of the same mantle source as the seafloor lavas. Tamayo transform fault has no apparent effect on the geochemistry of axial ridge lavas erupted close to it; this is contrary to the postulated transform fault effect. Alarcon Basin differs from the Salton Trough and Guaymas Basin in that its youngest seafloor shows no evidence for contamination with continental crust or a subduction component. We propose that Pacific MORB source mantle underlies the Gulf of California because the western North American margin has overridden the Pacific suboceanic mantle. Miocene rifting and Pliocene spreading in Alarcon Basin have created a window allowing the most recent MORB melts to rise uncontaminated to the surface.

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Section: Origin Of the Pacific Morb Mantle Source Beneath The Gulf Ofsupporting

confidence: 91%

Petrology of Alarcon Rise lavas, Gulf of California: Nascent intracontinental ocean crust

et al. 2002

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“…The idea that the Salton trough perhaps initially formed during the Middle Miocene as a half graben in the course of Basin and Range extension (Crowell 1987) before transtensional tectonism affected the area is in agreement with findings by Herzig and Jacobs (1994) who investigated the geochemistry of Cenozoic volcanites. They interpreted Oligocene-Miocene alkaline lavas to be related to Basin and Range extension and post-4 Ma subalkaline subsurface basalt and basalt xenoliths in Quaternary rhyolites to the present geodynamic regime.…”

Section: San Andreas Transform Systemsupporting

confidence: 57%

“…9; Muffler and Doe 1968;Sharp 1982) and since the surface of the Salton Sea already lies 74 m below sea level. Moreover, there are indications that the Salton trough is at least partly floored by oceanic/basic crust (Elders et al 1972;Fuis et al 1982;Lachenbruch et al 1985;Herzig and Jacobs 1994). Modelling of geophysical data resulted in the interpretation that the Moho is as shallow as 22 km to 23.5 km beneath the Salton trough (Elders et al 1972;Fuis et al 1982;Lachenbruch et al 1985).…”

Section: San Andreas Transform Systemmentioning

confidence: 94%

“…These rhyolites are the only known late Quaternary volcanites closely associated with the San Andreas transform zone north of the Gulf of California (Sharp 1982). Comparing the recent regional volcanism with that of the African-Arabian rift system, Herzig and Jacobs (1994) considered the Salton trough's volcanism "insignificant. "…”

Section: San Andreas Transform Systemmentioning

confidence: 99%

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Continental strike-slip rifts and their stratigraphic signature: application to the Bangong/Nujiang zone (Tibet) and the South Penninic zone (Alps)

Mattern

Schneider

Wang

et al. 1998

Geologische Rundschau

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Our literature studies show that the thermal regime along continental strike-slip rifts is inconspicuous and that they are "low-volcanicity rifts" at best. Along with that, young continental strike-slip rifts exhibit no signs of major thermally controlled doming. We suggest that the larger the strike-slip component of a rift is, the less likely major thermal doming is causally associated with the rift zone. Since vertical lithosphere movements are reflected in the stratigraphic record of a rifted area, different rift modes (strike-slip, dip-slip) may be distinguished by analyzing the relevant sequences. Two ancient and especially suitable strike-slip rift margins in Tethyan mountain belts, the Bangong/Nujiang zone of Tibet and the South Penninic zone of the Alps, were analyzed with regard to their uplift history. The results confirm recent regional rift models which indicate in both cases that rifting was dominated by strike-slip. The stratigraphic approach may provide significant clues as to the mode of paleorifting when structural data are unavailable.

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“…Zhang et al, 2013), this geochemical fingerprint does not necessarily imply an oceanic formation environment because MORB signatures are also observed in mafic rocks that intruded continental crust during initial rifting (e.g. Herzig and Jacobs, 1994;Leventhal et al, 1995;Rubatto et al, 1998;Casado et al, 2001).…”

Section: The Neoproterozoic Metamorphism and Its Geological Significancementioning

confidence: 95%

The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism

et al. 2017

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Cenozoic volcanism and two-stage extension in the Salton trough, southern California and northern Baja California

Cited by 32 publications

References 0 publications

Petrology of Alarcon Rise lavas, Gulf of California: Nascent intracontinental ocean crust

Petrology of Alarcon Rise lavas, Gulf of California: Nascent intracontinental ocean crust

Continental strike-slip rifts and their stratigraphic signature: application to the Bangong/Nujiang zone (Tibet) and the South Penninic zone (Alps)

The multi-stage tectonic evolution of the Xitieshan terrane, North Qaidam orogen, western China: From Grenville-age orogeny to early-Paleozoic ultrahigh-pressure metamorphism

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