Origin of bimodal volcanism, southern Basin and Range province, west-central Arizona

Suneson, Neil H.; Lucchitta, Ivo

doi:10.1130/0016-7606(1983)94<1005:oobvsb>2.0.co;2

Cited by 73 publications

(55 citation statements)

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“…The sites of bimodal volcanism that are related to remelting of silica-rich continental crust are typically associated with zones of continental rifting ( Suneson and Lucchitta, 1983;Bachmann and Bergantz, 2008;Li et al, 2010 ). Regardless of the specific geological settings, however, the SiO 2 -rich melts are formed, in particular, due to interaction of the previously existing felsic rocks with the high-temperature mantle-derived melts that provide heat sources for melting of crustal materials (e.g., Annen et al, 2006 ).…”

Section: Discussion: Characteristics and Potential Modes Of Emplacementmentioning

confidence: 98%

The lunar Gruithuisen silicic extrusive domes: Topographic configuration, morphology, ages, and internal structure

Иванов

Head

Bystrov

2016

Icarus

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Section: Discussion: Characteristics and Potential Modes Of Emplacementmentioning

confidence: 98%

The lunar Gruithuisen silicic extrusive domes: Topographic configuration, morphology, ages, and internal structure

Иванов

Head

Bystrov

2016

Icarus

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“…Lucchitta & Suneson (1981) reported that the major detachment fault in the Rawhide Mountains dips at a gentle inclination to the NE under rocks that are continuous with undeformed rocks of the Colorado Plateau. ~The fault there juxtaposes upper-crustal rocks--Tertiary strata and their basement of coarse-grained Proterozoic granite --upon mid-crustal mylonitic gneiss (Shackelford 1976;Suneson 1980). This juxtaposition suggests that substantial crustal section was cut out where the exposed fault system roots.…”

Section: Initial Dip Of Faultsmentioning

confidence: 97%

Crustal extension along a rooted system of imbricate low-angle faults: Colorado River extensional corridor, California and Arizona

Howard

John²

1987

145

150

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Summary The upper 10 to 15 km of crystalline crust in the 100-km-wide Colorado River extensional corridor of mid-Tertiary age underwent extension along an imbricate system of gently dipping normal faults. Detachment faults cut gently down-section eastward in the direction of tectonic transport from a headwall breakaway, best expressed in the Old Woman Mountains, California. Successively higher and more distal allochthons are displaced farther from the headwall, some as much as tens of kilometres. The basal fault(s) cut initially to depths of 10 to 15 km, the palaeothickness of a tilted allochthonous slab of basement rocks above the Chemehuevi-Whipple Mountains detachment fault(s). Hanging wall blocks tilt consistently toward the headwall as shown by dips of capping Tertiary strata and of originally horizontal Proterozoic diabase dykes. Block tilts and the degree of extension increase northeastward across much of the corridor. The faults are interpreted as rooting under the unbroken Hualapai Mountains and Colorado Plateau on the down-dip side of the corridor in Arizona. Slip on faults at all exposed levels of the crust was unidirectional, and totals an estimated 50 km. These data and inferences support the concept that the crust in California moved out from under Arizona along a rooted, normal-slip shear system. Brittle thinning above the sole faults affected the entire upper crust, and in places wholly removed it along the central part of the corridor. Upwarp exposed metamorphic core complexes in footwall domes.

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“…Lipman and others (1972) and Christiansen and Lipman (1972) suggested that the change from calc-alkalic intermediate volcanism to a bimodal rhyolite-basalt suite marked the change from regional compression to extension. Even though bimodal suites form during periods of extension in the Basin and Range province (e.g., Suneson and Lucchitta, 1983), recent work suggests that volcanism before and during the main pulses of extension is mainly calc-alkalic or alkalic-calcic with basaltic-andesite, andesite, and dacite predominating (Eaton, 1982;Anderson, 1973;Elston and Bomhorst, 1979;Smith, 1982;Otton, 1982). The tectonic transition between regional compression and extension may pass without affecting the nature of magmatic activity.…”

Section: Discussionmentioning

confidence: 95%

Chapter 10: Mid-Miocene volcanic and plutonic rocks in the Lake Mead area of Nevada and Arizona; Production of intermediate igneous rocks in an extensional environment

Smith¹,

Feuerbach²,

Naumann³

et al. 1990

Geological Society of America Memoirs

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Middle Tertiary volcanic rocks of the Lake Mead field are calc-alkalic to alkalic-calcic and vary continuously in composition from basalt to rhyolite. These volcanic rocks formed during Basin-and-Range extension and are spatially and genetically associated with diorite-to-granite intrusions of the Wilson Ridge pluton. Locally, igneous rocks were subjected to potassium metasomatism.Field relations and petrography provide evidence of disequilibrium mineral assemblages and liquid-liquid mixing of basalt and granite magmas to form the intermediate rock types of the Lake Mead volcanic field. Evidence of mixing includes incompatible phase assemblages of euhedral olivine, embayed quartz, and sodic plagioclase within andesite flows. Plagioclase occurs in rounded and partially resorbed clusters of equant crystals and commonly displays oscillatory zoning and outer glass-charged zones (fretted texture). Quartz phenocrysts are commonly surrounded by rims of prismatic augite and glass. Fine-grained spheroidal to ellipsoidal inclusions of basalt are common in dacite flows and dikes. Thus, various mixing ratios of olivine basalt and granite end members may be responsible for the textural variations observed in volcanic rocks of the Lake Mead field.The evolution of the igneous rocks of the Lake Mead field was evaluated by petrogenetic models involving both crystal fractionation and magma mixing. These processes may have operated together to produce the compositional range in volcanic and plutonic rocks of the Lake Mead area. Open-system models provide estimates of the relative importance of the two processes and suggest that mixing was more important in the derivation of andesite and diorite (mass mixed component/mass crystallizing phase R = 0.8 to 2.2) than dacite, quartz monzonite, or granite (R = 0.1 to 0.65).The calc-alkaline-alkalic-calcic nature of the igneous rocks of the Lake Mead field, and possibly other similar rock suites that formed in the Great Basin during regional extension, may result from magma mixing. Basalts and rhyolites may mechanically mix in various proportions to produce intermediate rock types. The classic bimodal assemblages may only occur where mixing is incomplete or in structural situations where different magma types cannot mix. Smith, E. I., Feuerbach, D. L., Naumann, T. R., and Mills, J. G., 1990, Mid-Miocene volcanic and plutonic rocks in the Lake Mead area of Nevada and Arizona; Production of intermediate igneous rocks in an extensional environment, in Anderson, J. L., ed., The nature and origin of Cordilleran magmatism: Boulder, Colorado,

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Origin of bimodal volcanism, southern Basin and Range province, west-central Arizona

Cited by 73 publications

References 0 publications

The lunar Gruithuisen silicic extrusive domes: Topographic configuration, morphology, ages, and internal structure

The lunar Gruithuisen silicic extrusive domes: Topographic configuration, morphology, ages, and internal structure

Crustal extension along a rooted system of imbricate low-angle faults: Colorado River extensional corridor, California and Arizona

Chapter 10: Mid-Miocene volcanic and plutonic rocks in the Lake Mead area of Nevada and Arizona; Production of intermediate igneous rocks in an extensional environment

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