Crust-mantle interaction in continental arcs: inferences from the Mesozoic arc in the southwestern United States

Asmerom, Yemane; Patchett, P. Jonathan; Damon, Paul E.

doi:10.1007/bf00311190

Cited by 26 publications

(16 citation statements)

References 29 publications

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“…Ewart, 1979Ewart, , 1982Saunders et al, 1980). The initial Nd isotopic composition of a representative rhyolite from the Ali Molina Formation, ε Nd = -8.5, is consistent with this conclusion (Asmerom et al, 1991).…”

Section: Rhyolitesupporting

confidence: 75%

“…Other Jurassic igneous rocks in south-central Arizona, ranging in composition from diorite to granite and rhyolite, have moderately negative ε Nd , -9 to -4 (Farmer and DePaolo, 1984;Asmerom et al, 1991). These are normal values for a continental magmatic arc.…”

Section: Petrogenetic Relations Of Rhyolite Basalt and Comenditementioning

confidence: 91%

“…10). Their initial Nd isotopic composition, ε Nd = +2.0, further argues that these basalts are not petrogenetically related to arc magmatism (Asmerom et al, 1991).…”

Section: Basaltmentioning

confidence: 99%

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Middle Jurassic Topawa Group, Baboquivari Mountains, south-central Arizona: Volcanic and sedimentary record of deep basins within the Jurassic magmatic arc

Haxel¹,

Wright²,

Riggs³

et al. 2005

The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives

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Among supracrustal sequences of the Jurassic magmatic arc of the southwestern Cordillera, the Middle Jurassic Topawa Group, Baboquivari Mountains, south-central Arizona, is remarkable for its lithologic diversity and substantial stratigraphic thickness, ≈8 km. The Topawa Group comprises four units (in order of decreasing age): (1) Ali Molina Formation-largely pyroclastic rhyolite with interlayered eolian and fl uvial arenite, and overlying conglomerate and sandstone; (2) Pitoikam Formation-conglomerate, sedimentary breccia, and sandstone overlain by interbedded siltstone and sandstone; (3) Mulberry Wash Formation-rhyolite lava fl ows, fl ow breccias, and mass-fl ow breccias, with intercalated intraformational conglomerate, sedimentary breccia, and sandstone, plus sparse within-plate alkali basalt and comendite in the upper part; and (4) Tinaja Spring Porphyry-intrusive rhyolite. The Mulberry Wash alkali basalt and comendite are genetically unrelated to the dominant calcalkaline rhyolite. U-Pb isotopic analyses of zircon from volcanic and intrusive rocks indicate the Topawa Group, despite its considerable thickness, represents only several million years of Middle Jurassic time, between approximately 170 and 165 Ma.

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Section: Rhyolitesupporting

confidence: 75%

Section: Petrogenetic Relations Of Rhyolite Basalt and Comenditementioning

confidence: 91%

See 1 more Smart Citation

Middle Jurassic Topawa Group, Baboquivari Mountains, south-central Arizona: Volcanic and sedimentary record of deep basins within the Jurassic magmatic arc

Haxel¹,

Wright²,

Riggs³

et al. 2005

The Mojave-Sonora Megashear Hypothesis: Development, Assessment, and Alternatives

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show abstract

“…Esta é uma característica observada em ambientes de arcos continentais por causa das interações entre magmas juvenis e componentes enriquecidos (litosfera mais antiga) em margens ativas (e.g. DePaolo, 1981DePaolo, , 1988Asmeron et al, 1991;Ducea, 2001). …”

Section: Resul Resul Resul Resul Results T T T Tados Iso Ados Iso Adosunclassified

Magmatismo há ca. 660 - 640 Ma no Domínio Socorro: registros de convergência pré-colisional na aglutinação do Gondwana Ocidental

Hackspacher

Fetter

Ebert

et al. 2003

Geol. USP, Sér. cient.

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Palavras-chave: convergência pré-colisional, Neoproterozóico, Província Mantiqueira. RESUMOIdades U-Pb em zircão com valores entre 660 e 640 Ma, obtidas em uma série de ortognaisses e plútons de afinidades cálcio-alcalinas, no sudeste da Província Mantiqueira Central, sugerem que um importante período de magmatismo cordilherano ocorreu nesta região antes da etapa colisional da aglutinação do Gondwana Ocidental (até então reportado ao período entre 625 e 580 Ma). A natureza isotópica deste magmatismo ainda não foi bem caracterizada, no entanto, alguns dados isotópicos Sm-Nd preliminares sugerem que estes magmas não foram derivados exclusivamente de litosfera paleoproterozóica, mas constituem produtos híbridos de fontes paleoproterozóicas e neoproterozóicas. Tais misturas são comumente observadas em ambiente de arcos continentais. É possível que as rochas com idades entre 660 e 640 Ma representem um magmatismo de arco tipo cordilherano, resultado da subducção de crosta oceânica Neoproterozóica durante a convergência pré-colisional e fechamento de oceano (nesta região de ligação entre Adamastor e Goianides).Keywords: precollisional convergence, Neoproterozoic, Mantiqueira Province. ABSTRACTUranium-lead zircon ages between 660 and 640 Ma, obtained from a series of calc-alkaline orthogneisses and plutons in southeast Brazil's Central Mantiqueira Province, suggest that a significant period of magmatism occurred in this region prior to the collisional assembly of West Gondwana (presently constrained in the region between ca. 625 and 580 Ma). While the nature of this earlier magmatism is presently unclear, some preliminary Sm-Nd data suggest that these magmas were not solely derived from the Paleoproterozoic lithosphere, but appear to represent hybrid products of Paleoproterozoic and Neoproterozoic sources. As such hybrid mixtures have been most commonly observed in continental arc settings, it is possible that the 660 to 640 Ma magmatism represents arc magmatism that resulted from subduction of Neoproterozoic oceanic crust during early precollisional convergence and closure of a branch of either the Adamastor or Goianides oceans.

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“…Isotherms modified from Lindsley (1983) to P=1 kbar Fig. 8 Cartoon illustrating the mafic-felsic magmas interaction within the Salmas pluton magma chamber is an important process (Neves and Vauchez 1995), which may occur in different environments such as plutonic (Hibbard 1991), volcanic, and subvolcanic (Castro et al 1990) and in various tectonic settings such as continental arcs (Zorpi et al 1989), island arcs (Asmerom et al 1991), back arc basins (Barnes et al 1995), or ocean spreading ridges (Rhodes et al 1979). In all these environments or tectonic settings, the interaction of two different magmas is preserved in a range of ways.…”

Section: Proposed Magma Mixing Modelmentioning

confidence: 99%

Magma mixing/mingling in Salmas granodiorite, NW Iran: evidence from mafic microgranular enclaves

Ghaffari

Rashidnejad‐Omran

2014

Arab J Geosci

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The interaction of mafic-intermediate and felsic rocks of the Salmas plutonic rocks produced mixed rocks (granodiorites) which contain mafic microgranular enclaves (MMEs). Enclaves ranging from a few millimeters to centimeters in size, and from ellipsoidal to rounded in shape. Based on both field observation and mineralogical compositions, MMEs are composed of quartz diorite whereas the felsic host rocks comprise mainly granodiorite. MMEs are characterized by a microporphiritic texture and revealed some types of microscopic textures, e.g., prismatic-cellular plagioclase with spike zones and rounded plagioclase megacrysts, bladeshaped biotite and acicular apatite. The host rocks show textures such as oscillatory-and reversely zoned plagioclase with spike zone. Compositions of plagioclases (An 41 to An 48 ) of MMEs are similar to those of host rocks (An 38 to An 45 ) which suggest partial to complete equilibration during maficfelsic magma interactions. The individual petrographic and microstructural textures and mineral chemistry similarities between the MMEs and their host rocks and diorites indicate that the enclaves are of mixed origin and most probably formed by interaction of lower crust magma (granitic melt) and evolved mantle-derived magmas (diorites).

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Crust-mantle interaction in continental arcs: inferences from the Mesozoic arc in the southwestern United States

Cited by 26 publications

References 29 publications

Middle Jurassic Topawa Group, Baboquivari Mountains, south-central Arizona: Volcanic and sedimentary record of deep basins within the Jurassic magmatic arc

Middle Jurassic Topawa Group, Baboquivari Mountains, south-central Arizona: Volcanic and sedimentary record of deep basins within the Jurassic magmatic arc

Magmatismo há ca. 660 - 640 Ma no Domínio Socorro: registros de convergência pré-colisional na aglutinação do Gondwana Ocidental

Magma mixing/mingling in Salmas granodiorite, NW Iran: evidence from mafic microgranular enclaves

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