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• W117617491 abstract "Comparison of the Cambrian Southern Oklahoma Aulacogen and the distinctive anorthosite-mangerite-charnockite-granite (AMCG) complexes of the Mid-Proterozoic reveal striking similarities in the temporal and spatial association of igneous rock types in these provinces that suggests a commonality in their petrogenesis. Igneous rocks that comprise the Cambrian Southern Oklahoma Aulacogen include: 1) voluminous anorthositic gabbros, 2) Fe-rich, Ti-rich, and P-rich, biotite-bearing gabbros, 3) A-type leucocratic alkali-feldspar rhyolite and granites (some with rapakivi textures, see Price et al., 1996a), and 4) a suite of “late” diabase dikes. Nearly all of these igneous units have counterparts that occur within AMCG complexes. A noticeable exception in the Southern Oklahoma Aulacogen is the absence of coarse grained massif-type anorthosites, with their characteristic high-Al orthopyroxene megacrysts. This important distinction is interpreted to reflect differences in the conditions of crystallization and emplacement of magmas giving rise to these two provinces. AMCG complexes develop at significantly deeper levels in the crust where assimilation of aluminous continental crust may operate more efficiently due to higher ambient temperatures. In contrast, the epizonal to volcanic conditions of crystallization, and lack of evidence for significant contributions of ancient crust in either mafic or felsic igneous rocks, suggest that parent magmas to the igneous rocks of the Southern Oklahoma Aulacogen were rapidly transported to the emplacement level, where they cooled quickly, thus inhibiting opportunities for large scale crustal assimilation. We further speculate that, if exposed, the large mid-crustal mafic root beneath the Southern Oklahoma Aulacogen, inferred from geophysical and petrologic arguments, would have the appearance of a typical Mid-Proterozoic AMCG complex. Conversely, penecontemporaneous tectono-magmatic provinces, such as the Southern Oklahoma Aulacogen, may have overlain Mid-Proterozoic AMCG complexes and have been subsequently removed by erosion." @default.
• W117617491 created "2016-06-24" @default.
• W117617491 creator A5077305351 @default.
• W117617491 creator A5079127842 @default.
• W117617491 date "1998-01-01" @default.
• W117617491 modified "2023-10-13" @default.
• W117617491 title "The Southern Oklahoma Aulacogen: A Cambrian analog for Mid-Proterozoic AMCG (Anorthosite-Mangerite-Charnockite-Granite) complexes?" @default.
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• W117617491 doi "https://doi.org/10.1007/978-94-011-5098-9_3" @default.
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