Metamorphic and stratigraphic constraints on the evolution of the Santa Catalina Mountains metamorphic core complex, Arizona

Journal Article · Wed Jan 10 04:00:00 EST 1990 · Journal of Geophysical Research; (United States)

DOI:https://doi.org/10.1029/JB095iB01p00501· OSTI ID:5073962

Palais, D G; Peacock, S M ^[1]

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1. Arizona State Univ., Tempe (United States)

Contact metamorphic mineral assemblages in the Santa Catalina Mountains metamorphic core complex constrain the emplacement depth of the metaluminous Late Cretaceous Leatherwood quartz diorite to between 7.5 and 14 km (2-3.8 kbar). The peraluminous Eocene Wilderness granite is constrained to have been emplaced at depths of less than 14 km. Stratigraphic and tectonic considerations are consistent with emplacement of both the Leatherwood quartz diorite and Wilderness granite at upper crustal levels. Published igneous thermobarometry (Anderson et al., 1988), although in approximate agreement with the metamorphic and tectonostratigraphic estimates for the depth of emplacement of the Wilderness granite, suggests that the Leatherwood quartz diorite was emplaced at depths of {approximately} 21 km (5.6 kbar) or greater. The discrepancy between the different emplacement estimates may reflect ambiguities associated with interpretations of the results from each technique. Igneous barometric assemblages may reflect conditions experienced during a period of crystallization during ascent of the magma through the crust (i.e., ponding of the magma). Alternatively, emplacement of the voluminous Wilderness granite and associated plutons may have entirely overprinted earlier Leatherwood-related contact metamorphism. The proposed upper crustal emplacement of the Leatherwood quartz diorite is consistent with the observation that Laramide-age crustal thickening in southeast Arizona probably did not exceed 8 km.

• OSTI ID: 5073962
• Journal Information: Journal of Geophysical Research; (United States), Journal Name: Journal of Geophysical Research; (United States) Vol. 95:B1; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

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58 GEOSCIENCES
580000* -- Geosciences
ARIZONA
CONSTRAINTS
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CRYSTALLIZATION
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DIMENSIONS
EARTH CRUST
FEDERAL REGION IX
GEOLOGIC AGES
GEOLOGIC HISTORY
GEOLOGIC MODELS
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GRANITES
IGNEOUS ROCKS
MAGMA
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METAMORPHIC ROCKS
METAMORPHISM
MINERALOGY
MINERALS
MOUNTAINS
NORTH AMERICA
OROGENESIS
OXIDE MINERALS
PHASE TRANSFORMATIONS
PLUTONIC ROCKS
QUARTZ
ROCKS
STRATIGRAPHY
TECTONICS
THICKNESS
USA