Preliminary reconnaissance geologic map of the Bellota Ranch quadrangle, Pima County, Arizona

Creasey, S. C.; Theodore, Ted G.

doi:10.3133/ofr75295

Cited by 8 publications

(22 citation statements)

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“…for zircon from such xenoliths in the Santa Catalina Mountains confirms the above field observations (Creasey and Theodore, 1975;Banks, 1976;Creasey and others, 1977;Banks, 1977) that the dark schistose rock and biotite augen gneiss intruded by and included in the gneiss of Windy Point are in large part the Precambrian Y Oracle Granite of Peterson (1938) (hereafter simply referred to as Oracle Granite). Gneiss of still older Precambrian Y granitic rocks, the Continental, Johnny Lyon, and Rincon Valley Granodiorites, occur in and around the Rincon Mountains (Drewes, 1974(Drewes, , 1977 and are part of the protoliths of the schistose and dark gneissic rocks in that part of the complex.…”

Section: Rotesupporting

confidence: 70%

“…6, 8, cross sections B-B', C-C) by several sheets of folded Precambrian through Tertiary sedimentary rocks (see Creasey and Theodore, 1975;Drewes, 1974Drewes, , 1977Davis, , 1977bThorman, 1977). Detailed structural studies suggest that the folds in the sheets around the Rincon Mountains developed by gravity gliding off the gneiss in Miocene time (McColly, 1961;Arnold, 1971;Davis, , 1977bDavis and Frost, 1976).…”

Section: Santa Catalina-rincon Mountainsmentioning

confidence: 99%

“…6). The complex has been the subject of a considerable amount of recent study (Drewes, 1974(Drewes, , 1976(Drewes, , 1977Creasey and Theodore, 1975;Davis and Frost, 1976;Banks, 1976Banks, , 1977Creasey and others, 1977;Shakel and others, 1977), many theses (principally at the University of Arizona), and a number of less recent studies (Moore and others, 1949;Bromfield, 1952;Dubois, 1959aDubois, , 1959bDamon and Giletti, 1961;Damon and others, 1963;Mayo, 1964;Catanzaro and Kulp, 1964;Livingston and others, 1967;Mauger and others, 1968;Shakel, 1972;Shakel and others, 1972; and several more local studies). Despite this effort, the number and ages of intrusions present and the number and ages of deformations involved are still undecided, probably in part due to divergence of opinion about the identity of some of the rock types, inconclusive results of the radiometric studies, and lack of complex-wide, detailed mapping and petrology.…”

Section: Santa Catalina-rincon Mountainsmentioning

confidence: 99%

“…7), occurs mostly as sill-like bodies along the northern margin of the complex (Figs. 6, 8), cuts Mesozoic deposits (Bromfield, 1952; Theodore, 1975), is locally foliated, and is intruded by both the gneiss of Windy Point and undeformed Tertiary intrusive rock (Moore and others, 1949;Peirce, 1958;Dubois, 1959aDubois, , 1959bCreasey and Theodore, 1975;Banks, 1976Banks, , 1977Creasey and others, 1977). The actual age of the quartz diorite has not been established; the published ages are Tertiary and essentially concordant with those of the intruding rocks (Table 3).…”

Section: Santa Catalina-rincon Mountainsmentioning

confidence: 99%

“…In the Santa Catalina-Rincon Mountains complex (Fig. 1), the Leatherwood Quartz Diorite of Bromfield (1952), which intrudes Mesozoic sedimentary rock (Creasey and Theodore, 1975) was involved in the metamorphism (Moore and others, 1949;Bromfield, 1952;Peirce, 1958;Dubois, 1959a;Creasey and others, 1977;Banks, 1976). In the Tortolita Mountains ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Geology of a zone of metamorphic core complexes in southeastern Arizona

Banks

1980

Geological Society of America Memoirs

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An elongate northwest-trending zone of batholith-size metamorphic core complexes extends some 130 km from the Rincon Mountains to the Picacho Mountains in southeastern Arizona. The complexes are characterized by undeformed to gneissic granitic intrusions, gneissic to phyllonitic xenoliths and wall rocks derived mainly from Precambrian granitic rock, shallow-dipping foliation, and remarkably uniform directions of lineation. Parts of this zone have been recognized and studied extensively for more than 30 yr, but there remains a divergence of opinion about the age, depth of emplacement, and origin of the complexes. Field relations indicate that host rocks as young as or younger than Mesozoic were involved in cataclasis. K-Ar and fission-track ages indicate that the complexes were at temperatures uniformly in excess of400 °C in the middle Tertiary (20 to 30 m.y. ago) and that the bedrock between and very near the complexes was not thermally affected. Tertiary plutons characteristically associated with the high-grade metamorphic rocks are also cataclastically deformed, and stratigraphic depths to the top of metamorphic terranes were no more than 6 km and possibly less than 3 km. These and other data suggest to some that the complexes developed during intrusion of composite batholiths at shallow depth in an anisotropic stress field during the middle Tertiary. On the other hand, Rb-Sr and U-Th-Pb techniques yielded older ages (>44 m.y.) for some samples. These and additional data suggest to others that major development of cataclasis preceded the middle Tertiary and included regional thrusting.

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Section: Rotesupporting

confidence: 70%

Section: Santa Catalina-rincon Mountainsmentioning

confidence: 99%

Section: Santa Catalina-rincon Mountainsmentioning

confidence: 99%

Section: Santa Catalina-rincon Mountainsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geology of a zone of metamorphic core complexes in southeastern Arizona

Banks

1980

Geological Society of America Memoirs

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Metamorphic and stratigraphic constraints on the evolution of the Santa Catalina Mountains Metamorphic Core Complex, Arizona

Palais¹,

Peacock²

1990

J. Geophys. Res.

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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 diortite was emplaced at depths of ∼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 Lararrade‐age crustal thickening in southeast Arizona probably did not exceed 8 km.

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Kinematics of Pre‐Miocene ductile deformation in the Santa Catalina Core Complex and adjacent regions

Guerin¹,

Brun²,

Driessche³

1990

Tectonics

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This paper describes structures within mylonites and metamorphic rocks from the Santa Catalina and Tortolita‐Suizo metamorphic core complexes, southeastern Arizona, United States. In these areas, mylonitic rocks constitute an easterly low‐dipping slab more than 4 km thick. Mapping of principal strain directions and analysis of shear sense have been carried out through the whole pile of mylonites. It is shown that although the stretching lineation appears to have a uniform mean SW‐NE trend, three successive shearing events are involved. The first shearing event is toward the west and is accompanied in part by the emplacement of the Leatherwood Quartz Diorite dated at 64 Ma. The second shearing event is toward the NE and is accompanied by the emplacement of the Wilderness Granitic Suite dated at 49 Ma. The third shearing event is localized and directed toward the SW. The top‐to‐west shearing and top‐to‐NE shearing are possibly related to Laramide thrusting. The last ductile shearing is related to post‐Eocene extension.

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Preliminary reconnaissance geologic map of the Bellota Ranch quadrangle, Pima County, Arizona

Cited by 8 publications

References 0 publications

Geology of a zone of metamorphic core complexes in southeastern Arizona

Geology of a zone of metamorphic core complexes in southeastern Arizona

Metamorphic and stratigraphic constraints on the evolution of the Santa Catalina Mountains Metamorphic Core Complex, Arizona

Kinematics of Pre‐Miocene ductile deformation in the Santa Catalina Core Complex and adjacent regions

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