Isotopic Studies in the Roskruge Mountains, Pima County, Arizona

Bikerman, Michael

doi:10.1130/0016-7606(1967)78[1029:isitrm]2.0.co;2

Cited by 12 publications

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“…The overlying Roskruge Rhyolite, possibly as much as 4,000 feet (1,200 m) thick, yielded radiometric dates of about 70 to 72 m.y. (Bikerman, 1967) and was tentatively correlated by Heindl (1965a, p. H14) with the Cat Mountain Rhyolite of Brown (1939) in the Tucson Mountains. The Roadside Formation and the Roskruge Rhyolite together are probably equivalent to the Salero Formation in the Santa Rita Mountains.…”

Section: Areas To Westmentioning

confidence: 96%

Cretaceous paleogeography of southeastern Arizona and adjacent areas

Hayes¹

1970

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The surface geology and topography of the report region at the beginning of Cretaceous time were diverse. During early Early Cretaceous time, the region was shedding sediments southeastward toward a sea in Mexico, and some volcanic activity occurred in a part of southeastern Arizona. By early Aptian time, the sea had advanced northwestward nearly to Arizona, and the region became the locus of coastal-plain sedimentation. By Albian time, the sea had advanced into Arizona and may have made connection with Pacific waters across northern Sonora. Later in Albian time, this connection may have been broken, and prograding deltaic sedimentation pushed the sea southeastward out of Arizona. Near the end of Early Cretaceous time, general tilting of the region caused the seas to retreat from areas south of Arizona and to advance northward across much of New Mexico and westward into Arizona north of lat 32°30' N. Compressional tectonism is late Turonian time made southeastern Arizona a mountainous source area for sediments transported northwestward to the sea. By early Campanian time, broad valleys in this mountainous area were receiving largely fluvial sediments from the surrounding mountains. The region was the scene of widespread volcanism in late Campanian and probably Maestrichtian time. This was followed by plutonism and tectonism of the Laramide orogeny at the end of the Cretaceous and beginning of the Tertiary.This sequence of events is interpreted from the Cretaceous strata preserved in southeastern Arizona and adjacent areas and from the probable relations of these strata to Cretaceous strata of surrounding regions. The oldest Cretaceous rocks in southeastern Arizona are volcanics and associated sedimentary rocks assigned an early Early Cretaceous age. These are succeeded mostly south of lat 32° N. by the Bisbee Group and correlatives of late Early Cretaceous age a thick sequence of rocks that is largely of marine origin toward the east and of continental origin toward the west. Strata of early Late Cretaceous age in Arizona are found only in areas north of about lat 32°30' N. and are represented by the Pinkard Formation and correlatives of near-shore continental and marine origin. Upper Upper Cretaceous sedimentary rocks dominantly of fluvial origin, represented by the Fort Crittenden Formation and correlatives, are only locally present and are in unconfonnable relation with earlier Cretaceous strata. Conformably overlying these strata are the Salero Formation and correlatives made up dominantly of andesitic and rhyolitic volcanics.Most Cretaceous strata in southeastern Arizona are only of modest economic value or potential, but the youngest are commonly altered and locally contain disseminated copper deposits. Limestones of the Bisbee Group are locally quarried, and some of them offer possibilities as reservoir rocks for oil and gas. Bl

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Section: Areas To Westmentioning

confidence: 96%

Cretaceous paleogeography of southeastern Arizona and adjacent areas

Hayes¹

1970

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“…These sources include Beikman and others (1995), Berquist and others (1978), Haxel and others (1978), and Keith and Theodore (1975). Peterson and others (1990) compiled the source map geology from Bikerman (1967), Bromfield (1952), Brown (1939), , Dickenson and Shafiqullah (1989), Keith and others (1980), Peterson (1938), Richard and Courtright (1960), and Shafiqullah and others (1976), among many other sources.…”

Section: Qtamentioning

confidence: 99%

Geologic map of the Tucson and Nogales quadrangles (Arizona, scale 1:250,000): A digital database

Peterson¹,

Berquist²,

Reynolds³

et al. 2001

Open-File Report

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“…In the Tucson Mountains, about 40 miles to the northwest, Brown (1939) and Kinnison (1958) mapped a thick sequence of rocks of late Late Cretaceous age: the Silver Bell Formation (Wood, 1959), which is an andesitic breccia that contains exotic blocks, and the overlying Cat Mountain Rhyolite (Brown, 1939), which is a welded tuff whose plagioclase was isotopically dated as about 65-70 m.y. by Bikerman andDamon (1966, p. 1232). In the Roskruge Range, 15 miles west of the Tucson Mountains, Bikerman (1967Bikerman ( , p. 1032) dated the upper part, of his Roskruge Volcanics, which resemble the Cat Mountain Rhyolite, as 66-72 m.y.…”

Section: Age and Correlationmentioning

confidence: 99%

Mesozoic stratigraphy of the Santa Rita Mountains, southeast of Tucson, Arizona

Drewes¹

1971

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Age and correlation. _____________ _______ Environment of deposition.._____________ 32 6. Modal, chemical, and spectrographic analyses and norms of dacifcic to andesitic rocks of the middle and upper members of the Bathtub Formation _______________________________________________________ 41 7. Chemical and spectrographic analyses and norms of members of the Salero Formation___________________ 72 8. Modal analyses of rhyodacite from the welded-tuff member of the Salero Formation____________________ 72

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Isotopic Studies in the Roskruge Mountains, Pima County, Arizona

Cited by 12 publications

References 0 publications

Cretaceous paleogeography of southeastern Arizona and adjacent areas

Cretaceous paleogeography of southeastern Arizona and adjacent areas

Geologic map of the Tucson and Nogales quadrangles (Arizona, scale 1:250,000): A digital database

Mesozoic stratigraphy of the Santa Rita Mountains, southeast of Tucson, Arizona

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