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metals
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Mexico
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United States
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sediments
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GeoRef Categories
Era and Period
Epoch and Age
Date
Availability
U–Pb zircon geochronology and geochemistry of the Jurassic magmatic rocks from the region of Cananea and Nacozari, northeastern Sonora, Mexico: timing and composition of the southernmost edge of the Jurassic continental arc Available to Purchase
The Permian Monos Formation: Stratigraphic and detrital zircon evidence for Permian Cordilleran arc development along the southwestern margin of Laurentia (northwestern Sonora, Mexico) Open Access
Detrital zircon U-Pb geochronology of the Sierra de Santa Rosa Formation, Sonora, Mexico, and implications for an Early Jurassic retroarc basin Open Access
Provenance of Upper Triassic strata in southwestern North America as suggested by isotopic analysis and chemistry of zircon crystals Available to Purchase
The source of volcanic material in the Upper Triassic Chinle Formation on the Colorado Plateau has long been speculated upon, largely owing to the absence of similar-age volcanic or plutonic material cropping out closer than several hundred kilometers distant. These strata, however, together with Upper Triassic formations within El Antimonio and Barranca Group sedimentary rocks in northern Sonora, Mexico, yield important clues about the inception of Cordilleran magmatism in Triassic time. Volcanic clasts in the Sonsela Member of the Chinle Formation range in age from ca. 235 to ca. 218 Ma. Geochemistry of the volcanic clasts documents a hydrothermally altered source region for these clasts. Detrital zircons in the Sonsela Member sandstone are of similar age to the clasts, as are detrital zircons from the El Antimonio and Barranca Groups in Sonora. Most noteworthy about the Colorado Plateau Triassic zircons, however, are their Th/U ratios, which range from ~1 to 3.5 in both clast and detrital zircons. Thorium/uranium ratios in the Sonoran zircons, in contrast, range from ~0.4 to ~1. These data, together with rare-earth-element geochemistry of the zircons, shed light on likely provenance. Geochemical comparisons support correlation of clasts in the Sonsela Member with Triassic plutons in the Mojave Desert in California that are of the same age. Zircons from these Triassic plutons have relatively low Th/U ratios, which correspond well with values from El Antimonio and Barranca Group sedimentary rocks, and support derivation of the strata, at least in part, from northern sources. The Sonsela Member zircons, in contrast, match Th/U values obtained from Proterozoic through Miocene volcanic, volcaniclastic, and plutonic rocks in the eastern and central Mojave Desert. Similarly, rare-earth-element compositions of zircons from Jurassic ignimbrites in the Mojave Desert, though overlapping those of zircons from Mojave Desert plutons, also closely resemble those from Sonsela Member zircons. We use these data to speculate that erosion of Triassic volcanic fields in the central to eastern Mojave Desert shed detritus that became incorporated into the Chinle Formation on the Colorado Plateau.
Lower Cretaceous strata of the Sonora Bisbee Basin: A record of the tectonomagmatic evolution of northwestern Mexico Available to Purchase
Stratigraphy, geochronology, and geochemistry of the Laramide magmatic arc in north-central Sonora, Mexico Open Access
Testing the Mojave-Sonora megashear hypothesis: Evidence from Paleoproterozoic igneous rocks and deformed Mesozoic strata in Sonora, Mexico Available to Purchase
The Antimonio Formation in Sonora, Mexico, and the Triassic – Jurassic boundary Free
Paleogeographic and tectonic implications of Triassic fossils and strata from the Antimonio Formation, northwestern Sonora Available to Purchase
Full article available in PDF version.
Ichthyosaurs from the Upper Triassic of Sonora and the biochronology of Triassic ichthyosaurs Available to Purchase
Full article available in PDF version.
Stratigraphy and structure of the lower part of the Bisbee Group, northeastern Chiricahua Mountains, Arizona Available to Purchase
Full article available in PDF version.
Stratigraphy and paleontology of the Early Cretaceous Cerro de Oro Formation, central Sonora Available to Purchase
Biostratigraphy of the Lower Cretaceous Bisbee Group, Rancho Culantrillo area, northeastern Sonora Available to Purchase
Full article available in PDF version.
Jurassic-Cretaceous paleogeography of the Magdalena region, northern Sonora, and its influence on the positioning of Tertiary metamorphic core complexes Available to Purchase
Full article available in PDF version.
Paleogeography and provenance of the Lower Cretaceous Bisbee Group in the Caborca-Santa Ana area, northwestern Sonora Available to Purchase
Full article available in PDF version.
Southwestern extension of the Papago Terrane into the Altar Desert region, northwestern Sonora, and its implications Available to Purchase
Full article available in PDF version.
Cenomanian thrust tectonics in the Sahuaria region, Sonora: Implications about northwestern Mexico megashears Available to Purchase
Full article available in PDF version.
Stratigraphy, depositional environments, and origin of the Cabullona Basin, northeastern Sonora Available to Purchase
Full article available in PDF version.