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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Mexico
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Baja California Mexico (1)
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Durango Mexico (1)
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Guerrero Terrane (1)
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North America
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Mexico
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Baja California Mexico (1)
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Guerrero Terrane (1)
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Sinaloa Mexico (1)
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Sonora Mexico (7)
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mineral deposits, genesis (2)
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El Jaralito Batholith
Geology and chemical composition of the Jaralito and Aconchi batholiths in east-central Sonora, Mexico
The Aconchi-El Jaralito area is 100 km northeast of Hermosillo, and about 200 km southwest of Douglas, Arizona. The intrusive rocks of the region are divided into three units on the basis of their field relations, morphology, mineralogy, chemical composition, and isotopic ages. These units are two granitic batholiths and a group of porphyritic rhyolite stocks. The oldest batholith is the granitic-granodioritic El Jaralito batholith, which has the largest exposure area. Lithologically it varies from a true granite to quartz monzonite, quartz diorite, and granodiorite. The rocks of this batholith are considered I-type or Cordilleran granites. The K/Ar ages reported for EI Jaralito batholith range from 51.8 to 69.6 Ma. The second batholith is the Aconchi batholith, which has a smaller exposure area. It is lithologically simple, consisting almost exclusively of alkali granites, including abundant pegmatites. This is considered an S-type granitoid, with primary muscovite and red garnet. One K/Ar date for this unit is 35.96 ± 0.70 Ma. Chemical analyses show no clear separation between the two batholiths. There is an overlap in the values of some of the oxides. The youngest intrusive rocks in the area are two porphyritic rhyolite stocks, which have quartz, feldspar, and biotite phenocrysts set in a quartz-feldspar matrix. The chemical composition of the stocks is similar to the alkali granites of the Aconchi batholith. Cataclastic deformation was observed within both batholiths in isolated localities; however, the structure of these deformed rocks was not studied in detail. Chemical and isotopic data for these batholiths remain incomplete; it is highly recommended that future chemical data include trace-element concentrations.
Stratigraphy, geochronology, and geochemistry of the Laramide magmatic arc in north-central Sonora, Mexico
Figure 4. Modal quartz–alkali feldspar–plagioclase (QAP) diagram for Laram...
Figure 2. Summary table of geochronologic data of magmatism, mineralization...
Cretaceous and Tertiary sedimentary, magmatic, and tectonic evolution of north-central Sonora (Arizpe and Bacanuchi Quadrangles), northwest Mexico
A chemical and isotopic study of the Laramide granitic belt of northwestern Mexico: Identification of the southern edge of the North American Precambrian basement
Jurassic to Holocene tectonics, magmatism, and metallogeny of northwestern Mexico
Geochemistry of the Coastal Sonora batholith, Northwestern Mexico
ABSTRACT We will embark on a five-day journey through northern, western, and central Sonora, in which we will see excellent examples of mostly Mesozoic to Cenozoic tectonics, sedimentation, and metallogeny. On Day 1, we will visit the porphyry copper deposit at Ajo, Arizona, and several Pleistocene cinder cones and maar craters in the Pinacate Biosphere Reserve. On Day 2, we will see L- and L-S tectonites at the type locality of the Mojave-Sonora megashear in Sierra Los Tanques, Noche Buena orogenic gold deposit, Ediacaran Gamuza beds in Caborca, and have an overview of the Carnero detachment fault on the south side of Sierra La Gloria. Day 3 will explore faults and related sedimentary and volcanic rocks associated with the late Miocene oblique opening of the Gulf of California rift and visit outcrops that record late Miocene timing constraints for flooding of the Gulf of California seaway, including several localities on southern Isla Tiburón accessible only by boat. Day 4 will visit exposures of Permian sedimentary to Paleogene igneous rocks in Hermosillo (Cerro La Campana); Puerto del Sol detachment fault zone; Aconchi batholith and a hot spring localized on a Basin and Range normal fault; Santa Elena low-sulfidation epithermal gold mine; and the Upper Jurassic Cucurpe Formation. On Day 5, we will visit several exposures of different crustal levels of the Magdalena-Madera metamorphic core complex, including the spectacular stretched pebble conglomerates in Arroyo Amolares.