Características geológicas y potencial metalogenético de los principales complejos ultramáficos-máficos de México

Ortiz-Hernández, Luis Enrique; Escamilla-Casas, José Cruz; Flores-Castro, Kinardo; Ramírez-Cardona, Màrius; Acevedo-Sandoval, Otilio A.

doi:10.18268/bsgm2006v58n1a6

Cited by 16 publications

(23 citation statements)

References 24 publications

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“…The regional rocks in the Copper King area belong to an ultramafic-mafic complex that has been described to have formed in an intraoceanic arc (Ortiz-Hernández et al, 2006) dated at 112 Ma (Talavera-Mendoza, 2001) and was emplaced onto the continent, probably as part of the Arteaga accretionary prism. The basic submarine volcanism in the above regions has alkaline affinity whereas intermediate to acid volcanism (andesites, dacites, rhyolites) is essentially calc-alkaline (González-Partida, 1993;Tardy et al, 1994).…”

Section: Deposits In the Zihuatanejo And Alisitos Terranesmentioning

confidence: 99%

Mesozoic volcanogenic massive sulfide (VMS) deposits in Mexico

Camprubí

Gonzáléz-Partida

Torró

et al. 2017

Ore Geology Reviews

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Volcanogenic massive sulfide (VMS) deposits are the most conspicuous type of deposits that formed during the Mesozoic inMexico.ManyMexicanVMS deposits display "classical" Kuroko-typemineral zonation and structure, and some of them, as Cuale and La Minita formed in shallowsubmarine environments. Themost prospective time window for the formation of VMS deposits in Mexico comprises the Late Jurassic and the Early Cretaceous. VMS stopped forming during the progressive continentalization of Mexico, since its metallotectonic processes (dominated by extensive tectonics) changed givingway to compression during the late Early Cretaceous; newVMS deposits did not form until after the opening of the Gulf of California.MesozoicVMS deposits inMexico occur in submarine volcano-sedimentary sequences that deposited essentially in association with back-arc basins (now found roughly along the boundaries between tectonostratigraphic terranes) or within juvenile and slightly evolved arcs (at the internal parts of the terranes), while few others occur on the epicontinental seafloor and hinterlands of eastern Mexico. VMS deposits are especially abundant in the Guerrero composite terrane, and are also present in the Alisitos and Parral terranes.However, new evidence referred in this paper indicate the western continental edge of the cratonic block of Oaxaquia as a promising, new prospective region for VMS deposits.Interestingly, no VMS deposits are found in the northern part of the Guerrero composite terrane despite the occurrence of marine volcano-sedimentary sequences similar to those in the south; such absence can be related to differential extensional unroofing, much larger in the southern part of the Guerrero composite terrane than in the northern part.Many VMS deposits occur along or close to terrane boundaries, especially around the Guerrero composite terrane. This distribution reflects the association between VMS deposits and back-arc basins, which represented the frontal part of terranes or sub-terranes that were ultimately accreted to the Oaxaquia cratonic block. As a consequence, VMS deposits usually display strong deformation and thrusting, and their mineral and compositional zonation can be found overturned. Due to such common association between these deposits and terrane boundaries that reactivated during the Cenozoic, VMS deposits are especially susceptible to overprinting by later metallogenic processes, unrelated to VMS-producing

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Section: Deposits In the Zihuatanejo And Alisitos Terranesmentioning

confidence: 99%

Mesozoic volcanogenic massive sulfide (VMS) deposits in Mexico

Camprubí

Gonzáléz-Partida

Torró

et al. 2017

Ore Geology Reviews

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“…1). It is one of the several mafic-ultramafic complexes of ophiolitic affinity that contain chromitite deposits along the boundaries of the GCT on the Pacific coast of Mexico (Ortiz-Hernández et al 2006;Camprubí 2013). The Loma Baya ultramafic complex represents a portion of obducted subarc upper mantle, which probably formed in an intraoceanic island arc developed during Late Jurassic to Early Cretaceous time along the palaeo-Pacific coast of Mexico (Mendoza 2000;Mendoza and Suastegui 2000;OrtizHernández et al 2006).…”

Section: Geological Backgroundmentioning

confidence: 99%

Thermal metamorphism of mantle chromites and the stability of noble-metal nanoparticles

Gonzáléz-Jiménez

Reich

Camprubí

et al. 2015

Contrib Mineral Petrol

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event, confirming previous thermodynamic predictions. Understanding these complex features is of particular interest due to the fact that changes in temperature and variable degrees of fluid/rock interaction during metamorphism and intrusion have also significantly affected the chromitehosted IPGE carrier phases. Here, we propose that the metamorphic fluids involved in the hydrous metamorphism have caused the desulphurization of laurite RuS 2 , releasing minute particles of Ru-Os-Ir alloys <50 nm in diameter. The following short-lived thermal event that promoted dehydration in the chromitite had the opposite effect on nanoparticle stability, producing a significant coarsening of metal nanoparticles to dimensions larger than a micron. Based on such observations, we argue that IPGE nanoparticles can be exsolved and grown (or coarsen) from sulphide matrices during prograde metamorphism or heating and not exclusively upon cooling under magmatic conditions as it has been previously suggested. These results provide new insights on the relevant role of temperature and nanoparticle-host interaction phenomena in natural systems, shedding new light on the kinetic controls of nano-to micronscale IPGE particle distributions during metamorphism. Abstract The Loma Baya complex in south-westernMexico is a volume of chromitite-bearing oceanic mantle that records a complex metamorphic history, defined by a first stage of hydrous metamorphism overprinted by a short-lived thermal event associated with an Eocene granite intrusion. During the hydrous metamorphism, the primary magmatic chromite-olivine assemblage was replaced by a secondary, porous intergrowth of Fe 2+ -rich chromite and chlorite. The heat supplied by an Eocene-age granite intrusion reversed the hydration reaction, producing chromite rims with perfectly developed crystal faces. This thirdgeneration chromite is in equilibrium with highly magnesian (neoformed) olivine and defines a chemical trend analogous to the original magmatic one. The preservation of both reactions in the Loma Baya chromitite provides compelling evidence that the hydration of chromite can be reversed by either prograde metamorphism or any heating Communicated by Othmar Müntener. Electronic supplementary materialThe online version of this article (

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“…The mountainous relief, which stretches from Jalisco in the Northwest, to Oaxaca in the Southeast (Fig. 1), is shaped by an accreted, imbricated geological basement consolidated between a fragment of the "Oaxaquia" proterozoic paleocraton (Ortega-Gutiérrez et al, 1995;Centeno-García, 2005), known as the "Zapoteco" terrain (metamorphic sequences), and other tectonostratigraphic phanerozoic terrains: a) "Mixteco" (Paleozoic metasedimentaries and magmatics); b) "Mazateco" (Mesozoic metasedimentaries, metamorphosed volcanosedimentaries, granitoids and serpentines); c) "Chatino" (quartzfeldspathic ortogneisses and metasedimentary rocks (Sedlock et al, 1993); and d) "Nahuatl" (serpentines, diorites, gabbros, lutites and sandstones from the lower to upper Cretaceous (Ortiz-Hernández et al, 2006).…”

Section: Regional Settingmentioning

confidence: 99%