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19. The Trans-Crustal Evolution of Miocene Magmatism Parental to Epithermal Mineralization in the Sierra Madre del Sur, Southern Mexico.

Author

Cano, Néstor, Martiny, Barbara M, Camprubí, Antoni, González-Partida, Eduardo, Schaaf, Peter, Ortega-Obregón, Carlos, and Solís-Pichardo, Gabriela

Subjects
ANDESITE, FELSIC rocks, METALLOGENY, MAGMATISM, MIOCENE Epoch, PLAGIOCLASE
Abstract

Arc-related volcanism results from the interplay of magmatic processes occurring in trans-crustal systems that consolidate over time in a given location. Trans-crustal systems comprise extensive networks of magma reservoirs and conduits at different depths, wherein melts cyclically differentiate and segregate before reaching the surface. The study of these systems provides valuable insights into crustal-scale phenomena, such as the evolution of the continental crust and the formation of metallogenic regions. In this study, we address the trans-crustal magmatic evolution of lower Miocene magmatism parental to several intermediate-sulfidation epithermal deposits in the eastern Sierra Madre del Sur igneous province, southern Mexico. Using a multi-methodological approach, we document changes over ca. 1.1 Myr in the magmatic system that fed andesitic-to-felsic volcanism in this region. We employ whole-rock REE ratios and λ parameters—which are used to quantify the shape of a REE pattern—to track the involvement of pressure-sensitive minerals in the deep-crustal magmatic evolution. The andesitic rocks consist of lava flows, porphyries, and dikes that collectively show REE patterns suggestive of control by fractionated or residual (i.e. in crustal melting) amphibole and/or clinopyroxene. In contrast, the felsic rocks consist of rhyolitic–dacitic ignimbrites, domes, and dikes that show contrasting REE patterns suggestive of control by plagioclase, clinopyroxene, amphibole, and/or garnet. The distinct pressure-sensitive mineral assemblages in the andesitic and felsic rocks indicate that the locus of deep-crustal magma evolution varied within the middle–lower crust. These magmas were episodically injected into ephemeral shallow crustal reservoirs (shortly?) before being erupted, inducing a progressive thermomechanical maturation of the middle–upper crust. Meanwhile, low degrees of crustal assimilation occurred as recorded by Mesozoic inherited zircon ages and Sr–Nd–Pb radiogenic isotopes. An extensive middle–lower crustal magma evolution has been linked to the formation of porphyry Cu deposits (i.e. 'fertile' magmatism). Given that intermediate-sulfidation epithermal deposits may be genetically linked with porphyry Cu deposits, the documented processes could have contributed to the formation of epithermal deposits in the region. However, magmatic fertility proxies resemble those from infertile magmas worldwide. Since these proxies have been exclusively applied to porphyry-type deposits, our results highlight the importance of developing new geochemical exploration tools applicable to a wider range of ore deposits. [ABSTRACT FROM AUTHOR]

Published
2024
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27. El depósito de oro supracretácico La Felipeña en el extremo oriental del batolito de las Sierras Peninsulares (Baja California, México): Estudio preliminar.

Author

Lazcano, Javier, Camprubí, Antoni, González-Partida, Eduardo, Iriondo, Alexander, and Miggins, Daniel P.

Subjects
MUSCOVITE, OROGENIC belts, GEOLOGICAL time scales, VEINS (Geology), METALLOGENY, BATHOLITHS, RADIOACTIVE dating, FLUID inclusions
Abstract

Copyright of Boletín de la Sociedad Geológica Mexicana is the property of Sociedad Geologica Mexicana and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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30. Tiempos de acumulación de carbón en México con especial énfasis en la Cuenca de Sabinas México, donde se proporcionan nuevos datos geocronológicos

Author

González-Partida, Eduardo, primary, González-Betancourt, Aurea Yahaira, primary, Camprubí, Antoni, primary, Carrillo-Chávez, Alejandro, primary, Iriondo, Alexander, primary, Enciso-Cárdenas, Juan Josué, primary, González Carrillo, Fabiola, primary, and Vázquez Ramírez, Juan Tomás, primary

Published
2022
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41. Metallogeny of the state of Oaxaca, Mexico.

Author

Cano, Néstor, Camprubí, Antoni, and González-Partida, Eduardo

Subjects
METALLOGENY, MINING districts, ORE deposits, DATABASES, PROTEROZOIC Era
Abstract

The state of Oaxaca in southern Mexico includes copious metallic deposits of distinct types that were formed in several tectonothermal events since the Proterozoic. This work integrates a large database of mineral occurrences and deposits in Oaxaca. The 1:850,000 scale metallogenetic map depicts the location of deposits, mining regions, and mining districts on a lithological base, along with a summarized metallogenic history of the state and the distribution of the tectonostratigraphic terranes. We briefly describe the most relevant features of each mineralized area and the characteristics of the metallogenic epochs of Oaxaca. All the geolocation information was organized in GIS format. [ABSTRACT FROM AUTHOR]

Published
2023
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42. Distribution of hypogene alteration and fluid evolution in the Los Humeros Geothermal Field (Puebla, Mexico): Multiple sourced fluids, interrelations, and processes in a superhot system

Author

González-Partida, Eduardo, primary, Camprubí, Antoni, additional, López-Hernández, Aída, additional, Santoyo, Edgar, additional, Izquierdo-Montalvo, Georgina, additional, Pandarinath, Kailasa, additional, Yáñez-Dávila, David, additional, González-Ruiz, Luis E., additional, González-Ruiz, Daniel, additional, Díaz-Carreño, Erik, additional, and Juárez-Hilarios, Elidee, additional

Published
2022
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