Eduardo González-Partida

Universidad Nacional Autónoma de México | UNAM

El carbón se define como una roca sedimentaria de origen orgánico formada por el depósito de restos vegetales y sedimentos arcillosos, que han sido sometidos a un proceso diagenético. Los principales factores que controlan la formación del carbón durante la diagénesis son: 1) la acumulación de materia orgánica y sedimentos, 2) subsidencia, 3) tiran...

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...

The studies on hydrothermal alteration-induced effects in surface and subsurface rocks provide useful information in the characterization and exploitation of a geothermal reservoir. Generally, these studies are based on traditional, and reliable methods like petrography (primary and secondary minerals, and grade of alteration), and geochemistry (mo...

The final magmatic arc—Miocene in age—of the long-lived Sierra Madre del Sur igneous province in southern Mexico hosts several epithermal deposits that have hitherto received little attention. The Natividad Au-Ag(-Ge) epithermal deposit is one of them and holds a mining record of > 200 years. Here, we present the first petrogenetic and metallogenic...

The Northeast of Mexico is known for the exploitation of hydrocarbons, moreover, the region also contains thermal manifestations that have not been studied in detail to determine their characteristics and to evaluate their possible use in the generation of electricity, and/or in direct uses. This work presents a preliminary geothermal prospecting s...

The Acoculco geothermal system records two major hydrothermal events (prograde skarn overlapped by retro-grade/"epithermal" to geothermal stages) in association with pre-calderic to calderic events in the eponymous complex, which belongs to the Trans-Mexican Volcanic Belt. The prograde skarn is associated with a hornblende granite (hereby dated at...

El prospecto La Felipeña y otras manifestaciones minerales localizadas en el área periurbana de San Felipe (Baja California) consisten en vetas de cuarzo-carbonato con escasos sulfuros, mica blanca y turmalina, que muestran contenidos anómalos de Au. Las vetas se emplazaron en rocas metasedimentarias paleozoicas en facies de esquistos verdes y en d...

The Santa María and Antares Zn-Pb(-Ag) skarn deposits in the Velardeña Mining District are located in central-NW Mexico. They lie 470 m apart along the contact between Oligocene felsic intrusions and Cretaceous limestones, and were developed during prograde, retrograde, post-ore (Santa María), and late stages. Firstly, the prograde stage was formed...

Epithermal bonanza-type ores, characterized by weight-percent contents of e.g., gold and silver in a few mm to cm, are generated by mixtures of magmatic-derived hydrothermal brines and external fluids (e.g., meteoric) that transport a variety of metals to the site of deposition. However, the low solubilities of precious metals in hydrothermal fluid...

Utility of the geothermal surface manifestations (GSMs; thermal springs, geysers, fumaroles, and zones of hydrothermal alteration) in the studies related to the geothermal exploration is widely recognized. The identification of hydrothermally altered rocks and zones of alteration is very important because their presence indicates the type and size...

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...

The Miocene skarn deposits at Tatatila–Las Minas are found in central-eastern Veracruz state, east Mexico, near the Palma Sola massif. These deposits are geologically associated with the early stages of the Trans-Mexican Volcanic Belt (TMVB) intruded Mesozoic carbonate rocks of the Sierra Madre Oriental. Skarn associations are distributed in the cl...

En México, se han identificado en el tiempo y espacio diferentes épocas de acumulación de materia orgánica, que han dado origen a distintas cuencas carboníferas como en el Triásico la Cuenca de Barrancas en la Región Carbonífera de San Marcial en Sonora; en el Jurásico Medio y Tardío la Cuenca de Tlaxiaco en Oaxaca; y en el Cretácico superior las c...

En este trabajo se pretende observar los cambios en los patrones de sedimentación y fauna de las Formaciones Eagle Ford e Indidura que afloran en el estado de Coahuila. Estas sucesiones sedimentarias se depositaron dentro del rango Cenomaniano-Turoniano en el interior de la cuenca de Sabinas y se componen de facies arcillosas, carbonatadas, bioclás...

The state of Oaxaca is one of the most geologically complex and diverse in Mexico. It comprises five tectonostratigraphic terranes of contrasting nature that form a sort of tectonic collage where several magmatic pulses were developed. The different lithological assemblages of Oaxaca favored the generation of a variety of ore deposit types, some of...

In this work, the goal is to understand the diagenetic history of a Tithonian-Berriasian hydrocarbon generating rock (Pimienta Formation), belonging to the Tampico-Misantla Basin. This sedimentary formation is differentiated into two facies, the former consists of clay-carbonate deposits and flint, and the latter consists of calcareous deposits and...

The El Álamo is one of the most important historic gold mining districts in the Peninsular Ranges batholith. Gold mineralizations at El Álamo consist in fault-fill laminated quartz veins with small amounts of sulfides and oxides, and lesser amounts of gold. Veins are mainly emplaced along compressional brittle-plastic shear zones within the El Álam...

The Los Humeros Geothermal Field (LHGF) is one of the highest producing geothermal areas in Mexico. This paper aims essentially to determine high-resolution patterns of distribution of hypogene alteration assemblages and the distribution of temperatures in space and time of geothermal fluids in the LHGF. The zoning of hypogene alteration assemblage...

Large outcrops of jasperoids occur in the ‘Montaña de Manganeso’ mining district in north-central Mexico. They range from massive manganiferous jasperoids to highly brecciated, hematitic jasperoid. The jasperoids of ‘Montaña de Manganeso’ occur mainly as replacements of limestone, sandstone and shale, commonly nearby high-angle fault systems. The m...

The Montaña de Manganeso is a manganese vein-type deposit spatially associated with back-arc basin remnants of the Guerrero tectonostratigraphic terrane. The study of major- and trace-element geochemical characteristics of the deposit provides insight into the controls on ore-forming processes within the area. The deposit is characterized by low Co...

Petrophysical and mechanical rock properties are key parameters for the characterization of the deep subsurface in different disciplines such as geothermal heat extraction, petroleum reservoir engineering or mining. They are commonly used for the interpretation of geophysical data and the parameterization of numerical models and thus are the basis...

The Cu- and Au-rich Tatatila–Las Minas IOCG skarn deposits in Veracruz (central-east Mexico) are circumscribed to the earliest stages of the Trans-Mexican Volcanic Belt (TMVB) and stand for a metallogenic province directly linked to its tectonomagmatic dynamics. This is the first well-documented case for such metallogenic province. These deposits w...

The Ixtacamaxtitlán area in northern Puebla (central Mexico) contains middle Miocene Cu-Mo-Au porphyry/ skarn and Pliocene low-sulfidation Au-Ag epithermal deposits that are geologically associated with the evolution of the Trans-Mexican Volcanic Belt (TMVB). In this paper, a new 40Ar/39Ar age (2.87 ± 0.41 Ma) is provided for rhombohedral alunite f...

The Xoconostle prospect in northeastern Michoacán state, south-central Mexico, is constituted by high sulfidation epithermal breccias and stockworks with Au and Hg prospective anomalies. The mineralization is hosted by latest Miocene to Pliocene rocks grouped into the El Terrero ignimbrite and the Siete Cruces dome complex and a stock of intermedia...

Petrophysical and mechanical rock properties are key parameters for the characterization of the deep subsurface in different disciplines such as geothermal heat extraction, petroleum reservoir engineering or mining. They are commonly used for the interpretation of geophysical data and the parameterization of numerical models and thus are the basis...

The Molango deposits of eastern central Mexico are the largest Mn deposits in Northamerica. These deposits are hosted by late Jurassic (Kimmeridgian) black shales belonging to the Chipoco formation. Mineralogical, sedimentological, geochemical and isotopic methods were employed to investigate the genesis of the deposit. Mineralogical and geochemica...

The Velardeña mining district is economically the most important of Durango state. The ore deposits occur in different skarn zones developed within the intrusive contact between Mesozoic limestones and Eocene granitic stocks and dikes. The most important ore deposits are related to the Santa María dike and Reyna de Cobre porphyritic stock (separate...

Manganese mineralization at Montaña de Manganeso, San Luis Potosí state, consists of oxide ores that form sharp contacts with volcanic host rocks. The orebodies are generally in the form of veins and irregular masses, and locally as mineralized breccias. Petrographic analyses indicate that the mineralization is multi-episodic, with colloform and cr...

Most of the volcanic rocks in the Acoculco geothermal system (AGS), near to the surface manifestations, are intensively altered. Thirty‐four surface volcanic rocks and five rocks from outcrop sections are considered in this work. Silica polymorphs (quartz, cristobalite and tridymite) are the dominant hydrothermal minerals in almost all the rock sam...

The Velardeña mining district is economically the most important of Durango state. The ore deposits occur in different skarn zones developed within the intrusive contact between Mesozoic limestones and Eocene granitic stocks and dikes. The most important ore deposits are related to the Santa María dike and Reyna de Cobre porphyritic stock (separate...

There are several organic matter-rich shale geologic formations in Mexico that could be considered non-conventional potential oil reservoirs; one of those formations is the Eagle Ford Formation (Late Cenomanian - Turonian), aim of this study. The Eagle Ford Formation is located within the Sabinas paleobasin and along the Burros-Peyote paleoplatform...

Hot springs with associated Mn-Ag mineralization were identified in the intertidal zone of the Bahia Concepcion Bay of the central-eastern Baja California Peninsula. Hot spring activity is related to a system of NW-SE faults that are associated with the opening of the Gulf of California. The hot springs are hosted by Miocene volcanic and volcanicla...

Geochemical mass balances, supported by mineral characterization and whole-rock elemental analyses, were used to decipher the alteration paragenesis and to understand the elemental mobility related to the interaction of hydrothermal fluids with volcanic rocks (ignimbrites and lavas ranging from rhyolite to dacite) from the Acoculco geothermal syste...

La zona geotérmica de San Bartolomé de los Baños, al SE del estado de Guanajuato (México), contiene alrededor de 150 manifestaciones termales, con temperaturas de descarga de hasta 92 °C y pH de 6.0‒9.2. Los manantiales termales y las zonas de alteración hidrotermal asociadas se distribuyen a lo largo de la falla de San Bartolomé, de dirección N‒S...

Drill rock cuttings from different depths of two geothermal wells (Az-26 and Az-49) from the Los Azufres Geothermal Field (LAGF), Mexico, were analyzed for rock magnetic properties (magnetic susceptibility, χ lf ; frequency-dependent susceptibility, χ fd; susceptibility of anhysteretic remanent magnetization, χ ARM ; isothermal remanent magnetizati...

The authors make the following corrections to this paper [...]

The formation of most fluorite deposits in northern Coahuila (NE Mexico) is explained through MVT models and are a part of the metallogenic province of northeastern Mexico. However, fluorite skarn deposits also occur in the same region, and there is evidence for late hydrothermal manifestations with no clear origin and evolution. The latter are the...

The origin of the mineralization at the world-class Las Cuevas (the largest single fluorite deposit in the world) has been historically disputed, essentially between skarn-related and Mississippi Valley Type (MVT) models. A systematic study of fluid inclusions in these deposits revealed that they were formed by low temperature (49 to 177 °C) and lo...

The Zn-Pb-Ag(-W) skarn deposits at Zacatepec (or Mɨɨygɨxy) in Oaxaca are associated with rocks of the Sierra Madre del Sur (SMS) magmatic province, and located in its easternmost part, in southern Mexico. This region consists of Eocene to Miocene calc-alkaline hypabyssal and volcanic rocks, with intermediate to felsic compositions that intrude or o...

The Tehuitzingo ultramafic body (Acatlán Complex, southern Mexico) is a strongly serpentinized harburgitic body that encloses chromitite bodies and blocks of eclogitic rocks. Hydrous retrograde metamorphism on chromitite bodies resulted in the formation of: i) partly altered chromite char- acterized by unaltered cores surrounded by Fe 2+ -rich and...

We developed equations and algorithms for solving a non-linear system of first order differential equations. The system represents a model for the kinetic dissolution and precipitation of minerals in aqueous electrolyte solutions. Our algorithm is valid for temperatures ranging from 20 to 320°C, pressures from 1 to 1000 bar, and ionic strengths of...

Manganese mineralization at Montaña de Manganeso, in central Mexico, is composed of manganese oxides that form sharp contacts with the host rock. The deposit occurs mainly as fault-controlled, irregular veins, which vary in width from about 5 m up to 30 m and are spatially related to black jasperoids.The presence of jasperoids, cavity-filling textu...

Unconventional geothermal systems such as Engineered Geothermal Systems (EGS) have been in the focus of interest for geothermal exploitation for several decades. In addition, the development and exploitation of high-temperature geothermal fields with supercritical conditions are emerging as a new hot topic in various parts of the world. In the GEMe...

In the tract of the Chihuahua and Sabina intracratonic basins , stratabound copper deposits are systematically hosted by siliciclastic rocks of the Las Vigas, San Marcos and Huizachal formations. The deposits in the Las Vigas area, Chihuahua, occur in the upper part of the Valanginian-Hauterivian Las Vigas Formation, which is conformably overlain b...

Volcanogenic massive sulfide (VMS) deposits are the most conspicuous type of deposits that formed during the Mesozoic in Mexico. Many Mexican VMS deposits display “classical” Kuroko-type mineral zonation and structure, and some of them, as Cuale and La Minita formed in shallow submarine environments. The most prospective time window for the formati...

The manganese mining district of Montaña de Manganeso is located to the northeast of the city of San Luis Potosí, 72 km northwest of the Charcas Ag-Pb-Zn-Cu mining district, in the central part of Mexico. In the district are exposed heavily folded and partially metamorphosed sedimentary series that host the ore mineralization and are attributed to...

A boiling model that considers the increase of salinity due to the steam loss and uses a combined density of the coexisting vapor and liquid phases was applied to fluid inclusion data from Los Azufres geothermal zone and froman Eocene epithermal vein of Taxco. These case studies are taken as examples of active and fossil hydrothermal systems, respe...

Mesozoic magmatic-hydrothermal iron oxide (MHIO) deposits in Mexico have been identified either (1) in regions close to the paleo-Pacific convergent margin, in Baja California and southwestern-southern Mexico, and (2) in regions several hundreds of kilometers inland from that margin, in Chihuahua and Sonora. The formation of these deposits started...

Previous depth estimations for ore forming fluids in boiling conditions do not consider salinity increase nor vapor bubble effect on the water column. • Such estimations show unreliable values for depth that vary between 15-50 % when compared to real ones. • We applied a model of boiling to an active and fossil hydrothermal system. The results sugg...

A boiling model that considers the increase of salinity due to the steam loss and uses a combined density of the coexisting vapor and liquid phases was applied to fluid inclusion data from Los Azufres geothermal zone and from an Eocene epithermal vein of Taxco. These case studies are taken as examples of active and fossil hydrothermal systems, resp...

Resumen Los sistemas petroleros de la cuenca del Sureste (Tabasco, México) se caracterizan por presentar rocas generadoras principalmente del Jurásico Superior, rocas almacén del Cretácico y rocas sello del Cretácico Superior-Cenozoico. Generalmente, la mayoría de estos reservorios refleja una compleja historia diagenética que depende de la porosid...

The opening of the Gulf of Mexico during the Mesozoic led to the formation of the Sabinas Basin. Large carbonate platforms were developed throughout the Lower and Middle Cretaceous. The basin provided ideal conditions for the formation of a suite of carbonate-hosted, stratabound deposits such as barite, celestine, fluorite, and lead–zinc of Barremi...

New 40 Ar/ 39 Ar (34.96 ± 0.19 Ma) and U-Pb ages (35.44 ± 0.24 and 34.95 ± 0.37 Ma) obtained in this study for the Calavera group of dikes, which predate intermediate sulfidation epithermal mineralization in the Taxco mining district, constrain the formation of such deposits to less than 34.96 Ma (latest Eocene). These deposits might arguably have...

This paper presents two new high-resolution geochronological determinations for the epithermal deposits in the World-class Guanajuato mining district, in central Mexico. These are a Rb-Sr isochron age in illite at 28.47 ± 0.55 Ma for the Villalpando and San Juan de Dios low sulfidation veins of the Sierra group of veins, and a 40Ar/39Ar plateau age...

A boiling model that considers the increase of salinity due to the steam loss and uses a combined density of the coexisting vapor and liquid phases was applied to fluid inclusion data from Los Azufres geothermal zone and from an Eocene epithermal vein of Taxco. These case studies are taken as examples of active and fossil hydrothermal systems, resp...

The Zn-Pb-Cu(-Ag±Au) San Martín deposit in northwestern Zacatecas is one of the most economically important and biggest skarns in Mexico. Mineral associations in this deposit belong to the sulfide skarn type (with rather " classical " prograde and retrograde zones) and contain peripheral subepithermal to epithermal veins. Re-Os ages were obtained f...

The Pirineo Block, in the Sabinas Basin, has source rocks formations with organic matter type II and III, and thermal maturity up to 2.5 %Rr to depth (“La Casita” Formation). The organic petrography application, fluid inclusions, and SEM samples of lithological column of the Pirineo Block, proved the influence into the rocks of TSR reactions, causi...

Desde hace unos 45 años, México fgura como pionero y líder en el continente Americano en la explotación de recursos geotérmicos para la generación comercial de electricidad. De los 24 países en el mundo que en 2015 utilizan la energía geotérmica para generar electricidad, México ocupa el cuarto lugar en importancia. La geotermia es una tecnología r...

The petroleum systems of the Southeast basin (Tabasco, Mexico) are characterized by having source rocks mainly from the Upper Jurassic, Cretaceous storage rocks, and Upper Cretaceous to Cenozoic seal rocks. In general, most of these reservoirs reflect a complex diagenetic history that depends on the prevailing porosity and permeability. A new appro...

New 40Ar/39Ar (34.96 ± 0.19 Ma) and U-Pb ages (35.44 ± 0.24 and 34.95 ± 0.37 Ma) obtained in this study for the Calavera group of dikes, which predate intermediate sulfidation epithermal mineralization in the Taxco mining district, constrain the formation of such deposits to less than 34.96 Ma (latest Eocene). These deposits might arguably have for...

In the vicinity of the city of Guanajuato, a marine volcanosedimentary sequence crops out hosting two volcanogenic massive sulfide (VMS) occurrences: Los Mexicanos with Fe−Cu−Zn, and Guapillos with Fe−Cu−Pb−Zn±Au−Ag. This sequence, from base to top, consists of: (a) submarine vitreous tuffs with clasts of andesitic composition, (b) interbedded ande...

In the vicinity of the city of Guanajuato, a marine volcanosedimentary sequence crops out hosting two volcanogenic massive sulfide (VMS) occurrences: Los Mexicanos with Fe−Cu−Zn, and Guapillos with Fe−Cu−Pb−Zn±Au−Ag. This sequence, from base to top, consists of: (a) submarine vitreous tuffs with clasts of andesitic composition, (b) interbedded ande...

Systematic radon measurements have been carried out at two high heat-producing wells in the geothermal field of Los Azufres Michoacan, Mexico. Both wells are located close to active faults across of which radon data in soil is also obtained. Radon content in geotermal fluids from producing energy wells shows to be strongly correlated with enthalpy

The Laramide Intrusive Arc constitutes a wide intrusive belt broadly parallel to the actual Sonora coastline. It was formed by the subduction of the Farallon Plate beneath the North-American Plate during the Late Cretaceous-Early Tertiary period. New isotopic data on rocks of this arc show initial Sr-87/Sr-86 and epsilon Nd isotopic values of 0.706...

The Lucy and Maria ore deposits are found within the Laramide belt or porphyry copper deposits in northeastern Sonora, their tonnage is medium-sized, and produce copper with subordinate molybdenum. The ages of the intrusions associated with the ores range between 64 and 67 Ma. Hydrothermal alteration developed on pegmatitic intrusives and consists...

The Mazatán barite deposits, Sonora, NW Mexico, represent an outstanding example of Paleozoic bedded barite, a poorly understood type of mineral deposit of major economic interest. The deposits of this type commonly occur hosted by shales and are characterized by the lack of base-metal sulfide mineralization, in contrast to classic sedimentary-exha...

The Lucy and María ore deposits are found within the Laramide belt or porphyry copper deposits in northeastern Sonora, their tonnage is medium-sized, and produce copper with subordinate molybdenum. The ages of the intrusions associated with the ores range between 64 and 67 Ma. Hydrothermal alteration developed on pegmatitic intrusives and consists...

In this work, the authors developed a computer program in MATLAB language for aqueous speciation and thermodynamic equilibrium calculations of vapor-liquid multicomponent phases below the critical temperature of water (647 K) and pressures up to 2 kilobar with two computational routines. The first routine calculates the aqueous speciation from the...