María Pura Alfonso Abella

Universitat Politècnica de Catalunya

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Carles Canet

Universidad Nacional Autónoma de México

Joan Carles Melgarejo i Draper

Universitat de Barcelona

Maite Garcı́a-Vallés

Universitat de Barcelona

Abdorrahman Rajabi

University of Tehran

Eduardo Gonzáléz-Partida

Universidad Nacional Autónoma de México

Antoni Camprubí

Universidad Nacional Autónoma de México

Hernán Anticoi

Universitat Politècnica de Catalunya

Joaquín A. Proenza

Universitat de Barcelona

Josep Oliva Moncunill

Universitat Politècnica de Catalunya

Anthony E. Fallick

Scottish Universities Environmental Research Centre

Cooperative Institutions

Universitat de Barcelona

Universitat Politècnica de Catalunya

Universidad Nacional Autónoma de México

Centre National de la Recherche Scientifique

Universitat Autònoma de Barcelona

Consejo Superior de Investigaciones Científicas

Tarbiat Modares University

Mexican Geological Survey

University of Tehran

Agostinho Neto University

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

PALEOREDOX CONDITIONS DURING THE CENOMANIAN-TURONIAN IN CENTRAL MEXICO AND THEIR RELATION TO OCEANIC ANOXIC EVENT 2

Abstracts with programs - Geological Society of America (2018)

Azucena Colín-Rodríguez Fernando Núñez Useche Thierry Adatte María Pura Alfonso Abella

Lithology, microfacies (M1 to M6

Cenomanian

10.1130/abs/2018am-322639

Cite

Citations (0)

Sulfur-isotope variation in volcanic-associated massive sulfides of the Northern Apennine ophiolites (Italy)

Giorgio Garuti Federica Zaccarini María Pura Alfonso Abella Joaquín A. Proenza

Source

Cite

Citations (0)

Bioevents and redox conditions around the Cenomanian–Turonian anoxic event in Central Mexico

Palaeogeography Palaeoclimatology Palaeoecology (2016)

Fernando Núñez‐Useche Carles Canet Ricardo Barragán María Pura Alfonso Abella

Cenomanian

10.1016/j.palaeo.2016.01.035

Cite

Citations (53)

Mineralization and Structural Controls of the AB-Bid Carbonate-Hosted Pb-Zn (±Cu) Deposit, Tabas-Posht e Badam Metallogenic Belt, Iran

Minerals (2022)

Abdorrahman Rajabi Carles Canet María Pura Alfonso Abella Pouria Mahmoodi Ali Yarmohammadi

The Ab-Bid deposit, located in the Tabas-Posht e Badam metallogenic belt (TPMB) in Central Iran, is the largest Pb-Zn (±Cu) deposit in the Behadad-Kuhbanan mining district. Sulfide mineralization in the Ab-Bid deposit formed in Middle Triassic carbonate rocks and contains galena and sphalerite with minor pyrite, chalcopyrite, chalcocite, and barite. Silicification and dolomitization are the main wall-rock alteration styles. Structural and textural observations indicate that the mineralization occurs as fault fills with coarse-textured, brecciated, and replacement sulfides deposited in a bookshelf structure. The Ab-Bid ore minerals precipitated from high temperature (≈180–200 °C) basinal brines within the dolomitized and silicified carbonates. The sulfur isotope values of ore sulfides suggest a predominant thermochemical sulfate reduction (TSR) process, and the sulfur source was probably Triassic-Jurassic seawater sulfate. Given the current evidence, mineralization at Ab-Bid resulted from focusing of heated, over-pressurized brines of modified basinal origin into an active fault system. The association of the sulfide mineralization with intensely altered wall rock represents a typical example of such features in the Mississippi Valley-type (MVT) metallogenic domain of the TPMB. According to the structural data, the critical ore control is a bookshelf structure having mineralized dextral strike-slip faults in the northern part of the Ab-Bid reverse fault, which seems to be part of a sinistral brittle shear zone. Structural relationships also indicate that the strata-bound, fault-controlled Ab-Bid deposit was formed after the Middle Jurassic, and its formation may be related to compressive and deformation stages of the Mid-Cimmerian in the Middle Jurassic to Laramide orogenic cycle in the Late Cretaceous-Tertiary.

Dolomitization

10.3390/min12010095

Cite

Citations (3)

The Importance of Mineralogical Knowledge in the Sustainability of Artisanal Gold Mining: A Mid-South Peru Case

Minerals (2019)

María Pura Alfonso Abella Hernán Anticoi Teresa Yubero Marc Bascompta Laura Henao

Mineralogy and gold processing techniques from several mining areas of the Nazca-Ocoña gold belt, Mid-South Peru, were investigated to assess the efficiency of gold extraction methods in relation to their mineralogy. The deposits from this belt are intrusion gold related to mineralization in quartz veins. Native gold occurs as micrometric grains encapsulated in pyrite and in minor amounts in other sulfides and quartz. Electrum is found mainly in fractures of pyrite and attains up to 35 wt. % Ag. In addition to these occurrences, gold tellurides also occur and they are abundant in San Luis. Gold processing is carried out by amalgamation with mercury and/or cyanidation. The comparison of the gold grade in the mineralizations and in the residual tailings indicates that a significant amount of gold is not recovered using the mercury amalgamation process and also, in the case of the gold recovery by cyanidation, except when cement was added to the cyanide solution. This was due to an increase in the pH that favours the dissolution of the gold matrix. In the cyanidation process carried out in tailings previously treated with mercury, part of the mercury retained in them is released to the atmosphere or to the cyanidation fluids.

Gold cyanidation

Gold extraction

Mercury

Gold ore

10.3390/min9060345

Cite

Citations (16)

Effect of pH and Fe(III) ions on chalcopyrite bioleaching by an adapted consortium from biogas sweetening

Minerals Engineering (2012)

Antonio David Dorado Castaño Montserrat Solé Concepción Lao Luque María Pura Alfonso Abella Xavier Gamisans

Biogas

Sweetening

10.1016/j.mineng.2012.06.009

Cite

Citations (27)

Composición de la Turmalina de las Pegmatitas Graníticas de Giraúl, Angola

Macla: revista de la Sociedad Española de Mineralogía (2008)

Antonio Olympio Gonçalves Joan Carles Melgarejo i Draper María Pura Alfonso Abella A Paniagua

Source

Cite

Citations (2)

La geologia social

Josep Maria Mata Perelló Roger Mata Lleonart María Pura Alfonso Abella David Parcerisa Duocastella

En la Geologia Social (una de les noves branques de les Ciencies Geologiques) es proposa una nova metodologia per a caracteritzar i estudiar els dos elements geologics clau en el desenvolupament sostenible i etic de la societat (AYALA 1999 i 2002). Els recursos i els riscos geologics, per tal d'ampliar conceptes que permetin realitzar estudis i establir directrius de gestio mes adaptades a la situacio social del nostre voltant. (AYALA et altri, 2004). Tot i aixi, en aquesta presentacio ens centrarem fonamentalment en les repercussions sobre la societat dels riscos geologics, tant dels naturals com dels induits (KRAAS et altri, 2005).

Source

Cite

Citations (0)

Geology, ore facies and sulphur isotopes of the Koushk vent-proximal sedimentary-exhalative deposit, Posht-e-Badam Block, Central Iran

International Geology Review (2012)

Abdorrahman Rajabi Ebrahim Rastad María Pura Alfonso Abella Carles Canet

The Koushk zinc–lead deposit in the central part of the Zarigan–Chahmir basin, central Iran, is the largest of several sedimentary–exhalative (SEDEX) deposits in this basin, including the Chahmir, Zarigan, and Darreh-Dehu deposits. The host-rock sequence consists of carbonaceous, fine-grained black siltstone with interlayered rhyolitic tuffs. It corresponds to the upper part of the Lower Cambrian volcano-sedimentary sequence that was deposited on the Posht-e-Badam Block due to back-arc rifting of the continental margin of the Central Iranian Microcontinent. This block includes the late Neoproterozoic metamorphic basement of the Iran plate, overlain by rocks dating from the Early Cambrian to the Mesozoic. Based on ore body structure, mineralogy, and ore fabric, we recognize four different ore facies in the Koushk deposit: (1) a stockwork/feeder zone, consisting of a discordant mineralization of sulphides forming a stockwork of sulphide-bearing dolomite (quartz) veins cutting the footwall sedimentary rocks; (2) a massive ore/vent complex, consisting of massive replacement pyrite, galena, and sphalerite with minor arsenopyrite and chalcopyrite; (3) bedded ore, with laminated to disseminated pyrite, sphalerite, and galena; and (4) a distal facies, with minor disseminated and laminated pyrite, banded cherts, and disseminated barite. Carbonatization and sericitization are the main wall-rock alterations; alteration intensity increases towards the feeder zone. The δ34S composition of pyrite, sphalerite, and galena ranges from +6.5 to +36.7‰. The highest δ34S values correspond to bedded ore (+23.8 to +36.7‰) and the lowest to massive ore (+6.5 to + 17.8‰). The overall range of δ34S is remarkably higher than typical magmatic values, suggesting that sulphides formed from the reduction of seawater sulphate by bacteriogenic sulphate reduction in a closed or semi-closed system in the bedded ore, whereas thermochemical sulphate reduction likely played an important role in the feeder zone. Sulphur isotopes, along with sedimentological, textural, mineralogical, and geochemical evidences, suggest that this deposit should be classified as a vent-proximal SEDEX ore deposit.

Stockwork

δ34S

Ore genesis

10.1080/00206814.2012.659106

Cite

Citations (46)

Mineralogy and Distribution of Critical Elements in the Sn–W–Pb–Ag–Zn Huanuni Deposit, Bolivia

Minerals (2019)

Andreu Cacho Joan Carles Melgarejo i Draper Antoni Camprubí Lisard Torró Montgarri Castillo-Oliver

The polymetallic Huanuni deposit, a world-class tin deposit, is part of the Bolivian tin belt. As a likely case for a “mesothermal” or transitional deposit between epithermal and porphyry Sn types (or shallow porphyry Sn), it represents a case that contributes significantly to the systematic study of the distribution of critical elements within the “family” of Bolivian tin deposits. In addition to Sn, Zn and Ag, further economic interest in the area resides in its potential in critical elements such as In, Ga and Ge. This paper provides the first systematic characterisation of the complex mineralogy and mineral chemistry of the Huanuni deposit with the twofold aim of identifying the mineral carriers of critical elements and endeavouring plausible metallogenic processes for the formation of this deposit, by means of a multi-methodological approach. With In concentrations consistently over 2000 ppm, the highest potential for relevant concentrations in this metal resides in widespread tin minerals (cassiterite and stannite) and sphalerite. Hypogene alteration assemblages are hardly developed due to the metasedimentary nature of host rocks, but the occurrence of potassium feldspar, schorl, pyrophyllite and dickite as vein material stand for potassic to phyllic or advanced argillic alteration assemblages and relatively high-temperature (and low pH) mineralising fluids. District-scale mineralogical zonation suggests a thermal zonation with decreasing temperatures from the central to the peripheral areas. A district-scale zonation has been also determined for δ34SVCDT values, which range −7.2‰ to 0.2‰ (mostly −7‰ to −5‰) in the central area and −4.2‰ to 1.0‰ (mainly constrained between −2‰ and 1‰) in peripheral areas. Such values stand for magmatic and metasedimentary sources for sulfur, and their spatial zoning may be related to differential reactivity between mineralising fluids and host rocks, outwardly decreasing from the central to the peripheral areas.

Cassiterite

Mesothermal

Hypogene

Argillic alteration

Arsenopyrite

Prospecting

10.3390/min9120753

Cite

Citations (6)