entitled "Understanding controls on hydrothermal dolomitization: insights from 3D RTM of geotherm... more entitled "Understanding controls on hydrothermal dolomitization: insights from 3D RTM of geothermal convection" presents very interesting numerical simulation exercises that give light to the problem of dolomite formation and Mg budgets. The exercises constitute very simplified scenarios of an ample fault system crosscutting from surface to a calcitic aquifer and basement, where the comparison between 2D and 3D models is of high significance. Although the results obtained are only descriptive of natural systems with the exact model settings, the authors rightly extrapolate some of the findings to general controls for hydrothermal dolomitization. The main
An open source library for environmental isotopic modelling using machine learning techniques
Stable isotopic composition modelling of water is an important part of resource management studie... more Stable isotopic composition modelling of water is an important part of resource management studies. We present a tool that estimates water stable isotope compositions using discontinuous inputs in time and space through machine learning algorithms. This tool has a multi-stage coupled algorithm that firstly calculates the parameters defined by the user that potentially affect the isotopic composition such as meteorological parameters, then, integrates the results of different parameters and generates the isotopic composition models for each time window. Isocompy time windows can be defined flexibly based on the amount of spatial-temporal properties of the available data. A variety of decision-making algorithms are implemented in this tool as an optional support to the user in different stages: from dataset preprocessing, outlier detection, statistical analysis, feature selection, model validation and calibration to postprocessing. Reports, figures, datasheets and maps could be genera...
Isotopic composition modelling is a key aspect in many environmental studies. This work presents ... more Isotopic composition modelling is a key aspect in many environmental studies. This work presents Isocompy, an open source Python library that estimates isotopic compositions through machine learning algorithms with user-defined variables. Isocompy includes dataset preprocessing, outlier detection, statistical analysis, feature selection, model validation and calibration and postprocessing. This tool has the flexibility to operate with discontinuous inputs in time and space. The automatic decision-making procedures are knitted in different stages of the algorithm, although it is possible to manually complete each step. The extensive output reports, figures and maps generated by Isocompy facilitate the comprehension of stable water isotope studies. The functionality of Isocompy is demonstrated with an application example involving the meteorological features and isotopic composition of precipitation in N Chile, which are compared with the results produced in previous studies. In essen...
Recent studies of Late Permian calc-alkaline lamprophyre dykes located in the Les Guilleries Pale... more Recent studies of Late Permian calc-alkaline lamprophyre dykes located in the Les Guilleries Paleozoic massif of the Catalan Coastal Range have revealed that allanite is present as the main REE-bearing accessory phase, which is the object of this study. The lamprophyre dykes are amphibole–plagioclase-dominated spessartites with a wide variety of accessory phases, including titanite, ilmenite, allanite, fluorapatite, spinel, zircon, and sulfides, and show complex alteration textures related to secondary albite, chlorite, epidote, titanite and calcite. The allanite crystal composition, analyzed by SEM-EPMA and LA-ICP-MS, evidences the solid solution between epidote and allanite with a ferriallanite component, similar to what is found in Variscan post-collisional granitoids from western Europe. However, heterogeneity in crystal shapes, sizes, type of zoning, dissolution embayment textures, growth of epidote coronas, mineral paragenesis, and the unique geochemical characteristics of all...
The manuscript entitled “Understanding controls on hydrothermal dolomitization: insights from 3D ... more The manuscript entitled “Understanding controls on hydrothermal dolomitization: insights from 3D RTM of geothermal convection” presents very interesting numerical simulation exercises that give light to the problem of dolomite formation and Mg budgets. The exercises constitute very simplified scenarios of an ample fault system crosscutting from surface to a calcitic aquifer and basement, where the comparison between 2D and 3D models is of high significance. Although the results obtained are only descriptive of natural systems with the exact model settings, the authors rightly extrapolate some of the findings to general controls for hydrothermal dolomitization. The main
entitled "Understanding controls on hydrothermal dolomitization: insights from 3D RTM of geotherm... more entitled "Understanding controls on hydrothermal dolomitization: insights from 3D RTM of geothermal convection" presents very interesting numerical simulation exercises that give light to the problem of dolomite formation and Mg budgets. The exercises constitute very simplified scenarios of an ample fault system crosscutting from surface to a calcitic aquifer and basement, where the comparison between 2D and 3D models is of high significance. Although the results obtained are only descriptive of natural systems with the exact model settings, the authors rightly extrapolate some of the findings to general controls for hydrothermal dolomitization. The main
Reactive transport modelling was carried out to simulate the transport and precipitation conditio... more Reactive transport modelling was carried out to simulate the transport and precipitation conditions of copper sulfide minerals in the sediment-hosted ore deposits of the Central African Copperbelt. The results illustrate the advancement of a mineral front due to the reaction of copper-rich fluids with host rocks. Chalcopyrite (CuFeS 2 ) initially precipitates in the reducing host rock and pyrite (FeS 2 ) dissolves, but the latter re-precipitates as a halo beyond the chalcopyrite. Continuous supply of copper causes the formation of the copper-rich sulfide bornite (Cu 5 FeS 4 ) followed by chalcocite (Cu 2 S) with precipitation of chalcopyrite and pyrite further down the flow direction. Anhydrite disappears where both copper sulfides and pyrite are precipitated. The modelled sulfide paragenesis and the general distribution of these minerals correspond to patterns observed in rocks within the Katanga Copperbelt.
Autoaprenentatge i autoavaluació en el reconeixement de minerals i de jaciments (Geologia)
Hem emprat l’eina d’autoavaluacio del Campus Virtual en dues assignatures de la llicenciatura de ... more Hem emprat l’eina d’autoavaluacio del Campus Virtual en dues assignatures de la llicenciatura de Geologia relacionades amb minerals, amb la idea de reforcar l’aprenentatge de la part mes teorica en una i la part mes practica l’altra. En totes dues vam crear uns repositoris de preguntes multiresposta: a l’assignatura de Jaciments Minerals cobrien el temari teoric i, en canvi, a l’assignatura de Mineralogia, les preguntes complementaven el material de practiques de laboratori (identificacio de minerals, en mostra de ma i al microscopi petrografic). En aquest darrer cas, es van construir a mes, 8 tests d’avaluacio automatica, que s’obrien als alumnes durant uns dies per tal que poguessin contestar-los fora d’hores de classe, amb ajut d’apunts si volien, durant un temps limitat establert per nosaltres. En vista dels resultats i les opinions dels alumnes, creiem que val la pena fer l’esforc de crear repositoris de preguntes i utilitzar l’eina d’autoavaluacio, i mes encara per a l’avaluacio de la part practica, on solen tenir mes dificultats per a jutjar el propi aprenentatge al llarg del curs.
International Journal of Environmental Research and Public Health
Because of the rising environmental and health concerns associated with atmospheric pollution cau... more Because of the rising environmental and health concerns associated with atmospheric pollution caused by potentially toxic elements (PTEs), several road dust studies have been performed across the world in recent decades. This paper illustrates the effects of particle size on the PTE contents, mineralogical composition, environmental pollution and health risk assessments in road dust from Barcelona (Spain). The samples were sieved into five size fractions ranging from <45 to 500–800 µm. Although the major mineral contents (tectosilicates, phyllosilicates, and carbonates) were profuse in all fractions, the identified inhalable PTE particles (e.g., Fe, Cr, Cu, Zn, Ni, and REE), with size < 10 µm, were more pervasive in the finest fraction (<45 μm). This is consistent with the concentrations measured: the finest fractions were richer in PTEs than the coarser ones, resulting in a direct correlation with the enrichment factor (EFx), geo-accumulation (Igeo), and non-carcinogenic (...
Foreland fold and thrust belts always represent a complex diagenetic history of carbonate success... more Foreland fold and thrust belts always represent a complex diagenetic history of carbonate succession, particularly multiphase dolomitization, due to the multi-sourcing nature of fluids affecting syn-to post-depositional successions. The present work documents a comprehensive study on the diagenetic changes, particularly dolomitization patterns in the Jurassic carbonates (Samana Suk Fm) in the Lesser Himalayan fold and thrust belt, NW Pakistan. To better understand the processes involved, integrated field/petrographic, geochemical, isotopic, and micro-thermometric studies were carried out. Field observations indicate that dolostones appear as light grey to brown stratabound and patchy units within the formation. Petrographic analysis reveals that fabric destructive matrix dolomite (RD-I) and fabric preserving replacive dolomite (RD-II) phases are present as distinct units. In addition, saddle dolomite cement (SD) and fracture-filling calcite (CC) are also observed in association with...
La mineralización de tipo epitermal de alta sulfuración en Cerro Quema ocurre en un lithocap de c... more La mineralización de tipo epitermal de alta sulfuración en Cerro Quema ocurre en un lithocap de cuarzo vuggy y alteración argílica avanzada, y está compuesta por un primer estadio de diseminaciones y microvetas de pirita, calcopirita, enargita, tennantita y en menor cantidad esfalerita. Este tipo de mineralización está cortada por un segundo estadio más joven de vetillas que contienen cuarzo, barita, pirita, calcopirita, esfalerita y galena. Posteriormente, los procesos de meteorización y oxidación produjeron dos zonas mineralizadas distintas en Cerro Quema; (1) Zona de sulfuros: zona más profunda del yacimiento, caracterizada por alteración/mineralización hipogénica, con menor grado de enriquecimiento secundario pero libre de óxidos, y (2) Zona de óxidos: zona superficial caracterizada por óxidos de hierro, desarrollada hasta ~150 m de profundidad y sobreimpuesta a la
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Papers by Mercè Corbella