Article
Geochemistry & Geophysics
Karel Breiter, Michaela Vasinova Galiova, Michaela Hlozkova, Zuzana Korbelova, Jindrich Kynicky, Hilton Tulio Costi
Summary: About 2600 spot analyses of mica were performed to characterize the element contents and chemistry of mica from eight rare-metal granite (RMG) plutons. The study found that the composition of mica is related to the rock type and genesis, and micas from different types of granites have different element enrichment characteristics. With magma fractionation, the contents of some elements in mica increase while the contents of high-field-strength elements usually decrease. In addition, the study on mica crystallization and hydrothermal events also yielded some results.
Review
Geochemistry & Geophysics
Encarnacion Roda-Robles, Pedro Pablo Gil-Crespo, Alfonso Pesquera, Alexandre Lima, Idoia Garate-Olave, Enrique Merino-Martinez, Joana Cardoso-Fernandes, Jon Errandonea-Martin
Summary: Apatite can serve as a useful tool for studying the evolution of granitic magmas and exploration of pegmatites. The composition of apatite varies in different types of rocks, with increasing manganese content associated with magma evolution, while decreasing rare earth elements content. Apatite can provide valuable information about the petrogenesis of pegmatites and granites.
Article
Multidisciplinary Sciences
Krishna C. Polavaram, Nishant Garg
Summary: A newly developed Raman imaging protocol is capable of mapping unpolished samples with an auto-focusing Z-mapping feature for direct fingerprinting of different polymorphs. The methodology for generating high-fidelity phase maps using characteristic peak intensity ratios can be extended to any multi-phase, heterogenous system. These enhancements allow rapid mapping of unpolished granite specimens with high accuracy and fine spatial resolution.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Yan Jing, Hao Yang, Wen-chun Ge, Yu Dong, Zheng Ji, Jun-hui Bi, Hong-ying Zhou, De-he Xing
Summary: This study analyzed the data of geochronology, whole-rock geochemistry, whole-rock Sr-Nd, and in-situ zircon Hf isotopic study of Early Mesozoic granites, providing important information about the subduction and final closure processes of the Paleo-Asian Ocean. The studied granites showed adakite-like affinities and originated from partial melting of thickened lower crust, with a mixture of major recycled old components and limited juvenile crustal materials. The findings also suggested a tectonic transition from prolonged subduction to the final closure of the Paleo-Asian Ocean, which is related to the formation of collision-related adakitic granitoids in the southeastern Central Asian Orogenic Belt (CAOB).
Article
Geosciences, Multidisciplinary
Eloi Gonzalez-Esvertit, Juan Alcalde, Enrique Gomez-Rivas
Summary: Evaporites have unique mechanical properties and play key roles in structural and stratigraphical architecture, as well as mineral deposits and petroleum systems. The Iberian Evaporite Structure Database (IESDB) is the first comprehensive assessment of evaporite structures and provides valuable information for geoscience-based technologies and addressing societal challenges.
EARTH SYSTEM SCIENCE DATA
(2023)
Article
Geochemistry & Geophysics
Imma Palomeras, Siddique A. Ehsan, David J. Martinez Poyatos, Puy Ayarza, David Marti, Ramon Carbonell, Antonio Azor, Luis M. Parra, Ignacio Marzan
Summary: The nature of the crust beneath central Iberia was estimated using wide-angle seismic reflection/refraction transect, revealing regional variations in the composition of the upper and lower crust. The upper crust is mainly composed of low-grade metasedimentary rocks in the southern and central segments, while the northern segment is dominated by igneous rocks. A sharp boundary between the two crustal layers is observed between 12 km (south) and 18 km (north) depth, with the lower crust showing low Poisson's ratios suggesting a felsic composition. Interactions with mafic components are suggested by lamination observed in the data.
Article
Geosciences, Multidisciplinary
C. Villaseca, D. Orejana, P. Higueras, C. Perez-Soba, J. Garcia Serrano, S. Lorenzo
Summary: The study analyzes the evolution of continental lithosphere beneath western Iberia and its relationship with central European lithosphere. It finds that two orogenic events in the region triggered significant magmatic activity, along with intracrustal recycling and crustal thickening. Minor crustal subduction signatures are observed after these orogenic events, suggesting the presence of an old enriched subcontinental mantle beneath central Iberia. Additionally, mantle-derived magmas from central European terranes show distinct geochemical tracers compared to the studied central Iberian terrane. Furthermore, post-Variscan mafic magmatism indicates lithospheric mantle rejuvenation through widespread asthenospheric upwelling in western circum-Mediterranean areas. However, minor episodes of intraplate K-rich alkaline magmatism in southern Mediterranean Europe suggest a complex lithospheric/asthenospheric mantle flow regime during post-collisional convergence between Africa and Eurasia.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Rong Yin, Xiao-Long Huang, Ru-Cheng Wang, Xiao-Ming Sun, Yong Tang, Yu Wang, Yi-Gang Xu
Summary: Rare-metal mineralization in aluminous granites is associated with magma fractionation, enrichment in fluxing elements, and both magmatic and hydrothermal processes. This study investigates these mechanisms in the Yashan rare-metal granitic pluton in South China and finds that magmatic-hydrothermal processes are critical for rare-metal enrichment and Nb-Ta fractionation in RMGs.
JOURNAL OF PETROLOGY
(2022)
Article
Geosciences, Multidisciplinary
Ricardo Pereira, Filipe Rosas, Joao Mata, Patricia Represas, Claudia Escada, Beatriz Silva
Summary: The study reveals the combined effects of post-rift magma emplacement and tectonic inversion on the hyper-extended West Iberian Margin, with distinctive deformation styles within each tectonic phase and significant Late Cretaceous inversion. Detailed analysis of the laccolith shows unique deformation patterns associated with magma ascent and its interference during subsequent transpressive inversion. The wider impact of post-rift magmatism and the emplacement of sub-lithospheric magma on the rheology of a thinned continental crust is also considered, along with implications for source rock organic maturity modelling.
Article
Geography
Johanna Arias, Alejandra Mabel Geraldi, Federico Gaston Barragan, Lucia Manuela Laffeuillade
Summary: The Tres Arroyos department has experienced recurrent floods in recent years, resulting in significant economic losses in both urban and rural areas. To address this issue, the objective is to investigate the hydrometeorological factors contributing to wet periods and identify flood-prone areas between 2000 and 2018 using remote sensing and geographic information systems.
ESTUDIOS GEOGRAFICOS
(2022)
Article
Energy & Fuels
Hua Wang, Xumei Mao, Cuiming Li, Yaqun Dong, Jianqiao Ye
Summary: This study discusses the high sodium ion (Na+) contents in the medium-low temperature geothermal waters in granites, and finds that the dissolution of feldspar in deep geofluids under high temperature and pressure significantly contributes to the high Na+ contents, while the dissolution of granite minerals can only provide low Na+ contents.
Article
Environmental Sciences
Beatriz Lara, Jesus Rojo, Ana R. Costa, Ana M. Burgos-Montero, Celia M. Antunes, Rosa Perez-Badia
Summary: More than one quarter of the population in industrialised countries suffers from allergies, primarily caused by inhaled pollen. This study analysed the concentrations of airborne allergens and their relationship with pollen concentrations in two urban areas in Spain and Portugal. Weather conditions up to 6 days prior were found to affect the discrepancies in this relationship. The findings provide insights for improving allergy risk prediction models based on atmospheric pollen.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Chemistry, Multidisciplinary
Essam Sidique, Mervat A. Elhaddad, Sayed F. Abdelwahab, Hany H. El Hadek
Summary: This study conducted a thorough radio- and chem-ecological evaluation of ElSibai-Abu ElTiyur granites in Egypt's crystalline basement rocks, demonstrating that these granites are safe for use as building materials and comply with global safety standards.
APPLIED SCIENCES-BASEL
(2021)
Article
Environmental Sciences
Nerea Pineiro-Juncal, Elena Diaz-Almela, Carmen Leiva-Duenas, Ona Deulofeu, Jaime Frigola, Montserrat Soler, Antonio Martinez-Cortizas, Santiago Giralt, Jordi Garcia-Orellana, Miguel Angel Mateo
Summary: Understanding the biogeochemistry of seagrass soils, especially in the rhizosphere and below, is crucial for comprehending their long term formation processes. Terrestrial runoff plays a key role in meadow soil composition, and carbon accumulation in the soil does not follow a general depth trend, indicating temporal variation in carbon inputs as an important factor. Further research on metal behavior is needed to fully utilize seagrass meadows as environmental records.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Chemistry, Multidisciplinary
Handoyo Handoyo, Juan Alcalde, Irene DeFelipe, Imma Palomeras, Raquel Martin-Banda, Julian Garcia-Mayordomo, David Marti, Jose J. Martinez-Diaz, Juan Miguel Insua-Arevalo, Teresa Teixido, Ignacio Marzan, Ramon Carbonell
Summary: This study focuses on characterizing the thickness and lateral variations of the critical zone (CZ) in the Eastern Betic Shear Zone (EBSZ) using interdisciplinary geophysical methods. The results help interpret the shallow subsurface structure and reveal the relationships between the CZ thickness, fault zone, topographic slope, and geological units. These findings enhance the understanding of the shallow subsurface of active faults and improve CZ assessment in tectonically active regions.
APPLIED SCIENCES-BASEL
(2022)
Article
Mineralogy
Axel Muller, William Simmons, Hartmut Beurlen, Rainer Thomas, Peter M. Ihlen, Michael Wise, Encarnacion Roda-Robles, Ana M. R. Neiva, Victor Zagorsky
Summary: This study is the precursor and complementary study for the classification of granitic pegmatites, analyzing existing classification criteria and proposing a new classification scheme.
CANADIAN MINERALOGIST
(2022)
Article
Geology
Jose Torres-Ruiz, Alfonso Pesquera, Pedro P. Gil-Crespo, Antonio Delgado
ORE GEOLOGY REVIEWS
(2020)
Article
Multidisciplinary Sciences
Alfonso Pesquera, Encarnacion Roda-Robles, Pedro P. Gil-Crespo, David Valls, Jose Torres Ruiz
SCIENTIFIC REPORTS
(2020)
Article
Environmental Sciences
Joana Cardoso-Fernandes, Joao Silva, Monica M. Perrotta, Alexandre Lima, Ana C. Teodoro, Maria Anjos Ribeiro, Filipa Dias, Odile Barres, Jean Cauzid, Encarnacion Roda-Robles
Summary: Reflectance spectroscopy has been utilized to study the spectral behavior of lithium minerals and pegmatites, aiding in their identification and discrimination from other mineral types. The use of satellite data showed promise for discriminating lithium pegmatites based on distinct reflectance magnitude and mineral assemblages. However, limitations and advantages of using multi- and hyperspectral data were discussed for future applications in mineral exploration.
Article
Geochemistry & Geophysics
Lorena Hernandez-Filiberto, Encarnacion Roda-Robles, William B. Simmons, Karen L. Webber
Summary: Almandine-spessartine garnets from different pegmatites show significant compositional variations, with the most fractionated pegmatites exhibiting high Mn, Nb, Ta, Zr, and Hf values. The major element zoning in garnet samples displays increasing Mn values from core to rim, while the chondrite normalized HREE spectra differ among garnets from different pegmatite types. Ion exchange mechanisms could explain most of the observed compositional variations in these garnets, reflecting differences in the composition of the pegmatitic magma and the competition of coexisting mineral phases for certain chemical elements.
Article
Geochemistry & Geophysics
Axel Muller, William Keyser, William B. Simmons, Karen Webber, Michael Wise, Hartmut Beurlen, Idoia Garate-Olave, Encarnacion Roda-Robles, Miguel Angel Galliski
Summary: Analysis of quartz from different pegmatites worldwide using LA-ICP-MS revealed that the chemistry of pegmatite quartz is mainly controlled by the source rock chemistry of pegmatite melts. Chemically primitive pegmatites may be suitable for high-tech applications, while quartz with high concentrations of Li and Al may indicate economic mineralization.
Article
Geochemistry & Geophysics
Joana Cardoso-Fernandes, Jessica Lima, Alexandre Lima, Encarnacion Roda-Robles, Martin Koehler, Stefan Schaefer, Andreas Barth, Andreas Knobloch, Mario A. Goncalves, Filipe Goncalves, Ana Claudia Teodoro
Summary: The study reprocessed historical stream sediment datasets using spatial interpolation and catchment basin analysis methods to determine pathfinder elements for lithium mineralization and compared the performance of the two approaches. The results showed that the spatial interpolation method is more suitable for early-stage exploration, while the catchment basin method is more suitable for larger-scale exploration.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2022)
Review
Geochemistry & Geophysics
Miguel Angel Galliski, Maria Florencia Marquez-Zavalia, Encarnacion Roda-Robles, Albrecht von Quadt
Summary: The Li-bearing pegmatites in the Pampean Pegmatite Province (PPP) are rare-element pegmatites occurring in a pegmatite belt in southwestern Gondwana. These pegmatites, belonging to the LCT petrogenetic family, exhibit enrichments of Li, Rb, Nb, Ta, Be, P, B, and Bi. They are thought to have formed through fractionation of granitic melts produced by anatexis of Gondwana-derived sediments. The pegmatites, mostly orogenic in nature, were emplaced during the Pampean and Famatinian orogenies, with a few being postorogenic and related to A-type granites. The known resources of spodumene in the area are estimated to be 200,000 tonnes, with the potential for future discoveries and resource expansion.
Article
Geology
Jon Errandonea-Martin, Idoia Garate-Olave, Encarnacion Roda-Robles, Joana Cardoso-Fernandes, Alexandre Lima, Maria dos Anjos Ribeiro, Ana Claudia Teodoro
Summary: Fluid-assisted mass transfer and re-equilibration of mineral phases are common consequences of metasomatism associated with igneous intrusions. Rare-element granitic pegmatites are of great importance in mineral exploration and geochemical studies of their related aureoles contribute to the development of exploration targeting techniques.
ORE GEOLOGY REVIEWS
(2022)
Review
Geochemistry & Geophysics
Encarnacion Roda-Robles, Pedro Pablo Gil-Crespo, Alfonso Pesquera, Alexandre Lima, Idoia Garate-Olave, Enrique Merino-Martinez, Joana Cardoso-Fernandes, Jon Errandonea-Martin
Summary: Apatite can serve as a useful tool for studying the evolution of granitic magmas and exploration of pegmatites. The composition of apatite varies in different types of rocks, with increasing manganese content associated with magma evolution, while decreasing rare earth elements content. Apatite can provide valuable information about the petrogenesis of pegmatites and granites.
Editorial Material
Geochemistry & Geophysics
Axel Mueller, Encarnacion Roda-Robles
Article
Geochemistry & Geophysics
Filipa Dias, Ricardo Ribeiro, Filipe Goncalves, Alexandre Lima, Encarnacion Roda-Robles, Tania Martins
Summary: In pegmatites with abundant petalite and spodumene, calibrating a portable laser-induced breakdown spectroscopy (pLIBS) equipment to identify and analyze these minerals is challenging. Samples of spodumene, petalite, and spodumene + quartz were collected from aplite-pegmatites in the Barroso-Alvao (BA) field and analyzed using inductively coupled plasma-mass spectroscopy. One calibration for both minerals was impossible due to overlapping LIBS intensity ratios. Three calibrations were developed: one qualitative and two quantitative for each mineral. Thin sections and cathodoluminescence (CL) were used to verify sample purity and mineral paragenesis.
Article
Geochemistry & Geophysics
Encarnacion Roda-Robles, Romeu Vieira, Alexandre Lima, Jon Errandonea-Martin, Alfonso Pesquera, Joana Cardoso-Fernandes, Idoia Garate-Olave
Summary: Based on field and petrographic observations, mineralogical, geochemical and geochronological data, this study classified the pegmatites and cassiterite-rich quartz veins in the Fregeneda-Almendra field and revealed their relationships with different magmatic events.
Article
Computer Science, Information Systems
Joana Cardoso-Fernandes, Joao Silva, Filipa Dias, Alexandre Lima, Ana C. Teodoro, Odile Barres, Jean Cauzid, Monica Perrotta, Encarnacion Roda-Robles, Maria Anjos Ribeiro
Summary: This research established a spectral library dedicated to lithium minerals and lithium pegmatite exploration using satellite remote sensing. The database includes field and laboratory spectra from the region of Spain-Portugal, along with a wealth of supplementary data. Its major advantages include being provided in a universal file format, allowing users to compare field and laboratory spectra, and facilitating comparisons of different lithium minerals' absorption features.