Article
Geosciences, Multidisciplinary
Samuel Angiboust, Jesus Munoz-Montecinos, Aitor Cambeses, Tom Raimondo, Damien Deldicque, Antonio Garcia-Casco
Summary: Recent seismological studies have found transient seismicity clusters in the mantle wedge above subduction zones, but their physical significance remains poorly understood. This study documents brittle-viscous features in jadeitites from Russia, Myanmar, and Guatemala, providing insights into deformation mechanisms in deep subduction environments. The observed deformation patterns in these jadeitites suggest external fluid influx within fracture zones, contributing to seismic instabilities in the mantle wedge.
EARTH-SCIENCE REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Juan Cardenas-Parraga, Antonio Garcia-Casco, Idael F. Blanco-Quintero, Yamirka Rojas-Agramonte, Kenya Nunez Cambra, George E. Harlow
Summary: This passage discusses the formation of jadeitites and related rocks in a subduction-related block in eastern Cuba. Through various geochemical data and fluid interactions, it explains the mineral composition and metamorphism within the rocks.
AMERICAN JOURNAL OF SCIENCE
(2021)
Article
Geochemistry & Geophysics
Hui-Chao Rui, Jing-Sui Yang, Jian-Ping Zheng, Angelica I. Llanes Castro, Fei Liu, Yong Wu, Wei-Wei Wu, Yurisley Valdes Marino, Ahmed E. Masoud
Summary: This study investigates the origin of the Moa-Baracoa ophiolitic massif in Cuba and suggests that it formed in a forearc environment during the early Cretaceous. The zircon ages and geochemical features of different rock samples indicate different formation processes, and the presence of subduction-related fluid in the rocks suggests the complexity of ophiolite formation.
Article
Geology
Hui-Chao Rui, Jing-Sui Yang, Angelica I. Llanes Castro, Jian-Ping Zheng, Dong-Yang Lian, Wei-Wei Wu, Yurisley Valdes Marino
Summary: Podiform chromitite is an important archive that provides detailed information on mantle magmatism, heterogeneity, and dynamics. This study investigates the petrogenesis and geodynamic settings of high-Al podiform chromitites from the Moa-Baracoa ophiolitic massif in eastern Cuba. The results suggest that these chromitites originated from a nascent forearc mantle during subduction initiation.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Haoyu Hu, Yamirka Rojas-Agramonte, Sandra Carrasquilla, Concepcion Lazaro, Iturralde Vinent, Antonio Garcia-Casco
Summary: The Mabujina Complex in south-central Cuba consists of metamorphosed volcanic and subvolcanic rocks. It has been debated whether the protoliths of the complex originated from the Caribbean volcanic arc or the Guerrero Arc of Mexico. New geochemical analyses suggest a Caribbean origin, but the complex cannot represent the root of the volcanic arc. Instead, it is proposed to be a fragment of the mid-Cretaceous Caribbean arc that was tectonically emplaced below the same arc due to arc segmentation and strike-slip trans-compression.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
An-Xia Chen, Xi Chen, Yi Chen, Xi-Qiu Han, Ye-Jian Wang, Fang Huang
Summary: This study investigates the Fe isotope signature of subduction zone fluids by analyzing the Fe isotope data of Myanmar jadeitites. The results reveal the characteristics of the subduction zone fluids during the formation of jadeitites, providing important insights into the Fe cycling in the subduction zone.
Article
Geochemistry & Geophysics
Yunchao Shu, Sune G. Nielsen, Veronique Le Roux, Jerzy Blusztajn, Shun Guo, Fang Huang
Summary: In this study, the Tl concentration and Tl isotope characteristics of high-pressure metamorphic veins and host eclogites in the Dabie terrane were investigated. The results indicate that phengite controls the overall inventory of Tl in the host eclogites and that the fluids responsible for vein formation were derived from phengite-bearing eclogites. The study also suggests that fluids derived from eclogite dehydration are characterized by higher Cs/Tl ratios compared to their host eclogites. Arc magmas with high Cs/Tl and low Ba/Th ratios likely contain residual phengite at subarc depths.
Article
Geology
Lidia Butjosa, Aitor Cambeses, Joaquin A. Proenza, Samuele Agostini, Manuel Iturralde-Vinent, Luis Bernal-Rodriguez, Antonio Garcia-Casco
Summary: The Villa Clara serpentinite-matrix melange in central Cuba is part of the large ophiolitic belt of the Greater Antilles. The composition of ultramafic and mafic rocks allows classifying them into two main groups: MORB-like mantle typical of abyssal peridotite and refractory mantle-wedge forearc peridotites. These two groups indicate different melting processes and the influx of fluids evolved from the subducting slab. The geodynamic evolution from abyssal to forearc settings explains the nature of the oceanic lithosphere and the formation of serpentinization and melange.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Wenbin Ning, Timothy Kusky, Lu Wang, Junpeng Wang, Hao Deng, Bo Huang, Jiannan Meng, Ruizhi Wang, Die Hu, Yaying Peng, Zhiyuan Chen, Weikang Zhang
Summary: Ophiolitic melange in the Eastern Hebei Complex of North China Craton consists of Zunhua and Shangying ophiolitic melanges. The Zunhua ophiolitic melange formed in a forearc supra-subduction zone (SSZ) setting and records a Neoarchean subduction initiation and arc-continent collision event. The Shangying ophiolitic melange formed at a mid-ocean ridge (MOR) and contains subducted masses mixed and exhumed in a subduction channel. Both melanges provide insights into the tectonic evolution of the late Neoarchean.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geochemistry & Geophysics
Shengying Wu, Yuanyuan Xiao
Summary: The study reveals that the varying scales of veins in the (ultra-) high pressure metamorphic belt of Southwestern Tianshan orogen, China, reflect complex mass transfer processes in subduction zones, which are crucial for understanding arc magma characteristics.
Article
Multidisciplinary Sciences
Miriam Pena-Alvarez, Alberto Vitale Brovarone, Mary-Ellen Donnelly, Mengnan Wang, Philip Dalladay-Simpson, Ross Howie, Eugene Gregoryanz
Summary: The study demonstrates the high reactivity between diamond and graphite with hydrogen under conditions comparable to the Earth's upper mantle, resulting in the production of methane and ethane. This suggests that the interaction between deep hydrogen-rich fluids and reduced carbon minerals may be an efficient mechanism for producing abiotic hydrocarbons at the upper mantle.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Jenny S. Nakai, Anne F. Sheehan, Rachel E. Abercrombie, Donna Eberhart-Phillips
Summary: Using seismometers on the ocean floor and on land, seismic attenuation near the Hikurangi trench offshore New Zealand was investigated. The study revealed high attenuation above a recurring shallow slow-slip event and within the subducting Hikurangi Plateau. The presence of high temperatures, melt, fluids, and fractures in the region was inferred through the analysis of seismic attenuation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Mariano S. Arnaiz-Rodriguez, Yang Zhao, Ana K. Sanchez-Gamboa, Franck Audemard
Summary: The study using ambient noise tomography reveals unique lithospheric velocity structures in the Eastern Caribbean and Northern Venezuela, reflecting the geological history and tectonic evolution of the region. Variations in shear velocity profiles across different areas show differences from the global average, consistent with findings in other large igneous provinces.
Article
Geology
Erin Benson, James A. D. Connolly, Alan E. Boudreau
Summary: The crystallization of the Bushveld magma 2.06 billion years ago led to the generation of a large volume of country fluids, which rapidly penetrated the Bushveld rocks mainly through pipe-like channels in the footwall. Numerical modeling suggests that the metamorphic aureole reached its maximum extent when the Main Zone began to crystallize. The presence of diatremes and other features near diapiric upwellings implies that overpressured fluids generated during dehydration of footwall sediments contaminated the Main Zone magma.
INTERNATIONAL GEOLOGY REVIEW
(2021)
Article
Geochemistry & Geophysics
Alan R. Hastie, Sophie Cox, Andrew C. Kerr
Summary: The article discusses the formation and movement of the Caribbean plate, finding through rock studies on Saint John Island that the movement of the Caribbean region may have occurred in the Late Cretaceous, likely due to a subduction polarity reversal caused by collision with the Great Arc of the Caribbean.
Article
Geosciences, Multidisciplinary
F. Villares, I. F. Blanco-Quintero, P. S. Reyes, J. A. Proenza, R. Cartagena, C. Lazaro, A. Garcia-Casco
Summary: The Tampanchi Ultramafic-Mafic Complex (TUMC) in Ecuador is an oval-shaped intrusive body composed of wehrlite and olivine-hornblende clinopyroxenite, crosscut by hornblende gabbros, diorite, and granite. Geochemical and isotopic data indicate subduction-related parental liquids and a mantle source metasomatized by subducted crustal components. The emplacement and crystallization of the complex occurred at intermediate to shallow crust levels and around 75-76 million years ago. These findings support the existence of magmatic arc activity and double subduction at the continental margin of South America during the late Cretaceous.
Article
Geology
Lisard Torro, Joaquin A. Proenza, Julia Farre-de-Pablo, Carl Nelson, Manuel Jesus Roman-Alpiste, Antonio Garcia-Casco
Summary: This article discusses the uplift and unroofing of crust and mantle rock units in the Median Belt of the Dominican Republic, providing insight into the evolution of the northern edge of the Caribbean plate. It focuses on crustal rock units in the northeastern half of the Median Belt. The dating of metamorphic ferri-winchite and albite in metabasites of boninitic photolith from the Maimon Formation suggests a tectono-metamorphic event during the Upper Cretaceous.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Marc Campeny, Joaquin A. Proenza, Montgarri Castillo-Oliver, Lisard Torro, Cristina Villanova-de-Benavent, Joan Carles Melgarejo, Antonio O. Goncalves, Manuel J. Roman-Alpiste, Idael F. Blanco-Quintero, Xavier Llovet, Julia Farre-de-Pablo
Summary: The Hamutenha intrusion in Angola is a magmatic body consisting of two intrusive units. Through a study of this intrusion, it has been found that the magma interacted with tholeiitic magmas enriched in iron and titanium. Furthermore, dating of samples from the southern unit suggests that the intrusion occurred prior to the Paleoproterozoic Epupa Complex magmatism.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
Lidia Butjosa, Aitor Cambeses, Joaquin A. Proenza, Idael F. Blanco-Quintero, Samuele Agostini, Manuel Antonio Iturralde-Vinent, Antonio Garcia-Casco
Summary: Exotic blocks of massive antigorite-serpentinite in Cuba provide evidence of a deep-seated subduction channel. Two types of rocks, antigoritite and dolomite-bearing antigoritite, are present in the Villa Clara serpentinite-matrix melange. Fluid infiltration and multi-step metasomatic processes occurred, resulting in vein network formation, tremolitite precipitation, and blackwall formation. Thermodynamic modeling suggests the infiltration of deep-seated fluid during exhumation in the subduction channel. The compositions of the rocks indicate the involvement of fluids from the subducting plate, sediments, and altered oceanic crust.
Article
Geology
Haoyu Hu, Yamirka Rojas-Agramonte, Sandra Carrasquilla, Concepcion Lazaro, Iturralde Vinent, Antonio Garcia-Casco
Summary: The Mabujina Complex in south-central Cuba consists of metamorphosed volcanic and subvolcanic rocks. It has been debated whether the protoliths of the complex originated from the Caribbean volcanic arc or the Guerrero Arc of Mexico. New geochemical analyses suggest a Caribbean origin, but the complex cannot represent the root of the volcanic arc. Instead, it is proposed to be a fragment of the mid-Cretaceous Caribbean arc that was tectonically emplaced below the same arc due to arc segmentation and strike-slip trans-compression.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Lidia Butjosa, Aitor Cambeses, Joaquin A. Proenza, Samuele Agostini, Manuel Iturralde-Vinent, Luis Bernal-Rodriguez, Antonio Garcia-Casco
Summary: The Villa Clara serpentinite-matrix melange in central Cuba is part of the large ophiolitic belt of the Greater Antilles. The composition of ultramafic and mafic rocks allows classifying them into two main groups: MORB-like mantle typical of abyssal peridotite and refractory mantle-wedge forearc peridotites. These two groups indicate different melting processes and the influx of fluids evolved from the subducting slab. The geodynamic evolution from abyssal to forearc settings explains the nature of the oceanic lithosphere and the formation of serpentinization and melange.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geochemistry & Geophysics
J. Munoz-Montecinos, S. Angiboust, A. Garcia-Casco, T. Raimondo
Summary: We report the occurrence of vein networks precipitated and brecciated within the deep SST region under blueschist-facies conditions. These lawsonite-rich vein sets exhibit extensive evidence of brittle deformation and are spatially related to localized, finely milled (cataclastic) shear bands. The injection of several ultramafic-, mafic- and metasedimentary-derived fluid pulses accompanied the brittle deformation, indicating the importance of metamorphic veins as structural heterogeneities in triggering fluid-controlled brittle creep events.
Article
Multidisciplinary Sciences
Nicolas Riel, Joao C. Duarte, Jaime Almeida, Boris J. P. Kaus, Filipe Rosas, Yamirka Rojas-Agramonte, Anton Popov
Summary: Geodynamic models were used to simulate the evolution of the Caribbean region during the Cretaceous period, showing that the collision between the old Caribbean plateau and the Central America margin led to the formation of a new subduction zone in the Atlantic and triggered the formation of the Caribbean Large Igneous Province.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Diego Dominguez-Carretero, Jose Maria Gonzalez-Jimenez, Joaquin A. Proenza, Cristina Villanova-de-Benavent, Xavier Llovet, Antonio Garcia-Casco
Summary: Recent studies have shown that Au-bearing nanoparticles play a significant role in the formation of hydrothermal gold deposits. However, little is known about how these particles behave when exposed to hydrothermal fluids. In this study, we used high-resolution transmission electron microscopy to observe the melting sequence of Au-Ag nanoparticles in the presence of hydrothermal fluids. The interaction between Au-Ag nanoparticles and hydrothermal fluids at temperatures commonly found in hydrothermal gold deposits (400-500°C) may lead to melting and the formation of Au-Ag nanomelts, which has important implications for the remobilization and accumulation of noble metals during the formation of these deposits.
SCIENTIFIC REPORTS
(2023)
Article
Geology
Carlos A. Ramirez-Cardenas, Nuria Pujol-Sola, Joaquin A. Proenza, Marion Weber, Montgarri Castillo-Oliver, Monica Tobon, Antonio Garcia-Casco
Summary: Chromitite bodies in Colombia can be found in Medellin, Planeta Rica, and La Guajira. The composition, inclusions, and trace elements in these chromitites differ in the three locations. The chromitites in Medellin and Planeta Rica are high-Al, while the ones in La Guajira are high-Cr. The estimated melts associated with the chromitites suggest a back-arc setting for Medellin and Planeta Rica, and a fore-arc basin setting for La Guajira. Overall, the chromitites show similarities to those formed in supra-subduction zone settings. Rating: 8/10.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
I. F. Blanco-Quintero, A. Martin-Algarra, E. Santamaria-Perez, J. M. Gonzalez-Jimenez, A. Sanchez Navas, D. Benavente, J. C. Canaveras, A. Garcia-Casco
Summary: The sedimentary successions in southern Spain contain shallow-intrusive basic bodies of Mesozoic age, which have experienced low-grade Alpine metamorphism. The magmatic protoliths are subalkaline (tholeiitic) to alkaline basaltic magmas enriched in incompatible elements. The metamorphic minerals include magnesioriebeckite, actinolite, albite, stilpnomelane, phengite, and chlorite. The P-T conditions suggest a collisional (Barrovian) event and metamorphic correlation with the accreted passive margin of South Iberia.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
F. Villares, I. F. Blanco-Quintero, P. S. Reyes, C. Montes, D. Fuentes, A. Cardona, A. Garcia-Casco
Summary: The Peltetec ophiolitic belt in Ecuador's Cordillera Real reveals tectonic slivers of metamorphosed rocks. Two metamorphic events are proposed, with the first event related to ocean-floor metamorphism and the second event associated with the closure of a back-arc basin. The Peltetec fault/shear zone was responsible for displacement and mixing of blocks, but did not cause significant metamorphic recrystallization.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Antonio Sanchez-Navas, Agustin Martin-Algarra, Idael Blanco-Quintero, Antonio Garcia-Casco
Summary: This study investigates the medium and high grade graphitic metapelites in the Torrox Unit of the Western Mediterranean. The research reveals the presence of kyanite-andalusite-kyanite replacements and different types of coexisting garnet, indicating two distinct orogenic cycles. These findings provide valuable insights into the geological evolution of the area.
INTERNATIONAL GEOLOGY REVIEW
(2023)
