Article
Geosciences, Multidisciplinary
Dillon A. Brown, Martin Hand, Laura J. Morrissey
Summary: The study provides evidence of high pressure metamorphism along the eastern margin of Tasmania, with zircon analysis indicating eclogite formation during the Middle Cambrian and older Mesoproterozoic ages. Mineral compositions, element concentrations, and temperature data reveal the growth history and geological evolution of the eclogites.
Article
Geosciences, Multidisciplinary
Fabricio A. Caxito, Leo Afraneo Hartmann, Monica Heilbron, Antonio Carlos Pedrosa-Soares, Henrique Bruno, Miguel A. S. Basei, Farid Chemale
Summary: By analyzing data from various fields, it has been concluded that the South Atlantic Brasiliano Orogenic System went through a Wilson cycle involving different stages such as rift, drift, subduction, collision, and collapse. The evidence from petrographic, isotopic, and geophysical data reveals the complex evolution of the South Atlantic Brasiliano Orogenic System with distinct components of the Wilson cycle.
PRECAMBRIAN RESEARCH
(2022)
Article
Geology
Jesus Munoz-Montecinos, Aitor Cambeses, Samuel Angiboust
Summary: This study investigates the geology of Infiernillo beach and Punta de Lobos in Pichilemu, Chile, and finds that they represent the same geological unit formed by the interaction between continental sediments and oceanic crust during subduction at high pressure-low temperature conditions. The findings have important implications for understanding the mechanism of earthquakes.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geology
Aliba Ao
Summary: This article reports the tectonic slices in the northern part of the NOC, discusses the metamorphic P-T conditions and paths of the garnet epidote amphibole schist and epidote blueschist, and highlights the role of these tectonic slices in the region.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Yinbiao Peng, Shengyao Yu, Zhiqing Lai, Sanzhong Li, Yongjiang Liu, Chuanzhi Li, Lili Qi, Zhenzhu Jian
Summary: This study reports the discovery of eclogites within the Amdo microcontinent, and provides a detailed analysis of their metamorphic evolution. The eclogites show characteristics and geochemical features that suggest formation in a back-arc basin tectonic setting. Zircon U-Pb dating yields a metamorphic age of 190 Ma for the eclogites. The findings of this study reveal important information about the tectonic evolution of Central Tibet before the collision of the Qiangtang-Lhasa terrane.
GEOLOGICAL JOURNAL
(2022)
Article
Geology
Regiane Andrade Fumes, George Luiz Luvizotto, Renato Moraes, Pierre Lanari, Claudio de Morisson Valeriano, Thomas Zack, Mark J. Caddick, Luiz Sergio Amarante Simoes
Summary: By using a combination of in situ techniques, the study assesses the P-T-t path of high-pressure granulites from the Southern Brasilia Orogen. The results provide insights into the crystallization conditions and metamorphic history, indicating peak pressure occurred around 635 Ma with later retrograde conditions and cooling stages.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geology
Samantha March, Martin Hand, Renee Tamblyn, Bruna B. Carvalho, Chris Clark
Summary: This study presents data from garnet-kyanite metapelites in different regions, Ulsteinvik and Fjertoft, in Norway. The research investigates their origin and evolutionary history using various methods. The results indicate that the metapelites from these two regions have different geological histories and may have formed in different tectonic settings.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Yongsheng Gai, Liang Liu, Guowei Zhang, Chao Wang, Xiaoying Liao, Lei Kang, Wenqiang Yang, Tuo Ma
Summary: This study focuses on the felsic gneiss in the Danshuiquan locality of the South Altyn HP-UHP belt, which has undergone a similar metamorphic evolution to the Yinggelisayi HP-UHP rocks in the eastern segment of the belt. Previous estimates of peak metamorphic conditions for felsic rocks in UHP metamorphic terranes were underestimated.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Geology
Wangchao Li, Changqing Yin, Zeming Zhang, Peter A. Cawood, Shun Li, Jian Zhang, Huixia Ding, Jiahui Qian, Yanling Zhang
Summary: This study reports the discovery of poly-cyclic high-pressure low-temperature rocks in the easternmost Indus-Yarlung suture zone, which were formed during the subduction of Neo-Tethyan oceanic lithosphere. The research includes petrology, mineral composition analysis, and P-T pseudosection modeling. The findings reveal a complex metamorphic history involving multiple low-temperature eclogite facies events.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geology
Shah Wali Faryad, Josef Jezek, Jan Kulhanek
Summary: This study presents the petrological observations and diffusion modelling results of garnet from high-pressure to ultrahigh-pressure metamorphic rocks in the Western Gneiss Region. The results reveal the evolution of Pre-Caledonian granulite facies and Caledonian eclogite facies metamorphic events in these rocks, with preservation of compositional gradients and relaxation processes. Calculations indicate a pressure of up to 2.6 GPa and a temperature of 650 degrees C during the eclogite facies event. The study also provides insights into the cooling rate and exhumation rate of the rocks during their geological history.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Toshiaki Tsunogae, Sam Uthup, Mzee Wandembo Nyirongo, Kazuki Takahashi, Md Sazzadur Rahman, Qian Liu, Yusuke Takamura, Yukiyasu Tsutsumi
Summary: The southern part of the Malawi Basement Complex provides insights into the complex history of collisions between ancient cratons and magmatic arcs. Geochemical and petrological data suggest a series of metamorphic and magmatic events, with remnants of the Stenian-Tonian magmatic arc being metamorphosed around 560 Ma. This region may correspond to a suture zone formed by the latest Neoproterozoic collision between the Kalahari and Congo Cratons.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
D. Rojo, M. Calderon, F. Herve, J. Diaz, P. Quezada, R. Suarez, M. C. Ghiglione, F. Fuentes, T. Theye, J. Cataldo, J. Sandoval, T. Viefhaus
Summary: The metamorphosed mafic-ultramafic sequences in the Patagonian Andes provide key insights into the late Paleozoic tectonic evolution of the southwestern margin of Gondwana. These rocks likely originated in a retreating convergent margin, representing components of oceanic crust, and were affected by magmatic intrusions and thermal metamorphism during the mid-Carboniferous.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Yinbiao Peng, Shengyao Yu, Jianxin Zhang, Yunshuai Li, Sanzhong Li, Pei Lv
Summary: This study focuses on a Paleozoic continental arc section on the northern margin of the Qilian Block, revealing two significant episodes of continental crust growth and providing important insights into continent building processes.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2022)
Article
Geosciences, Multidisciplinary
Andreas Auer, Atsushi Kamei, Daisuke Endo
Summary: A study on the major explosive eruptions of Sanbe volcano in SW Japan reveals that the rate of magma flux into the Trans-Crustal Magmatic System (TCMS) plays a significant role in determining the type and style of subsequent eruptions. The erupted products can be divided into two distinct groups, characterized by different composition and petrographic features. The study also suggests that the initial high melt-production rate led to the formation of highly evolved K-rich magmas, while the decrease in magma production rate resulted in smaller magnitude eruptions of conventional adakitic magmatism.
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
Geochemistry & Geophysics
Julia Farre-de-Pablo, Joaquin A. Proenza, Jose Maria Gonzalez-Jimenez, Thomas Aiglsperger, Lisard Torro, Cristina Domenech, Antonio Garcia-Casco
Summary: Platinum-group elements occur in ophiolitic chromitite in the Dominican Republic as platinum-group minerals in spatial association with hydrothermal minerals. The formation of PGMs is believed to be influenced by both magmatic and hydrothermal processes, with different types of PGMs identified in the chromitite samples. The crystallization temperature of uvarovite and chromian clinochlore suggests a hydrothermal alteration temperature range of 150-350 degrees Celsius, providing insights into the genesis of hydrothermal PGE mineralizations.
MINERALIUM DEPOSITA
(2022)
Article
Geochemistry & Geophysics
George L. Guice, Joana Reis Magalhaes, Marco Aurelio Piacentini Pinheiro, Raianny Carolini Ramos Ferreira, Vinicius Tieppo Meira, Paola Melo-Silva, Michael R. Ackerson
Summary: The Morro do Onca suite in the southern Sao Francisco Craton, Brazil, is a package of ultramafic rocks with a complex magmatic and metamorphic history. It is classified as Weltevreden-type komatiites and shows significant variation in the Al/Ti ratio, overlapping with both Munro- and Weltevreden-type komatiites. The presence of Mesoarchean komatiites suggests that the precursor lithosphere was continuous during this era.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2022)
Review
Geochemistry & Geophysics
H. Y. Hu, R. J. Stern, Y. Rojas-Agramonte, A. Garcia-Casco
Summary: This study compiled geochronologic and geochemical data of igneous and metamorphic rocks in the Greater Antilles islands to investigate the formation and evolution of the Greater Antilles Arc (GAA). The results indicate that the GAA started in the Early Cretaceous and ceased in the Paleogene, and it was influenced by the Caribbean Large Igneous Province.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2022)
Editorial Material
Geology
Nuria Pujol-Sola, Joaquin A. Proenza, Jose Maria Gonzalez-Jimenez, Fernando Gervilla, Joan Carles Melgarejo, Claudio Marchesi, Antonio Garcia-Casco
ORE GEOLOGY REVIEWS
(2022)
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
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
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)
Article
Geochemistry & Geophysics
Huichuan Liu, Alan R. Hastie, Chiara Maria Petrone
Summary: This study conducted isotope analyses on two ocean island basalt (OIB)-associated enriched mafic intrusions in the Yunnan-Burma region, and found that these rocks may have originated from the subduction recycling of marine sediments and altered oceanic crust.
Article
Geochemistry & Geophysics
L. Notini, M. Scambelluri, A. Tommasi, A. Zanetti, F. Ferri, A. Rodriguez-Vargas, E. Rampone
Summary: This study provides important petrologic information on the mantle wedge above an active subduction zone in Southern Colombia. The researchers analyzed a unique suite of rock samples and found evidence of hydration, metasomatism, and partial melting in the mantle wedge. They also observed variations in lithotypes, textures, and mineral abundance, indicating different interactions with melts and fluids. This study sheds light on the complex petrological processes occurring in the mantle wedge and contributes to our understanding of subduction zone dynamics.
Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Jia-Min Wang, Kyle Patrick Larson, Jin-Jiang Zhang, Liang Zhao, Fu-Yuan Wu
Summary: The role of collisional belts in the global carbon budget is controversial. This study reveals a previously unrecognized carbon source in the collisional orogen of the Himalayas, where metamorphism of carbonate-bearing rocks in the hanging wall resulted in significant CO2 degassing.
Article
Geochemistry & Geophysics
Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame
Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.
Article
Geochemistry & Geophysics
Xiguang Huang, Jun He, Jingxin Zhao, Jingzhao Dou, Weiyong Li, Aimin Hu, Ge Liu, Yiru Ji, Fukun Chen, Shuangqing Li
Summary: This study investigates the zircon ages and whole-rock geochemical data of Late Paleozoic magmatic rocks in the Western Yunnan Tethyan belt to identify the origin and mechanism of mantle melting. The results suggest that these magmatic rocks may originate from different mantle domains that were metasomatized by slab-derived fluids and sediment-derived melts.