Article
Chemistry, Multidisciplinary
Changming Wang, Shicheng Rao, Kangxing Shi, Leon Bagas, Qi Chen, Jiaxuan Zhu, Hongyu Duan, Lijun Liu
Summary: This study reports a rare example of rutile deposits hosted within amphibolite-facies metamorphic rocks in the East Qinling Orogen, central China. The rutile deposit formed during lower amphibolite-facies metamorphism, and is distinct from other types of deposits elsewhere in the orogen. The source and formation temperature of the rutile were determined through Zr-in-rutile thermometer and Cr/Nb ratio analysis.
APPLIED SCIENCES-BASEL
(2021)
Article
Geosciences, Multidisciplinary
Pavla Stipska, Vit Peresty, Igor Soejono, Karel Schulmann, R. C. Andrew Kylander-Clark, Carmen Aguilar, Stephen Collett, Martin Racek, Jitka Mikova, Otgonbaatar Dorjsuren, Nikol Novotna
Summary: This study investigates the accretionary orogenic processes occurring at the periphery of the Rodinia supercontinent after its assembly. Metamorphic rocks in the Mongolia collage of the Central Asian Orogenic Belt are studied to fill the knowledge gap. It is found that the tectono-metamorphic evolution was mainly characterized by the late Proterozoic-early Cambrian cycle, but a Tonian age metamorphism is documented in the northern part of the Precambrian Baidrag block.
GEOSCIENCE FRONTIERS
(2023)
Article
Multidisciplinary Sciences
Yang Yang, Bin Xiong, Sanxi Peng, Siqin Liu, Hanbo Chen, Tianyu Zhang
Summary: This paper summarizes the mechanism and impact of magmatic rock intrusion into coal seams, introduces the characteristics and detection method of transient electromagnetic method (TEM), and analyzes its effectiveness in detecting the ranges of intruded coal seams.
Article
Geosciences, Multidisciplinary
Rucheng Zhang, Mingguo Zhai, Lei Zhao
Summary: Interpretations of high-grade terranes recording multiple episodes of metamorphism can be challenging. This study focuses on the Jiaobei terrane in the North China Craton, which has experienced both late Neoarchean metamorphism and late Paleoproterozoic tectonic thermal event. By analyzing metamorphic zircons, the researchers were able to determine the timing and features of each event, shedding light on the geological evolution of the Jiaobei terrane and the NCC.
PRECAMBRIAN RESEARCH
(2022)
Article
Geochemistry & Geophysics
Olga V. Rezvukhina, Sergey G. Skublov, Dmitriy I. Rezvukhin, Andrey V. Korsakov
Summary: This study highlights the utility of rutile in reconstructing the metamorphic evolution of ultrahigh-pressure rocks containing diamond, showcasing its distinct textural positions and geochemical characteristics in a diamondiferous kyanite gneiss. The findings suggest a metapelitic origin of rutile and provide temperature estimates using Zr-in-rutile geothermometer. Dating results indicate a younger age for rutile compared to peak metamorphic assemblages, showcasing cooling rates and exhumation processes. The study demonstrates rutile as a valuable tool in understanding the metamorphic evolution of diamond-bearing rocks.
Article
Geosciences, Multidisciplinary
Zhen M. G. Li, Yi-Chao Chen, Qian W. L. Zhang, Jia-Hui Liu, Chun-Ming Wu
Summary: This study provides new insights on the tectonic affinity of the Kang-Dian region in the Neoproterozoic from a metamorphic perspective. The long duration of the metamorphic event in the Kang-Dian region, over 100 Ma, suggests a long-lived orogenic process rather than a super-plume scenario. The metamorphic P-T conditions indicate an extensive compressional environment with prevailing deviatoric stress, possibly a subduction zone.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Esmail Moradian, Nahid Shabanian, Ali Reza Davoudian, Yunpeng Dong, John M. Cottle
Summary: The Amphibolitic rocks of the Tutak Metamorphic Complex have a U-Pb age of 56.08+/- 1.13 Ma and peak temperatures of 616 to 674 degrees Celsius. Geochemically, they are likely derived from sub-alkaline basaltic magma in a mantle source with enriched Nb and Sr depletion.
JOURNAL OF ASIAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
Yuanyuan Zhang, Chunjing Wei, Hang Chu
Summary: By studying garnet mica schists in the Hongqiyingzi Complex on the northern margin of the North China Craton, researchers have identified four phases of metamorphism, connecting with regional geological events including Paleoproterozoic orogenic belt tectonic changes, Late Paleozoic extension, and Early Mesozoic collision. The study provides insights into the complex tectonic evolution of the North China Craton and surrounding regions.
Article
Geosciences, Multidisciplinary
Ding Wu, Chunjing Wei
Summary: The controversial tectonic evolution of the North China Craton in the Neoarchean and Paleoproterozoic eras has been clarified using metamorphic P-T paths, revealing evidence of unique vertical tectonic regimes in the late Neoarchean and crustal-thickening orogeny in the late Paleoproterozoic.
PRECAMBRIAN RESEARCH
(2021)
Article
Geochemistry & Geophysics
Min Ji, Xiao-Ying Gao, Yi-Xiang Chen, Cong Tu, Guo-Chao Sun, Bing Gong, Xiang -Ping Zha, Yong-Fei Zheng
Summary: This paper presents new results from comprehensive analyses of tourmaline in the Himalayan orogen, providing insights into the influence of dehydration metamorphism and anatectic metamorphism in collisional orogens.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Zhongwu Lan
Summary: Authigenic xenotime and monazite are common in siliciclastic sedimentary rocks and can be used to determine the depositional age. Their small size and complex chemical compositions require advanced imaging and dating techniques. Integrated petrographic and geochemical studies can help distinguish their different sources.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Xiahui Zhang, Yuping Su, Jianping Zheng, Penglei Liu, William L. Griffin, Xianquan Ping, Jian Wang, Liang Zhou
Summary: The Trans-North China Orogen (TNCO) is a major Paleoproterozoic collisional orogen within the North China Craton (NCC). A study of high-grade metamorphic rocks within the TNCO reveals key information about the growth of continental crust. The Hengshan Complex in the TNCO records two episodes of crustal growth at around 2.8-2.7 Ga and 2.1-2.0 Ga, reflecting the final cratonization of the NCC.
Article
Geosciences, Multidisciplinary
K. S. Anoop, Y. Anilkumar, M. Santosh, Bing Yu, K. Delna Joy, K. Kavyanjali, Ajana Sathyan, Anjana Mathew, K. S. Sajinkumar
Summary: This study reports the presence of a layered intrusion at the northern margin of the Coorg Block and investigates its magmatic and metamorphic evolution, as well as the collisional event between the Coorg Block and the Dharwar Craton.
Article
Geosciences, Multidisciplinary
Joseph Martial Akame, Bernhard Schulz, Sebastien Owona, Vinciane Debaille
Summary: The study used electron microprobe (EPMA) technology and monazite age data to analyze the magmatic and tectonic events in the rocks of Sangmelima, Cameroon, refining the geological evolution of the NW Congo Craton. Through age data, it was found that the Ntem Complex experienced significant magmatic events between approximately 2950 and 2850 Ma, followed by two major tectonothermal events.
JOURNAL OF AFRICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Han Wang, Xu-Ping Li, Juergen Reinhardt, Fan-Mei Kong, Hans-Peter Schertl, Guang-Ming Sun
Summary: The Bushmanland Domain in the western Namaqua-Natal Metamorphic Province includes Paleoproterozoic to Mesoproterozoic intrusives and metamorphosed volcano-sedimentary supracrustal rocks. High-grade metamorphism is prevalent, with evidence of peak conditions reaching transitional to ultrahigh temperatures. The zircon and monazite geochronology reveals two distinct age groups, indicating both an older metamorphic cycle predating the established 1040-1020 Ma Namaquan cycle, and a Late Mesoproterozoic group confirming the similar to 1040-1020 Ma metamorphic age associated with the Namaquan orogeny.
PRECAMBRIAN RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Carmen I. Martinez Dopico, Paul Y. J. Antonio, Augusto E. Rapalini, Monica G. Lopez de Luchi, Carolina Grillo Vidal
Summary: This study conducted a paleomagnetic analysis on Ordovician granitoids in the North Patagonian Massif to investigate the relationship between Patagonia and Gondwana during the Early Paleozoic. The results suggest that NPM was located close to the South American margin of Gondwana and separated from other cratons by the Sierra Grande Sea since at least late Ordovician times, supporting a para-autochthonous origin for NPM. Previous hypotheses suggesting a connection between NPM and the TransAntarctic Mountains in the late Ordovician are unlikely according to new data, indicating an allochthonous NPM near the Kalahari craton.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
Monica G. Lopez de Luchi, Carmen I. Martinez Dopico, Augusto E. Rapalini
Summary: This study presents the geochronologically constrained igneous stratigraphy of the Permian to Early Triassic magmatism in the Nahuel Niyeu and Yaminue areas of northern Patagonia. Different types of igneous rocks were identified, with varying compositions and structural characteristics indicating different sources and emplacement processes.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Geosciences, Multidisciplinary
P. Y. J. Antonio, M. S. D'Agrella-Filho, A. Nedelec, M. Poujol, C. Sanchez, E. L. Dantas, R. Dall'Agnol, M. F. B. Teixeira, A. Proietti, C. Martinez Dopico, D. C. Oliveira, F. F. Silva, B. Marangoanha, R. I. F. Trindade
Summary: The Uatuma event in the Amazonia craton during the early Paleoproterozoic period is studied through new paleomagnetic and U-Pb apatite age data from dykes in the Carajas Province. The presence of two primary characteristic remanent magnetizations (ChRMs) and the identification of two grand mean poles from different dykes provide insights into the paleomagnetic history and plate movements during that period. The discrepancies between the poles suggest high plate velocities and potential true polar wander as explanations for the observed geological and paleomagnetic data.
PRECAMBRIAN RESEARCH
(2021)
Review
Geochemistry & Geophysics
Bernhard Schulz
Summary: The study reveals the polymetamorphic evolution of the Alpine basement through geothermobarometry and EPMA analysis. Different regions show different sequences of ancient orogenies, with variations in pressure and temperature changes. The results highlight the evolutionary history of polymetamorphism at different scales.
Article
Geosciences, Multidisciplinary
Piotr Marian Wojtulek, Bernhard Schulz, Reiner Klemd, Grzegorz Gil, Michal Dajek, Katarzyna Delura
Summary: The Variscan Central-Sudetic Ophiolites (CSO) are located in the Sudetes and exhibit similarities in rock composition and geochemical characteristics with other Variscan ophiolites. The CSO likely formed in a mature back-arc basin setting and lack depleted and contaminated sediments.
Article
Engineering, Chemical
Andrea C. Guhl, Sabine Gilbricht, Carsten Paetzold, Bernhard Schulz, Martin Bertau
Summary: Understanding the associations of phosphate compounds in sewage sludge ash is crucial for efficient recycling and recovery of phosphorus. Automated mineralogy systems provide a deeper insight into the phase associations of phosphate-bearing phases in ash. Failing to comprehend these associations may lead to inefficient processes and hinder resource recovery efforts.
MINERALS ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Andrea C. Guhl, Sandra Pavon, Bernhard Schulz, Martin Bertau
Summary: This study investigates the application of automated SEM investigations for elemental composition and particle size analysis, comparing ICP-OES, XRF, and SEM-EDX techniques in the study of sewage sludge ash (SSA) samples, highlighting the strengths and weaknesses of each method and the variation in material characteristics. The results show discrepancies in the detection of phosphate phases and accompanying elements using different techniques, indicating challenges in traditional analysis methods for fine-grained and amorphous materials like ash.
Article
Geosciences, Multidisciplinary
Sebastien Owona, Bernhard Schulz, Dieudonne Minyem, Lothar Ratschbacher, Boris Chako Tchamabe, Jean Bosco Olinga, Joseph Mvondo Ondoa, Georges Emmanuel Ekodeck
Summary: By combining geochemical, petrologic, and geo-thermobarometric data, the geodynamic evolution of the Paleoproterozoic Nyong complex in southwestern Cameroon was constrained. The results indicate the occurrence of partial melting in the mantle sources and metamorphic recrystallization under decompression. The research also highlights distinct burial-exhumation paths for the Nyong complex rocks, showcasing a clockwise pressure-temperature evolution typical for a collisional setting.
JOURNAL OF AFRICAN EARTH SCIENCES
(2022)
Editorial Material
Geosciences, Multidisciplinary
Hugo Moreira, Mathias Schannor, Kathryn Cutts, Nick M. W. Roberts
GEOSCIENCE FRONTIERS
(2022)
Editorial Material
Geosciences, Multidisciplinary
Kathryn Cutts, Mathias Schannor, Hugo Moreira, Nick M. W. Roberts
PRECAMBRIAN RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Talitta Nunes Manoel, Monica Heilbron, Kathryn Cutts, Ivo Dussin, Gloria Marins, Jailane, Marcela Lobato, Claudio De Morisson Valeriano, Henrique Bruno
Summary: This study presents new data on the metabasic rocks interlayered in the Andrelandia basin, including geological mapping, geochemistry, isotopes, and zircon geochronology. The results reveal the geological characteristics and tectonic evolution of the metabasic rocks, indicating similarities with the Aracuai orogen and the Aracuai-Ribeira Orogenic System.
PRECAMBRIAN RESEARCH
(2022)
Article
Geosciences, Multidisciplinary
Talitta Nunes Manoel, Kathryn Cutts, Monica Heilbron, George Luvizotto, Henrique Bruno, Cristiano Lana, Ivo Dussin, Claudio de Morrison Valeriano
Summary: The study focuses on the Juiz de Fora Complex (JFC) in southeastern Brazil, which is a basement unit connected to the Occidental Terrane, Ribeira Belt. Petrological, geochemical, and isotopic analyses were conducted on mafic garnet-granulites from the JFC to determine the collisional event and protolith formation. The results provide important insights into the timing, P-T conditions, and geological history of the JFC, indicating a complex evolution involving multiple collisional episodes.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Editorial Material
Geosciences, Multidisciplinary
Jonathan M. Pownall, Kathryn A. Cutts
Summary: Jon Pownall and Kathryn Cutts delve into the past and future implications of garnet as a valuable tool for measuring pressure, temperature, and time.
Article
Geosciences, Multidisciplinary
David Dominguez-Santos, Daniel Valderrama, Ahmet Utku Yazgan
Summary: This document presents a study comparing the spectra of large-magnitude seismic records in Chile between 2012 and 2022 with the design spectra of NCh433 and D. S 61. The aim is to determine if Chile's seismic-resistant regulations are updated to the existing reality and propose new design spectra that better represent the seismic activity in Chile during the last decade.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Prabhu Palanisamy, Vivek Sivakumar, Priya Velusamy, Logesh Natarajan
Summary: Shoreline changes in the southern coast of Rio de Janeiro, Brazil, were analyzed from 1986 to 2018. The study found that both natural and human factors significantly impact shoreline changes. The findings provided important insights into predicting future shoreline positions and identifying vulnerable regions. Additionally, human activities were found to influence shoreline change models, emphasizing the need for effective management strategies to protect ecosystems and communities.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Irina Salgado Bernal, Periyasamy Sivalingam, Armando Martinez Sardina, Michel Manduca Artiles, Maria E. Carballo Valdes, John Pote
Summary: This study investigated the presence of 15 toxic metals in surface sediment in a tropical river ecosystem in Cuba. The results showed that the sediments had higher concentrations of four metals compared to Cuban norms. Various contamination indices were calculated, and correlations analysis revealed the main sources of contamination. The study provides important information for the management of the river and emphasizes the need for metal pollution control and monitoring.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Camila Morgan, Eduardo Morgado, Miguel-Angel Parada, Raimundo Brahm, Francisca Mallea-Lillo
Summary: Lanin volcano is a composite volcano in the Andes, which has erupted lava flows with different compositions. The volcano's magma reservoir contains a crystal mush, and the pre-eruptive conditions include temperature, pressure, and oxygen fugacity. Fractional crystallisation has led to the evolution of the magma with different compositions.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)
Article
Geosciences, Multidisciplinary
Benjamin Idini, Sergio Ruiz, Jean-Paul Ampuero, Felipe Leyton, Efrain Rivera
Summary: This study investigates the role of wedge integrity on the frequency content of strong ground motion produced by subduction earthquakes in Northern Chile. The results show that the frequency characteristics of seismic waves vary with hypocentral distance, indicating lateral variations in anelastic attenuation due to the heterogeneous tectonic structure.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2024)