Article
Geochemistry & Geophysics
Stefano Caruso, Marco L. Fiorentini, David C. Champion, Yongjun Lu, Yuichiro Ueno, Robert H. Smithies
Summary: The identification of fluid reservoirs in Neoarchean orogenic gold deposits is crucial for understanding the sulfur cycle and improving exploration strategies. The sulfur isotope composition of granitoids in the Archean Yilgarn Craton of Western Australia indicates the presence of sulfur reservoirs at deep crustal levels, which coincide with terrane subdivision and reflect crustal evolution and lithospheric architecture.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Article
Geology
Chao Li, Jun Yan
Summary: This study focuses on late Mesozoic magmatic rocks from the Bengbu uplift and the Jiaobei uplift in the southeastern margin of the North China Craton. The intensity of decratonic gold mineralization is controlled by magmatic source composition, intrinsic magmatic variables, and lithospheric architecture. The data suggest that plate subduction plays a crucial role in the recycling of ore-forming nutrients and the triggering of gold mineralization.
INTERNATIONAL GEOLOGY REVIEW
(2023)
Article
Geosciences, Multidisciplinary
Ranee Joshi, Kavitha Madaiah, Mark Jessell, Mark Lindsay, Guillaume Pirot
Summary: A large amount of legacy drilling data is available but cannot be used directly due to unstructured formats and subjective nature, which can be standardized and classified using the dh2loop open-source Python library. The use of thesauri and fuzzy string matching helps address the variability in lithological descriptions and bridge the gap between legacy data utilization and 3D geological modelling.
GEOSCIENTIFIC MODEL DEVELOPMENT
(2021)
Article
Geochemistry & Geophysics
Dennis Sugiono, Crystal LaFlamme, Nicolas Thebaud, Laure Martin, Dany Savard, Marco Fiorentini
Summary: The mechanism of gold precipitation in orogenic gold deposits is still unclear. This study analyzes the trace element composition and sulfur isotopes of gold-bearing pyrite growth zones to understand the formation process of gold-rich pyrite. The results suggest that gold enrichment mainly occurs in a fluid undergoing phase separation fluctuations, and the fault-valve process plays a significant control role in gold precipitation.
Article
Geology
Yushan Yang, Yuanyuan Li, Xiaohong Deng, Tingjie Yan
Summary: The eastern block of the North China Craton hosts numerous early Cretaceous gold deposits, with the largest gold producing district in China being the Jiaodong Peninsula. Gravity and magnetic signatures in the region predict concealed lithological contacts between Mesozoic granites and Precambrian metamorphic rocks, controlling the gold mineralization in the Liaodong and Jiaodong areas. Additional exploration is warranted in the underexplored Qingchengzi ore field in the Liaodong Peninsula to further investigate the potential for large gold deposits.
ORE GEOLOGY REVIEWS
(2021)
Article
Multidisciplinary Sciences
Laura Petrella, Nicolas Thebaud, Denis Fougerouse, Brian Tattitch, Laure Martin, Stephen Turner, Alexandra Suvorova, Sarah Gain
Summary: This study presents new insights into the formation of gold-rich veins and highlights the essential contribution of metal nanoparticles associated with silica and carbon in efficient gold deposition. The formation of metal nanoparticles is crucial for the formation of high-grade gold deposits.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Meghan S. Miller, Robert Pickle, Ruth Murdie, Huaiyu Yuan, Trevor I. Allen, Klaus Gessner, Brain L. N. Kennett, Justin Whitney
Summary: The geological structure of southwest Australia has a complex record of cratonization and continental breakup. Despite being a stable continental craton, it has been the most seismically active region in continental Australia in recent decades. The Southwest Australia Seismic Network (SWAN) aims to record local earthquakes for seismic hazard applications and improve the understanding of seismic structure.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Lin Li, Chao Li, Qing Li, Mao-Wen Yuan, Ju-Quan Zhang, Sheng-Rong Li, M. Santosh, Jun-Feng Shen, Hua-Feng Zhang
Summary: The North China Craton hosts typical decratonic gold deposits, which are formed under various geological and tectonic conditions. The presence of different rock types, mineral assemblages, and alteration zones suggests a complex ore formation process.
EARTH-SCIENCE REVIEWS
(2022)
Article
Geochemistry & Geophysics
Mimi Chen, Ian H. Campbell
Summary: This study analyzed pyrite corona nodules from the 2.7 billion-year-old Kapai Slate in Western Australia, revealing distinct compositional and isotopic zoning between cores and mantles. The cores are enriched in highly compatible trace elements, while the mantles are enriched in incompatible elements. Linear correlations were found between the compatible and incompatible elements, with isotopic zonation also observed. This research provides new constraints on the partitioning of trace elements between Archean ocean water and sedimentary pyrite.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Geology
Chao Li, Jun Yan
Summary: In addition to granite porphyries, many mafic dikes are closely associated with ore bodies in the study area. Detailed petrogenesis studies on these mafic dikes have not been conducted, but comprehensive geochemical data and isotopic analyses reveal their origin from an enriched mantle affected by subduction processes. The mafic dikes, with pronounced LREE enrichment and HREE depletions, exhibit characteristics of highly oxidized and hydrated magmas, suggesting favorable conditions for gold transportation.
ORE GEOLOGY REVIEWS
(2021)
Review
Geochemistry & Geophysics
Stanislav Ulrich, Steffen Hageman, Juliana Charao Marques, Frederico Lana A. R. Figueiredo, Joao E. F. Ramires, Jose Carlos Frantz, Klaus Petersen
Summary: The study discusses the main controls on mineralization in the Crixas gold deposit, analyzing lithostratigraphy, geochronology, mineralogy, alteration, fluid chemistry, and structural data. It reveals that gold mineralization at Crixas represents orogenic upper mesothermal to lower hypothermal types and is developed within an overturned Paleoproterozoic stratigraphic sequence.
Article
Geosciences, Multidisciplinary
Eunjoo Choi, Marco L. Fiorentini, Andrea Giuliani, Stephen F. Foley, Roland Maas, Stuart Graham
Summary: The study revealed that the Proterozoic alkaline ultramafic rocks in the Yilgarn Craton and its northern margin have different origins, indicating varying mantle sources; the rocks from the Eastern Goldfields Superterrane and Norseman share similar compositions, possibly originating from a common mantle source; while the orangeites in the Earaheedy Basin show signatures of subduction-related magmas, suggesting an ancient lithospheric mantle source.
Article
Geochemistry & Geophysics
Andreas Zametzer, Christopher L. Kirkland, Milo Barham, Nicholas E. Timms, Michael I. H. Hartnady, Aaron J. Cavosie, Bryant Ware, William D. A. Rickard, Timmons Erickson
Summary: Hypervelocity impacts have had a significant impact on the evolution of Earth's continental crust. The use of accessory minerals and rock-forming minerals like zircon and quartz, respectively, has been common in dating impact events and measuring shock-induced deformation. However, feldspar group minerals, which are major components of most crustal rocks, have not been extensively utilized in documenting impact-induced deformation and alteration. This study explores the potential of using Pb isotope analysis in alkali feldspar to identify impact-related modifications and estimate their timing.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Geochemistry & Geophysics
Andreas Zametzer, Christopher L. Kirkland, Milo Barham, R. Hugh Smithies, David L. Huston, David C. Champion
Summary: Various geological processes affecting Earth's crust can be identified using isotopic tracers in rocks and minerals. This study focuses on the use of Pb isotopic data to gain insights into specific geological processes occurring throughout the crustal column. The results reveal spatial trends and diversity in Pb signatures, providing valuable information on the formation of different chemical process groups.
Review
Geosciences, Multidisciplinary
Rixiang Zhu, Weidong Sun
Summary: The Circum-Pacific subduction zone is a renowned gold metallogenic domain in the world, with important gold metallogenic provinces such as the North China Craton and Nevada. Formation of ore-forming fluids is related to the destruction of cratons and involves hydrated hydrous minerals like Phases A to E releasing sulfur-rich fluids. The destabilization of a water- and gold-rich weak layer during craton destruction accelerates the release of gold-bearing fluids for explosive gold mineralization.
SCIENCE CHINA-EARTH SCIENCES
(2021)
Article
Geochemistry & Geophysics
Shi-Min Li, Qing Wang, Di-Cheng Zhu, Peter A. Cawood, Robert J. Stern, Roberto Weinberg, Zhidan Zhao, Xuan-Xue Mo
Article
Geosciences, Multidisciplinary
Charles Verdel, Matthew J. Campbell, Charlotte M. Allen
Summary: Zircon Hafnium (Hf) isotope composition integrated with U-Pb age provides a long-term record of crust evolution, while trace element compositions of zircon are mainly used in local or regional petrological studies. This study presents new detrital zircon U-Pb ages and trace element compositions from the Centralian Superbasin in Australia, offering insights into the Proterozoic history of Australia and broader interpretations of plate-tectonic processes in other regions.
Article
Geochemistry & Geophysics
Anindita Samsu, Alexander R. Cruden, Nicolas E. Molnar, Roberto F. Weinberg
Summary: The study shows that pre-existing penetrative basement fabrics can influence new faults in cover rocks during rifting through a subtle form of inheritance, impacting the fault network architecture in rift basins significantly. Additionally, experiments demonstrate that basement anisotropies play a role in determining fault orientation and spacing during rift formation.
Article
Geology
Lucas R. Tesser, Carlos E. Ganade, Roberto F. Weinberg, Miguel A. S. Basei, Renato Moraes, Laisa A. Batista
Summary: This study reports the first identification of sapphirine-bearing ultrahigh-temperature metamorphic rocks in the Borborema Province in NE Brazil, providing insights into their formation mechanisms and timing. The results suggest a correlation between high geothermal gradients, continental rifting events, and the opening of oceanic basins, as well as their association with the formation of the Columbia supercontinent.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Ben S. Knight, Fabio A. Capitanio, Roberto F. Weinberg
Summary: The relationship between shear stress at the base of the crust and the yield stress affects the evolution of viscoplastic orogenic wedges, with increasing crustal thickness leading to an increase in velocity required to transition from viscous-to-viscoplastic and then to plastic-dominated wedges.
Article
Geochemistry & Geophysics
Lingzhu Kong, Yingde Jiang, Karel Schulmann, Jian Zhang, Roberto F. Weinberg, Min Sun, Sheng Wang, Tan Shu, Jun Ning
Summary: The structural and metamorphic effects of a Devonian extension-shortening cycle in the NW Chinese Altai were investigated. The study revealed the presence of a sub-horizontal metamorphic fabric (S1) and identified the age and timing of the extension and shortening phases. The findings suggest that the cycles of extension and contraction in the Altai range could result from alternating retreating and advancing subduction.
Article
Geochemistry & Geophysics
Uchitha N. Arachchige, Alexander R. Cruden, Roberto Weinberg, Anja Slim, Jonas Kopping
Summary: This study investigates the formation of saucer-shaped sills in the upper crust and finds that their formation is influenced by the ratio of elastic moduli between the host material layers, the ratio of sill radius to overburden depth, and the visco-plastic instability of the host material. The experiments successfully simulate the complexity of natural saucer-shaped sills and their marginal segmentation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Roberto F. Weinberg, Jean-Francois Moyen, Jian-Kang Yi, Di-Cheng Zhu, Oliver Nebel, Shaorong Chen, Qing Wang
Summary: Thermo-chemical modeling and chemical data indicate that the formation of arc melts involves re-melting of older intrusions triggered by mantle-derived melts, followed by magma mixing. This paper studies a case where the compositional and thermal record of zircons preserved in a diorite dyke swarm provides insights into these processes. The findings suggest that magma mixing and re-crystallization can explain the complex chemistry of arc magmatic rocks.
JOURNAL OF PETROLOGY
(2023)
Article
Multidisciplinary Sciences
Di-Cheng Zhu, Qing Wang, Roberto F. Weinberg, Peter A. Cawood, Sun-Lin Chung, Yong-Fei Zheng, Zhidan Zhao, Zeng-Qian Hou, Xuan-Xue Mo
Summary: The generation of continental crust in collision zones involves the interplay between oceanic subduction and continental collision. The Gangdese continental crust in southern Tibet went through two stages of continental arc magmatism: fractional crystallization and remelting. The remelting process leads to the chemical maturation of juvenile continental crust, strengthening crustal stratification.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Zibra Ivan, Anthony I. S. Kemp, Smithies R. Hugh, Rubatto Daniela, Korhonen Fawna, Hammerli Johannes, Tim E. Johnson, Gessner Klaus, Roberto F. Weinberg, Jeff D. Vervoort, Martin Laure, Sandra S. Romano
Summary: Converging lines of evidence suggest that Earth transitioned from a stagnant-lid to a plate tectonics regime during the late Archean, but the details and timing of this transition are debated. Geological records indicate that subduction, a key component of plate tectonics, has been active since the Mesoarchean, but the tectonic processes within ancient convergent margins are poorly understood.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Harro Schmeling, Gabriele Marquart, Roberto Weinberg, Pirunthavan Kumaravel
Summary: This study explores two characteristic modes of magmatic processes in the continental crust, namely, batholith emplacement mode and convective recycling mode. The formation of magmas is influenced by factors such as heat input, melt mobility, and density of evolved rocks. The Altiplano-Puna low-velocity zone (LVZ) may represent the batholith emplacement mode, while the Tibetan LVZ may represent the convective recycling mode.
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
(2023)
Article
Geosciences, Multidisciplinary
Pei-yuan Hu, Qing-guo Zhai, Peter A. Cawood, Roberto F. Weinberg, Guo-chun Zhao, Yue Tang, Yi-ming Liu
Summary: Paleogeographic reconstruction of Precambrian terranes reworked by Phanerozoic orogens, such as the Tibetan Plateau, reveals complex lithotectonic relations due to intracrustal reworking. Global and regional detrital zircon rare earth element (REE) databases show trends in LREE/HREE and Eu/Eu* that record the crustal evolution of the source and provide a new approach for paleogeographic reconstructions. By analyzing sedimentary and igneous rocks in the Lhasa terrane and detrital zircon samples from the northern margin of Gondwana, it is demonstrated that the Lhasa terrane had an African affinity in the Rodinia-Gondwana supercontinent cycles (ca. 1.4-0.4 Ga).
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geosciences, Multidisciplinary
Wei Xu, Roberto F. F. Weinberg, Shi-Hong Tian, Zeng-Qian Hou, Zhu-Sen Yang, Lu Chen, Feng Lai
Summary: We studied geochemical data of Late Eocene volcanic rocks (including K-rich adakite-like rocks) from the southern Qiangtang terrane in central Tibet. The volcanic rocks show a continuous compositional range from high-K alkaline basalt to high-K calc-alkaline rhyolite, and have a narrow range of depleted Sr-Nd isotopic compositions compared to the pre-Eocene SQT crust. We propose that the KARs in the SQT formed through fractional crystallization of hydrous, alkaline melts derived from the lithospheric mantle, with amphibole and plagioclase dominating the fractionation process. Partial melting of the lithospheric mantle beneath the SQT may have been triggered by thermal perturbations caused by north-directed subduction of the Indian continental lithosphere beneath southern Tibet.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Pablo Farias, Roberto F. Weinberg, Alfonso Sola, Melanie Finch
Summary: U-Pb dating of zircon, monazite, and titanite combined with trace element composition is used to characterize the thermal evolution of the migmatitic Agua del Sapo complex. The complex experienced two consecutive early Paleozoic orogenies, associated with subduction and melting at upper-amphibolite facies. The accessory phases of detrital zircon, monazite, and titanite record different growth and dissolution-precipitation events during these orogenies. The prolonged high heat flow until 380 Ma blurs the boundary between the Famatinian and the subsequent Achalian/Chanic orogenies.
Article
Environmental Sciences
Carlos E. Ganade, Pierre Lanari, Daniela Rubatto, Joerg Hermann, Roberto F. Weinberg, Miguel A. S. Basei, Lucas R. Tesser, Renaud Caby, Yao Agbossoumonde, Caroline M. Ribeiro
Summary: Research findings suggest that a magmatic flare-up event in the Kabye Massif, Togo, led to crustal thickening. This was caused by increased magma productivity and crustal thickening resulting from dehydration of serpentinized mantle during the subduction of the hyper-extended margin of an approaching continent.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)