Article
Geology
Kun-Feng Qiu, Jun Deng, Hao-Cheng Yu, Ming-Qian Wu, Yu Wang, Lian Zhang, Richard Goldfarb
Summary: The study utilizes integrated cathodoluminescence imaging, trace element analyses, and fluid inclusion petrography to obtain detailed information on the characteristics of multiple generations of quartz growth in the Taiyangshan porphyry Cu-Mo deposit, NW China, and their relationship to ore genesis. The results reveal a complex history of hydrothermal quartz formation involving multiple fluid inclusions under varying pressure and temperature conditions, shedding light on the critical role of phase separation in porphyry mineralization.
ORE GEOLOGY REVIEWS
(2021)
Article
Geology
Zhang Yongmei, Gu Xuexiang, Yao Shiyue, Wang Jialin, Liu Ruiping
Summary: Integrated study of cathodoluminescence (CL) textures and compositions of quartz is an effective way to reconstruct the ore-forming conditions and processes of porphyry system under subduction tectonic setting. However, there is limited research on collision-type porphyry deposits. The Gao-gangshan deposit in NE China provides insights into the physicochemical conditions and evolution of ore fluids, as well as the Mo mineralization process, through the analysis of cathodoluminescent textures, trace elements, and fluid inclusions in quartz. The study reveals different quartz types with distinct cathodoluminescent textures, trace element concentrations, and fluid inclusion characteristics, indicating varying ore-forming environments.
ORE GEOLOGY REVIEWS
(2023)
Article
Soil Science
A. Molinero-Garcia, A. Muller, J. M. Martin-Garcia, S. L. Simonsen, R. Delgado
Summary: This paper examines the quartz grains in soils from the Quaternary fluvial terraces of the Guadalquivir River in southern Spain. Through analysis of the quartz grains' characteristics, the study sheds light on the sedimentological history of the terraces and discusses the spatial and temporal changes in the catchment area.
Article
Geosciences, Multidisciplinary
Shi-ling Wang, Hui-juan Peng, Tian-rui Wang, Hao Zou, Qi Zhou, Dong-jie Yang, Ce Sun, Xue Tian
Summary: The quartz phenocrysts from the Hongniu-Hongshan Cu skarn deposit in southwestern China were analyzed for various elements. The study identified three generations of quartz with different characteristics and temperature variations. The Ge/Al ratio of quartz was proposed as an effective discriminator between magmatic quartz and hydrothermal quartz.
FRONTIERS IN EARTH SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Mengmeng Shen, Mulin Huang, Zhiyun Lu, Xuemei He
Summary: This article presents a proposed quartz thermometer that is based on the concentration of [AlO4](0) tetrahedra. The thermometer calculates the concentration of [AlO4](0) tetrahedra in the quartz lattice and the formation temperatures of quartz by combining inductively coupled plasma optical emission spectrometry (ICP-OES) with X-ray photoelectron spectroscopy (XPS) data. This thermometer can be applied to quartz formed under equilibrium conditions and in Al-saturated environments over a wide temperature range, and effectively eliminates interference from different fluid compositions.
Article
Geology
Zhiyuan Sun, Jingbin Wang, Yang Wang, Yan Zhang, Lutong Zhao
Summary: The Meiling Cu-Zn (Au) deposit, characterized by multi-stage ore-bearing quartz veins, underwent potentially magmatic-hydrothermal fluid evolution and metallogenesis, showing affinity with epithermal deposits but influenced by high-temperature, high-salinity fluid and complex trends in Ti vs. Al discrimination diagram.
ORE GEOLOGY REVIEWS
(2021)
Article
Geochemistry & Geophysics
Hong Wang, Ting-Guang Lan, Hong-Rui Fan, Zhi-Long Huang, Huan-Long Hu, Ying-Hua Chen, Yan-Wen Tang, Jiao Li
Summary: The Jiaodong Peninsula is one of the largest gold provinces in the world. The mechanisms controlling gold deposition and the origin of auriferous fluids are still debated. This study used various analytical techniques to analyze the quartz samples from different gold deposits in the Jiaodong Peninsula. The results suggest that different mechanisms, such as fluid-fluid unmixing and fluid-rock interaction, led to efficient gold deposition in different types of mineralization.
Article
Geochemistry & Geophysics
Jue Lu, Wei Chen, Yuancan Ying, Shaoyong Jiang, Kuidong Zhao
Summary: This study examined the textural and chemical variations of apatite in three carbonatite-related REE deposits, revealing different apatite textures with distinct trace element compositions. Magmatic apatite has high Mn and Sr concentrations, with a steep REE chondrite-normalised pattern; metasomatic apatite has lower Mn and Sr concentrations, with variable REE trends; hydrothermal apatite has convex upward REE distributions, with the lowest Mn and Sr concentrations.
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
Yongmei Zhang, Xuexiang Gu, Brian Rusk, Wei Mao, Jialin Wang, Shaohua Zheng
Summary: The concentration difference of trace elements in quartz and K-feldspar from different types of felsic igneous rocks is closely related to the rock-forming process and P-T condition. The Ti concentration in quartz decreases while the Al, Li, and Ge concentrations increase from plutonic to pegmatitic rocks, indicating a higher degree of magmatic fractionation and lower crystallization temperature. In K-feldspar, certain elements show decreasing trends while others show increasing trends among different types of granitic rocks. The activation of Ti-impurity in both minerals leads to increased CL intensity, and there is a positive correlation between Ti concentrations in quartz and K-feldspar.
JOURNAL OF PETROLOGY
(2022)
Article
Geology
Wei Zhang, Wei Terry Chen, Xing -Chun Zhang, Yan-Wen Tang
Summary: Quartz is a common mineral in both magmatic-hydrothermal and carbonatite-related rare earth element deposits. Its trace element composition can be used to understand ore genesis in these deposits. Quartz in carbonatite-related REE deposits has low trace element concentrations and can be used to detect concealed carbonatite intrusions.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Liangliang Zhuang, Yucai Song, David Leach, Yingchao Liu, Zengqian Hou, Mahmood Fard
Summary: The Angouran deposit is the second-largest Zn-Pb deposit in Iran, hosting sulfide mineralization in a marble-schist sequence within a breccia pipe in a domal structure. The features of the ore-hosting breccias resemble known halokinetic diapir breccias, with subtle evaporite minerals.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2023)
Article
Geochemistry & Geophysics
Yu Wang, Kun-Feng Qiu, Axel Muller, Zhao-Liang Hou, Zhi-Hai Zhu, Hao-Cheng Yu
Summary: Trace elements of quartz play a significant role in geological studies, and using machine learning techniques can accurately evaluate and visualize trace element data, outperforming traditional methods.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Qing Lan, Jinrong Lin, Shanling Fu, Jincheng Luo
Summary: The study revealed distinct cathodoluminescent textures and trace element compositions of three generations of quartz, suggesting the ore-forming fluid was likely a low-temperature hydrothermal fluid. The presence of Al, Li, K, Na, and Ca as solid solutions, with Ge potentially replacing Si independently, and Fe and U occurring as micro-inclusions. The syn-ore quartz may have precipitated from a low-temperature hydrothermal fluid, indicating the quartz-pitchblende vein could have originated from such a fluid.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2021)
Article
Geology
Jiaxuan Zhu, Changming Wang, Qi Chen, Kangxing Shi, Hongyu Duan, Qiaoxin Li
Summary: The Chalukou deposit is a world-class porphyry Mo deposit in the Great Hingan Range, northeast China. Fluorites were analyzed to characterize the composition and temperature of mineralizing fluids. Different types of veins exhibit distinct geochemical features and fluorite textures, with temperature and fluorine fugacity playing significant roles in the formation process of the deposit.
ORE GEOLOGY REVIEWS
(2022)
Article
Geosciences, Multidisciplinary
Shan Xu, Xiangyun Hu, Emmanuel John M. Carranza, Gongwen Wang
NATURAL RESOURCES RESEARCH
(2020)
Editorial Material
Geosciences, Multidisciplinary
Ming Chang, Jiajun Liu, Emmanuel John M. Carranza, Chao Yin, Degao Zhai, Tong Wu
ACTA GEOLOGICA SINICA-ENGLISH EDITION
(2020)
Article
Geosciences, Multidisciplinary
Sergei Shevyrev, Emmanuel John M. Carranza
GEOLOGICAL JOURNAL
(2020)
Article
Geology
Shimin Zhen, Qingfei Wang, Dazhao Wang, Emmanuel John M. Carranza, Jiajun Liu, Zhenshan Pang, Zhizhong Cheng, Jianling Xue, Jiang Wang, Zhongjian Zha
ORE GEOLOGY REVIEWS
(2020)
Article
Geosciences, Multidisciplinary
Lihong Zhou, Mutian Qin, Dunqing Xiao, Chongbiao Leng, Hongjun Li, Shuyun Xie, E. J. M. Carranza, Jinning Zhang
Summary: The study utilized numerical image analysis technology to investigate the pore structures of volcanic and volcano-sedimentary rock samples, characterizing pore spaces automatically with multifractal parameters. The results effectively described irregularity and classified the samples into groups based on reservoir capabilities.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Jiayi Ma, Shuyun Xie, Dan Liu, Emmanuel John M. Carranza, Zhiliang He, Mohai Zhang, Tianyi Wang
Summary: The dissolution dynamics of carbonate rocks in shallow burial are important for the formation of high-quality reservoirs, with associated minerals playing a significant role in the dissolution processes. Metal ions in acidic fluids have been found to influence fluid properties and dissolution processes, impacting reservoir quality. Additional studies are needed to further understand the impact of associated minerals on the dissolution dynamics of carbonates.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Shuai Zhang, Emmanuel John M. Carranza, Hantao Wei, Keyan Xiao, Fan Yang, Jie Xiang, Shihong Zhang, Yang Xu
Summary: This study tested the efficacy of using an unsupervised convolutional auto-encoder network (CAE) to support convolutional neural network (CNN) modeling for data-driven mineral prospectivity mapping by synthesizing multi-geoinformation. The results demonstrated the potential of this approach for accurately mapping prospective and non-prospective areas, with strong spatial correlation observed between CNN modeling results and known Au deposits in the study area.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Saeid Esmaeiloghli, Seyed Hassan Tabatabaei, Emmanuel John M. Carranza
Summary: Recognition and mapping of mineralization-related patterns in geochemical data is crucial for predictive modeling of mineral deposit prospectivity. The study introduces a spatio-geologically informed fuzzy classification (SGIFC) to portray the spatial-frequency distribution of mineralization, integrating geochemical concentrations, 3D spatial properties, and geological knowledge. By incorporating a spatio-geological interaction model (SGIM) into fuzzy classification, more robust spatially connected patterns were achieved compared to standard fuzzy c-means models, indicating the effectiveness of SGIM in synthesizing comprehensive sample information for effective prediction of potential exploration targets.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geochemistry & Geophysics
Zhiqiang Zhang, Gongwen Wang, Yunna Ding, Emmanuel John M. Carranza
Summary: This study focused on the Tongling Cu(-Au) district in China, compiling and analyzing multiple datasets in order to explore blind mineral deposits in the subsurface. By constructing a 3D geological model and integrating various exploration criteria through spatial analyses and interpolation methods, high-potential Cu(-Au) targets were identified. The methodology discussed is applicable to other magma-skarn districts around the world.
JOURNAL OF GEOCHEMICAL EXPLORATION
(2021)
Article
Geology
Dazhao Wang, Shimin Zhen, Jiajun Liu, Emmanuel John M. Carranza, Jiang Wang, Zhongjian Zha, Yongsheng Li, Haijun Bai
Summary: The Dabaiyang deposit is a Te-Au deposit in the northern margin of the North China Craton, with four mineralization stages recognized and an ore-forming fluid identified as a medium temperature H2O-NaCl hydrothermal system. The formation of ore minerals in this deposit was predominantly influenced by mixing with low-temperature meteoric water and water-rock reactions.
ORE GEOLOGY REVIEWS
(2021)
Article
Geosciences, Multidisciplinary
Reza Ghezelbash, Abbas Maghsoudi, Amirreza Bigdeli, Emmanuel John M. Carranza
Summary: Mapping mineral prospectivity is plagued by stochastic and systemic uncertainties, with this study focusing on reducing the latter for Cu-Au mineralization in NE Iran. By introducing efficient evidence layers and a data-driven SAW procedure, the study successfully delineated favorable exploration targets. Comparison with a SVM model showed that SVM was more reliable in predicting high-potential areas of mineralization.
NATURAL RESOURCES RESEARCH
(2021)
Article
Geosciences, Multidisciplinary
Emmanuel John M. Carranza
Summary: This paper presents a knowledge-guided fuzzy logic modeling of regional-scale surficial uranium prospectivity in British Columbia, Canada. It introduces a new weighted fuzzy algebraic sum operator to combine certain spatial evidence layers, resulting in the prediction of at least 85% of known surficial U deposits/occurrences in the study region by integrating U-source, pathways, and traps spatial evidence layers. The analysis demonstrates the importance of utilizing known deposits to scrutinize spatial evidence layers and develop prospectivity models to reduce bias in mineral prospectivity analysis.
JOURNAL OF EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Shuai Zhang, Emmanuel John M. Carranza, Keyan Xiao, Zhenghui Chen, Nan Li, Hantao Wei, Jie Xiang, Li Sun, Yang Xu
Summary: This paper explores the use of unsupervised cluster analysis to assist in mineral prospectivity mapping by clustering geochemical data and exploring the coherence of spatial signatures at mineralized locations. A systematic procedure based on ISODATA was proposed and applied in the Hezuo-Meiwu district in Gansu Province, China. The integration of evidence maps yielded high favorability score maps for delineating mineralized locations, proving the efficacy of unsupervised cluster analysis in MPM. Additionally, coherence of spatial signatures and outlier analysis are important for data-driven MPM.
NATURAL RESOURCES RESEARCH
(2021)
Article
Computer Science, Interdisciplinary Applications
Sergei Shevyrev, Ekaterina V. Gorobeyko, Emmanuel John M. Carranza, Natalia G. Boriskina
Summary: The largest Au-Ag deposits in the eastern Asian region occur along the borders of cratons and superterranes. Meanwhile, intra-terranean areas host numerous small deposits, the prospecting and exploration of which are complicated by natural factors. The novelty of this research includes overcoming difficulties in delineating new prospective areas with machine learning and decreasing vegetation effects for prospecting epithermal Au-Ag deposits.
EARTH SCIENCE INFORMATICS
(2023)
Article
Environmental Sciences
Jamie-Leigh Robin Abrahams, Emmanuel John M. Carranza
Summary: The study investigates the use of VNIR-SWIR spectroscopy for predicting trace metals in overbank sediments. Regression models were built using spectral absorption feature parameters (SAFPs) derived from measured ground spectra, and the predictive capacities of the models were evaluated. The results suggest that trace metals can be indirectly predicted using the SAFPs associated with goethite and kaolinite.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(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.