Article
Geology
Calum P. Fox, Jessica H. Whiteside, Paul E. Olsen, Xingqian Cui, Roger E. Summons, Erdem Idiz, Kliti Grice
Summary: High-resolution biomarker and compound-specific isotope distributions, coupled with the degradation of calcareous fossil remnants, reveal that intensive euxinia and decalcification driven by Central Atlantic magmatic province activity formed a two-pronged kill mechanism at the end-Triassic mass extinction.
Article
Geology
Jiangning Yin, Nan Li
Summary: This study applied machine learning algorithms (XGBoost and RF models) to create mineral prospectivity mapping (MPM) for a specific area in southern Hunan Province, China. The models were optimized using a Bayesian optimization algorithm (BOA) to improve their performance. The results showed that the XGBoost model outperformed the RF model in terms of accuracy and stability, indicating its great potential for MPM.
ORE GEOLOGY REVIEWS
(2022)
Article
Geochemistry & Geophysics
Peng Zhang, Dingfei Zhang, Yang Yang, Wengang Zhang, Yawen Wang, Yajing Pan, Xiaozheng Liu
Summary: This article discusses how to construct a geological body model in complex geological areas using limited geological data information to achieve integrated spatial information expression. By integrating above- and underground information and considering existing geological information using profile maps. The article focuses on the geological model construction of a primary school in Shuicheng County, Guizhou Province, using the GoCAD platform as an example.
Article
Geochemistry & Geophysics
Wei Li, Majid Khayatnezhad, Afshin Davarpanah
Summary: This study aims to statistically measure the amount of fresh water provided by treated water from reused sources, and empirically explores various treatment methods. The findings indicate significant water savings can be achieved through this system.
Article
Geochemistry & Geophysics
Yang Yu, Guang-liang Feng, Chang-jie Xu, Bing-rui Chen, Da-xin Geng, Bi-tang Zhu
Summary: This study investigates the quantitative threshold of energy fractal dimension for immediate rock burst warning in deep tunnels based on the cases of rock bursts in Jinping Hydropower Station in China. A calculation method for energy fractal dimension in deep linear tunnels associated with microseismic monitoring is proposed. The mechanism analysis assesses the distribution range and evolution of energy fractal dimension during the development of rock bursts. The results provide a guide for establishing a dynamic warning system and scientific basis for prediction, warning, and risk-control standards of rock burst disasters during the excavation of deep tunnels.
Article
Geology
Khadidja Boutaleb, Rafik Baouche, Moussa Sadaoui, Ahmed E. Radwan
Summary: This research investigates the Lower Turonian carbonate succession in the Djebel Darmoun Field, Algeria, focusing on microfacies, diagenesis, petrophysical, and geochemical characteristics. The study reveals the potential of this area as an unconventional reservoir unit and provides insights into factors controlling the pore system network and organic richness.
SEDIMENTARY GEOLOGY
(2022)
Article
Geology
Haytham Sehsah, Ahmed M. Eldosouky
Summary: This study integrated geochemical and magnetic data to investigate two ophiolite belts in the Central Eastern Desert of Egypt and proposed that intraoceanic subduction zones were the dominant tectonic style during the Neoproterozoic era.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Jing Bi, Jincai Tang, Chaolin Wang, Daguo Quan, Mingyang Teng
Summary: This paper proposes a method for creating internal flaws in specimens using the volatilization of camphor and investigates the internal damage behavior of flawed specimens through compression tests and CT techniques. The experimental results show that the strength and deformation properties of flawed specimens increase nonlinearly with the confining pressure and flaw inclination angle. The crack coalescence patterns and failure modes of flawed specimens depend on both the confining pressure and the flaw inclination angle.
Review
Geology
Roger G. Skirrow
Summary: This study critically assesses the characteristics of ten metallogenic provinces hosting iron oxide Cu-Au deposits and proposes a new classification framework. The classification is based on geological settings, oxide-sulfide mineralogy, and ore geochemical characteristics, and distinguishes these deposits from other mineral systems. The IOCG and ISCG deposits in CGI mineral systems are characterized by elevated levels of Fe and associations with Cu and Au, forming a distinctive resource. The geochemical variations in these deposits are correlated with redox characteristics and geological-tectonic settings, suggesting fundamental factors in their formation.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Dong Fu, Bo Huang, Tim E. Johnson, Simon A. Wilde, Fred Jourdan, Ali Polat, Brian F. Windley, Zhaochu Hu, Timothy Kusky
Summary: This study reports the discovery of early Paleozoic boninitic blueschists and associated greenschists from the eastern Proto-Tethyan North Qilian orogenic belt in northeastern Tibet. These rocks provide important insights into the initiation and subsequent subduction processes of an intra-oceanic subduction zone. The findings also highlight the role of former upper plate island arc/forearcs in reducing the preservation of initial subduction-related rock records in ancient orogenic belts.
Article
Geology
Fuyun Cong, Jinqiang Tian, Fang Hao, Andrew R. C. Kylander-Clark, Wenqing Pan, Baoshou Zhang
Summary: Secondary oil migration processes can be quantitatively constrained using oil-inclusion fluorescence and in situ calcite U-Pb dating. The study revealed two main oil charge events and a northward-decreasing trend for oil maturity during single charge events. Active faults and dilatant fractures along faults act as major vertical oil-migration pathways.
Article
Geology
Tong Li, Renguang Zuo, Xinfu Zhao, Kuidong Zhao
Summary: This study proposes a convolutional neural network (CNN) and generative adversarial network (GAN) to map mineral prospectivity of regolith-hosted rare earth elements (REE) deposits. The CNN achieves high accuracy in training and validation, and the GAN-based augmentation method effectively guides further exploration in the study area.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Jillian Kendrick, Manuel Duguet, Chris Yakymchuk
Summary: Tonalite-trondhjemite-granodiorite (TTG) suites are a debated component of Earth's first continents. We propose a new petrological-geochemical model that explains the coexistence of TTGs in the middle crust and suggests that their compositions are controlled by the separation of early-crystallizing plagioclase and melt.
Article
Geology
Habib Mollai, Rahim Dabiri, Habib Allah Torshizian, Georgia Pe-Piper, Wei Wang
Summary: Magmatic rocks from the Late Neoproterozoic to Early Cambrian (Cadomian) period are abundant in Iran, particularly in the east-central region. This paper focuses on the Cadomian rocks found in the Tapeh Tagh area of eastern Iran, providing data on their geochemistry and uranium-lead (U-Pb) zircon ages. The rocks in this region consist of Cadomian meta-igneous rocks, including various types of granitic gneiss, as well as overlying meta-sedimentary rocks. The geochemical and geochronological characteristics of these rocks are similar to those of other Cadomian granites and gneisses in Iran and Turkey.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
Liqiang Ma, Naseer Muhammad Khan, Kewang Cao, Hafeezur Rehman, Saad Salman, Faheem Ur Rehman
Summary: In rock mechanics, the dilatancy point, which occurs before rock failure, is influenced by water content and plays a crucial role in assessing the stability of rock engineering structures. This study examines the impact of water content on the dilatancy point in sandstone under loading, utilizing infrared radiation as an input parameter for artificial intelligence techniques. The experimental findings indicate that water content affects the stress-strain curve stages, and the dilatancy point can be predicted using computational techniques such as artificial neural network, random forest regression, and k-nearest neighbor.
Article
Geology
Qing Yang, Xiao-jun Zhang, Thomas Ulrich, Jun Zhang, Jian Wang
Summary: Trace elements in sphalerite and pyrite from six deposits at the Sichuan-Yunnan-Guizhou lead-zinc metallogenic province were analysed to determine their composition, distribution characteristics, and substitution mechanisms by LA-ICP-MS analyses. Results revealed significant correlations and substitution mechanisms between certain elements in sphalerite and pyrite, as well as regional variations in composition and ratios. The Co/Ni ratio in pyrite may serve as a vector for geochemical exploration of Pb-Zn mineralization, with ratios close to 0.1 indicating potential for larger deposits.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Shan Li, Calvin F. Miller, Wang Tao, Wenjiao Xiao, David Chew
Summary: Granite typology categorizes granitoid rocks based on distinguishing characteristics that indicate sources, generation conditions, and tectonic settings, though complexities in geochemistry often lead to more complex petrogenetic histories. Granitoids in the eastern Tibetan Plateau exhibit a wide range of geochemical characteristics and source contributions, with isotopic compositions suggesting a significant influence from sediment in their magmas of all types. The highly variable isotopic compositions of these contemporaneous granitoids from diverse sources demonstrate the difficulty of straightforward assignment and interpretation using conventional typology.
Article
Geology
Tian-Yu Lu, Zhen-Yu He, Reiner Klemd
Summary: The Nyemo composite pluton in southern Tibet provides evidence for the coexistence of high-silica magmas and complementary silicic cumulates. The research sheds light on deep crustal magma sources and crystal-melt separation processes, suggesting highly fractionated melts were extracted from a mush reservoir at unusually low storage pressure.
Article
Geochemistry & Geophysics
Lingling Han, Xizhe Li, Wei Guo, Wei Ju, Yue Cui, Zhaoyi Liu, Chao Qian, Weijun Shen
Summary: This study examines the development characteristics and controlling factors of the Wufeng-Longmaxi shale in the Luzhou block, Southern China. The study reveals the importance of natural fractures in the storage and production of shale gas, and establishes quantitative limits for shale gas preservation. The findings provide valuable insights for further shale gas exploration and development in the southern Sichuan Basin.
Article
Geology
Xin Zhou, Tao Zhan, Luyao Tu, John P. Smol, Shiwei Jiang, Xiaoyan Liu, Chenxi Xu, Zhengtang Guo
Summary: This study uses pollen data from the East Asian monsoon region to explore the spatiotemporal patterns of monsoon precipitation changes. It finds that the timing of maximum precipitation is influenced by monthly insolation changes, occurring earlier in the southern area and later in the northern area.
