Article
Geochemistry & Geophysics
Jiayu Zhang, Lili Zhang, Yaowen Zhang, Yunsheng Yao, Haoran Li, Yiming Dai, Renlong Wang, Caixiong Hu
Summary: This study analyzes the impact of the Three Gorges Reservoir impoundment on seismic activity in the surrounding region. The results show a correlation between reservoir water levels and earthquake frequency, indicating a close relationship between the Xiannvshan fault activity and water levels. The study also reveals that the influence of reservoir water on the fault activity varies during different stages of impoundment.
Article
Geology
Stanislaw Z. Mikulski, Szymon Ostrowski
Summary: The abandoned historic gold mining areas in the Sudetes have potential for vein-type sulphide and gold deposits. A VLF geophysical survey revealed numerous linear anomalies, indicating the possible presence of unknown quartz-sulphide ore veins in former mining areas of gold and arsenic, as well as polymetallic sulphides in the Czarnow deposit. These areas show great promise for further prospecting of gold-bearing polymetallic sulphide ores. A shallow drilling campaign is suggested to assess the ore potential of the detected VLF anomalies.
GEOLOGICAL QUARTERLY
(2023)
Article
Geology
Sara Nerone, Alessandro Petroccia, Fabiola Caso, Davide Dana, Andrea Maffeis
Summary: This study investigates the retrograde evolution of the P-T-MH2O pathway in the Mt. Bracco Shear Zone, highlighting the importance of studying water content and the influence of lithological heterogeneities on fluid circulation regimes in shear zones.
JOURNAL OF METAMORPHIC GEOLOGY
(2023)
Article
Geology
T. E. Nichols, R. H. Worden, J. E. Houghton, R. A. Duller, J. Griffiths, J. E. P. Utley
Summary: This study explores how sediment texture and geochemistry can be used to classify sub-depositional environment and estuarine zone in a modern estuary using machine learning methods. The combination of textural and geochemical data improves model performance and helps reveal the environmental evolution of marginal marine sands.
SEDIMENTARY GEOLOGY
(2023)
Article
Geology
Rikke Weibel, Nynke Keulen, Stephen Hillier, Henrik Friis, Henrik Ingermann Petersen, Mette Olivarius, Sebastian Naesby Malkki, Jesper Stokkendal, Niels Hemmingsen Schovsbo
Summary: The Palaeogene glauconitic reservoir sandstones in the Nini West oilfield in the Danish North Sea are chosen as the first pilot CO2 storage site in Denmark. The stability of the glauconitic clasts in the sandstones is crucial for the long-term resilience of the reservoir. The study evaluates the likely reactivity of the glauconitic clasts during CO2 injection by examining their changes during burial diagenesis and finds that they have the potential for high reactivity, although their microporous structure slows down the reaction rate.
SEDIMENTARY GEOLOGY
(2023)
Article
Geology
Guohui Chen, Fangyang Hu, Alastair H. F. Robertson, Eduardo Garzanti, Shaohua Zhang, Fu-Yuan Wu
Summary: The study investigates the sedimentary processes of the Triassic Songpan-Ganzi basin in central China. By analyzing the detrital zircon age distribution and calculating the paleo-elevation of adjacent orogens, the source-to-sink evolution of the basin is reconstructed. The results suggest that the basin formed during a syn-collisional orogenic event.
SEDIMENTARY GEOLOGY
(2023)
Article
Geology
Yisu Ren, Xiaoyong Yang, Guangjie Wang
Summary: The Huayangchuan uranium (U)-polymetallic deposit in Central China is known for its unique metallogenic type and complex mineralization processes. This study provides geochemical and geochronological constraints on the magmatic and hydrothermal metallogenic processes in the deposit and offers insights into the REE, Nb, and U mineralization and remobilization mechanism. The carbonatite in the deposit is rich in Ba, Sr, Nb, U, and REE and has unique characteristics of igneous carbonatite. The total REE contents of carbonatite are significantly higher than that of other rock types. The ages of the deposit are determined to be Late Triassic and Early Cretaceous. The hydrothermal fluids during the Early Cretaceous contributed to the remobilization of Nb, U, and Ti.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Ivana Jelic, Janez Zavasnik, Marina Lazarov, Alena Zdravkovic, Sabina Kovac, Jovica Stojanovic, Aleksandar Pacevski
Summary: Arsenopyrite and pyrite are important carriers of microscopic and invisible gold, which can be released during the oxidation process of these sulfides. In the studied gold mineralization, native gold is mainly hosted by arsenopyrite and scorodite. The abundance of gold and Bi minerals correlates with the presence of scorodite, suggesting a low-temperature hydrothermal origin. The findings also indicate that colloidal-like gold is co-precipitated with the arsenates.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Ognjen Bonacci, Tanja Roje-Bonacci, Adrijana Vrsalovic, Kresimir Kuk
Summary: The paper analyzes the water temperature of Ombla, the largest karst spring in the Dinaric Karst. The study identifies two sub-periods with different characteristic water temperatures from January 1, 2007, to December 31, 2021. The first sub-period shows higher water temperatures while the second sub-period experiences a sudden drop in characteristic temperatures. The reaction of water temperature to air temperature is observed with a delay of about 1 month, and the reasons for the sudden drop in water temperature in January 2012 need to be determined due to the significance of this karst source.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Mehmet Furkan Sener, Mesut Simsek, Mustafa Utlu, Muhammed Zeynel Ozturk, Hasan Sozbilir
Summary: This study investigates the karst landforms and tectonic development of the Taurus Mountains, and finds that the morphometric features of micro and macro karst depressions are closely related to geological structures.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Sirwa S. Shangola, Hikmat S. Al-Jaleel, Faraj H. Tobia
Summary: Petrographic and geochemical studies were conducted on the Paleocene-Eocene carbonates of the Kolosh Formation in the High Folded Zone. The study revealed the depositional environment, diagenetic processes, and mineral composition of the carbonates. The carbonates showed different microfacies and were enriched in CaO, MgO, Cr, and Ni, while depleted in Na2O, K2O, TiO2, Al2O3, Rb, Ba, Th, and Zr. The REE patterns were similar to seawater, but with a slightly lower Y/Ho value, indicating alteration by freshwater. The δC-13 and δO-18 values suggested modification of the isotopic composition by factors such as temperature and organic matter. The study also found that the carbonates were deposited in oxidizing conditions and had a higher paleotemperature compared to global records.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Kun Zhang, Hong Liu, Xun Yang, Yufeng Wang, Zhiyun Sun, Luojia Hu
Summary: In this study, the waveform characteristics that correspond to different modes of reservoir development were defined by high-resolution processing of seismic data, well-seismic combination technology, forward simulation technology, and cross-well profiles. The seismic response modes of reservoirs in the area were summarized, sensitive attributes were optimized, and their plane distribution was finely depicted. The ability of seismic data to identify thin reservoirs was significantly improved and the predictions made with this method agreed well with the actual reservoir development.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Esmat A. Abou El-Anwar, Zeinab L. Belal, Salman A. Salman, Said H. Abd El Rahim, Wael Abdelwahab
Summary: In order to increase human productivity and ensure the security of phosphorus supply, further investigation on the geochemical characteristics of moderate carbonate phosphates is needed. The study of Um Queih Mine revealed that it belongs to intermediate grade phosphate ore with high concentrations of various elements and deposition in anoxic conditions. The mineralogical analysis showed that the phosphorites are mainly composed of fluorapatite and non-phosphatic minerals.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Dmitry A. Ruban
Summary: Ancient carbonate reefs, as geological heritage sites, have significant value for research, education, and tourism. However, the understanding of these reefs as geoheritage remains incomplete, highlighting the need for interdisciplinary cooperation among experts.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Zhin S. Abdulrehman, Ahmed M. Aqrawi, Renas I. Koshnaw
Summary: This study investigates the geochemical properties of the shallow marine Govanda Formation in the Arabia-Eurasia suture zone. The results reveal the depositional environment and diagenetic characteristics of the carbonate rocks in this formation, suggesting their origin in a passive margin tectonic setting.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Fernando Luiz Kilesse Salgado, Ismar de Souza Carvalho
Summary: Dastilbe crandalli is a small fossil fish species that feeds on algae and small organisms. Its streamlined body shape and forked fin allow it to swim at high speed. Research has shown that this species exhibited cannibalistic behavior during the Cretaceous period.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Robbyson Mendes Melo, Denize Santos Costa, Sonia M. O. Agostinho, Eduardo A. M. Koutsoukos, Claudia Gutterres Vilela
Summary: This study presents the foraminiferal biostratigraphy of the Upper Cretaceous-lower Paleogene succession of the Olinda and Poty cores in the Pernambuco-Paraiba Basin in northeastern Brazil. A total of 96 taxa of planktic foraminifera, belonging to 27 genera, that spanned the upper Campanian-lower Danian interval were recorded in this study.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Xin-Hui Chen, Lin-Fei Wang, Diying Huang, Liang Lu, Chenyang Cai
Summary: A new genus and species of rove beetles, Vidya scabra gen. et sp. nov., is described and illustrated based on a well-preserved amber specimen from the mid-Cretaceous period. This discovery represents the first record of Syntomiini as an amber bioinclusion and provides insights into the palaeodiversity of Oxytelinae during the mid-Cretaceous.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Fucheng Yang, Rolf L. Romer, Johannes Glodny, Wenchang Li
Summary: The study indicates that the Relin Mo-W (-Cu) deposit in the northern Sanjiang area is mainly derived from mantle melts that mixed with partial melts from the Paleoproterozoic crust. The formation of the deposit is mainly influenced by fractional crystallization and late-magmatic alteration, with strong sericite alteration resulting in enrichment of ore elements.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Yiwei Song, Lin Yang, Ke Yang, Bin Wang, Zhenyu Ma, Huanhuan Wu, Peng Li, Qingfei Wang
Summary: The study reveals the spatio-temporal and genetic relationships between tungsten (W) and gold (Au) mineralization in the West Qinling Orogen. The Zhaishang deposit, a large Au-W deposit, shows two separate mineralization events characterized by different geological observations and mineral assemblages.
ORE GEOLOGY REVIEWS
(2023)
