Article
Geology
S. V. Shczepetov, A. B. Herman
Summary: This article discusses the geological mapping and plant fossil collection in Northeast Asia in the 1970s. The previous stratigraphic chart was found to be incorrect, and the collected material was assigned to nonexistent stratigraphic units. The new investigation reveals that the plant fossils collected in the Ul'ya-Urak interfluve are representative and well-preserved. They are now referred to as the Ul'ya flora and can be further studied.
STRATIGRAPHY AND GEOLOGICAL CORRELATION
(2023)
Review
Geology
Yuhan Li, Jinkai Wang, Chun Li, Jun Xie, Rui Wu
Summary: For carbonate reservoirs primarily composed of micrite particles, fractures play a crucial role in fluid flow and storage of oil and gas. However, accurately characterizing and predicting these fractures can be challenging due to their small scale and irregular distribution. This study proposes a discrete fracture network (DFN) modeling method based on radial basis interpolation, which improves the accuracy of fracture distribution prediction by considering both stochasticity and uncertainty. The results show that the DFN model with radial basis function (RBF) is reliable and consistent with actual geological conditions and well production data.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Dao-Ming Yang, Tong Hou, Wenlei Song, Jingyi Qin, Diao Luo, Meng Wang, Ilya V. Veksler
Summary: The Miaoya carbonatite-syenite complex in central China hosts both Nb and REE mineralization. Our study of zircon grains within the complex revealed that the zircons experienced different formation processes during early and late stages of magma differentiation. Secondary zircons underwent solid-state recrystallization and dissolution-reprecipitation, likely caused by infiltration of late-stage residual carbonatitic melts.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Tingting Yu, Sha Li, Rodrigo B. Salvador, Dangpeng Xi, Haichun Zhang, Xiaoqiao Wan
Summary: A study on the gastropod faunas from the Cretaceous-Paleogene (K/Pg) boundary transition in the Songliao Basin in China reveals that freshwater gastropods in East Asia experienced minor extinction, with a high survival rate. This study sheds light on patterns of selective extinction in freshwater environments.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Wen Ma, Yucai Song, Teng Deng, Liangliang Zhuang, Wei Wu
Summary: This study investigates fluid properties and mass transfer during the hydrothermal bleaching alterations in the Lanping Basin, SW China. The results provide insights into the contributions of different source rock types to the Cu, Co, Pb, and Zn deposits and the role of reduced fluids in Cu mineralization.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Xiaoyu Zhang, Zhijie Xu, Yanfang Lu, Kongyang Zhu, Jingya Wang, Miao Yu, Mu Huang, Xuefa Shi
Summary: This study quantified the presence of tellurium (Te) in different minerals and revealed its geochemical behavior in deep-sea sediments. The results suggest that Te is mainly sourced from submarine volcanogenic hydrothermal activities and is associated with volcanic materials and weathering products of terrigenous rocks.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Yang Gao, Dongdong Zhang, Jiaqi Zhao, Xinkai Chen, Zhenhua Zhou, Qingfeng Ding, Jiarui Feng, Guodong Liu
Summary: This study presents new age dating, geochemical compositions, and Sr-Nd isotopic data for the granitoids in the Yuanlinzi Sn-Cu deposit in Northeast China, which is a Cu-rich Sn deposit. The results show that the Sn mineralization at Yuanlinzi was formed at about 138 Ma, with associated granites dated to the Early Cretaceous period. The granites display geochemical characteristics of A-type granites and are derived from partial melting of the juvenile middle-upper crust. The study suggests that the injection of Cu-bearing mafic magma/fluid played a key role in the formation of the Cu-rich Sn deposit.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Bo-ling Pu, Feng-qin Wang, Wei-wei Zhao, Ke Wang, Jian-bo Sun
Summary: This study examines the favorable development intervals of the Chang 7 gas shale in the Ordos Basin, China. By analyzing multiple geological factors, two types of favorable intervals are identified. The research results effectively explain the enrichment mechanism of shale gas and provide guidance for its exploration and development.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Zhen Zhang, Min Wang, Yong-an Qi, Bingchen Liu
Summary: This study investigates the microbial origin of ooids in the Cambrian Miaolingian Series, North China, using various microscopy techniques. The findings suggest that filamentous cyanobacteria played a significant role in the formation of micrite in ooids, especially in the cortices of giant ooids. The presence of different types of microbial mineralization fabrics further supports the microbiological genesis of ooids.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Shaikh Asjad, K. F. Khan, M. A. Quasim, H. K. Sachan, Aashna Javed
Summary: Microfacies, diagenesis, and stable isotope analysis of the Kuldhar Member Limestone (KML) were conducted to reconstruct its depositional environment and evaluate the impact of diagenesis on reservoir quality. The study revealed that diagenetic processes such as micritization, cementation, and compaction affected the reservoir quality negatively, while dissolution and fracturing had a positive impact.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Chun Huan, Hai -Zhen Wei, Wen-Bin Zhu, M. R. Palmer, He-Feng Lin, Bi -Hai Zheng, Yue Cai, Da-Sheng Zuo, Jun-Lin Wang, Zhi-Qin Xu
Summary: This study investigates the association between Li enrichment and granitic magma evolution in the Jiajika pegmatite-type Li deposit using B isotope analyses of tourmaline grains. The results suggest that magma differentiation and fluid exsolution facilitate the enrichment of Li during granitic magmatic evolution. This has important implications for the formation and exploration of Li deposits.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Zi-Hao Zhao, Pei Ni, Ming-Sen Fan, Jun-Ying Ding, Jun-Yi Pan, Yong-Kang Chen, Zheng Liu, Zhen Zhang
Summary: The GDC deposit in the NHY metallogenic belt is classified as an intermediate-sulfidation epithermal deposit, showing similarities to typical epithermal Pb-Zn deposits and having a possible relationship with porphyry deposits.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Wanyi Feng, Jiahao Zheng
Summary: This study investigates the ore-forming mechanism of two representative magmatic Fe-Ti oxide deposits in eastern Tianshan, NW China, using trace elements and O-Sr isotopes of apatite. The results reveal that these two deposits have different magmatic sources and are associated with continental crustal materials. The study highlights the significance of using trace elements and O-Sr isotopes of apatite to analyze magmatic Fe-Ti oxide deposits.
ORE GEOLOGY REVIEWS
(2023)
Article
Geology
Nicholas R. Longrich, Erik Isasmendi, Xabier Pereda-Suberbiola, Nour-Eddine Jalil
Summary: The end of the Cretaceous witnessed the diversification of dinosaur faunas on different landmasses, primarily due to continental fragmentation. This study focuses on the understudied dinosaur faunas of southern land masses, particularly the latest Cretaceous of Africa, which remains largely unknown. The authors report two new abelisaurid fossils from Morocco, suggesting the coexistence of multiple abelisaurid taxa in the late Maastrichtian, indicating a high level of dinosaur diversity in North Africa prior to the mass extinction at the end of the Cretaceous.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Pavel P. Skutschas, Veniamin V. Kolchanov, Alexander O. Averianov, Rico Schellhorn, Petr N. Kolosov, Marc E. H. Jones, Thomas Martin
Summary: This study examines isolated incomplete salamander dentaries from the Lower Cretaceous Teete locality in Yakutia, Eastern Siberia, Russia. The findings provide evidence of the existence of small-sized salamanders in high latitudes during the Mesozoic era. The dentaries exhibit distinct morphological features and a neurovascular system similar to that of small-sized non-karaurid salamanders from the Juro-Cretaceous period.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Shahin Abd-Elhameed, Abdel Aziz Mahmoud, Yasser Salama
Summary: This study investigates two stratigraphic sections in the Galala Plateaus of the north Eastern Desert, Egypt, and records a diverse larger benthic foraminiferal assemblage from the upper Paleocene-lower Eocene Southern Galala Formation. Analysis identifies 28 larger foraminiferal species belonging to 13 genera, and compares their stratigraphic range with established Tethyan zonations. The study designates nine shallow benthic zones and identifies seven microfacies types, suggesting restricted tidal flat inner ramp to open-marine middle ramp environments for deposition.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Kornelia Skibinska, Qingqing Zhang, Jan Sevcik, Katarzyna Kopec, Wieslaw Krzeminski
Summary: Three new species belonging to the genus Palaeoglaesum were described and illustrated in this study, based on the observations of Bruchomyiinae (Psychodidae) in mid-Cretaceous amber from northern Myanmar. The analysis of new specimens provided further insights into the morphology of this group in the Cretaceous period.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Feng Guo, Yankai Zhu, Xiaoxia Peng, Qi Pan, Wenfang Yuan, Zhilin Yang
Summary: The Paleogene strata in the Southwest Tarim Basin are important reservoirs of hydrocarbons, characterized by high-quality reservoir rocks. The formation of these reservoirs is a result of depositional environment, diagenesis, and tectonics. The stratigraphic evolution of the Paleogene is recorded in the vertical changes of sedimentary environment and climate. The study of paleoenvironment has provided a foundation for predicting reservoir rocks in this mixed clastic-carbonate sequence. The best reservoirs in the Paleogene are braided channel sandstones and restricted platform grainstones. Tectonic fracturing has played a significant role in improving the quality of reservoir rocks.
CARBONATES AND EVAPORITES
(2023)
Article
Geology
Sara Criniti, Manuel Martin-Martin, Agustin Martin-Algarra
Summary: Carboniferous sandstone in southern Spain plays a significant role in the sedimentary budget of convergent plate boundaries during the Variscan s.s. to Paleotethysian orogenic period. The sandstone carries quartzolithic composition with high-to-medium-low grade metamorphic content, sourced from volcanic and ophiolitic detritus that could be as old as approximately 330 Ma. This detritus is likely derived from a lithic and transitional recycled orogen involved in plate convergence and uplifted during mid-Late Carboniferous time. The presence of serpentinite-like detritus suggests the dismantling of metamorphosed oceanic crust. The study of these Mid-Late Carboniferous sandstones contributes to paleogeographic reconstructions and provides constraints for the transitional area between the Iberian-French massifs and the African Paleo-Atlas Domain.
SEDIMENTARY GEOLOGY
(2023)
Article
Geology
Malena Juarez, E. Martin Hechenleitner, Agustin G. Martinelli, Sebastian Rocher, Lucas E. Fiorelli
Summary: Limited records of Cretaceous theropod dinosaurs in Argentina, particularly in the Patagonian region. Recent discoveries in the Northwest of Argentina confirmed the presence of abelisaurid theropods and peirosaurid crocodyliforms in the Upper Cretaceous of La Rioja Province. The findings suggest the potential presence of multiple abelisaurid species in the region and offer exciting prospects for future expeditions.
CRETACEOUS RESEARCH
(2023)
