Review
Geology
Adrian Immenhauser
Summary: This paper reviews the concepts, processes, and products that characterize the burial realm from the viewpoint of the carbonate geoscientist. It presents and discusses typical features of carbonate burial in different burial domains, from shallow to deep, and proposes improved conceptual delimitation and subdivision with intuitive terminology. The transition from shallow burial to deep-burial domains is described, including changes in fluid types, porosity evolution, and diagenetic fabrics.
DEPOSITIONAL RECORD
(2022)
Article
Geology
Xiu-Zheng Zhang, Qiang Wang, Derek Wyman, Quan Ou, Yue Qi, Guo-Ning Gou, Wei Dan, Ya-Nan Yang
Summary: This study investigates crustal xenoliths and zircon xenocrysts in lavas from the Qiangtang Block to better understand the deep crust and mantle events associated with the topographic transition of central-northern Tibet. The findings suggest that the middle crust of the block has been hot since the early Miocene, supporting the formation of unexposed felsic plutons during crustal melting. The results also indicate that the early Miocene cold-hot thermal transition of the middle-lower crust was synchronous with the topographic evolution from high-relief mountains to a flat plateau, highlighting the role of crustal flow in the topographic smoothing mechanism for central-northern Tibet.
Article
Geology
Jing-Yuan Zhang, Qingfei Wang, Xue-Fei Liu, Guo-Fa Zhou, Hai-Peng Xu, Yi-Guang Zhu
Summary: Permian lithium-rich karstic bauxites were discovered in central Yunnan province, China, and their origin and formation processes were studied. The differences between different profiles and the controlling factors of mineralization conditions were found. The results have important implications for the exploitation of aluminum and lithium.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Anqi Zhang, Zhen Guo, Juan Carlos Afonso, Heather Handley, Hongkun Dai, Yingjie Yang, Y. John Chen
Summary: By inverting new data and combining with independent geochemical data, this study reveals the detailed thermal and compositional structures beneath northeast China, demonstrating the presence of regions of partial melting in the mantle. It is found that the generation, location, and composition of intraplate volcanism in this region are controlled by the interaction between shallow asthenospheric circulation and lithospheric thickness. The modeling approach and correlations identified in this study are globally applicable for assessing mantle conditions over time in other continental regions.
Article
Geology
Wu FuYuan, Guo ChunLi, Hu FangYang, Liu XiaoChi, Zhao JunXing, Li XiaoFeng, Qin KeZhang
Summary: Nanling Range in South China is known for its significant mineralizations of W, Sn, Nb, Ta, Zr, Hf, Cu, Mo, Pb, Zn, Bi, Sb, U, Li, Be, REE, etc. Through field investigation and indoor observations, it was found that the Yanshanian granites in Nanling Range underwent a long-term separation of crystal and residual melt. This separation was controlled by the continuous input of mafic magma and the protection of the marginal pegmatite cover. The Nanling granite and Himalayan leucogranite have different mechanisms of highly fractionated granitic magma.
ACTA PETROLOGICA SINICA
(2023)
Article
Geology
Sara Schreder-Gomes, Kathleen C. Benison, Jeremiah A. Bernau
Summary: Well-preserved primary fluid inclusions containing organic solids and liquids were found in the 830-million-year-old halite from central Australia. This discovery has important implications for the search for life in both terrestrial and extraterrestrial chemical sedimentary rocks.
Article
Geology
Johan Vellekoop, Pim Kaskes, Matthias Sinnesael, Jarno Huygh, Thomas Dehais, John W. M. Jagt, Robert P. Speijer, Philippe Claeys
Summary: This study provides the first high-resolution stable carbon isotope stratigraphy and chemostratigraphy of the Maastrichtian period, offering accurate data for the age assessment and global correlation of Maastrichtian strata.
NEWSLETTERS ON STRATIGRAPHY
(2022)
Article
Geology
Peng Wang, Guochun Zhao, Peter A. Cawood, Yigui Hang, Shan Yu, Qian Liu, Jinlong Yao, Donghai Zhang
Summary: Constraining the positions of, and interrelationships between, Earth's major continental blocks has played a major role in validating the concept of the supercontinent cycle. The position of the Tarim craton is important for understanding the breakup of Rodinia and subsequent assembly of Gondwana. The ages and isotopic characteristics of detrital zircons in the South Tarim and north India support the idea that Tarim was located on the margin of both supercontinents. The tectonic transitions and drift between North Tarim and South Tarim emphasize the importance of retreating subduction in supercontinent dispersal.
Review
Geology
Louis J. Cabri, Thomas Oberthuer, Reid R. Keays
Summary: This study reviews the assemblages of detrital platinum-group minerals in placers worldwide and identifies common and distinctive features related to their depositional history. The study highlights the influence of environmental conditions and bacterial activity on the formation and stability of different platinum-group minerals.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Alexander J. Dickson, Erdem Idiz, Don Porcelli, Melissa J. Murphy, Ricardo Celestino, Hugh C. Jenkyns, Simon W. Poulton, Stephen P. Hesselbo, John N. Hooker, Micha Ruhl, Sander H. J. M. van den Boorn
Summary: The study explores the importance of isotope ratios of redox-sensitive metals in organic-rich rocks for understanding past deoxygenation and nutrient cycling on Earth, and investigates the impact of thermal alteration on the isotopic data in host sediments.
Article
Geology
Jiri Zak, Martin Svojtka, Ianko Gerdjikov, Alexandre Kounov, Dian A. Vangelov
Summary: The study focuses on analyzing four lithotectonic units in the Balkans using detrital zircon U-Pb geochronology to understand their formation and origins. Through statistical comparison and multidimensional scaling, the Balkan terranes are compared with other terranes from the Eastern Alps to Iran, revealing their paleogeographic positions and significant dextral strike-slip displacements.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geology
Darwinaji Subarkah, Morgan L. Blades, Alan S. Collins, Juraj Farkas, Sarah Gilbert, Stefan C. Lohr, Ahmad Redaa, Eilidh Cassidy, Thomas Zack
Summary: Authigenic components in marine sediments play a crucial role in reconstructing past environments. However, determining reliable age constraints and assessing post-depositional processes in Precambrian sequences is challenging. This study introduces a new laser-based technique that combines in situ Rb-Sr dating and trace-element analysis to evaluate the depositional and alteration histories of Proterozoic shales. The results demonstrate the potential of this method in efficiently dating and distinguishing primary marine processes from secondary ones, making it a powerful tool for future studies of ancient marine shales.
Article
Geochemistry & Geophysics
Qiang Li, Guiyi Wu, Dezhong Kong
Summary: This paper investigates the dynamic evolution characteristics of stope roof caving and the stress environment change law under repeated mining in close-distance coal seams. It provides control strategies for stope roof under repeated mining based on thorough study findings.
Article
Geology
Qiong Wu, Cheng-You Feng, Jing-Wen Mao, M. Santosh, Jeffrey M. Dick, Miao Yu, Bin Li
Summary: The study focuses on the magmatic-hydrothermal processes and associated mineralization of the Xianghualing deposit in southern Hunan Province, China. By employing multiple dating methods, the study establishes a precise geochronological framework for the deposit, with monazite identified as a robust tool for dating highly evolved granites. The results suggest a temporal and genetic link between the emplacement of granites and polymetallic mineralization in the region.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Tim J. B. Holland, Eleanor C. R. Green, Roger Powell
Summary: Activity-composition (a-x) relations for feldspars in the KAlSi3O8-NaAlSi3O8-CaAl2Si2O8 system were calibrated using various experimental data and models. The model (4TR) which best reproduced the experimental data was identified, showing its suitability for petrological phase equilibrium calculations involving high-temperature mixing.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geology
Mattia Gilio, Marco Scambelluri, Ross J. Angel, Matteo Alvaro
Summary: Accurate characterization of the pressure and temperature (P-T) histories of eclogite facies rocks is crucial for understanding subduction zone processes, with methods like elastic geobarometry providing constraints and aiding in interpreting geophysical images of present-day converging plates. These methods are particularly useful in ultra high pressure (UHP) metamorphic terranes where conventional equilibrium geothermobarometers face challenges.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geology
Francesco Nosenzo, Paola Manzotti, Marc Poujol, Michel Ballevre, Jessica Langlade
Summary: This study investigates the Palaeozoic history of the northern Dora-Maira Massif involved in Alpine continental subduction. The results show the presence of a low strain domain in the region where the pre-Alpine amphibolite-facies foliation has been preserved. Thermodynamic modeling based on garnet isopleths constrains the pre-Alpine pressure-temperature (P-T) evolution, while the analysis of garnet and metamorphic zircon provides insights into the peak Barrovian metamorphic conditions and early exhumation or cooling processes.
JOURNAL OF METAMORPHIC GEOLOGY
(2022)
Article
Geology
Zhewen Xu, Tao Li, Gaojun Li, David W. Hedding, Yunqiang Wang, Long-Fei Gou, Liang Zhao, Jun Chen
Summary: Lithium isotopes have the potential to trace Earth surface processes. The study proposes an in situ mechanism involving evapotranspiration to explain the formation of high δLi-7 values and provides evidence from the Chinese Loess Plateau. The research suggests that the influence of evapotranspiration on riverine δLi-7 may partly explain the variations of seawater δLi-7.
Article
Geology
M. Ouchchen, S. Boutaleb, E. H. Abia, D. El Azzab, A. Miftah, B. Dadi, F. Z. Echogdali, Y. Mamouch, B. Pradhan, M. Santosh, M. Abioui
Summary: This study successfully identified the geochemical signatures of copper deposits in the Anti-Atlas region of Morocco using stream sediment data. It provides an approach for evaluating potential mineral resources.
ORE GEOLOGY REVIEWS
(2022)
Article
Geology
Jingxing Yu, Dewen Zheng, Jianzhang Pang, Chaopeng Li, Ying Wang, Yizhou Wang, Yuqi Hao, Peizhen Zhang
Summary: This study reports low-temperature thermochronology data from the Qinling and Taihang Mountains in China and shows through age-elevation relationships and thermal history modeling that both mountain ranges experienced a phase of rapid exhumation during the late Oligocene and early Miocene. The findings suggest that mountain building in eastern China may have played a significant role in the reorganization of the Cenozoic Asian climate regime.
