Article
Geology
Alberto Perez-Lopez, Constantino Benedicto, Federico Orti
Summary: The eastern sector of the Mesozoic Iberian basin belongs to the 'Mediterranean type' Triassic, characterized by a stratigraphic record with two carbonate Muschelkalk units. The evolution of the platform morphology from an epicontinental platform to a lower energy rimmed shelf is depicted through the deposition of shallow-water carbonates and tidal/lagoon environments.
SEDIMENTARY GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Juergen Schieber, Xinhe Shao
Summary: The Portwood Member of the New Albany Formation is a dolomitic black shale succession deposited in the western Appalachian Basin, consisting of three erosion-bounded stratal packages recording Late Givetian eustatic sea-level variations. Detailed petrographic study and thin section based microfacies analysis shed light on depositional setting and history, identifying multiple sedimentary settings and enabling subdivision into a series of upwards shallowing parasequences. Understanding shale hosted carbonate intervals through petrographic due diligence provides a sophisticated understanding of depositional conditions and long-term trends.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Minglei Yang, Xinya Yu, Dancheng Zhu, Ke Long, Chaojin Lu, Huayao Zou
Summary: This study investigates the distribution and reservoir characteristics of microbial carbonates in the upper submember of the Middle Triassic Leikoupo Formation in the western Sichuan Basin. It identifies high-quality reservoirs in the central area (regressive microbialites) and northern area (intraclast dolograinstone). The study proposes a depositional framework for microbialites and evaluates its control on reservoir quality, which is significant for further research on microbial carbonate reservoirs.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Viswasanthi Chandra, Alexander Petrovic, Pankaj Khanna, Ahmad I. Ramdani, Bora Yalcin, Volker Vahrenkamp, Thomas Finkbeiner
Summary: This paper presents a comprehensive analysis of multiscale geological, petrophysical and rock mechanical data acquired from 35 m of outcrop well core from the Late Jurassic Upper Jubaila Formation in Saudi Arabia. The study identified four main lithofacies types and discussed factors influencing rock properties and mechanical behavior, such as mineralogy, dedolomitization, and permeability controls. Despite reduced porosity, the compressive rock strength in the outcrop core was found to be lower than that of the subsurface equivalent rocks, indicating overall weakening of the rock due to telogenetic processes and surface weathering.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Aaron J. Martin, Mireia Domenech, Daniel F. Stockli, David Gomez-Gras
Summary: The Upper Triassic to lowest Upper Jurassic strata in north-eastern Mexico record surface processes during the early rifting that led to the opening of the Gulf of Mexico. This study uses detrital zircon U-Pb ages and clast compositions to constrain depositional ages and reconstruct tectonic setting and provenance, indicating deposition in partitioned rift basins receiving sediment from local sources within a distance of approximately 100 km. These data contribute to understanding surface processes during the initial rifting that eventually led to the opening of the Gulf of Mexico.
Article
Geosciences, Multidisciplinary
Piero Gianolla, Marcello Caggiati, Alberto Riva
Summary: The study in the Dolomites reveals detailed relationships between Middle Triassic carbonate systems and volcanic activities, as well as the impact of tectonic movements on the geological system.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geosciences, Multidisciplinary
Mao Luo, Jitao Chen, Wenkun Qie, Jinyuan Huang, Qiyue Zhang, Changyong Zhou, Wen Wen
Summary: This study provides a detailed geobiological characterization of laminated lime mudstone from the Middle Triassic Guanling Formation in Yunnan Province, revealing the crucial role that microbes play in the formation of lime mud, including the formation of nano-globules and microbial communities' impact on alkalinity in the local environment.
JOURNAL OF EARTH SCIENCE
(2021)
Article
Geosciences, Multidisciplinary
Cornelia Rasmussen, Roland Mundil, Randall B. Irmis, Dominique Geisler, George E. Gehrels, Paul E. Olsen, Dennis Kent, Christopher Lepre, Sean T. Kinney, John W. Geissman, William G. Parker
Summary: The Upper Triassic Chinle Formation in Petrified Forest National Park, Arizona, is a significant non-marine archive of biotic and environmental changes, with new age models suggesting a mid-Norian event rather than correlation to the Carnian-Norian boundary. By combining detrital CA-ID-TIMS ages with magnetostratigraphic data, two feasible age model solutions have been proposed, showing the challenges and powers of integrating different dating methods for complex sedimentary sequences.
GEOLOGICAL SOCIETY OF AMERICA BULLETIN
(2021)
Article
Geosciences, Multidisciplinary
Xiangdong Zhao, Wei Wang, Guwei Xie, Songqi Pan, Edmund A. Jarzembowski, Daran Zheng
Summary: The Tongchuan Formation in the Ordos Basin of northwestern China is a typical lacustrine deposit with thick layers of organic-rich shales. Studies suggest that these shales were likely deposited under oxic-dysoxic bottom-water conditions, with a shallow chemocline depth, moderately high sedimentation rate, and high primary productivity playing crucial roles in their formation. The consistent delta S-34(py) values further support the idea of a relatively open environment for the formation of sedimentary pyrite during shale deposition.
GEOLOGICAL JOURNAL
(2021)
Article
Geography, Physical
Ying Xiong, Xiucheng Tan, Shoukang Zhong, Di Xiao, Baobao Wang, Mengying Yang, Wancai Nie, Jian Cao
Summary: This study reports a prolonged period of karstification in the Middle Ordovician carbonate succession of North China and reveals the geochemical evolution at different stages through isotopic and elemental analysis.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Karsten Osenbrueck, Eva Blendinger, Carsten Leven, Hermann Ruegner, Michael Finkel, Natalia Jakus, Hartmut Schulz, Peter Grathwohl
Summary: Nitrate reduction is an important natural mechanism in fractured aquifers, where the porosity of rock matrix and hydraulic conductivity influence the nitrate reduction potential within the aquifer. The study in SW Germany reveals that high-porosity facies and hydraulically active fractures with pyrite or saddle dolomite precipitates are the zones with the highest nitrate reduction potential.
HYDROGEOLOGY JOURNAL
(2022)
Article
Geology
Muhammad Riaz, Arman Jafarian, Ardiansyah Koeshidayatullah, Fabrizio Frontalini, Lei Jiang, Khalid Latif, Tehseen Zafar
Summary: The Cambrian carbonate sequence in North China is globally and regionally significant due to its continuous and thick exposure, providing valuable data on environmental changes and biological events. However, studies on the depositional patterns and geochemical variations of these outcrops are limited. This study integrates fieldwork with petrographic and geochemical analyses to address these issues.
SEDIMENTARY GEOLOGY
(2023)
Article
Geology
Xiaowei Li, Daniel J. Lehrmann, John Luczaj, Brian M. Kelley, Dave L. Cantrell, Meiyi Yu, Nathaniel Ledbetter Ferrill, Jonathan L. Payne
Summary: This study investigates the formation mechanism(s) of dolostone in the Nanpanjiang Basin. It finds that dolostone formation consists of three phases, with the first phase formed by the reflux of platform-top evaporated seawater in the Early Triassic. The second and third phases of dolostone are interpreted to have formed at elevated temperatures during or after Late Triassic platform burial. The study also suggests that the same dolomite sample may retain well-preserved or altered data depending on the specific geochemical proxy used.
SEDIMENTARY GEOLOGY
(2022)
Article
Geology
Heiko Hueneke, M. Arwed Gibb, Oliver Mayer, Jorit F. Kniest, Paul Mehlhorn, Laura M. Gibb, Z. Sarah Aboussalam, R. Thomas Becker, Ahmed El Hassani, Lahssen Baidder
Summary: This study examines bioclastic carbonate contourites that arise from a broad spectrum of sedimentary processes. The result of intermittent sediment accumulation are thin and condensed successions with abundant hiatuses. The study contributes to the understanding of carbonate facies and the pattern of oceanic circulation in the Devonian greenhouse world.
Article
Geosciences, Multidisciplinary
Jiahao Chen, Qingfei Wang, M. Santosh, Long Qiao, Tingyi Wang, Yanning Wang, Qizuan Zhang
Summary: Detrital zircon analysis and thermochronology were conducted to study the plate boundary dynamics and basin sedimentation in the southwestern South China Block. Results indicate different provenances and tectonic events during the Early and Middle Triassic, with the turbidite system being primarily controlled by Palaeo-Pacific subduction in the Early Triassic and experiencing the impact of both Palaeo-Pacific subduction and Indochina Block collision in the Middle Triassic.
GEOLOGICAL JOURNAL
(2023)