Article
Geochemistry & Geophysics
Joana Filipa Vieira Duarte, Thomas Pettke, Jorg Hermann, Francesca Piccoli
Summary: Oxide minerals in ultramafic rocks can be used to assess the redox conditions of the rock and fluids during subduction. Previous studies have focused on the dominancy of magnetite, but the fate of magnetite and other oxides at higher pressure and temperature conditions is not well understood. This study investigates mineral assemblages in metaperidotites beyond antigorite-out reactions and identifies two scenarios with different redox conditions. The results provide insights into the behavior of oxides and sulfides in subduction zones.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Multidisciplinary Sciences
Yu Wang, Stephen F. Foley, Stephan Buhres, Jeremie Soldner, Yigang Xu
Summary: Potassium-rich volcanism occurring throughout the Alpine-Himalayan belt from Spain to Tibet is characterized by unusually high Th/La ratios, which may be attributed to a new mantle lithosphere formed only 20 to 50 million years earlier at shallow depths without deep subduction of continental materials. This mechanism is consistent with a temporal trend in Th/La in potassic postcollisional magmas, indicating shallow sources in accretionary settings.
Article
Multidisciplinary Sciences
Mouadh Addassi, Abdirizak Omar, Hussein Hoteit, Abdulkader M. Afifi, Serguey Arkadakskiy, Zeyad T. Ahmed, Noushad Kunnummal, Sigurdur R. Gislason, Eric H. Oelkers
Summary: To attenuate global warming, it is necessary to accelerate carbon capture and storage projects. This study evaluated the feasibility and limitations of injecting water-dissolved CO2 for subsurface solubility storage. The results suggest that unconfined aquifers could be a potential host for substantial subsurface CO2 storage.
SCIENTIFIC REPORTS
(2022)
Article
Energy & Fuels
Shengyin Zhang, Ming Shao, Tao Wang, Yu Pei, Bo Chen
Summary: This study investigates the formation mechanism of carbonate-rich deposits and their linkage with the uplift of the Tibetan Plateau through the analysis of carbonate-rich cores from the Upper Youshashan Formation in the Qaidam Basin. The results show that carbonate minerals consist mainly of Fe-dolomite and calcite and are positively correlated with the carbonate oxygen isotope value. Chemical weathering, aquatic organism burgeoning, and lake alkalinization promote the widespread precipitation of carbonate rocks in the study area. Sulfate-reducing bacteria play a key role in the genesis of lacustrine dolomite.
INTERNATIONAL JOURNAL OF COAL GEOLOGY
(2023)
Article
Geochemistry & Geophysics
Dipak C. Pal, Eileena Das, Ayan Sasmal, Subhadip Adak, Kumar Abhinay
Summary: Hydrothermal iron-oxide-copper-gold (IOCG) deposits are important exploration targets containing multiple economically important metals. Sodium metasomatism is widely found in IOCG provinces, and the formation of albite-rich rocks in these terranes is still debated. This study focuses on the Singhbhum IOCG province in India, which is known for its polymetallic deposits. Through analysis of tourmaline, it is proposed that the albite schist in this province is the product of sodium metasomatism by brines derived from marine evaporites. Similar mechanisms may also be important in the formation of albite-rich rocks in other IOCG provinces.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Geosciences, Multidisciplinary
Wei Xu, Roberto F. F. Weinberg, Shi-Hong Tian, Zeng-Qian Hou, Zhu-Sen Yang, Lu Chen, Feng Lai
Summary: We studied geochemical data of Late Eocene volcanic rocks (including K-rich adakite-like rocks) from the southern Qiangtang terrane in central Tibet. The volcanic rocks show a continuous compositional range from high-K alkaline basalt to high-K calc-alkaline rhyolite, and have a narrow range of depleted Sr-Nd isotopic compositions compared to the pre-Eocene SQT crust. We propose that the KARs in the SQT formed through fractional crystallization of hydrous, alkaline melts derived from the lithospheric mantle, with amphibole and plagioclase dominating the fractionation process. Partial melting of the lithospheric mantle beneath the SQT may have been triggered by thermal perturbations caused by north-directed subduction of the Indian continental lithosphere beneath southern Tibet.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Energy & Fuels
Amer Alanazi, Hussein Rasool Abid, Muhammad Usman, Muhammad Ali, Alireza Keshavarz, Volker Vahrenkamp, Stefan Iglauer, Hussein Hoteit
Summary: This study thoroughly investigated the storage efficiency of hydrogen (H2) and the selectivity of cushion gases (CO2 and CH4) in organic-rich carbonate-rich Jordanian source rock samples. Results showed that organic residuals significantly influenced H2 storage efficiency and CO2 demonstrated preferential behavior as a cushion gas compared to CH4. This study provides fundamental data for understanding H2 potential storage issues in an organic-rich rock formation and aids in the industrial implementation of an H2 supply chain.
Article
Materials Science, Multidisciplinary
Sony Sukmara, Suyanti, Wisnu Ari Adi, Azwar Manaf
Summary: The study analyzed ilmenite rock from Pandeglang regency to identify its composition and mineral phases, providing a foundation for exploring titanium minerals and increasing local income.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Environmental Sciences
Roi Roded, Einat Aharonov, Amos Frumkin, Nurit Weber, Boaz Lazar, Piotr Szymczak
Summary: Karst systems are widely found in carbonate formations and play a crucial role in global water supply. A significant portion of karst formations is likely formed by underground water ascending from depth. The exact mechanism of formation remains unclear. Numerical simulations show that cooling of carbon dioxide-rich geothermal fluids can dissolve and shape large caves on short geological timescales.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Geosciences, Multidisciplinary
Wenren Zeng, Zhihuan Zhang, Boran Wang, Xuan Chen, Ruihui Zheng, Guobin Fu, Ying Jin
Summary: This study reveals the formation mechanism of organic-rich mixed sedimentary rocks in the Jimsar Sag, Junggar Basin. The results show that changes in paleoclimatic conditions and periodic hydrothermal activity controlled the formation of different lithologies, with high primary productivity and good preservation conditions promoting the accumulation of organic matter in these rocks.
MARINE AND PETROLEUM GEOLOGY
(2023)
Article
Multidisciplinary Sciences
Ceth W. Parker, John M. Senko, Augusto S. Auler, Ira D. Sasowsky, Frederik Schulz, Tanja Woyke, Hazel A. Barton
Summary: Microbially-mediated reductive Fe(III) dissolution transforms poorly soluble Fe(III) phases into soluble Fe(II), leading to mass separation and wall collapse behind cave walls, ultimately forming the cave void. This novel mechanism of speleogenesis may explain BIF dissolution and REE enrichment, and also identify a previously overlooked source of continental Fe.
SCIENTIFIC REPORTS
(2022)
Article
Geochemistry & Geophysics
Nolwenn Coint, Eduardo T. Mansur, Jakob K. Keiding, Oyvind Skar
Summary: This study investigates the formation of Fe-Ti-P- (+/- Zr)-rich rocks and nelsonite by analyzing the trace element content of ilmenite, titanomagnetite, and apatite. It suggests that both fractional crystallization and silicate-liquid immiscibility contribute to the accumulation of mafic minerals in the Raftsund intrusion. The study also finds that the liquid immiscibility process is responsible for the formation of nelsonite, and the Fe-rich melt from which the Fe-Ti oxides crystallized was more enriched in trace elements than the rest of the intrusion.
Article
Geochemistry & Geophysics
Satoru Yamamoto, Hiroshi Nagaoka, Makiko Ohtake, Masahiro Kayama, Yuzuru Karouji, Yoshiaki Ishihara, Junichi Haruyama
Summary: We studied the composition of the lunar mantle by analyzing low-Ca pyroxene (LCP)-rich and olivine-rich rocks on the lunar surface. Data mining with SELENE (Kaguya) hyperspectral data revealed 531 sites dominated by LCP-rich minerals, mainly located in the Imbrium basin and South Pole-Aitken basin. Stratigraphic analysis showed that LCP-rich rocks are exposed on fresh geological features less affected by space-weathering. The distribution of LCP-rich bodies in impact basins suggests a variation in mantle composition.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Geosciences, Multidisciplinary
Radmila Nahodilova, Jaroslav Rihosek, Tadeas Hajek
Summary: The Janoch locality near the Temelin nuclear power plant in the South Bohemian Region of the Czech Republic was chosen as a suitable deep radioactive waste depository. Extensive geological, geochemical, geophysical, and hydrological studies were conducted to define the potential repository area and identify homogeneous blocks. The presence of karst features in the Moldanubian domain is mainly attributed to corrosion caused by chemically aggressive water in permeable marbles.
ZEITSCHRIFT DER DEUTSCHEN GESELLSCHAFT FUR GEOWISSENSCHAFTEN
(2023)
Article
Geochemistry & Geophysics
Cong Yu, Bin Zhang, Songtao Wu, Guoyi Hu
Summary: In this study, thermal simulation experiments, isotopic analysis, and fluid inclusion determination were conducted to investigate the relationship between gas generation in coal-measure source rocks and reservoir densification. It was found that CO2 produced by coal-measure source rocks can promote the formation of cement in tight sandstone reservoirs, which has significant implications for carbon capture and storage.
INTERPRETATION-A JOURNAL OF SUBSURFACE CHARACTERIZATION
(2022)