Results 41 to 50 of about 1,474 (181)

The use of predominance area diagrams (PAD) to determine the oxygen and sulfur fugacities prevailing during historical metallurgical processes: the case of fifteenth to seventeenth century copper slags from Polichno (Old Polish industrial district)

Heritage Science
The study presents the first use of predominance area diagrams (PADs) to determine oxidation–reduction conditions during reconstructing historical copper smelting processes.
Krzysztof Kupczak, Rafał Warchulski, Aleksandra Gawęda, Marta Ślęzak, Piotr Migas   +4 more
doaj   +1 more source

Oxygen fugacity of Alto Paranaíba kimberlites and diamond instability: Três Ranchos IV and Limeira I intrusions

Brazilian Journal of Geology, 2020
Oxygen fugacity (ƒO2) conditions were established for Três Ranchos IV (TR-IV, diamond-bearing) and Limeira I (LM-I, barren) kimberlite intrusions, in Alto Paranaíba Alkaline Province, to constrain a possible correlation between fO2 and diamond ...
Bruna Coldebella, Rogério Guitarrari Azzone, Luanna Chmyz, Excelso Ruberti, Darcy P. Svisero   +4 more
doaj   +1 more source

Redox species and oxygen fugacity of slab-derived fluids: Implications for mantle oxidation and deep carbon-sulfur cycling

Frontiers in Earth Science, 2022
The generation and migration of slab-derived fluids modulate subduction zone seismicity, arc magmatism, and deep volatile cycling. However, the redox species and oxygen fugacity (fO2) (hereafter expressed as log units relative to the fayalite–magnetite ...
Yi-Bing Li, Yi-Bing Li, Yi-Bing Li, Yi Chen, Yi Chen, Yi Chen, Bin Su, Bin Su, Qing-Hua Zhang, Qing-Hua Zhang, Qing-Hua Zhang, Kai-Hui Shi, Kai-Hui Shi, Kai-Hui Shi   +13 more
doaj   +1 more source

Stardust Mine: A 2024 gabbroic shergottite from Arizona, USA

Meteoritics &Planetary Science, EarlyView.
Abstract This study provides an initial characterization of Stardust Mine, a fresh gabbroic enriched shergottite collected in Arizona, USA, in September 2024 and is the first Martian meteorite to be unequivocably collected on US soil. Analysis was conducted on the type specimen and finds that Stardust Mine is composed of equal proportions of pyroxene ...
Jennifer T. Mitchell, Natasha R. Stephen, Zsuzsanna P. Allerton, Weiming Ding, Xin‐Yuan Zheng   +4 more
wiley   +1 more source

Petrogenesis, Redox State, and Mineralization Potential of Triassic Granitoids in the Mengshan District, South China

Frontiers in Earth Science, 2021
The Mengshan district is located in the eastern segment of the Jiangnan Orogen in South China. Multi-phase intrusions were emplaced in this district, with the medium-grained porphyritic biotite granite and its marginal phase (fine-grained porphyritic ...
Yanshen Yang, Yanshen Yang, Xiaofei Pan, Zengqian Hou, Yang Deng, Yongpeng Ouyang, Delei Meng, Tao Xie   +7 more
doaj   +1 more source

Mineralogy, mineral chemistry, and redox equilibria in ten aggregate particles from asteroid Bennu

Meteoritics &Planetary Science, EarlyView.
Abstract Examination of 10 Bennu aggregate particles has revealed the presence of many phases which taken together can provide constraints on the oxygen fugacity (fO2) of Bennu samples. Phyllosilicates (saponite and serpentine), carbonates, oxides (magnetite, chromite), sulfides (pyrrhotite, pentlandite), phosphate (hydroxyapatite, Na‐Mg‐phosphate ...
K. Righter, J. Gorce, L. Le, K. Thomas‐Keprta, Z.E. Wilbur, L.P. Keller, Z. Gainsforth, T.J. McCoy, T.J. Zega, S.S. Russell, H.C. Connolly Jr., D.S. Lauretta   +11 more
wiley   +1 more source

EPMA Analysis of Hydrothermal Biotite from the Bangpu Porphyry Mo-Cu Deposit of Tibet, China and the Characteristics of Early Ore-forming Fluids

Yankuang ceshi, 2016
The chemical composition of hydrothermal biotite is important in revealing the physiochemical conditions and evolution of early ore-forming fluids. The Bangpu deposit is a large porphyry Mo(Cu) deposit in the eastern part of the Gangdese metallogenic ...
WANG Yong, TANG Ju-xing, WANG Li-qiang
doaj   +1 more source

Redox control of the partitioning of platinum and palladium into magmatic sulfide liquids

Communications Earth & Environment
The partitioning behavior of platinum group elements in magmas is critical for their use as tracers of planetary accretion and in understanding magmatic sulfide deposits.
Wanying Wang, Yuan Li
doaj   +1 more source

Determining magmatic series and oxygen fugacity of volcanic rocks in the east of Kamu, north of Isfahan, based on biotite chemistry

Journal of Economic Geology, 2014
Volcanic rocks of interest are situated in the middle part of the Urumieh-Dokhtar Magmatic Arc (UDMA). They are parts of a vast magmatic province located in the north of Bitlis-Zagros suture zone.
Mohammad Sayari, Morteza Sharifi, Jamshid Ahmadian   +2 more
doaj  

Atmospheric Chemistry of Secondary and Hybrid Atmospheres of Super Earths and Sub-Neptunes

The Astrophysical Journal
The atmospheres of small exoplanets likely derive from a combination of geochemical outgassing and primordial gases left over from formation. Secondary atmospheres, such as those of Earth, Mars, and Venus, are sourced by outgassing. Persistent outgassing
Meng Tian, Kevin Heng
doaj   +1 more source