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Geochimica et Cosmochimica Acta
IF
4.26
Papers
23151
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#1Zhen Tian (WashU: Washington University in St. Louis)H-Index: 1
#2Bradley L. Jolliff (WashU: Washington University in St. Louis)H-Index: 50
Last. Kun Wang (WashU: Washington University in St. Louis)H-Index: 15
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Abstract The Moon is depleted in water and other volatiles compared to Earth and the bulk solar composition. Such depletion of volatile elements and the stable isotope fractionations of these elements can be used to better understand the origin and early differentiation history of the Moon. In this study, we focus on the moderately volatile element, potassium, and we report the K elemental abundances and isotopic compositions (δ41K relative to NIST SRM 3141a) for nineteen Apollo lunar rocks and ...
2 CitationsSource
#1Yuan-Can Ying (China University of Geosciences)H-Index: 2
#2Wei Chen (China University of Geosciences)H-Index: 8
Last. Kui-Dong Zhao (China University of Geosciences)H-Index: 26
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Abstract A majority of carbonatite-related rare earth element (REE) deposits are found in cratonic margins and orogenic belts, and metasomatic/hydrothermal reworking is common in these deposits; however, the role of metasomatic processes involved in their formation remains unclear. Here, we present a comprehensive in situ chemical and isotopic (C-Sr) investigation of calcite and fluorapatite within the Miaoya carbonatite complex located in the South Qinling orogenic belt, with the aim to better ...
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Abstract Tectonically active high relief areas are proposed to have a substantial impact on climate regulation throughout the Cenozoic. Here, we present lithium (Li) isotope data of the dissolved load and suspended particulate material from the basins of the Yalong River and the Jinsha River, which drain the high-relief borders of the eastern Tibetan Plateau and constitute the headwaters of the Yangtze River. Dissolved δ7Li values are relatively low and constant in the Jinsha River mainstream (+...
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#1Céline Pallud (University of California, Berkeley)H-Index: 12
#1C. P. PalludH-Index: 2
Last. Thomas BorchH-Index: 25
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Abstract Concentrations of dissolved organic carbon (DOC) in surface waters have rapidly increased across Europe and North America over the past few decades. The causes for such trends have yet to be fully understood, although several factors including elevated temperatures and decreased atmospheric deposition of acid, nitrogen and sulfur, are considered responsible for the release of carbon from soils into streams. In order to determine how seasonal temperature patterns and soil physical and ch...
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#1Nikolay N. Akinfiev (RAS: Russian Academy of Sciences)H-Index: 11
#2V. S. Korzhinskaya (RAS: Russian Academy of Sciences)H-Index: 2
Last. Alexander V. Zotov (RAS: Russian Academy of Sciences)H-Index: 3
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Abstract Available experimental data on the solubility of β -Nb2O5 and β -Ta2O5 in the Nb–O–H–F and Ta–O–H–F systems were critically evaluated, and the thermodynamic properties of hydroxide and hydroxofluoride complexes were estimated in a wide range of temperatures (0 - 600 °C) and pressures (1 – 3000 bar). In near neutral pH solutions, the solubility of the oxides is governed by uncharged aqueous hydroxides, Nb(OH)5 and Ta(OH)5, and is rather low even at high temperatures (1 – 9 ppm for Nb and...
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#1Alina FiedrichH-Index: 1
#2Oscar LaurentH-Index: 11
Last. Olivier BachmannH-Index: 42
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Abstract Pre- to syn-eruptive fluids released by the magmatic system forming the non-welded rhyolitic Kos Plateau Tuff ignimbrite, Greece, were characterized using fluid inclusions entrapped in quartz from granitic clasts entrained from the roof or walls of the feeding magma reservoir. This fluid was initially of intermediate density and relatively low salinity (3-11 wt% NaClequivalent). Following significant pressure drop(s), it separated into immiscible brine and CO2-bearing vapor occurring as...
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#1S. Escario (U of C: University of Calgary)
#2Michael Nightingale (U of C: University of Calgary)H-Index: 11
Last. Benjamin M. Tutolo (U of C: University of Calgary)H-Index: 13
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Abstract Pore-filling and carbonate-replacing silica is exceedingly common in carbonates, but the fundamental geochemical mechanisms that drive these silicification reactions during diagenesis remain poorly understood. An existing model has proposed that carbonate silicification proceeds through an interface-coupled dissolution-precipitation reaction, but it lacks a mechanism that enables pore fluids to reach the requisite level of supersaturation with respect to silica to allow nucleation and g...
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#1Zhong-Jie Bai (CAS: Chinese Academy of Sciences)H-Index: 10
#2Hong Zhong (CAS: Chinese Academy of Sciences)H-Index: 27
Last. Wei-Guang Zhu (CAS: Chinese Academy of Sciences)H-Index: 15
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Abstract It is widely considered that arc magmas are highly oxidized, and can thus dissolve a large amount of sulfur, thereby preventing significant sulfide saturation prior to fluid saturation. Therefore, chalcophile metals (e.g., Cu and Au) are retained in the magma and finally extracted by exsolved hydrothermal fluids. To test this hypothesis, we analyzed the abundances of platinum-group elements (PGEs) in a suite of arc volcanic rocks, which are the extrusive counterparts of magmas associate...
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Abstract In continental volcanic settings, abundant carbonate precipitation can occur with atypical facies compared to marine settings. The (bio-)chemical processes responsible for their development and early diagenesis are typically complex and not fully understood. In the Bolivian Altiplano, Laguna Pastos Grandes hosts a 40-km2 carbonate platform with a great diversity of facies and provides an ideal natural laboratory to understand the processes responsible for the precipitation of carbonates...
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#1Qi-Wei Li (CAS: Chinese Academy of Sciences)
#2Jun-Hong Zhao (China University of Geosciences)
Last. Yu-Ting He (CAS: Chinese Academy of Sciences)
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Abstract Mafic magmatism within deep crustal hot zones plays an important role in the crustal formation and evolution. High-pressure garnet crystallization drives magma differentiation and Fe isotope fractionation at the base of the lower crust. The ∼840 Ma intrusion and the associated ∼830 Ma dikes from the Tongde region in South China consist mainly of gabbro and diorite, which record complicated magmatic processes of the deep crustal zones and provide new insights into the Fe isotope fraction...
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