Journal ArticleDOI
The Cornubian batholith, SW England: D/H and 18O/16O studies of kaolinite and other alteration minerals
TLDR
In this paper, D/H and 18 O/16 O ratios were determined on minerals and whole-rock samples of fresh granites, granites altered during greisenization and kaolinization of the Hercynian Cornubian batholith, detrital kaolinitic sediments of the Bovey Formation, and modern meteoric waters.Abstract:
D/H and 18 O/ 16 O ratios were determined on minerals and whole-rock samples of fresh granites, granites altered during greisenization and kaolinization of the Hercynian Cornubian batholith, detrital kaolinitic sediments of the Bovey Formation, and modern meteoric waters. The granites are high −18 O rocks with δ 18 O = 10.8 to 13.2‰ due to melting, assimilation and/or exchange with argillaceous-rich metasediments at depth. Vein-controlled greisening was dominated by meteoric-hydrothermal fluids, Kaolinites from the major china clay deposits are of weathering origin. They are isotopically consistent with having formed in a tropical to warm temperature climate during the Cretaceous-Tertiary. Although intense supergene kaolinization was probably localized by earlier post-magmatic processes, there is no evidence that china clay kaolinites originally formed during hydrothermal activity and subsequently underwent post-formational isotopic exchange.read more
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Quantitative paleoenvironmental and paleoclimatic reconstruction using paleosols
Nathan D. Sheldon,Neil J. Tabor +1 more
TL;DR: Paleosols (fossil soils) are preserved throughout the geologic record in depositional settings ranging from alluvial systems to between basalt flows as mentioned in this paper, and a variety of semi-quantitative and quantitative tools have been developed to examine past weathering and pedogenesis, and to reconstruct both paleoenvironmental and paleoclimatic conditions at the time that the paleosols formed.
Journal ArticleDOI
Stable isotope geochemistry of clay minerals; The story of sloppy, sticky, lumpy and tough, Cairns-Smith (1971)
S. M. F. Sheppard,H. A. Gilg +1 more
TL;DR: The equilibrium H- and O-isotope fractionation of clays can be approximated by the following equations which are based on experimental, empirical and/or theoretical data.
Journal ArticleDOI
Manaslu leucogranite: A collision signature of the Himalaya: A model for its genesis and emplacement
TL;DR: The Manaslu pluton is one of 10 leucogranites that formed in the overthrusted Higher Himalaya after the Indo-Eurasian collision.
Journal ArticleDOI
The “chessboard” classification scheme of mineral deposits: Mineralogy and geology from aluminum to zirconium
TL;DR: In this article, the authors used the concept of a "chessboard" to classify mineral resources in the mixtum compositum of all geoscientific disciplines focused on one goal, finding new mineral depsosits and enhancing their exploitation.
Journal ArticleDOI
Rare earth element mobility during granite alteration: Evidence from southwest England
TL;DR: In this paper, the rare earth elements (REE) were potentially mobile during hydrothermal and supergene alteration of granitic rocks from southwest England, and they were removed from the system during K-silicate alteration, Eu was lost during sericitic alteration, all REE were lost during tourmalinization, and light and argillic alteration.
References
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Journal ArticleDOI
Stable isotopes in precipitation
TL;DR: In this paper, the isotopic fractionation of water in simple condensation-evaporation processes is considered quantitatively on the basis of the fractionation factors given in section 1.2.
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Isotopic Variations in Meteoric Waters
TL;DR: The relationship between deuterium and oxygen-18 concentrations in natural meteoric waters from many parts of the world has been determined with a mass spectrometer and shows a linear correlation over the entire range for waters which have not undergone excessive evaporation.
Journal ArticleDOI
Variation of O18 content of waters from natural sources
S Epstein,Toshiko K. Mayeda +1 more
TL;DR: A number of marine water and fresh water samples were examined for the relative O18O16 ratio, and the variation of this ratio was determined to a precision of ± 1% as mentioned in this paper.
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The use of bromine pentafluoride in the extraction of oxygen from oxides and silicates for isotopic analysis
TL;DR: In this paper, a technique was developed in which bromine pentafluoride was used as a reagent for quantitative liberation of oxygen from oxides and silicates, and the results of isotopic analyses were compared with measurements made in other laboratories by other procedures.
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Geochemistry of Hydrothermal Ore Deposits
TL;DR: In this paper, Skinner et al. discuss the relationship between hydrous alteration and its relationship to hydrous fluid composition in the formation of sulfide-sulfide ores.