Hydrogen in spessartine-almandine garnets as a tracer of granitic pegmatite evolution
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Elizabeth H. Arredondo
,
George R. Rossman
Abstract
The hydroxide contents of spessartine-almandine garnets from the Rutherford no. 2 (Virginia), Himalaya (California), and George Ashley Block (California) pegmatites were determined by infrared spectroscopy. The hydroxide content of garnet increases from the wall zone to the core zone of the Rutherford no. 2 and Himalaya pegmatites, consistent with increasing H2O activity during pegmatite crystallization. However, the absolute OH contents differ by about two orders of magnitude for these two suites of garnets, possibly due to the elevated Ca content of the Rutherford no. 2 and the differences in the depth of emplacement. The garnets from the George Ashley Block show significant excursions from this correlation at the positions within the pegmatite where Kleck and Foord (1999) identified disruptions in major- and minor-element trends that they associated with re-injections of magma and subsequent flushing of the dike system. Ease of measurement as well as a relative amplified sensitivity compared to the Mn and Fe trends, make hydrogen an excellent tracer for the evolution of granitic pegmatites.
© 2015 by Walter de Gruyter Berlin/Boston
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- Some mineral physics constraints on the rheology and geothermal structure of Earth’s lower mantle
- Biodurability of talc
- Microbial biomineralization in weathered volcanic ash deposit and formation of biogenic minerals by experimental incubation
- In situ atomic force microscopy study of hectorite and nontronite dissolution: Implications for phyllosilicate edge surface structures and dissolution mechanisms
- Na- and Cs-exchange in a clinoptilolite-rich rock: Analysis of the outgoing cations in solution
- The effects of time, temperature, and concentration on Sr2+ exchange in clinoptilolite in aqueous solutions
- Thermodynamics of ion-exchanged and natural clinoptilolite
- Thermochemical study of calcium zeolites–heulandite and stilbite
- Fe3+/ΣFe vs. FeLα peak energy for minerals and glasses: Recent advances with the electron microprobe
- Fibrous nanoinclusions in massive rose quartz: The origin of rose coloration
- Cathodoluminescence study of apatite crystals
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- Ab initio studies of possible fluorine-bearing four- and fivefold coordinated Al species in aluminosilicate glasses
- The nature of radiohaloes in biotite: Experimental studies and modeling
- Boron metasomatism of the Alta stock contact aureole, Utah: Evidence from borates, mineral chemistry, and geochemistry
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