Kamphaugite-(Y) from La Cabrera massif, Spain: a low-temperature hydrothermal Y-REE carbonate
| Autor: | J. González del Tánago, A. La Iglesia, A. Delgado |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Calcite
010506 paleontology geography geography.geographical_feature_category Pluton Geochemistry Analytical chemistry Laumontite Massif engineering.material 010502 geochemistry & geophysics 01 natural sciences Hydrothermal circulation chemistry.chemical_compound chemistry Geochemistry and Petrology engineering Carbonate Alkali feldspar Quartz Geology 0105 earth and related environmental sciences |
| Zdroj: | Mineralogical Magazine. 70:397-404 |
| ISSN: | 1471-8022 0026-461X |
| Popis: | Kamphaugite-(Y) occurs as white to cream-coloured spherical to semi-spherical aggregates of radial crystals in the La Cabrera granitic pluton (Spanish Central System). It mainly occurs on the free surfaces of alkali feldspar, quartz, calcite, kainosite-(Y) and laumontite, and inside miarolitic cavities. La Cabrera kamphaugite-(Y) has an average composition of Ca0.94Y0.89REE0.21(CO3)2 [F0.05(OH)0.95]·1.19H2O. Negative δ13CV-PDB values (–14 to –15‰) indicate a meteoric carbon source. Textural relations between kamphaugite-(Y) and coexisting minerals, its relatively high δ18OV-SMOW values (+25 to +26‰), and the occurrence of laumontite inclusions in kamphaugite-(Y), point to a genesis at < 50°C during very low-temperature post-magmatic hydrothermal activity. |
| Databáze: | OpenAIRE |
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