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Mineralogical Magazine; August 2006; v. 70; no. 4; p. 397-404; DOI: 10.1180/0026461067040338
© 2006 Mineralogical Society of Great Britain and Ireland
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Kamphaugite-(Y) from La Cabrera massif, Spain: a low-temperature hydrothermal Y-REE carbonate

J. González del Tánago1,*, A. La Iglesia1 and A. Delgado2

1 Departamento de Petrología y Geoquímica y Instituto de Geología Económica CSIC, Facultad de Ciencias Geológicas, Universidad Complutense, 28040 Madrid, Spain
2 Departmentamento de Ciencias de la Tierra y Química Ambiental, Estación Experimental del Zaidín, CSIC, 18008 Granada, Spain

* E-mail: tanago{at}geo.ucm.es

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 {delta}13CV-PDB values (–14 to –15{per thousand}) indicate a meteoric carbon source. Textural relations between kamphaugite-(Y) and coexisting minerals, its relatively high {delta}18OV-SMOW values (+25 to +26{per thousand}), and the occurrence of laumontite inclusions in kamphaugite-(Y), point to a genesis at <50°C during very low-temperature post-magmatic hydrothermal activity.

KEYWORDS: kamphaugite-(Y), stable isotopes, Spanish Central System






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