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Kamphaugite-(Y) from La Cabrera massif, Spain: a low-temperature hydrothermal Y-REE carbonate

Published online by Cambridge University Press:  05 July 2018

J. González del Tánago ,
A. La Iglesia  and
A. Delgado
J. González del Tánago*
Affiliation:
Departamento de Petrología y Geoquímica y Instituto de Geología Económica CSIC, Facultad de Ciencias Geológicas, Universidad Complutense, 28040 Madrid, Spain
A. La Iglesia
Affiliation:
Departamento de Petrología y Geoquímica y Instituto de Geología Económica CSIC, Facultad de Ciencias Geológicas, Universidad Complutense, 28040 Madrid, Spain
A. Delgado
Affiliation:
Departmentamento de Ciencias de la Tierra y Química Ambiental, Estación Experimental del Zaidín, CSIC, 18008 Granada, Spain
*
*E-mail: tanago@geo.ucm.es
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Abstract

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.

Keywords

kamphaugite-(Y)stable isotopesSpanish Central System
Type
Editorial
Information
Mineralogical Magazine , Volume 70 , Issue 4 , August 2006 , pp. 397 - 404
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2006

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