RT Journal Article
T1 Nueva interpretación petrológica y tectónica de las anfibolitas pobres en calcio del antiforme de Arinteiro (NO del Macizo Ibérico). I: Descripción de las anfibolitas pobres en calcio y rocas asociadas
T1 New tectonic and petrologic ¡nterpretation ofa Ca-poor amphibolites occurrence in the Arinteiro antiform (NW Iberian Massif). I: Description ofthe Ca-poor amphibolites and associated rocks
A1 Castiñeiras, Pedro
A1 Gómez Barreiro, Juan
A1 Martínez Catalán, José R.
A1 Arenas, R.
AB Ca-poor amphibolites are characterized by unusual mineral assemblages, and they can be related to different tectonic settings. In this work we describe the amphibolites that outcrop in the Arinteiro massif. In this massif, a great variety of litologies occurs among which amphibolites, garnet-bearing fine-grained amphibolites, Ca-poor amphibolites and calc-silicate rocks are the most abundant. In the first part of the paper we describe the different associations found both in the Ca-poor amphibolites and in the calc-silicate rocks ofthe Arinteiro massif. The mineral chemistry ofthe Ca-poor amphibolites shows a progressive impoverishment in calcium of the different associations. Previous works assigned the origin of this massif to hidrothermal alteration of an ophiolite. However, its structural position over the ophiolitic units, the probable linkage to shear zones and the calcium impoverishment, all point to a different origin for this massif, probably related to fluid circulation in shear zones, as it is proposed in the second part of this paper
PB Sociedad Geológica de España
YR 2002
FD 2002
LK http://hdl.handle.net/10272/9361
UL http://hdl.handle.net/10272/9361
LA spa
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026