Ocean floor hydrothermal veins in eclogite facies rocks of the Zermatt-Saas Zone, Switzerland

Authors
Widmer, T Ganguin, J Thompson, AB
Citation
T. Widmer et al., Ocean floor hydrothermal veins in eclogite facies rocks of the Zermatt-Saas Zone, Switzerland, SCHWEIZ MIN, 80(1), 2000, pp. 63-73
Citations number
48
Categorie Soggetti
Earth Sciences
Journal title
SCHWEIZERISCHE MINERALOGISCHE UND PETROGRAPHISCHE MITTEILUNGEN
ISSN journal
00367699 → ACNP
Volume
80
Issue
1
Year of publication
2000
Pages
63 - 73
Database
ISI
SICI code
0036-7699(2000)80:1<63:OFHVIE>2.0.ZU;2-6
Abstract
Mg-rich. irregular Sarnet-chloritoid-talc veins and schists occur in the ec logites of the ZS-Zone. This metamorphic assemblage formed during subductio n at pressures of at least 20 kbar. They are interpreted as former oceanic hydrothermal veins and show similarities with smectite-chlorite veins of oc ean drilling cores (e.g. ODP hole 504B) produced during metasomatic alterat ion of ocean floor basalt by seawater.