COOKEITE AND PYROPHYLLITE IN THE DAUPHINO IS BLACK SHALES (ISERE, FRANCE) - IMPLICATIONS FOR THE CONDITIONS OF METAMORPHISM IN THE ALPINE EXTERNAL ZONES

Authors
JULLIEN M GOFFE B
Citation
M. Jullien et B. Goffe, COOKEITE AND PYROPHYLLITE IN THE DAUPHINO IS BLACK SHALES (ISERE, FRANCE) - IMPLICATIONS FOR THE CONDITIONS OF METAMORPHISM IN THE ALPINE EXTERNAL ZONES, Schweizerische Mineralogische und Petrographische Mitteilungen, 73(3), 1993, pp. 357-363
Citations number
NO
Categorie Soggetti
Mineralogy,Geology
Journal title
Schweizerische Mineralogische und Petrographische Mitteilungen → ACNP
ISSN journal
00367699
Volume
73
Issue
3
Year of publication
1993
Pages
357 - 363
Database
ISI
SICI code
0036-7699(1993)73:3<357:CAPITD>2.0.ZU;2-R
Abstract
The discovery of many new cookeite and pyrophyllite occurrences in the Aalanian black shales from the Dauphinois internal zone, French weste rn Alps, points to Alpine metamorphic conditions between 1 and 5 kbar and from 270 to 340-degrees-C for the external area. These conditions correspond to the culmination of a prograde metamorphic history which has never left the greenschist facies. The cookeite distribution stric tly limited to the Aalenian schist suggests the original presence of l ithium in the sediment.