TIMING AND SIGNIFICANCE OF CROSSCOURSE MINERALIZATION IN SW ENGLAND

Authors
SCRIVENER RC DARBYSHIRE DPF SHEPHERD TJ
Citation
Rc. Scrivener et al., TIMING AND SIGNIFICANCE OF CROSSCOURSE MINERALIZATION IN SW ENGLAND, Journal of the Geological Society, 151, 1994, pp. 587-590
Citations number
44
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
Journal of the Geological Society → ACNP
ISSN journal
00167649
Volume
151
Year of publication
1994
Part
4
Pages
587 - 590
Database
ISI
SICI code
0016-7649(1994)151:<587:TASOCM>2.0.ZU;2-X
Abstract
Rb-Sr isotope analyses of inclusion fluids from quartz have demonstrat ed a Triassic age (236+/-3 Ma) for N-S-trending Pb-Zn-F vein mineraliz ation in the Tamar Valley district of the Cornubian orefield. Consider ation of the stratigraphy and structure of the Permo-Triassic basins b oth onshore and in the English Channel suggest that this mineralizatio n results from the formation of fractures during regional extension-dr iven subsidence, and the subsequent ingress of basinal brines to the V ariscan basement.