A reconnaissance Rb-Sr, Sm-Nd, U-Pb, and K-Ar study of some host rocks and ore minerals in the West Shasta Cu-Zn district, California

Autor:	R. W. Kistler, Robert E. Zartman, Edwin H. McKee, K. Futa, Z. E. Peterman
Rok vydání:	1985
Předmět:	Mineralization (geology) Geophysics Geochemistry and Petrology Rhyolite Geochemistry Economic Geology Geology Seawater Pelagic sediment Devonian
Zdroj:	Economic Geology. 80:2128-2135
ISSN:	1554-0774 0361-0128
DOI:	10.2113/gsecongeo.80.8.2128
Popis:	The Copley Greenstone, Balaklala Rhyolite, and Mule Mountain stock in the West Shasta Cu-Zn district, California, have Rb-Sr, Sm-Nd, U-Pb, and K-Ar systematics that indicate they are a cogenetic suite of ensimatic island-arc rocks about 400 m.y. Pervasive alteration and mineralization of these rocks, for the most part, was syngenetic and the major component of the mineralizing fluid was Devonian seawater. K-Ar ages of quartz-sericite concentrates from ore horizons and Rb-Sr systematics of a few rock and ore specimens record a later thermal and mineralizing event in the district of about 260 m.y. Contamination of some rocks with pelagic sediments is indicated by the Sm-Nd data.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9d53c8163e2df6b635a828b4ddadb9ee https://doi.org/10.2113/gsecongeo.80.8.2128 Zobrazit plný text záznamu