Strontium-isotopic geochemistry of fluorite mineralization (Coahuila, Mexico)

Stephen E. Kesler, Joaquin Ruiz, Lois M. Jones

Research output: Contribution to journalArticle

Abstract

The widespread fluorite deposits of Coahuila, Mexico, include limestone replacement deposits formed at the contact with Tertiary rhyolites and microsyenites, as well as mantos and veins that are not clearly associated with any known igneous body. In recent studies, it was concluded that most of the calcium in these deposits came from the limestone, whereas the fluorine was derived largely from the Tertiary igneous rocks. We have tested this model using strontium-isotopic data and simultaneously placed constraints on the mechanisms of fluorite deposition. Our results indicate that the 87Sr/86Sr ratio of the host-limestones ranges from 0.7075 to 0.7078, whereas that of the Tertiary rocks, at the time of mineralization, was 0.7074–0.7118. The 87Sr/86Sr ratios of the fluorite range from 0.7076 to 0.7083. The fluorites fall on two distinct mixing lines between Cretaceous limestone and Tertiary igneous rock. Between 70% and 98% of the Sr in the fluorite came from limestones. Relative abundances of Sr and F in the limestone and the igneous rocks suggest that between 70% and 96% of the fluorine came from the igneous rocks.

Original languageEnglish (US)
Pages (from-to)65-75
Number of pages11
JournalChemical Geology
Volume41
DOIs
StatePublished - 1983
Externally publishedYes

Fingerprint

Strontium
Geochemistry
Fluorspar
Calcium Carbonate
fluorite
strontium
Igneous rocks
geochemistry
limestone
mineralization
igneous rock
Deposits
Fluorine
fluorine
relative abundance
replacement
calcium
Rocks
Cretaceous
Calcium

ASJC Scopus subject areas

  • Geology
  • Geochemistry and Petrology

Cite this

Strontium-isotopic geochemistry of fluorite mineralization (Coahuila, Mexico). / Kesler, Stephen E.; Ruiz, Joaquin; Jones, Lois M.

In: Chemical Geology, Vol. 41, 1983, p. 65-75.

Research output: Contribution to journalArticle

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