Overheated, Cu-bearing magmas in Zaldivar Porphyry Copper Deposit, Northern Chile: Geodinamic evidence

E. drs Campos, J.L.R. Touret, I. Nikogosian, J. Delgado, P. Morales

    Research output: Contribution to JournalArticleAcademicpeer-review

    Abstract

    The Zaldivar porphyry copper deposit, Northern Chile, consists of two major intrusions, the 290 Ma Zaldivar, and the more recent Miocene (38.7 Ma) Llamo porphyry. Five types of inclusions have been identified in quartz phenocrysts from Llamo porphyry, including melt inclusions (M), and four types of fluid inclusions, called MS (multi solids), B (brines), G (vapor-rich) and W (aqueous), respectively. Melt remnants, well preserved as M-inclusions, homogenize around 1000 °C. They show a rhyolitic composition, comparable to the most evolved acidic rhyolitic end member found elsewhere in the regional magmatism and to worldwide volcanic rhyolitic glass. High silica content in some inclusions can, however, be due to partial remelting of the quartz host during the heating run. Cooper content in the same inclusions ranges between 0.03 and 0.57 wt.%, with an average concentration of 0.10 wt.%, suggesting a major magmatic source for the copper (orthomagmatic model). MS inclusions, which contain a number of solids at room temperature, mostly H
    Original languageEnglish
    Pages (from-to)229-251
    JournalTectonophysics
    Volume345
    DOIs
    Publication statusPublished - 2002

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