Fluid inclusion and isotopic constraints for fluid evolution in the Ordovician veins in Central Tarim, NW China

C. Cai*, K. Li, H. Li, G. Wu

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

    2 Citations (Scopus)

    Abstract

    Barite, anhydrite, fluorite, calcite and quartz are found filling factures in Central Tarim. Modern brines have δ 18O values from -1.5 to +1.4%, and 87Sr/ 86Sr from 0.71026 to 0.71109. Hydrothermal barite veins show an average δ 18O value of 12.0% and precipitated at ∼142°C from a solution with a δ 18O of ∼1.80% and a 87Sr/ 86Sr of ∼0.7090. Subsequently, the solution was cooled by mixing with meteoric water, resulting in a δ 18O of -1.60%. Anhydrite and fluorite veins have lower homogenization temperatures and show much higher 87Sr/ 86Sr ratios (0.70912 to 0.71036) than barite and bulk limestone, but are closer in composition to modern brines, suggesting more radiogenic Sr contribution from clastic rocks in the west to the Central Tarim during cooling. Calcite veins were precipitated under a wide temperature range and show variable 87Sr/ 86Sr ratios. Quartz veins were likely not in oxygen isotopic equilibrium with the mineralizing fluid.

    Original languageEnglish
    Title of host publicationWater-Rock Interaction - Proceedings of the 12th International Symposium on Water-Rock Interaction, WRI-12
    Place of PublicationLondon
    PublisherTaylor & Francis
    Pages703-707
    Number of pages5
    Volume1
    ISBN (Print)9780415451352
    Publication statusPublished - 2007
    Event12th International Symposium on Water-Rock Interaction, WRI-12 - Kunming, China
    Duration: 31 Jul 20074 Aug 2007

    Other

    Other12th International Symposium on Water-Rock Interaction, WRI-12
    CountryChina
    CityKunming
    Period31/07/074/08/07

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