4.1 Article

U-PB DATING AND GEOCHEMICAL CONSTRAINTS TO EARLY CRETACEOUS HYDROTHERMAL DOLOMITIZATION IN THE PROVENCAL DOMAIN (MARITIME ALPS, NW ITALY - SE FRANCE)

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OFIOLITI
卷 46, 期 2, 页码 -

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OFIOLITI
DOI: 10.4454/ofioliti.v46i2.543

关键词

hydrothermal dolomitization; U-Pb carbonate datings; Early Cretaceous; Provencal Domain; Maritime Alps

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资金

  1. University of Torino
  2. CNR-IGG (National Research Council of Italy, Institute of Geosciences and Earth Resources, Torino unit)
  3. International Association of Sedimentologists (IAS Grant Scheme Award, 2nd session 2012)

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In the Maritime Alps, the carbonate rocks of the Provencal Domain underwent intense hydrothermal dolomitization, which was the result of large-scale hydrothermal circulation related to deep faults. New carbonate U-Pb dating and geochemical analysis provided insights into the timing and mechanisms of the hydrothermal circulation.
In the Maritime Alps (NW Italy - SE France), the Middle Triassic-Berriasian platform carbonates of the Provencal Domain are locally affected by an intense hydrothermal dolomitization. This dolomitization resulted from a large-scale hydrothermal circulation related to deep-rooted faults, and is indirect evidence of a significant earliest Cretaceous fault activity in this part of the Alpine Tethys European palaeomargin. New carbonate U-Pb dating and geochemical (stable isotope and noble gases on inclusion-hosted water, Sr-87/Sr-86, clumped isotopes) data allowed a better understanding of the timing and mechanisms of the hydrothermal circulation. Hydrothermal fluids probably originated from seawater, which was involved in a deep circulation within the underlying crystalline basement, undergoing heating to more than 200 degrees C and substantial compositional modification by prolonged interaction with basement rocks. Thin cement rims rich in carbonaceous material, locally alternated with hydrothermal dolomite cements, are interpreted as remnants of ephemeral microbial communities that could colonize the upper part of hydrothermal conduits, during periods of reduced hot fluid flow and contemporaneous downward seawater infiltration.

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