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Nature et origine des fluides au sein de deux "metamorphic core complexes" (MCC) : les Apennins du Nord (Italie) et le Shuswap MCC (Canada)

Abstract : Fluid circulation in metamorphic core complex (MCC) were studied in the Apennines Alps (North Italy) and the Shuswap MCC (Canada). The MCC geological structure is characterized by an upper unit juxtaposed with a lower metamorphic unit along a low-angle detachment. The aim of the fluid inclusion study was to determine the nature and pathways of fluids during the late evolution of MCC. Results show the presence of several fluid reservoirs and mixing processes when reservoirs are connected : (i) aqueous-carbonic fluids, with dominant CO2 +- (CH4, N2), and rarely H2S, from a deep origin, typical of fluid-rock interactions in metamorphic formations. (ii) several aqueous fluids, of meteoric or deeper origin, and with variable salinity owing to various degree of interaction with the host rocks. Reconstitution of pressure-temperature conditions during fluid inclusions trapping enables to determine the P-T-x pathway of the different lithotectonic units in late stages of MCC evolution.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2003_0185_JEANNINGROS.pdf
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https://hal.univ-lorraine.fr/tel-01746827
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Submitted on : Thursday, March 29, 2018 - 10:45:35 AM
Last modification on : Wednesday, November 4, 2020 - 1:56:02 PM

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  • HAL Id : tel-01746827, version 1

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Audrey Jeanningros. Nature et origine des fluides au sein de deux "metamorphic core complexes" (MCC) : les Apennins du Nord (Italie) et le Shuswap MCC (Canada). Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2003. Français. ⟨NNT : 2003NAN10185⟩. ⟨tel-01746827⟩

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