Diagenetic minerals from saline diapirs as thermodynamic, chemical and isotopic tracers of evolution in the North Tunisi
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ORIGINAL ARTICLE
Diagenetic minerals from saline diapirs as thermodynamic, chemical and isotopic tracers of evolution in the North Tunisian sedimentary basin and their impacts on ore deposits genesis Mohja Dermech1,2 · Abdelkrim Charef3 · Mariem Trifi2,3 Accepted: 28 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract To suggest the impacts of diapir evolutions on the ore deposits genesis, combined mineralogical, Raman spectrometry and C-, O- and H- isotopes studies of fluid inclusions trapped by their minerals were studied. In diapir zone, the evolution of hydrothermal fluids has been distinguished: • type I hot fluids (365 °C) had formation water origin
(δD ≈ − 21‰) and moderate salinity (12–23% wt% eq. NaCl) which were trapped by minerals where Mg/Ca ≥ 1, in particular, magnesite and secondary by dolomite 1. • later, type II fluids less hot which were divided into two members. The first was the N 2-dominant fluids (≈ 250 °C) and more saline (23–43 wt% eq. NaCl and/or KCl) which were trapped in particular by some dolomite 1, dolomite 2 and quartz. The end member was C O2-rich fluids; their trapping temperatures varying from 150 to 270 °C and salinities > 35 wt% eq. NaCl and/or KCl were trapped by minerals where Mg/Ca
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