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- W4313332253 abstract "Abstract Hypogene dissolution‐precipitation processes strongly affect the petrophysical properties of carbonate rocks and fluid migration pathways in sedimentary basins. In many deep carbonate reservoirs, hypogene cavernous voids are often associated with silicified horizons. The diagenesis of silica in carbonate sequences is still a poorly‐investigated research topic. Studies exploring the complexity of silica dissolution‐precipitation patterns in hypogene cave analogues are therefore fundamental to unravel the diagenetic and speleogenetic processes that may affect this kind of reservoir. In this work, we investigated an exhumed and silicified Neoproterozoic carbonate sequence in Brazil hosting a 1.4 km‐long cave. Quartz mineralization and silicified textures were analyzed with a multidisciplinary approach combining petrography, fluid inclusion microthermometry, silicon‐oxygen stable isotope analyses and U‐Th‐Pb dating of monazite crystals. We found that an early silicification event caused the replacement of the dolostone layers with micro‐crystalline quartz forming chert nodules. This event was likely associated with mixing fluids (ancient Neoproterozoic seawater and hydrothermal solutions sourced from the underlying Mesoproterozoic basement) at relatively low temperatures (ca. 50–100°C) and shallow depth. After the tectonic deformation produced by the Brasiliano orogeny, silica dissolution was promoted by high temperature and alkaline hydrothermal solutions rising from the quartzite basement along deep‐rooted structures. Hypogene hydrothermal alteration promoted the dissolution of the cherty layers and the precipitation of chalcedony and megaquartz. Homogenization temperatures from primary fluid inclusions in megaquartz cement indicate minimum formation temperatures of 165–210°C. Similar temperature estimates (110–200°C) were obtained from the δ 30 Si and δ 18 O isotope systematics of quartz precipitated from hydrothermal solutions. The dissolved salts in the fluid inclusions were evaluated as NaCl + CaCl 2 from microthermometric data combined with cryogenic Raman spectroscopy, corresponding to salinity ranging between 17 and 25 wt.%. No reliable age constraints for hydrothermal silica dissolution‐precipitation phases were obtained from monazite U‐Th‐Pb dating. However, our results, interpreted in the regional context of the São Francisco Craton, suggest that the Cambrian tectono‐thermal events could have been amongst the possible drivers for this hypogene process in the basin." @default.
- W4313332253 created "2023-01-06" @default.
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- W4313332253 date "2023-01-11" @default.
- W4313332253 modified "2023-10-02" @default.
- W4313332253 title "Hydrothermal silicification and hypogene dissolution of an exhumed Neoproterozoic carbonate sequence in Brazil: Insights from fluid inclusion microthermometry and silicon‐oxygen isotopes" @default.
- W4313332253 cites W1656856957 @default.
- W4313332253 cites W1945611584 @default.
- W4313332253 cites W1964614041 @default.
- W4313332253 cites W1966882459 @default.
- W4313332253 cites W1971592905 @default.
- W4313332253 cites W1971772592 @default.
- W4313332253 cites W1976007995 @default.
- W4313332253 cites W1981184791 @default.
- W4313332253 cites W1983253908 @default.
- W4313332253 cites W1988764950 @default.
- W4313332253 cites W1990825689 @default.
- W4313332253 cites W1991608029 @default.
- W4313332253 cites W1995565182 @default.
- W4313332253 cites W2000352413 @default.
- W4313332253 cites W2004261667 @default.
- W4313332253 cites W2009578314 @default.
- W4313332253 cites W2011490710 @default.
- W4313332253 cites W2012412254 @default.
- W4313332253 cites W2014998992 @default.
- W4313332253 cites W2021755407 @default.
- W4313332253 cites W2026264570 @default.
- W4313332253 cites W2032200127 @default.
- W4313332253 cites W2032281091 @default.
- W4313332253 cites W2034109374 @default.
- W4313332253 cites W2034769266 @default.
- W4313332253 cites W2038281281 @default.
- W4313332253 cites W2050815362 @default.
- W4313332253 cites W2050885917 @default.
- W4313332253 cites W2053678543 @default.
- W4313332253 cites W2069749143 @default.
- W4313332253 cites W2071680290 @default.
- W4313332253 cites W2076263125 @default.
- W4313332253 cites W2076686407 @default.
- W4313332253 cites W2076880629 @default.
- W4313332253 cites W2078817169 @default.
- W4313332253 cites W2078951920 @default.
- W4313332253 cites W2088644964 @default.
- W4313332253 cites W2090757504 @default.
- W4313332253 cites W2092086610 @default.
- W4313332253 cites W2093042212 @default.
- W4313332253 cites W2093983309 @default.
- W4313332253 cites W2094043196 @default.
- W4313332253 cites W2100918471 @default.
- W4313332253 cites W2118969316 @default.
- W4313332253 cites W2124218304 @default.
- W4313332253 cites W2138050805 @default.
- W4313332253 cites W2139095951 @default.
- W4313332253 cites W2143047176 @default.
- W4313332253 cites W2158018102 @default.
- W4313332253 cites W2163394313 @default.
- W4313332253 cites W2167003868 @default.
- W4313332253 cites W2195127322 @default.
- W4313332253 cites W2196345815 @default.
- W4313332253 cites W2213705944 @default.
- W4313332253 cites W2253648104 @default.
- W4313332253 cites W2315126041 @default.
- W4313332253 cites W2323182339 @default.
- W4313332253 cites W2328586320 @default.
- W4313332253 cites W2340354744 @default.
- W4313332253 cites W2485834274 @default.
- W4313332253 cites W2559788309 @default.
- W4313332253 cites W2581221161 @default.
- W4313332253 cites W2586753022 @default.
- W4313332253 cites W2610695639 @default.
- W4313332253 cites W2623113830 @default.
- W4313332253 cites W2721850940 @default.
- W4313332253 cites W2747382975 @default.
- W4313332253 cites W2765346326 @default.
- W4313332253 cites W2792615097 @default.
- W4313332253 cites W2796362827 @default.
- W4313332253 cites W2884710789 @default.
- W4313332253 cites W2885523754 @default.
- W4313332253 cites W2899102070 @default.
- W4313332253 cites W2900157302 @default.
- W4313332253 cites W2902866953 @default.
- W4313332253 cites W2913387978 @default.
- W4313332253 cites W2958107594 @default.
- W4313332253 cites W2978188873 @default.
- W4313332253 cites W2982223832 @default.
- W4313332253 cites W2991366864 @default.
- W4313332253 cites W2998433792 @default.
- W4313332253 cites W3089927857 @default.