Are fluid inclusions in gypsum reliable paleoenvironmental indicators? An assessment of the evidence from the Messinian evaporites
| العنوان: | Are fluid inclusions in gypsum reliable paleoenvironmental indicators? An assessment of the evidence from the Messinian evaporites |
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| المؤلفون: | Bigi, D., Lugli, S., Manzi, V., Roveri, M. |
| المصدر: | Geology. 50:454-459 |
| بيانات النشر: | Geological Society of America, 2022. |
| سنة النشر: | 2022 |
| مصطلحات موضوعية: | fluid inclusions, Messinian salinity crisis, Geology, Gypsum, fluid inclusions, Messinian salinity crisis, Gypsum |
| الوصف: | The paleosalinity of water from which the gypsum precipitated during the Messinian salinity crisis is a controversial issue. Recent microthermometry studies on primary fluid inclusions in gypsum provided very low salinity values not compatible with precipitation from seawater, and suggested strong mixing between seawater and nonmarine waters enriched in calcium sulfate. We applied a new microthermometric protocol on gypsum crystals from nine Mediterranean sections that were experimentally stretched to measure a larger population of fluid inclusions. The results show salinities ranging from 9 to 238 wt‰ NaCl equivalent, largely falling within the evaporation path of normal seawater. The data from previous studies were obtained mostly from those fluid inclusions capable of nucleating a stable bubble after a weak stretching, which probably correspond to those having a lower salinity acquired through post-depositional crack-and-seal processes. Our data suggest instead that the primary gypsum precipitated from a marine brine, later modified by post-trapping processes during tectonics and exhumation. |
| تدمد: | 1943-2682 0091-7613 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::884284f7dbf3304e35e9c34267cece71 https://doi.org/10.1130/g49475.1 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....884284f7dbf3304e35e9c34267cece71 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 19432682 00917613 |
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