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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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China
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Israel (1)
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brines (2)
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Neogene
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upper Miocene
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Seasonal Pattern In the High-Elevation Fluvial Travertine From the Jiuzhaigou National Nature Reserve, Sichuan, Southwestern China
The Messinian salinity crisis: open problems and possible implications for Mediterranean petroleum systems
Did Late Miocene (Messinian) gypsum precipitate from evaporated marine brines? Insights from the Piedmont Basin (Italy)
Evidence of Clastic Evaporites In the Canyons of the Levant Basin (Israel): Implications For the Messinian Salinity Crisis
High-Frequency Cyclicity In the Mediterranean Messinian Evaporites: Evidence For Solar–Lunar Climate Forcing
The Messinian “Calcare di Base” (Sicily, Italy) revisited
Le facies evaporitiche della crisi di salinita messiniana; radioattivita naturale della Formazione Gessoso-Solfifera della Maiella (Abruzzo, Italia centrale)
Alluvial sand composition as a tool to unravel late Quaternary sedimentation of the Modena Plain, northern Italy
The Modena alluvial plain is located on the northern side of the northern Apennines fold-and-thrust belt, where streams draining the chain flow toward the northeast into the Po River. The alluvial plain is characterized by a spectacular abundance of archaeological sites of various ages and can be considered a natural laboratory for the reconstruction of the recent sedimentary evolution of the Po Plain. Detailed modal analyses of modern sands of the Modena Plain streams indicate that the provenance signal can be distinguished on the basis of key components, such as quartz, feldspar, carbonate, and lithic fragments. The compositional fields of the streams depend on the extent of the watershed, the recycling of older fluvial sediments, and the sediment input from tributary streams. The modal analyses demonstrate that sand composition of the major rivers (Panaro and Secchia) has not changed during the Holocene, when sediment production, storage, and dispersal were probably dominated by colluvial aggradation in an environment characterized by dense vegetation cover. In the late Pleistocene, fluvial sands were characterized by higher feldspar contents compared with modern and Holocene sands. This feldspar abundance could reflect a high-frequency signal in sediment supply rates linked to secular variations of weathering processes, and it reveals the strong denudation and sediment removal conditions of the last glacial stage (15–18 ka). The implication of this study is that provenance of Holocene sediments now buried in the floodplain can be determined by a simple comparison with modern sand composition. Sand composition studies may represent a useful tool to reconstruct the Pleistocene-Holocene fluvial sediment supply and the evolution of human settlements as function of climate and drainage system changes.
Detrital evaporites and mixed siliciclastic-gypsum arenites are present in the Gessi Formation from the Rossano Basin in Calabria, Italy. The detrital origin of the gypsum fragments in the quartzofeldspathic sandstones is revealed by crystal overgrowths that outline the shape of former gypsum clasts. The gypsum was subsequently transformed into anhydrite at burial conditions. During exhumation, anhydrite was hydrated back to gypsum, a gypsum overgrowth rich in F, Na, K, Cl, and Al formed on the original gypsum grains, and the pore spaces were filled with gypsum cement. Detrital modes of Gessi Formation sandstones suggest complex source-basin relationships in this area during the Messinian salinity crisis. The clastic deposits are the result of deep unroofing of the crustal terranes of the Calabrian arc and the reworking of primary Messinian evaporite facies (selenite). This study indicates that detrital evaporites and mixed siliciclastic-gypsum arenites are more widespread in the Mediterranean area than generally described in the literature.