... PART 1 Introduction GEORGES BUSSON AND B. CHARLOTTE SCHREIBER The sedimentary filling in the ... more ... PART 1 Introduction GEORGES BUSSON AND B. CHARLOTTE SCHREIBER The sedimentary filling in the numerous Paleogene basins of southeastern ... Additionally, efflorescent salt crusts are also known, but are only occasionally preserved (Smoot and Castens-Seidell 1994). ...
... Recently, data obtained from the latest Miocene (Messinian) sediments of the Mediterranean Ba... more ... Recently, data obtained from the latest Miocene (Messinian) sediments of the Mediterranean Basin and from modern salinas have shown that specific submarine evaporites do ... Page 6. Observations made in modern salinas (solar salt pans) suggest that the laminae were ...
Widespread quartz pseudomorphs after evaporitic minerals are interbedded with stromatolites in 2.... more Widespread quartz pseudomorphs after evaporitic minerals are interbedded with stromatolites in 2.2 Ga sedimentary rocks in the Yerrida rift basin of Western Australia. These deposits preserve diverse original crystal morphologies that grew displacively either as individuals or as clusters within stromatolitic horizons and associated fine-grained siliciclastic beds. The stromatolites were deposited in shallow-marine, restricted environments. Although evaporitic minerals are largely replaced by quartz, their crystal shapes include lenticular, rosette, needle, and nodular forms, suggesting that they formed from calcium sulfate rich brines. Textures suggest that replacement by quartz occurred during early alteration of the sediments. Original calcium sulfate minerals such as gypsum or anhydrite are indicated by the morphologies of the pseudomorphs; this concept is supported by anhydrite inclusions in the quartz crystals that form the pseudomorphs, and this finding indicates that calcium sulfate existed in Early Proterozoic sedimentary environments.
The chemistry of modern and ancient evaporites, and their parent waters, is reflected in the mine... more The chemistry of modern and ancient evaporites, and their parent waters, is reflected in the mineralogy and facies distribution remaining in the geologic record. The evaporation of modern seawater and the order of precipitated salts, as well as the environment in which marine evaporites are deposited, together are the key for the understanding of the fossil record. The chemical evolution of the ocean has influenced the mineralogy of the K–Mg salts, and these changes are recorded in primary fluid inclusions remaining in unaltered halite. This chapter reviews these problematic sediments, describing in detail how the evaporite mineralogy and halite fluid inclusions have been used to estimate the chemical composition of ancient oceans. Here, we present and discuss the evaporite record in the Precambrian as well as the Phanerozoic and the general geologic significance of evaporites
... DISCUSSION OF CARBONATE LITHOFACIES ... of the Sicilian Basin, suggested that at the time the... more ... DISCUSSION OF CARBONATE LITHOFACIES ... of the Sicilian Basin, suggested that at the time the uppermost Tortonian marls were being deposited the basinal water depth was about 600 m. This depth was established on the basis of the observed ostracod fauna (Decima ...
ABSTRACT Detrital particles were found as a sand-silt layer in a deep-sea Messinian Stage (Upper ... more ABSTRACT Detrital particles were found as a sand-silt layer in a deep-sea Messinian Stage (Upper Miocene) salt deposit in the Mediterranean Basin (Balearic Sea). These particles include worn and limonite-coated quartz, feldspar, glauconite, volcanic glass, reworked Messinian foraminifera and some lutecites. The lutecites are not original to the salt and taken in their association with the other detritus, especially the foraminifera, suggest syndepositional reworking of exposed Messinian evaporites.
... PART 1 Introduction GEORGES BUSSON AND B. CHARLOTTE SCHREIBER The sedimentary filling in the ... more ... PART 1 Introduction GEORGES BUSSON AND B. CHARLOTTE SCHREIBER The sedimentary filling in the numerous Paleogene basins of southeastern ... Additionally, efflorescent salt crusts are also known, but are only occasionally preserved (Smoot and Castens-Seidell 1994). ...
... Recently, data obtained from the latest Miocene (Messinian) sediments of the Mediterranean Ba... more ... Recently, data obtained from the latest Miocene (Messinian) sediments of the Mediterranean Basin and from modern salinas have shown that specific submarine evaporites do ... Page 6. Observations made in modern salinas (solar salt pans) suggest that the laminae were ...
Widespread quartz pseudomorphs after evaporitic minerals are interbedded with stromatolites in 2.... more Widespread quartz pseudomorphs after evaporitic minerals are interbedded with stromatolites in 2.2 Ga sedimentary rocks in the Yerrida rift basin of Western Australia. These deposits preserve diverse original crystal morphologies that grew displacively either as individuals or as clusters within stromatolitic horizons and associated fine-grained siliciclastic beds. The stromatolites were deposited in shallow-marine, restricted environments. Although evaporitic minerals are largely replaced by quartz, their crystal shapes include lenticular, rosette, needle, and nodular forms, suggesting that they formed from calcium sulfate rich brines. Textures suggest that replacement by quartz occurred during early alteration of the sediments. Original calcium sulfate minerals such as gypsum or anhydrite are indicated by the morphologies of the pseudomorphs; this concept is supported by anhydrite inclusions in the quartz crystals that form the pseudomorphs, and this finding indicates that calcium sulfate existed in Early Proterozoic sedimentary environments.
The chemistry of modern and ancient evaporites, and their parent waters, is reflected in the mine... more The chemistry of modern and ancient evaporites, and their parent waters, is reflected in the mineralogy and facies distribution remaining in the geologic record. The evaporation of modern seawater and the order of precipitated salts, as well as the environment in which marine evaporites are deposited, together are the key for the understanding of the fossil record. The chemical evolution of the ocean has influenced the mineralogy of the K–Mg salts, and these changes are recorded in primary fluid inclusions remaining in unaltered halite. This chapter reviews these problematic sediments, describing in detail how the evaporite mineralogy and halite fluid inclusions have been used to estimate the chemical composition of ancient oceans. Here, we present and discuss the evaporite record in the Precambrian as well as the Phanerozoic and the general geologic significance of evaporites
... DISCUSSION OF CARBONATE LITHOFACIES ... of the Sicilian Basin, suggested that at the time the... more ... DISCUSSION OF CARBONATE LITHOFACIES ... of the Sicilian Basin, suggested that at the time the uppermost Tortonian marls were being deposited the basinal water depth was about 600 m. This depth was established on the basis of the observed ostracod fauna (Decima ...
ABSTRACT Detrital particles were found as a sand-silt layer in a deep-sea Messinian Stage (Upper ... more ABSTRACT Detrital particles were found as a sand-silt layer in a deep-sea Messinian Stage (Upper Miocene) salt deposit in the Mediterranean Basin (Balearic Sea). These particles include worn and limonite-coated quartz, feldspar, glauconite, volcanic glass, reworked Messinian foraminifera and some lutecites. The lutecites are not original to the salt and taken in their association with the other detritus, especially the foraminifera, suggest syndepositional reworking of exposed Messinian evaporites.
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