Petrography and diagenesis of the taormina formation, gela oil field, sicily (Italy)

Mattavelli, L.; Chilingarian, George V.; Storer, D.

doi:10.1016/0037-0738(69)90015-3

Cited by 20 publications

(5 citation statements)

References 4 publications

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“…All the reported findings for magnesium containing white tesserae are compatible with the composition of the typical dolomitic lithotypes of the area, already identified in the materials employed in the mosaic pavements of another Roman house explored in Taormina, in the nearby area of Porta Pasquale [39,40,55]. Moreover, the use of magnesium containing material for obtaining the tesserae of the pavement of the Domus 1 east ambulatory could have been not a casual choice, since it could have been perhaps related to the empiric awareness of dolomite resistance against weathering [56].…”

Section: White and Black Tesseraesupporting

confidence: 79%

Non-Invasive Approach to Investigate the Mineralogy and Production Technology of the Mosaic Tesserae from the Roman Domus of Villa San Pancrazio (Taormina, Italy)

et al. 2021

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The archaeological excavations at Villa San Pancrazio (Taormina, Italy) are bringing to light a vast Roman-Imperial residential quarter featuring luxurious dwellings decorated with wall paintings and mosaic floors, pointing it out as one of the most significant archaeological sites of the city. The polychrome and black and white mosaics recovered date back to the middle Imperial period, during the 2nd century AD. This work deals with the first archaeometric investigations of the materials employed for the tesserae production with the aim of elucidating the mineralogical composition and obtaining analytical evidence that can contribute to extracting information related to their production technology. For that purpose, a non-invasive methodology, based on micro energy dispersive X-ray fluorescence (μ-EDXRF) spectrometry and Raman spectroscopy, was used to characterize a wide selection of stone, ceramic and glass tesserae. Chemometric tools were exploited to manage the large set of elemental data collected on black and white lithic samples, providing essential clues for the subsequent investigations. The results evidenced the employment of natural lithotypes (calcareous sedimentary, dolomitic and volcanic) local and imported, and also artificial materials, such as ceramic made firing magnesium-rich clays, soda-lime-silica glasses made with different opacifying and coloring agents (such as calcium antimoniate, cobalt and copper).

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Section: White and Black Tesseraesupporting

confidence: 79%

Non-Invasive Approach to Investigate the Mineralogy and Production Technology of the Mosaic Tesserae from the Roman Domus of Villa San Pancrazio (Taormina, Italy)

et al. 2021

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“…It is commonly believed that dedolomite occurs in the exposed and near-surface zone and, therefore, is used to indicate an erosional unconformity (Shearman et al, 1961;Lucia, 1961;Goldberg, 1967;Evamy 1967;Folkman 1969;Chafetz, 1972;A1-Hashimi and Hemingway, 1973). However, dedolomitization is also reported to occur in subsurface dolostones under a variety of diagnetic conditions (Mattavelli et al, 1969;Longman and Mench, 1978;Land and Prezibindowski, 1981;Back et al, 1983;Budai and Lohman, 1984).…”

Section: Discussionmentioning

confidence: 99%

Dedolomitization of dolocrete deposits in Kuwait, Arabian Gulf

Khalaf

Abdal

1993

Geol Rundsch

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Dedolomitization of a dolocrete profile hosted in Mio-Pleistocene siliciclastic deposits in the area of Kuwait City, Arabian Gulf was investigated. Dolocrete dolomite crystals vary considerably in size, shape and internal structure; however, they are mostly zoned. Zonation is usually due to the alteration of cloudy and clear zones. The cloudy zones, which are mostly formed of disordered metastable dolomite, are more susceptible to dedolomitization than the stable, well ordered clear zones. Two modes of dedolomitization were recognized; the first involves complete dissolution of the metastable dolomite followed by precipitation of intracrystalline cavity-filling calcite. The second is a pseudomorphic replacement of dolomite by calcite. This replacement takes place by the simultaneous dissolution of dolomite and precipitation of calcite in such a manner that the original dolomite fabrics are inherited in the dedolomite. Exposed and near-surface dolocrete profile (less than 5 m deep) are almost completely dedolomitized and altered to secondary calcrete whereas subsurface profiles are slightly dedolomitized. Dedolomitization of the sub surface dolocrete profiles may indicate the effect of flushing by fresh groundwater; which flows from west to east, whereas the alteration of the exposed dolocrete profile could be attributed to be an effect of meteoric water. A new mode of calcrete genesis by dedolomitization and/or complete calcitization of precursor dolocrete is suggested.

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“…The wide extent of variations in the degree of geochemical evolution of the brines could be related to variable fluid sources and variable degrees of interaction with the host rocks in the basin. The positive correlation between C and O isotopes of drusy mosaic dolomite (Figure 7) suggests increasing input of 12 C into the formation waters with the increasing temperature [44]. The small variations in Sr isotopic compositions between the various types of carbonate cements suggest a related origin (Figure 8A,B).…”

Section: Discussionmentioning

confidence: 95%

“…Dolomite cement in carbonate rocks commonly develops rhombic crystals that do not show systematic size variation within the pores [11]. Nevertheless, rare drusy mosaic dolomite cement has been reported in carbonate deposits too [12][13][14][15]. The origin of such dolomite is not fully explored, particularly regarding whether it is a primary precipitate or formed by dolomitization of precursor drusy calcite cement.…”

Section: Introductionmentioning

confidence: 99%

Origin of Drusy Dolomite Cement in Permo-Triassic Dolostones, Northern United Arab Emirates

Mansurbeg

Alsuwaidi

Dong

et al. 2021

Water

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While the characteristics and origin of drusy calcite cement in carbonate deposits is well constrained in the literature, little attention is paid to drusy dolomite cement. Petrographic observations, stable isotopes, and fluid-inclusion microthermometry suggest that drusy dolomite cement in Permo-Triassic conglomerate/breccia dolostone beds in northern United Arab Emirates has precipitated as cement and not by dolomitization of drusy calcite cement. The low δ18OVPDB (−9.4‰ to −6.2‰) and high homogenization temperatures of fluid inclusions in drusy dolomite (Th = 73–233 °C) suggest that dolomitization was caused by hot basinal brines (salinity = 23.4 wt% NaCl eq.). The δ13CVPDB values (+0.18‰ to +1.6‰) and 87Sr/86Sr ratio (0.708106 to 0.708147) indicate that carbon and strontium were derived from the host marine Permo-Triassic carbonates. Following this dolomitization event, blocky calcite (Th = 148 °C; salinity = 20.8 wt% NaCl eq.) precipitated from the hot basinal brines. Unravelling the origin of drusy dolomite cement has important implications for accurate construction of paragenetic sequences in carbonate rocks and decipher the origin and chemistry of diagenetic waters in sedimentary basins.

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Petrography and diagenesis of the taormina formation, gela oil field, sicily (Italy)

Cited by 20 publications

References 4 publications

Non-Invasive Approach to Investigate the Mineralogy and Production Technology of the Mosaic Tesserae from the Roman Domus of Villa San Pancrazio (Taormina, Italy)

Non-Invasive Approach to Investigate the Mineralogy and Production Technology of the Mosaic Tesserae from the Roman Domus of Villa San Pancrazio (Taormina, Italy)

Dedolomitization of dolocrete deposits in Kuwait, Arabian Gulf

Origin of Drusy Dolomite Cement in Permo-Triassic Dolostones, Northern United Arab Emirates

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