A procedure for making the Titan-yellow stain for Mg-calcite permanent

Choquette, Philip W.; Trusell, Fred

doi:10.1306/212f74ff-2b24-11d7-8648000102c1865d

Cited by 32 publications

(17 citation statements)

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“…Aragonite was stained with Feigl's solution (Feigl 1958). Titan-Yellow staining allowed the estimation of the Mg content of calcite (Choquette and Trusell 1978) by comparison with stained calcites of known Mg content. Mg measurements were performed with atomic absorption spectrometry on a Philips PU 9200X (Philips, Best, The Netherlands).…”

Section: Methodsmentioning

confidence: 99%

Cold seep deposits of Beauvoisin (Oxfordian; southeastern France) and Marmorito (Miocene; northern Italy): microbially induced authigenic carbonates

Peckmann¹,

Thiel

Michaelis

et al. 1999

International Journal of Earth Sciences

221

123

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The relation of two well-known ancient carbonate deposits to hydrocarbon seepage was confirmed by this study. Archaea are found to be associated with the formation of Oxfordian seep carbonates from Beauvoisin and with a Miocene limestone from Marmorito ("tube-worm limestone"). Carbonates formed due to a mediation by archaea exhibit extremely positive or extremely negative d 13 C carbonate values, respectively. Highly positive values (c15‰) reflect the use of 13 C-enriched CO 2 produced by methanogenesis. Low d 13 C values of the Marmorito carbonates (-30‰) indicate the oxidation of seepagederived hydrocarbons. Likewise, the d 13

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Section: Methodsmentioning

confidence: 99%

Cold seep deposits of Beauvoisin (Oxfordian; southeastern France) and Marmorito (Miocene; northern Italy): microbially induced authigenic carbonates

Peckmann¹,

Thiel

Michaelis

et al. 1999

International Journal of Earth Sciences

221

123

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“…50 peels) were prepared following standard procedures (Ginsburg et aI., 1966;Allman and Lawrence, 1972). Thin sections were stained for highMg-calcite (Winland, 1971;Choquette and Trusell, 1978). For the staining of both aragonite (Cheetham et al, 1969) and Fe-calcite (Dickson, 1966), I used polished sections from which subsequently peels were made (Katz and Friedman, 1965).…”

Section: Methods Of Studymentioning

confidence: 99%

Marine and meteoric diagenesis of submarine pleistocene carbonates from the Bermuda Carbonate Platform

Vollbrecht

1990

Carbonates Evaporites

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The tectonically stable Bermuda Carbonate Platform has undergone repeated emersions and submersions in the course of the Pleistocene sea-level changes. Shallow seismic reflection profiling and high-energy vibration coring gave access to Pleistocene carbonates that are presently situated below sea level. A study of their diagenesis was undertaken in order to document the changes occuring in various diagenetic environments, to check a, possible correlation between the state of diagenetic preservation and stratigraphic age, and to estimate the odds for a complete diagenetic imaging of a sediment's pore-water history. For the purpose of comparison, several samples from the modern Bermuda Islands were analysed as well.As indicated by their biogenic constituents, the submarine Pleistocene carbonates were chiefly composed of aragonite and high-Mg-calcite at the onset of diagenesis, whereas they now commonly appear as mixtures of aragonite and low-Mg-calcite. Marine cements (five kinds of high-Mgcalcite cement, three kinds of aragonite cement) are, as a rule, restricted to the intraparticle pore space. Meteoric influence inflicted neomorphism, cementation with low-Mg-calcite (several kinds of cement) and solution on the marine carbonates. These are characterized by patchy lithification, abundant preserved pore space and incomplete mineralogical stabilization. Furthermore, especially in lagoonal sediments, burrow or root structures have been preferentially cemented. Indicators of karst and calichification are common. High-Mg-calcite is usually the first mineral to disappear under meteoric influence; aragonite is more stable. Intensely altered carbonates consist entirely of low-Mg-calcite, whereas dolomite does not occur at all.Diagenetic indications of meteoric-phreatic alteration are generally uncommon, but support the idea of fresh-water lenses that are largely restricted to the proximity of the present islands. Most of the carbonates, however, have received their decisive diagenetic imprints in the meteoricvadose environment.The diagenetic record within the carbonates is incomplete. Only one pore-water change is recorded, from a marine to a meteoric environment. Undoubted post-meteoric marine cements are absent from the studied Pleistocene material except for some intensely Iithified littoral deposits on the present islands. Obviously, the diagenetic potential of the marine environment was too small to compete with the meteoric environment. Under these circumstances, a reconstruction of pore-water history based on diagenetic sequences is deceptive.

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“…Part of the nonpowdered splits from selected samples was dried at room temperature and examined by scanning electron microscopy (SEM). Thin sections of limestones and chalks were stained for magnesian calcite, dolomite, and calcite (Evamy, 1969;Choquette and Trussell, 1978). Our results then were integrated with shipboard biostratigraphic and lithostratigraphic data .…”

Section: Methodsmentioning

confidence: 99%

A Regional Perspective of Shallow-Burial Diagenesis of Deep-Water Periplatform Carbonates from the Northern Bahamas

Dix¹,

Mullins²

1988

Proceedings of the Ocean Drilling Program

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Detailed studies of carbonate mineralogy and geochemistry using samples recovered by deep-sea drilling in the northern Bahamas document shallow-burial (<250 mbsf) diagenetic trends that occur in two stages. Stage 1 diagenesis (0-10 meters below the seafloor, mbsf) results in rapid, extensive calcitization and local dolomitization in marine-derived pore fluids. Stable oxygen isotopes are quickly enriched, while carbon values are depleted. Aragonite undergoes dissolution and high-magnesian calcite exsolves to low-magnesian calcite. Below 10 to at least 185 mbsf, stage 2 diagenesis continues to alter primary components, leading to ooze-chalk and chalk-limestone transformations and low amounts of dolomite, while rates and amplitudes of change are considerably less than in stage 1. Oxygen-and carbon-isotope ratios indicate that diagenesis still occurs in marine-derived pore fluids.Overall, shallow-burial diagenesis of periplatform carbonates proceeds much more readily than diagenesis of deepsea pelagic ooze. This is because of higher diagenetic potential related to the influx of metastable shallow-water-derived components in a deep-marine realm. Subsurface calcitization and lithification of periplatform sediments occurs rapidly with depth in regions of moderate accumulation rates (20-60 m/m.y.; north of Little Bahama Bank). This is a result of an interpreted greater rate of diagenetic alteration with burial, and in deep (3000 m) water is related to seawater saturation levels relative to carbonate mineralogy. Calcitization and local dolomitization may occur at or near the sediment/ water interface during formation of disconformities. In contrast, metastable aragonite and high-magnesian calcite are present in significant amounts at depth in regions with high accumulation rates (>90 m/m.y., Exuma Sound), despite lithification that produces chalk and limestone. The presence of metastable components in porous limestones in Exuma Sound underscores the current high diagenetic potential for these rocks and the development of reservoir potential in periplatform deep-water limestones at shallow sub-bottom depths.

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A procedure for making the Titan-yellow stain for Mg-calcite permanent

Cited by 32 publications

References 0 publications

Cold seep deposits of Beauvoisin (Oxfordian; southeastern France) and Marmorito (Miocene; northern Italy): microbially induced authigenic carbonates

Cold seep deposits of Beauvoisin (Oxfordian; southeastern France) and Marmorito (Miocene; northern Italy): microbially induced authigenic carbonates

Marine and meteoric diagenesis of submarine pleistocene carbonates from the Bermuda Carbonate Platform

A Regional Perspective of Shallow-Burial Diagenesis of Deep-Water Periplatform Carbonates from the Northern Bahamas

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