Formation of dolomite in the Coorong region, South Australia

Rosen, Michael R.; Miser, Donald E.; Starcher, Michael A.; Warren, John K.

doi:10.1016/0016-7037(89)90009-4

Cited by 82 publications

(76 citation statements)

References 11 publications

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“…The δ 18 O values of calcite and bedrock fill in the Markit slope karst cave had negative characteristics such that the span of δ 13 C values was significant. This result is related to the Ordovician surface uplift, the overall open environment, meteoric water eluviation (Land, 1980;Rosen et al, 1989;Gasparrini et al, 2006) of widespread δ 12 C, and all δ 16 O of atmospheric CO3 2-sources (Veizer et al, 1999;Azmy et al, 2009). The relationship diagram of δ 13 C-δ 18 O (Figure 6) indicates that the filling materials in the Markit slope Ordovician carbonatite fracture cave can be divided into four classes indicating differences in formation's environment (Table 5).…”

Section: Environmental and Geological Significance Of Sr Isotopementioning

confidence: 92%

“…The distribution ranges were similar to those of the limestone background value area. Individual points drifted toward both ends, indicating that the oxygen and carbon isotope compositions of the fractures and cave calcite were controlled mainly by δ 13 C and δ 18 O in the original rock, followed by subsequent freshwater leaching and transformation (Land et al, 1980;Rosen et al, 1989). The values for some points of the δ 13 C displayed negative bias.…”

Section: Environmental and Geological Significance Of Sr Isotopementioning

confidence: 99%

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Geochemical Characteristics and Paleoenvironmental Signi cance of the Ordovician Paleokarst Reservoir in the Maigaiti Slope of Tarim Basin

et al. 2016

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The Ordovician carbonatites of the Maigaiti slope have formed the conditions for the development of large oil and gas fields with karst reservoirs. This study systematically analyzed the isotopic characteristics of carbon, oxygen, and strontium and enrichment trace elements regularity to examine the geochemical features of the paleo-karstification products, various periods of paleo-karstification, and paleoenvironmental conditions of the Ordovician. Affected by terrigenous clasts, the Lianglitage Formation is composed of limestone with a relatively high 87Sr/86Sr value and a frequently fluctuating sea level, which exhibits an overall increasing-to-decreasing trend variation. Of all samples affected by the atmospheric freshwater leaching effect, δ18O values were negative, and δ13C values varied greatly toward both ends. The fissure/cave infills were rich in Fe and Mn but poor in Sr, and the Sr/Ba value was considerably less than 1, which confirms the existence of ancient weathered crust and the development of an atmospheric freshwater karst environment. Four different paleo-karstification periods were identified according to the carbon and oxygen isotopic characteristics of calcite. Combined with the trace element characteristics of the infills, the paleo-karstification in the Yingshan Formation was subdivided based on three hydrological environment conditions. Erosion modification of buried acid compaction-released water from late-period corrosion pores, caves, and fissures formed by syndiagenetic paleo-karstification and weathered crust bare paleo-karstification due to atmospheric freshwater leaching can significantly improve the reserving and permeability characteristics of the karst reservoir to develop a large paleokarst reservoir. EARTH SCIENCES

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Section: Environmental and Geological Significance Of Sr Isotopementioning

confidence: 92%

Section: Environmental and Geological Significance Of Sr Isotopementioning

confidence: 99%

Geochemical Characteristics and Paleoenvironmental Signi cance of the Ordovician Paleokarst Reservoir in the Maigaiti Slope of Tarim Basin

et al. 2016

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“…Aragonite is preferentially precipitated instead of calcite due to the high oversaturation driven by the mixing between hydrothermal and lake water (Aiuppa et al, 2007). The formation of primary dolomite is associated to hypersaline conditions (Rosen et al, 1989). Moreover, amorphous silica is present in the deeper portion of core 1 (Fig.…”

Section: Mineralogymentioning

confidence: 99%

Geochemistry and mineralogy of a complex sedimentary deposit in the alkaline volcanic Lake Specchio di Venere (Pantelleria Island, south Mediterranean)

Cangemi

Madonia

Speziale³

2018

J Limnol

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Specchio di Venere is a peculiar, ambient temperature, geothermal, alkaline lake, with lake water oversaturated in carbonate phase where siliceous stromatolites actively grow despite the undersaturation of silica phases. The most of the main sedimentary structures of this lake have been investigated in recent years, with the exception of the carbonate bank running along the southwestern margin of the lake, which is the object of this study. Here we report on the mineralogical and geochemical characterisation of the carbonate bank, based on the study of two cores taken in the area mostly affected by the circulation of fluids of different origin. The ultimate results of our study suggest that silica gel deposits form inside the carbonate bank, following an Alkali-Silica Reaction. These new findings complete the general overview on the sedimentary processes acting in a Lake Specchio di Venere, whose origin is sometimes chemico-physical and sometimes strongly conditioned by microbial activity.

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“…The LILE substituting K are accumulated in the phyllosilicates in both parts of the sequence. High Sr content in carbonate (495-861 ppm) in comparison with the argillites (135-228 ppm) and high correlation of Sr vs. Ca (r > 0.9) documents Ca vs. Sr substitution, typical of biogenic aragonite or of a phase precipitated from evaporated marine water or brine (Rosen et al 1989;Garcia del Cura et al 2001;Korte et al 2005). Carpathian Keuper dolostones are enriched in Sr but more depleted in total sulphur (S tot~0 .02 %) than limestones (0.02 to 0.55 %) of the Fatra Formation (Table 1).…”

Section: Trace Elements and Reementioning

confidence: 99%

“…If we accept the sedimentary and microfacies character of the dolostone studied, then the C and O isotope and Sr contents indicate that Keuper fine-crystalline dolomite precipitated from brine or from pore water and can be compared with type B of the Coorong dolostone (Rosen et al 1989;Warren 2000;Garcia del Cura et al 2001;Wacey et al 2007). Brine with optimal Mg/Ca ratio can be generated by microbial processes in specific climate and hydrology.…”

Section: Cyclostratigraphic Remarksmentioning

confidence: 99%

Paleoenvironments during the Rhaetian transgression and the colonization history of marine biota in the Fatric Unit (Western Carpathians)

Michalı́k¹,

Lintnerová²,

Wójcik-Tabol³

et al. 2013

Geologica Carpathica

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Abstract:Terminal Triassic environmental changes are characterized by an integrated study of lithology, litho-and cyclostratigraphy, paleontology, mineralogy, geochemistry and rock magnetism in the Tatra Mts. The Carpathian Keuper sequence was deposited in an arid environment with only seasonal rivers, temporal lakes and swamps with scarce vegetation. Combination of a wide range of 18 O values (-0.7 to + 2.7) with negative 13 C values documents dolomite precipitation either from brackish or hypersaline lake water, or its derivation from pore water comparably to the Recent Coorong B-dolostone. Negative 13 C values indicate microbial C productivity. Rhaetian transgressive deposits with restricted Rhaetavicula fauna accumulated in nearshore swamps and lagoons. Associations of foraminifers, bivalves and sharks in the Zliechov Basin were controlled by physical factors. Bivalve mollusc biostromes were repetitively destroyed by storms, and temporary firm bottoms were colonized by oysters and burrowers. Subsequent black shale deposition recorded input of eolian dust. Bottom colonization by pachyodont bivalves, brachiopod and corals started much later, during highstand conditions. Facies evolution also revealed by geochemical data, C and O isotope curves reflect eustatic and climatic changes and help reconstruct the evolution of Rhaetian marine carbonate ramp. The Fatra Formation consists of 100 kyr eccentricity and 40 kyr obliquity cycles; much finer rhythmicity may record monsoonlike climatic fluctuations. Fluvial and eolian events were indicated by analysis of grain size and content of clastic quartz, concentrations of foraminiferal (Agathammina) tests in thin laminae indicates marine ingression events. Magnetic susceptibility (MS) variations reflect the distribution of authigenic and detrital constituents in the sequence. Increasing trend of MS correlates with the regressive Carpathian Keuper sequence and culminates within the bottom part of the Fatra Formation. Decreasing trend of MS is observed upwards the transgressive deposits of the Fatra Formation.

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Formation of dolomite in the Coorong region, South Australia

Cited by 82 publications

References 11 publications

Geochemical Characteristics and Paleoenvironmental Signi cance of the Ordovician Paleokarst Reservoir in the Maigaiti Slope of Tarim Basin

Geochemical Characteristics and Paleoenvironmental Signi cance of the Ordovician Paleokarst Reservoir in the Maigaiti Slope of Tarim Basin

Geochemistry and mineralogy of a complex sedimentary deposit in the alkaline volcanic Lake Specchio di Venere (Pantelleria Island, south Mediterranean)

Paleoenvironments during the Rhaetian transgression and the colonization history of marine biota in the Fatric Unit (Western Carpathians)

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