Water-Rock Interaction History of Regionally Extensive Dolomites of the Burlington-Keokuk Formation (Mississippian): Isotopic Evidence

Banner, Jay L.; Hanson, Gilbert N.; Meyers, William J.

doi:10.2110/pec.88.43.0097

Cited by 91 publications

(74 citation statements)

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“…Variation in trace element concentration and oxygen isotopic composition of carbonate rocks reveal diagnostic alteration trends that result from interaction with diagenetic fluids (Brand and Veizer, 1980;Banner et al, 1988;Banner and Hanson, 1990;Jacobsen and Kaufman, 1999). The difference in composition between a carbonate rock (and the water from which it precipitated) and a diagenetic fluid is the primary factor in determining the rate and extent of elemental and isotopic exchange in the carbonate rock.…”

Section: Diagenesis and Preser6ation Of Carbonate Geochemical Signaturesmentioning

confidence: 99%

Global events across the Mesoproterozoic–Neoproterozoic boundary: C and Sr isotopic evidence from Siberia

Bartley¹,

Семихатов²,

Kaufman³

et al. 2001

Precambrian Research

171

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Section: Diagenesis and Preser6ation Of Carbonate Geochemical Signaturesmentioning

confidence: 99%

Global events across the Mesoproterozoic–Neoproterozoic boundary: C and Sr isotopic evidence from Siberia

Bartley¹,

Семихатов²,

Kaufman³

et al. 2001

Precambrian Research

171

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“…Hall and Friedman 1969;Pinckney and Rye 1972;Sverjensky 1981;Hannah and Stein 1984;Machel 1987;Gregg and Shelton 1989;Rowan and Leach 1989;Frank and Lohman 1986;Ghazban et al 1990). In general, it has been observed that with advancing diagenetic stages, the carbon and oxygen isotope ratios are lowered (Machel 1987;Banner et al 1988;Kaufman et al 1990Kaufman et al , 1991Fontbot6 and Gorzawski 1990;Moritz et al 1993). …”

mentioning

confidence: 99%

Apparent stable isotope heterogeneities in gangue carbonates of the Mississippi Valley-type Zn-Pb deposit of San Vicente, central Peru

1995

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Abstract. The aim of the present communication is to emphasize that some variations of the measured 613C and 6180 values are apparent, and due to analytical interferences caused by the presence of sulfur and organosulfur compounds in the analyzed carbonates. This is particularly relevant for isotopic studies on carbonate-hosted mineral deposits, where the nearly ubiquitous association of the host carbonates with organic matter and sulfides can certainly affect the metallogenetic interpretations. In this work two methods were used to overcome the disturbing effects of sulfides and organic matter: (1) sample pretreatment following the method proposed by Charef and Sheppard (1984), combining the oxidation of organic matter with sodium hypochlorite and trapping of the sulfur species with silver phosphate; and (2) laser-based microprobe extraction. Apparent isotopic variations in sparry dolomite from a single hand sample of zebra ore from the MVT Zn-Pb deposit, San Vicente, central Peru, are as large as 6%0 613C and 4%0 6180. These variations are reduced to several tenths of a per rail when the samples are pretreated. A careful examination of the effects of treatment with NaOC1 and/or AgaPO4 in relation to the concentration of sulfide inclusions indicates that the main disturbing effects for 613 C values are the presence of sulfur species and organic matter, whereas the 6180 values are mainly affected by the presence of sulfides. Fine-and medium-grained replacement carbonates from MVT and other sediment-hosted base metal deposits are potentially the most affected during isotope analysis, due to the common presence of organic matter and sulfides. Using in situ laser microprobe techniques, it is possible to determine isotopic variations at a sub-millimeter scale. Our results show that laser extraction analysis allows a more precise sampling of the carbonate minerals, and minimizes contamination of the sample with sulfides and to some extent with intergrown organic matter. However, there is an isotopic shift associated with the laser extraction technique, of the order of 0.5-1%o for 613C and 6180 values.Changes in the stable isotope composition of host and gangue carbonates of Mississippi Valley-type (MVT)

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“…REE features) of the medium in which they precipitated. However, since carbonate REE content could also be influenced by noncarbonate materials, such as fine-grained siliciclastic material in excess of 5% (Banner et al, 1988), great care must be taken when making such an interpretation. Fortunately, petrographic and geochemical observations have shown that noncarbonate phases are negligible in the analyzed Föderata Group metacarbonates and hence an additional influence on the REE chemistry of the studied rocks by noncarbonates can be excluded.…”

Section: Conditions Of Formation Of the Föderata Group Metacarbonatesmentioning

confidence: 99%

Geochemistry and C, O, and Sr isotope composition of the Föderata Group metacarbonates (southern Veporicum, Western Carpathians, Slovakia):constraints on the nature of protolith and its depositional environment

Vďačný¹,

Růžička²,

Vozárová³

2016

Turkish J Earth Sci

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Major, trace, and rare earth element as well as C, O, and Sr isotope geochemistry is used to provide new insights into the characteristics and depositional environment of the protolith of the Föderata Group metacarbonates in the southern Veporicum cover sequence (Western Carpathians, Slovakia). The metacarbonates are characterized by high LOI and CaO and by small contents of various insoluble components. Among the trace elements investigated, only As, Ba, Co, Cu, Hg, Nb, Ni, Pb, Rb, Sb, Sr, Th, U, Y, Zn, and Zr display concentrations beyond their detection limits. The metacarbonates are strongly depleted in Rb, Ba, Th, Nb, Hf, Zr, and Y and enriched in U and Sr relative to the UCC. Chondrite-normalized rare earth element patterns of the metacarbonates show a moderate to strong fractionation in light rare earth elements over heavy rare earth elements and distinct negative Ce and Eu anomalies. Variation plots reveal several geochemical interrelationships, among which SiO 2 -Al 2 O 3 -K 2 O -TiO 2 -Ba -Nb -Rb -Zr are associated with the rock's silicate fraction. The carbonate fraction comprise CaO, MgO, and Sr. The overall geochemical and C-, O-, and Sr-isotopic signatures indicate that the metacarbonates developed from sedimentary carbonate materials that were deposited in a saline, shallowmarine, low-energy environment. The negative Ce anomaly (Ce/Ce* = 0.15-0.93) and the δ 13 C (2.36‰ to -3.34‰) values indicate warmer climatic conditions during deposition. The consistency of the rock's chemical properties could be attributed to the relative stability experienced during the parent sedimentary material's deposition.

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Water-Rock Interaction History of Regionally Extensive Dolomites of the Burlington-Keokuk Formation (Mississippian): Isotopic Evidence

Cited by 91 publications

References 0 publications

Global events across the Mesoproterozoic–Neoproterozoic boundary: C and Sr isotopic evidence from Siberia

Global events across the Mesoproterozoic–Neoproterozoic boundary: C and Sr isotopic evidence from Siberia

Apparent stable isotope heterogeneities in gangue carbonates of the Mississippi Valley-type Zn-Pb deposit of San Vicente, central Peru

Geochemistry and C, O, and Sr isotope composition of the Föderata Group metacarbonates (southern Veporicum, Western Carpathians, Slovakia):constraints on the nature of protolith and its depositional environment

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