The Isotopic and Trace Element Geochemistry of Dolomite: The State of the Art

Land, Lynton S.

doi:10.2110/pec.80.28.0087

Cited by 400 publications

(454 citation statements)

References 0 publications

Supporting

Mentioning

408

Contrasting

Unclassified

Order By: Relevance

“…The dolomite marked by circles has morphological characteristics similar to those of dolomite precipitated in experiments [Vasconcelos et al, 1995]. $3.0% [Land, 1980;McKenzie, 1981]. Assuming a maximum percentage of 100% for dolomite after 4800 cal years B.P., then a minimum variation of $3.0% in d 18 O values is expected for cogenetic calcite during the time interval 7200 -4800 cal years B.P.…”

Section: Mid-holocene Drying Inferred From Dolomite Precipitation Andmentioning

confidence: 76%

“…d 18 O values of authigenic carbonate are controlled by temperature and the oxygen isotope value of lake water [e.g., Fontes et al, 1996], and carbonate phases [Land, 1980;McKenzie, 1981]. Previous studies have shown that dolomite is enriched in 18 O relative to cogenetic calcite by Figure 4a, (c) two calcite aggregates, (d) calcite crystals precipitated on the surface of quartz as marked by circles, (e) knobbly dolomite coating on the surface of feldspar, and (f) an enlarged picture of the rectangle in Figure 4e.…”

Section: Mid-holocene Drying Inferred From Dolomite Precipitation Andmentioning

confidence: 99%

See 1 more Smart Citation

Timing and spatial distribution of mid‐Holocene drying over northern China: Response to a southeastward retreat of the East Asian Monsoon

Jiang

Liu

2007

J. Geophys. Res.

View full text Add to dashboard Cite

[1] To determine the timing and spatial distribution of mid-Holocene drying over northern China, the mineralogical and oxygen isotopic composition of authigenic carbonate from a closed lake at Bayanchagan, southern Inner Mongolia, were measured. Further analysis and synthesis of the spatial geological data were performed. Results from Lake Bayanchagan show a significant drying at 6000 calendar years (cal years) B.P., indicated by dolomite precipitation and a striking rise in d 18 O values. The synthesis of spatial data reveals a zonal distribution for timing of drying over northern China in the mid-Holocene, which began at 9000-7000 cal years B.P. in deserts of north-central China. At 7000-5500 cal years B.P., drying extended into the desert-steppe transitional zone and at $4500 cal years B.P. into northeastern and south-central China. This pattern indicates that the east Asian summer monsoon has significantly retreated southeastward since the mid-Holocene, which may be related to orbitally induced Northern Hemisphere insolation changes. A retreat of $400-550 km is inferred for the front of the summer monsoon from 6500 to 4500 cal years B.P.

show abstract

Section: Mid-holocene Drying Inferred From Dolomite Precipitation Andmentioning

confidence: 76%

Section: Mid-holocene Drying Inferred From Dolomite Precipitation Andmentioning

confidence: 99%

Timing and spatial distribution of mid‐Holocene drying over northern China: Response to a southeastward retreat of the East Asian Monsoon

Jiang

Liu

2007

J. Geophys. Res.

View full text Add to dashboard Cite

show abstract

“…Limestones at the base of E3 cluster around -9‰ and display consistently more negative δ 18 O values than dolomite (mostly -1 to -4‰). This offset is greater than the 3‰ expected from equilibrium precipitation from a fluid of the same δ 18 O composition at the same temperature (Land, 1980). Strontium concentrations in the basal 30 m of E3 range from 514 to 705 ppm for limestones and 84 to 319 ppm for dolostones (supplementary data, Table S1).…”

Section: Descriptionmentioning

confidence: 90%

“…13) implies that calcite fills remaining porosity at horizons where dolomite cementation was sufficient to resist any further compaction. Calcite and dolomite precipitating from fluids with the same δ 18 O at the same temperature are expected to differ in δ 18 O by 3‰ (Land, 1980), but most calcites have even lower δ 18 O, consistent with an origin at higher temperature.…”

Section: Geochemistry and Petrologymentioning

confidence: 95%

The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis

Fairchild

Bonnand²,

Davies

et al. 2016

Precambrian Research

View full text Add to dashboard Cite

General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms At the base of E3, interstratification of cap carbonate with ice-rafted and redeposited glacial sediments occurs. Early diagenetic stabilization of carbonate mineralogy from a precursor, possibly ikaite, to calcite or dolomite is inferred. E3 is predominantly dolomitic silt-shale, with sub-millimetre lamination, lacking sand or current-related sedimentary structures. Thin fine laminae are partly pyritized and interpreted as microbial mats. Dolomite content is 25-50%, with δ 13 C values consistently around +4‰, a value attributed to buffering by dissolution of a precursor metastable carbonate phase. Local calcite cement associates with low δ 13 C values. The carbonates form silt-sized, chemically zoned rhombic crystals from an environment with dynamically changing Fe and Mn. Three-dimensional reconstructions of cm-scale disturbance structures indicate that they represent horizontally directed sock-like folds, developed by release of overpressure into thin surficial sediment overlying an early-cemented layer.A shoaling upwards unit near the top of E3 displays calcium sulphate pseudomorphs in dolomite in the north, but storm-dominated limestones in the south, both being overlain by peritidal oolitic dolomites, exposed under the succeeding Wilsonbreen glacial deposits. There is no Trezona δ 13 C anomaly, possibly implying top-truncation of the succession.Regular 0.5 m-scale sedimentary rhythms, reflecting subtle variations in sediment texture or composition occur throughout E3 and are interpreted as allocyclic. They are thought to be mainly primary in origin, locally modified slightly during early diagenetic cementation. Rhythms are proposed to represent ca. 18 kyr precession cycles, implying 6-8 Myr deposition between glaciations.

show abstract

“…Such estimates for Δδ 18 Odolo-cal at 25°C, based on experiments and theoretical calculations, include 4 to 7‰ (Northrop and Clayton, 1966;O'Neil et al, 1969;Matthews and Katz, 1977;Clayton et al, 1989), 2.6 to 4‰ (Fritz and Smith, 1970;Vahrenkamp and Swart, 1994;Schmidt et al, 2005;Vasconcelos et al, 2005;Chacko and Deines, 2008), 3‰ (Land, 1980). Although such values can be translated to 0.05-0.14‰ increase in δ 18 O per 1%Mg increase, the magnitude of that increase for dolomite is poorly constrained for different temperature condition.…”

mentioning

confidence: 99%

Oxygen and Carbon Isotopic Composition of Carbonate Rocks of the Permian Qixia Formation, Sichuan Basin: Thermal Effects of Emeishan Basalt

Huang

Zhong

et al. 2016

Earth sci. res. j.

View full text Add to dashboard Cite

The late Permian thermal events related to Emeishan Basalt has made a great impact on the underlying carbonate rock properties in the western margin of the Yangtze Platform. In this paper, we investigate the carbon and oxygen isotopic composition of the Qixia Formation carbonates from two sections: the Qiaoting Section in the northeastern part of the Sichuan Basin and the Changjianggou Section at the northwestern edge of the Basin. The data reveal that: (i) Samples from Qiaoting section show a relatively narrow range of δ Los eventos térmicos del Pérmico tardío relacionados con el Basalto Emeishan han tenido un gran impacto en las propiedades de las rocas de carbonato subyacentes en el margen occidental de la plataforma Yangtze. En este artículo se investiga la composición isotópica de carbonatos de la formación Qixia en dos secciones: la sección de Qiaoting en la parte nororiental de la cuenca Sichuan y la sección Changjianggou, en el noroccidente de la cuenca. La información evidencia que, (i) las muestras de la sección Qiaoting tienen un espectro más angosto que va de δ 13 C a δ 18 O, con variación de 2.7 ‰ a 5,2 ‰, con un promedio de 4.2 ‰, y -3.8 ‰ a -7.8 ‰, con una media de -5.4 ‰, respectivamente. En contraste, las muestras de la sección Changjianggou tienen una variación de mayor magnitud en δ 13 C a δ 18 O que va desde -1 ‰ hasta 3.8 ‰, con un promedio de 1.5 ‰, y de -2.1 a -9.2 ‰, con una media de -6.0 ‰, respectivamente; (ii) los registros de δ 13 C y δ 18O en carbonatos son similares a los de agua marina del pérmico medio, mientras que los carbonatos de la sección Changjianggou se ven empobrecidos en 13C y 18O comparados al agua marina de esta edad; con base en la petrografía combinada y la evidencia del flujo paleotérmico, la baja composición isotópica de oxígeno y carbón de los carbonatos en la sección de Changjianggou se interpretó como resultado de los efectos térmicos del Basalto Emeishan debido a la proximidad con el centro de erupción. La alta temperatura redujo los valores de δ 18 O de los carbonatos y llevó a la maduración temprana de la materia orgánica, lo que produjo dióxido de carbono enriquecido en 13 C durante la formación de los carbonatos. ABSTRACT RESUMEN

show abstract

The Isotopic and Trace Element Geochemistry of Dolomite: The State of the Art

Cited by 400 publications

References 0 publications

Timing and spatial distribution of mid‐Holocene drying over northern China: Response to a southeastward retreat of the East Asian Monsoon

Timing and spatial distribution of mid‐Holocene drying over northern China: Response to a southeastward retreat of the East Asian Monsoon

The Late Cryogenian Warm Interval, NE Svalbard: Chemostratigraphy and genesis

Oxygen and Carbon Isotopic Composition of Carbonate Rocks of the Permian Qixia Formation, Sichuan Basin: Thermal Effects of Emeishan Basalt

Contact Info

Product

Resources

About