Louann salt geochemistry (Gulf of Mexico sedimentary basin, U.S.A.): A preliminary synthesis

Land, Lynton S.; Kupecz, Julie A.; Mack, Lawrence E.

doi:10.1016/0009-2541(88)90144-1

Cited by 36 publications

(12 citation statements)

References 8 publications

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“…Stratigraphic relations and biostratigraphy thus indicate that the youngest salt, probably early Kimmeridgian, in onshore Mexico is younger than the youngest Louann salt, but stratigraphic relations are equivocal regarding the age of basal salt, which could be as old as Callovian (e.g., Vega and Lawton, 2011). Bromide concentrations measured in subsurface salt samples from both the Gulf of Mexico and onshore Mexico salt basins are consistent with precipitation of both halite and anhydrite from marine water (Land et al, 1988).…”

Section: Introductionmentioning

confidence: 79%

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U-Pb ages of igneous xenoliths in a salt diapir, La Popa basin: Implications for salt age in onshore Mexico salt basins

Lawton

Amato

2017

Lithosphere

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Ar cooling ages from a nearby diapir, which are younger than Upper Jurassic strata overlying the salt, combine to suggest that these samples were intruded into salt and exhumed during diapirism. A porphyritic mafic rock with a U-Pb zircon age of 150 Ma (Tithonian) has a crystallization age coeval with marine strata overlying the salt. It is interpreted as a shallow intrusion into salt emplaced after the onset of salt diapirism. Magmatism thus took place from 158 to 150 Ma.

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Section: Introductionmentioning

confidence: 79%

“…1 and 2). The salt of the onshore Mexican salt basins records the initial influx of marine water, the source of the salt (e.g., Land et al, 1988), into a rift or pull-apart basin system formerly isolated from the Gulf of Mexico by NW-trending basement blocks (Fig. 1).…”

Section: Implications For Age Of Salt Depositionmentioning

confidence: 99%

U-Pb ages of igneous xenoliths in a salt diapir, La Popa basin: Implications for salt age in onshore Mexico salt basins

Lawton

Amato

2017

Lithosphere

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“…Below a depth of 3 km halite also may develop significant secondary porosity and permeability (Lewis & Holness 1996). Such secondary porosity was first recognized by Land et al (1988), especially in halite, fostering alteration. This does not necessarily occur in areas that are tectonically stable but is well developed in regions of elevated fluid pressure due to tectonics or increasing hydrothermal gradient (Hovland et al 2006a, b).…”

Section: Styles Of Deposition In Evaporite Basinsmentioning

confidence: 99%

Introduction and overview

Schreiber

Bąbel

Lugli

2007

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“…The δ 18 O values of the dolomites show a very wide range from -17.54 to -8.03‰V-PDB (12.83 to 22.63‰V-SMOW), and are interpreted to reflect the temperature and oxygen isotope values of the water (δ 18 O water ) from which the dolomite precipitated. Based on limited homogenization temperature measurements from fluid inclusions in dolomites (t = 215ºC), the δ 18 O water can be calculated from the dolomite-water fractionation equation of Land (1985): Considering the δ 18 O water of the dolomites, if they formed at equilibrium temperatures (i.e. t = 215ºC), the calculated δ 18 O water will be between +2 and +12‰ V-SMOW, which is far more enriched than any sea water known.…”

Section: Oxygen Isotopes and Temperaturesmentioning

confidence: 99%

“…The stable isotope data suggests that significant interactions between the Hormoz Salt and the ambient brines occurred at depth (c.f. Knauth et al, 1980;Land et al, 1988). Stable isotope analyses of brines in salt deposits in Louisiana led Knauth et al (1980) to conclude that basinal fluids were able to penetrate the salt at depths greater than 3 to 4 km.…”

Section: Oxygen Isotopes and Temperaturesmentioning

confidence: 99%

Hydrocarbon‐induced Diagenetic Dolomite and Pyrite Formation Associated With the Hormoz Island Salt Dome, Offshore Iran

Ghazban

Al‐Aasm

2010

Journal of Petroleum Geology

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Hormoz Island, a salt diapir in the eastern Persian Gulf, is dominated by the Infracambrian Hormoz Complex comprising both evaporites (Hormoz Salt) and carbonates, siliciclastics and volcanic rocks. Minerals include black, white and grey dolomites, pyrite, gypsum, anhydrite, apatite and iron oxides. Formation of some of the dolomite crystals is interpreted to be linked to the oxidation of hydrocarbons.The δ 13 C values of black dolomite crystals range from -0.8 to -2.07‰ VPDB, indicating that little if any of their carbon is derived from hydrocarbon oxidation but that sea water has provided carbon and Mg for dolomite precipitation. The δ 18 O values for these dolomites range from -9.2 to -15.3‰ VPDB, reflecting a temperature effect on isotopic fractionation. By contrast, δ 13 C values for white to grey dolomites range from -17.81 to -35.68‰ VPDB, indicating that the carbon may be derived from the oxidation of hydrocarbons. Based on the δ 18 O dolomite and temperatures obtained from fluid inclusion studies (215ºC), the calculated δ 18 O water in equilibrium with these dolomites (+2 < δ 18 O fluid < +12‰ ) indicates the involvement of brines evolved via the interaction of seawater with the Hormoz Salt and associated sedimentary rocks. Some of the dolomite may have precipitated from post-Cambrian seawaters at lower temperatures (ca.100 ºC). Thus, the dolomites may have begun to form during deep burial but have also formed during salt diapirism at more shallow depths.Pyrite and native sulphur are interpreted to have formed in reducing conditions where the source of sulphur was H 2 S produced by the thermochemical reduction of sulphate in the Hormoz Salt evaporites. Heavy δ 34 S values for the anhydrites (ranging from 28.7 to 30.8‰ ) and for sulphides (ranging from 17.2 to 23.4‰ ) preclude a major contribution of sulphur from volcanic sources or from Early Cambrian shales.Pyrites, apatites and dolomites formed at depth within the diapir. It is envisaged that hydrocarbons leaked along the flanks of the Hormoz Island salt dome, resulting in reducing conditions which promoted the formation of diagenetic minerals.

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Louann salt geochemistry (Gulf of Mexico sedimentary basin, U.S.A.): A preliminary synthesis

Cited by 36 publications

References 8 publications

U-Pb ages of igneous xenoliths in a salt diapir, La Popa basin: Implications for salt age in onshore Mexico salt basins

U-Pb ages of igneous xenoliths in a salt diapir, La Popa basin: Implications for salt age in onshore Mexico salt basins

Introduction and overview

Hydrocarbon‐induced Diagenetic Dolomite and Pyrite Formation Associated With the Hormoz Island Salt Dome, Offshore Iran

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