Tracing end-member fluid sources in sub-surface iron mineralization and dolomitization along a proximal fault to the dead sea transform

Erel, Yigal; Listovsky, N.; Matthews, Alan; Ilani, Shimon; Avni, Yoav

doi:10.1016/j.gca.2006.08.019

Cited by 15 publications

(33 citation statements)

References 38 publications

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Section: Discussionsupporting

confidence: 84%

“…A kinetic calculation based on the rate model of Arvidson & Mackenzie (1997) indicates that dolomitization must have occurred at high values of the dolomite saturation index. This result and the suggestion that epigenetic dolomitization is more protracted in the deeper formations located closer to the DST is consistent with some magnesium being derived from Mg-rich brines formed in the Dead Sea Rift, as suggested by studies of the Sr and Pb isotopes (Listovsky 2004;Erel et al 2006). The proximity to the Dead Sea Rift system would potentially allow density-driven flow of such Mg-rich brines into deep-seated sub-surface aquifers and into the fault systems as was theoretically modelled by Stanislavsky & Gvirtzman (1999).…”

Section: Discussionsupporting

confidence: 84%

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Iron mineralization and dolomitization in the Paran Fault zone, Israel: implications for low‐temperature basinal fluid processes near the Dead Sea Transform

et al. 2006

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Petrography, Eh-pH calculations and the stable isotope composition of oxygen are used to interpret geochemical processes that occurred during iron oxide mineralization and dolomitization along the Menuha Ridge segment of the Paran Fault, southern Israel, adjacent to the Dead Sea Transform (DST). Iron mineralization is strongly localized in the fault zone as ferruginous lenses, whereas Fe dolomitization spreads laterally into the CenomanianTuronian carbonate host rock as stratabound beds. The average oxygen isotope fractionation between syngenetic quartz and iron oxides in the ferruginous lenses gives a temperature of 50 ± 10°C and d 18 O SMOW water ¼ )3.5&; consistent with an origin from metalliferous groundwater flow in the sedimentary basin. Ferroan dolomite initially formed under strongly reducing conditions, but this was followed by oxidation and pseudomorphic replacement of the dolomite by a mesh of fine-grained iron oxides (simple zoned dolomites). This cycle of ferroan dolomite formation and replacement by iron oxides was repeated in complex zoned dolomites. Dolomite oxygen isotope compositions fall into two groups: a high d 18 O group corresponding to the simple zoned dolomites and non-ferroan dolomites and a low d 18 O group corresponding to the complex zoned dolomites. Waterrock calculations suggest that the epignetic dolomites formed under fluid-buffered conditions: the high d 18 O group are indicated to have formed at temperatures of ca. 25°C for waters with d 18 O ¼ )4 to 0&; the low d 18 O complex zoned dolomites at 50-75°C for waters with the same isotopic composition. A kinetic calculation for a complex zoned dolomite-bearing bed indicates that dolomitization must have occurred at high values of the dolomite saturation index. This requirement for high Mg supersaturation and the indication that epigenetic dolomitization is more protracted in stratigraphically deeper formations located closer to the DST is consistent with models proposing that Mg-rich solutions originated in the Dead Sea Rift.

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Section: Discussionsupporting

confidence: 84%

Section: Discussionsupporting

confidence: 84%

Iron mineralization and dolomitization in the Paran Fault zone, Israel: implications for low‐temperature basinal fluid processes near the Dead Sea Transform

et al. 2006

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“…The Mo-enriched iron oxides precipitated at the redox interface between rising reduced Fe(II)-bearing solutions and oxidized waters of the upper aquifer (Erel et al, 2006;Grosz et al, 2006). Fractionation factors for Mo isotopes during adsorption onto Fe oxides are still not well defi ned (Wasylenki et al, 2008).…”

Section: Discussionmentioning

confidence: 99%

Large molybdenum isotope variations trace subsurface fluid migration along the Dead Sea transform

Ryb

Erel

Matthews

et al. 2009

Geology

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Large (−0.6‰ to +2.3‰) δ 97/95 Mo variations occur in molybdenum-enriched iron oxide veins located in anticlines adjacent to the Dead Sea transform, and are thought to refl ect the solutions from which the veins formed because of effi cient scavenging of Mo by iron oxides. The wide range of δ 97/95 Mo values occurs in a paleohydrologic setting in which dense, concentrated, evaporitic marine brines in the Dead Sea Rift valley (δ 97/95 Mo ~1.6‰) penetrated and interacted with sedimentary rocks of the rift fl anks, which included Cretaceous bituminous chalks (δ 97/95 Mo 0.8‰-1.2‰), before intermixing with Febearing groundwater containing molybdenum of igneous and clastic origin. The δ 97/95 Mo values higher than seawater (1.6‰-2.3‰) are attributed to Rayleigh isotopic fractionation along the path of the brine migration. Molybdenum isotopes thus reveal a powerful potential to trace the sources and processes governing subsurface metalliferous fl uid migration.

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“…The samples selected for isotopic analysis of Sr and Pb went through ion exchange columns according to the protocols outlined in Erel et al (2006). Then, the samples were analyzed by a MC-ICP-MS (Nu Instruments) as described by Erel et al (2006) and Ehrlich et al (2004) Pb ¼ 0.9145 ± 4 (2s), n ¼ 7.…”

Section: Chemical and Isotopic Measurementsmentioning

confidence: 99%

“…Then, the samples were analyzed by a MC-ICP-MS (Nu Instruments) as described by Erel et al (2006) and Ehrlich et al (2004) Pb ¼ 0.9145 ± 4 (2s), n ¼ 7.…”

Section: Chemical and Isotopic Measurementsmentioning

confidence: 99%

Iron Age Nomads and their relation to copper smelting in Faynan (Jordan): Trace metal and Pb and Sr isotopic measurements from the Wadi Fidan 40 cemetery

Beherec

Levy

Tirosh

et al. 2016

Journal of Archaeological Science

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Tracing end-member fluid sources in sub-surface iron mineralization and dolomitization along a proximal fault to the dead sea transform

Cited by 15 publications

References 38 publications

Iron mineralization and dolomitization in the Paran Fault zone, Israel: implications for low‐temperature basinal fluid processes near the Dead Sea Transform

Iron mineralization and dolomitization in the Paran Fault zone, Israel: implications for low‐temperature basinal fluid processes near the Dead Sea Transform

Large molybdenum isotope variations trace subsurface fluid migration along the Dead Sea transform

Iron Age Nomads and their relation to copper smelting in Faynan (Jordan): Trace metal and Pb and Sr isotopic measurements from the Wadi Fidan 40 cemetery

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