Can Primary Ferroan Dolomite and Ankerite Be Precipitated? Its Implications for Formation of Submarine Methane-Derived Authigenic Carbonate (MDAC) Chimney

Xu, Fan; You, Xuelian; Li, Qing; Liu, Yi

doi:10.3390/min9070413

Cited by 12 publications

(6 citation statements)

References 100 publications

(179 reference statements)

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“…The occurrence of Mg-calcite and aragonite in cold seep marine environments has been reported by various authors [1,4,20]. Other carbonate minerals, such as dolomite, ankerite, ikaite, and glendonite, are significantly less common [21,22].…”

Section: Introductionmentioning

confidence: 90%

The Formation of Authigenic Carbonates at a Methane Seep Site in the Northern Part of the Laptev Sea

et al. 2020

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Authigenic carbonates from cold seeps are unique archives for studying environmental conditions, including biogeochemical processes associated with methane-rich fluid migration through the sediment column. The aim of this research was to study major oxide, mineralogical, and stable isotopic compositions of cold-seep authigenic carbonates collected in the northern part of the Laptev Sea. These carbonates are represented by Mg-calcite with an Mg content of 2% to 8%. The δ13C values range from −27.5‰ to −28.2‰ Vienna Peedee belemnite (VPDB) and indicate that carbonates formed due to anaerobic oxidation of methane, most likely thermogenic in origin. The authigenic pyrite in Mg-calcite is evidence of sulfate reduction during carbonate precipitation. The δ18O values of carbonates vary from 3.5‰ to 3.8‰ VPDB. The calculated δ18Ofluid values show that pore water temperature for precipitated Mg-calcite was comparable to bottom seawater temperature. The presence of authigenic carbonate in the upper horizons of sediments suggests that the sulfate–methane transition zone is shallowly below the sediment–water interface.

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Section: Introductionmentioning

confidence: 90%

The Formation of Authigenic Carbonates at a Methane Seep Site in the Northern Part of the Laptev Sea

et al. 2020

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“…In their study of Pennsylvanian limestones, McHargue and Price (1982) pointed out that Mg 2+ and Fe 2+ ions for ferroan dolomite precipitation were released from the smectite-illite conversion at high temperatures while the HCO 3 − supply was derived from organic matter decay. However, several recent field and laboratory experiments indicate that ferroan proto-dolomite can form through microbial mediated dolomitization under surface conditions (Vasconcelos et al, 1995;Roberts et al, 2004;Xu et al, 2019), and Precambrian ferroan dolomite may contain paleo-redox information (Wood et al, 2017).…”

Section: Early Tonian Marine Redox Environmentmentioning

confidence: 99%

Early Diagenetic Dolomite as a Potential Archive of Paleo‐redox Fluctuations in an Early Tonian Marine Basin?

Kang

Dong

et al. 2022

Acta Geologica Sinica (Eng)

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The Tonian Period witnessed important environmental changes and critical evolutionary innovations. Published iron speciation data suggest a global redox transition of mid‐depth seawaters from euxinic to ferruginous in early Tonian, but details of this transition remain unknown. This study explores Tonian stromatolitic carbonates as a possible archive of paleoenvironmental changes, through the investigation of dolomitic limestones and dolostones associated with stromatolites of the Weiji Formation in the Huaibei region of North China. Three types of dolomitization are recognized on the basis of petrographic and geochemical data. Type I and II dolomitization resulted in dolomitic limestones characterized by LREE depletions, MREE enrichments, positive yttrium anomalies, and a lack of europium anomalies, indicating early diagenetic dolomitization, possibly in the iron reduction zone and under the influence of bottom seawater. The lack of cerium anomalies in these carbonates suggests anoxia in shallow marine environments. The coexistence of ferroan/non‐ferroan dolomite crystals and overgrowth bands is interpreted as possible evidence for rapid fluctuations between iron‐rich and iron‐depleted conditions in pore‐waters or seawaters. In contrast, type III dolomitization resulted in pervasively dolomitized stromatolitic carbonates and likely represents late diagenetic processes. This study highlights the potential of early diagenetic dolomite as an archive for paleoenvironmental investigations.

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“…8) and voids within the sediment, a decrease of pH is required. pH variations may occur during early diagenesis at the boundary between the sulphatereduction and methanogenesis zones (Meister et al 2007(Meister et al , 2011Xu et al 2019). The formation of the mineral phases of gypsum and anhydrite follows the dissolution of the carbonates, probably due to pre-Miocene seawater-derived brines circulating within the East Pisco Basin sedimentary successions (Gioncada et al 2018b).…”

Section: A Complex Taphonomic Historymentioning

confidence: 99%

Taphonomy of a Panopea Ménard de la Groye, 1807 shell bed from the Pisco Formation (Miocene, Peru)

Bosio¹,

Bracchi²,

Malinverno³

et al. 2021

Comptes Rendus Palevol

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Invertebrate taphonomy can provide significant information about the post-mortem processes that affected the fossil record. In the East Pisco Basin of southern Peru, a Panopea Ménard de la Groye, 1807 shell bed was found in the upper Miocene strata of the Pisco Formation, hinting at a peculiar biostratinomic and diagenetic history. This bed contains abundant invertebrate fossil molds cemented by dolomite. The specimens of the deep infaunal bivalve, Panopea sp., occur together with bivalves representative of shallow infaunal species (Trachycardium sp. and Dosinia ponderosa [Gray, 1838]) and balanid barnacles, which are sessile encrusters. The Panopea specimens host compound molds evidencing an abundant encrusting fauna, including serpulids, ?foraminifera, bryozoans, and barnacles that colonized the inner surfaces of the valves before their final burial. We hypothesize that short-term, storm-related processes exhumed the living bivalves, resulting in a sedimentological concentration of relatively well-preserved shells. After the death of the exhumed bivalves, the inner surfaces of the articulated Panopea shells, representing hard-substratal, sheltered environments on an otherwise unstable sandy seafloor (i.e., “benthic islands”), were colonized by different encrusting organisms. Following the final burial, dolomite precipitated, cementing the sediment infill of the valves. Lastly, a decrease of pH occurred at the sulfate reduction-methanogenesis boundary, inducing the dissolution of the shell carbonate.

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Can Primary Ferroan Dolomite and Ankerite Be Precipitated? Its Implications for Formation of Submarine Methane-Derived Authigenic Carbonate (MDAC) Chimney

Cited by 12 publications

References 100 publications

The Formation of Authigenic Carbonates at a Methane Seep Site in the Northern Part of the Laptev Sea

The Formation of Authigenic Carbonates at a Methane Seep Site in the Northern Part of the Laptev Sea

Early Diagenetic Dolomite as a Potential Archive of Paleo‐redox Fluctuations in an Early Tonian Marine Basin?

Taphonomy of a Panopea Ménard de la Groye, 1807 shell bed from the Pisco Formation (Miocene, Peru)

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