Oxygen and sulphur isotopes of gypsum from the Mogilno Salt Dome cap-rock (Central Poland)

Jaworska, Joanna; Wilkosz, Paweł

doi:10.7306/gq.1019

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…A preserved primary selenitic texture is also unlikely, considering (i) the scarcity of swallow-tail twin habitus and (ii) the diagenetic transformations that must have affected the evaporite during burial. Similar, macro-crystalline textures have been described in the residual cap-rock of salt diapirs in Poland (Jaworska and Wilkosz, 2012) and in Italy (Lugli, 2001). In these settings, the gypsum crystals have grown at shallow depth, in the phreatic zone, from the hydration of anhydrite grains left as a residual phase after the leaching of diapiric halite.…”

Section: Gf3 Diagenetic Secondary Crystalline Gypsumsupporting

confidence: 62%

“…The chaotic orientation of the gypsum crystals, the almost total absence of swallow-tail habitus and the anhydrite inclusions suggest this facies is not a primary one (e.g. Bąbel, 2004;Ortí, 2011) but rather results from the hydration of anhydrite rocks (Lugli, 2001;Jaworska, 2012;Jaworska and Wilkosz, 2012;Jaworska and Nowak, 2013). A preserved primary selenitic texture is also unlikely, considering (i) the scarcity of swallow-tail twin habitus and (ii) the diagenetic transformations that must have affected the evaporite during burial.…”

Section: Gf3 Diagenetic Secondary Crystalline Gypsummentioning

confidence: 99%

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Sedimentology and depositional environment of the Late Eocene marine siliciclastic to evaporite transition in the Sivas Basin (Turkey)

Pichat

Hoareau

López

et al. 2021

Marine and Petroleum Geology

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Sivas foreland basin in Turkey recorded a salinity crisis during the Late Eocene resulting in evaporite accumulations thick enough to trigger intense halokinesis during the Oligo-Miocene. The salinity crisis is studied thanks to three sedimentological sections crossing the transition from the last marine deposits (Bözbel Formation) to the overlying evaporitic facies (Tuzhisar Formation) preserved from halokinetic deformations. The top of the Bözbel Formation presents flood-generated hyperpycnites developed in pro-delta to delta front settings. In the central part of the basin, such facies become increasingly sediment-starved with azoic calcareous facies interlayered with organic-rich shales. Such facies are ultimately capped by thick accumulations of gypsiferous turbiditic lobe deposits. Southward, the foredeep was partly isolated from the central domain due to the propagation of an anticline. There, the basal siliciclastic turbidites become increasingly gypsum-rich and are capped by a 45 m-thick mass-transport deposit enclosing olistoliths of gypsum and of ophiolitic rocks. Such gravity collapse deposits evolve upward to the same gypsiferous turbiditic lobes observed northward. Both transitional facies record the progressive confinement of the basin from the sea, likely due to the northward propagation of the fold-and-thrust belt located farther south. The evaporites started to precipitate in piggy-back evaporitic basins, along the highs of the fold-and-thrust belt, before being reworked gravitationally in the foredeep to the north, producing the high to low density gypsum turbidites. Finally, from north to south, the reworked evaporites are extensively covered by a >100 m thick, chaotic, prismatic gypsum mass likely resulting from the hydration of anhydrite grains left as a residual phase after the leaching of a significant amount of halite. The latter formed in a hypersaline marine-fed basin and have lately allowed mini-basin salt tectonics during Oligo-Miocene times.

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Section: Gf3 Diagenetic Secondary Crystalline Gypsumsupporting

confidence: 62%

Section: Gf3 Diagenetic Secondary Crystalline Gypsummentioning

confidence: 99%

Sedimentology and depositional environment of the Late Eocene marine siliciclastic to evaporite transition in the Sivas Basin (Turkey)

Pichat

Hoareau

López

et al. 2021

Marine and Petroleum Geology

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“…Some salt domes lack carbonate cap rock. Several Permian Zechstein salt diapirs in Germany and Poland exhibit only gypsum cap rock and lack associated hydrocarbons, carbonate, and elemental sulfur 2,43 . In these settings, δ 34 S values of dissolved sulfate in local aquifers indicate closed-system sulfate reduction, perhaps coupled with organic matter oxidation 44 rather than with the oxidation of petroleum or methane.…”

Section: Resultsmentioning

confidence: 99%

Carbonate formation in salt dome cap rocks by microbial anaerobic oxidation of methane

et al. 2019

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Major hydrocarbon accumulations occur in traps associated with salt domes. Whereas some of these hydrocarbons remain to be extracted for economic use, significant amounts have degraded in the subsurface, yielding mineral precipitates as byproducts. Salt domes of the Gulf of Mexico Basin typically exhibit extensive deposits of carbonate that form as cap rock atop salt structures. Despite previous efforts to model cap rock formation, the details of subsurface reactions (including the role of microorganisms) remain largely unknown. Here we show that cap rock mineral precipitation occurred via closed-system sulfate reduction, as indicated by new sulfur isotope data. 13C-depleted carbonate carbon isotope compositions and low clumped isotope-derived carbonate formation temperatures indicate that microbial, sulfate-dependent, anaerobic oxidation of methane (AOM) contributed to carbonate formation. These findings suggest that AOM serves as an unrecognized methane sink that reduces methane emissions in salt dome settings perhaps associated with an extensive, deep subsurface biosphere.

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Raman spectroscopy of organic matter and rare minerals in the Kłodawa Salt Dome (Central Poland) cap-rock and Triassic cover – Indicators of hydrothermal solution migration

Toboła

Botor

2020

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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Oxygen and sulphur isotopes of gypsum from the Mogilno Salt Dome cap-rock (Central Poland)

Cited by 3 publications

References 28 publications

Sedimentology and depositional environment of the Late Eocene marine siliciclastic to evaporite transition in the Sivas Basin (Turkey)

Sedimentology and depositional environment of the Late Eocene marine siliciclastic to evaporite transition in the Sivas Basin (Turkey)

Carbonate formation in salt dome cap rocks by microbial anaerobic oxidation of methane

Raman spectroscopy of organic matter and rare minerals in the Kłodawa Salt Dome (Central Poland) cap-rock and Triassic cover – Indicators of hydrothermal solution migration

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