Multistage dolomitization in Late Jurassic–Early Cretaceous platform carbonates (Berdiga Formation), Başoba Yayla (Trabzon), NE Turkey: Implications of the generation of magmatic arc on dolomitization

Kırmacı, M. Ziya; Yıldız, Merve; Kandemir, Raif; Eroğlu-Gümrük, Tuğba

doi:10.1016/j.marpetgeo.2017.10.018

Cited by 26 publications

(16 citation statements)

References 55 publications

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“…However, Kırmacı et al (2018) reported similar types of replacive dolomite as well as the other types in the Trabzon area (NE Turkey). Such a large-scale dolomitization generally necessitate high amounts of magnesium source in order to pervasively replace the host limestone (Machel 2004;Davies and Smith 2006) Adam and Al-Aasm 2017).…”

Section: Source Of Magnesium and Dolomitization Mechanismmentioning

confidence: 72%

“…However, Fe and Mn concentrations of all dolomite types are considerably higher than Başoba Yayla dolomites which are located in northern part of the Eastern Pontide and formed at shallow to intermediate burial depth (Kırmacı et al 2018). Therefore, the extremely high Fe and Mn values are probably related to the epithermal vein polymetallic mineralization.…”

Section: Early To Medium Burial Stagementioning

confidence: 84%

“…Na concentrations of replacive dolomite types (74-220 ppm) are consistent with those deposited from normal seawater (about 110-160 ppm) (Veizer 1983;Qing and Mountjoy 1994b). The lower Na concentrations in a few samples are attributed recrystallization of dolomite by Nadepleted hydrothermal fluids (Kırmacı et al 2018). Depletion in Sr concentrations (56-243 ppm) in replacive dolomite can be also related to recrystallization, because calcian dolomites which deposited from normal seawater, has nearly 250 ppm in Sr concentration (Fig.…”

Section: Source Of Magnesium and Dolomitization Mechanismmentioning

confidence: 97%

“…The recrystallization of dolomite involved several geochemical changes including a negative shift in δ 18 O isotopes (Kupecz et al 1993). Assuming that the origin of dolomitizing fluids was remnant Late Jurassic-Early Cretaceous seawater, then the measured δ 18 O values are more depleted than calculated δ 18 O values for the replacive dolomites according to the dolomite-fluid fractionation equation ( (Kırmacı et al 2018). This is also supported by the homogenization temperatures in the core of Fdd dolomite crystals (85-170) which necessitate such 2.2-4.5 km burial depth.…”

Section: Early To Medium Burial Stagementioning

confidence: 99%

“…In this region, Berdiga Formation was investigated by many researchers in terms of its stratigraphic, lithologic and structural attributes (e.g. Taslı 1991;Kırmacı 1992;Koch et al 2008 and many others), but little efforts have been made to contribute to the understanding of the origin of dolomitization (Kırmacı et al 2018). Moreover, massive dolomite bodies of Berdiga Formation hosts important economic mineralizations (Pb-Zn-Cu-Au-Ag) in Hazine Mağara area, which comprises one of the typical exposures of the succession in the southern part of Eastern Pontides (Akçay et al 2011).…”

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confidence: 99%

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Geochemical characteristics of Upper Jurassic – Lower Cretaceous platform carbonates in Hazine Mağara, Gümüşhane (northeast Turkey): implications for dolomitization and recrystallization

2019

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The Upper Jurassic – Lower Cretaceous Berdiga Formation of the Eastern Pontides, Turkey, represents a carbonate platform succession composed of pervasively dolomitized intra-shelf to deep-shelf facies. In this area, polymetallic deposits occur as veins and lenses within the Berdiga Formation in close proximity to its upper contact with the overlying formation. Three different types of replacive dolomites occur in the formation: (i) microcrystalline dolomite, (ii) fabric-preserving dolomite, and (iii) fabric-destructive dolomite. Replacive dolomites are Ca rich and nonstoichiometric (Ca56–58Mg42–44) and are characterized by a pronounced negative shift in oxygen (–11.38‰ to –4.05‰ Vienna Pee Dee Belemnite (VPDB)), δ13C values of 0.69‰ to 3.13‰ VPDB, radiogenic 87Sr/86Sr ratios (0.70753 to 0.70884), and extremely high Fe (2727–21 053 ppm) and Mn (1548–27 726 ppm) contents. All dolomite samples have low Y/Ho ratios (23–40), and they also contain highly variable contents of rare earth elements (REE) (7–41). REE patterns of dolomites normalized to Post-Archean Australian shale show a distinct positive Eu anomaly (1.3–2.1) and slightly flattened Ce anomalies (0.8–1.1). Integration of petrographic and geochemical studies reveals the history of a variety of diagenetic processes highly affected by hydrothermal alteration, which include dolomitization, recrystallization, dissolution, silicification, and pyrite mineralization associated with the emplacement of the polymetallic mineralization.

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Section: Source Of Magnesium and Dolomitization Mechanismmentioning

confidence: 72%

Section: Early To Medium Burial Stagementioning

confidence: 84%

Section: Source Of Magnesium and Dolomitization Mechanismmentioning

confidence: 97%

Section: Early To Medium Burial Stagementioning

confidence: 99%

mentioning

confidence: 99%

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Geochemical characteristics of Upper Jurassic – Lower Cretaceous platform carbonates in Hazine Mağara, Gümüşhane (northeast Turkey): implications for dolomitization and recrystallization

2019

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Microfacies and geochemistry of Kimmeridgian limestone strata in the Eastern Pontides (North‐East Turkey): Palaeoclimate and palaeoenvironmental influence on organic matter enrichment

Özyurt,

Kırmacı

2024

The Depositional Record

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Kimmeridgian limestone (KL) strata are one of the best examples of peritidal carbonates that record palaeogeographical and palaeoclimate conditions in the Eastern Pontides, Eastern Black Sea region. These Kimmeridgian limestone strata consist of well‐preserved dark grey lime‐mudstones that serve as essential archives for various geochemical proxies. This study presents new data on trace elements, rare earth elements and stable isotopes (δ18O, δ13C) to enhance our understanding of the palaeoclimate, weathering patterns, salinity, redox conditions and productivity during the deposition of these strata. Furthermore, organic chemistry data, including total organic carbon, Rock‐Eval (S1, S2, S3, HI, OI) and production index, are presented to discuss their hydrocarbon potential. The Kimmeridgian limestone strata exhibit relatively high total organic carbon content (0.16–0.22%) with an average of 0.19%, δ18O values ranging from −2.12 to −0.69‰, and δ13C values ranging from 1.42 to 2.09‰. Additionally, they display distinct rare earth element characteristics such as low La/YbN (0.64–1.00) ratios, varying Gd*/Gd (0.54–1.16) ratios, high Eu/Eu* (1.19–1.84) ratios and Ce/Ce* (0.91–1.16) ratios. The Kimmeridgian limestone strata also exhibit chondritic Y/Ho (30.48) and Zr/Hf (40.35) ratios, relatively high redox‐sensitive element values, low Ga/Rb (0.10–1.10; an average of 0.29) ratios and high K2O/Al2O3 ratios (0.2–0.40; an average of 0.27). According to the geochemical results of this study that are integrated with published stratigraphy and palaeontological data, the Kimmeridgian limestone strata are interpreted as having been deposited in a shallow subtidal lagoon environment or a partly protected interior ramp setting. Although sea‐level fluctuations influenced the palaeoenvironmental changes, ocean circulation along the inner platform supplied nutrients to the basin. The possible occurrence of low‐temperature water/rock interaction under reduced oxygen conditions contributed to additional element flux. Palaeoclimate indices suggest the existence of an aridification event, wherein arid climate played an important role in low weathering input, organic matter source, productivity, evaporation and salinity enhancement. The climate, accompanied by sedimentary factors, facilitated enhanced productivity, a balanced sedimentation rate and the preservation of organic matter under reducing conditions. Contrary to the anticipated outcome, considering the high productivity and anoxic depositional conditions suggested by microfacies and inorganic geochemical results, the over‐maturation processes have resulted in a notable decline in the organic matter content and hydrocarbon potential of the samples.

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Geochemistry of the Aptian bituminous limestones in Gümüşhane area, Eastern Black Sea region: new insight into paleogeography and paleoclimate conditions

Özyurt

2023

Acta Geochim

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Multistage dolomitization in Late Jurassic–Early Cretaceous platform carbonates (Berdiga Formation), Başoba Yayla (Trabzon), NE Turkey: Implications of the generation of magmatic arc on dolomitization

Cited by 26 publications

References 55 publications

Geochemical characteristics of Upper Jurassic – Lower Cretaceous platform carbonates in Hazine Mağara, Gümüşhane (northeast Turkey): implications for dolomitization and recrystallization

Geochemical characteristics of Upper Jurassic – Lower Cretaceous platform carbonates in Hazine Mağara, Gümüşhane (northeast Turkey): implications for dolomitization and recrystallization

Microfacies and geochemistry of Kimmeridgian limestone strata in the Eastern Pontides (North‐East Turkey): Palaeoclimate and palaeoenvironmental influence on organic matter enrichment

Geochemistry of the Aptian bituminous limestones in Gümüşhane area, Eastern Black Sea region: new insight into paleogeography and paleoclimate conditions

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