Lower Oligocene Menilite Beds, Polish Outer Carpathians: supposed deep-sea flysch locally reinterpreted as shelfal, based on new sedimentological, micropalaeontological and organic-geochemical data

Dziadzio, Piotr S.; Matyasik, I.; Garecka, Małgorzata; Szydło, Andrzej

doi:10.18668/pn2016.213

Cited by 15 publications

(24 citation statements)

References 72 publications

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“…These data are cor re lated with sed i men tary pro cesses and bi otic events re flect ing en vi ron mental cri ses dur ing the Paleogene. Changes in the di ver sity and num ber of foraminifera ob served by the au thors are re ported with re spect to both other microfossils (radio lar ians, di a toms, algae) and geo chem i cal data that are part of ar chived and published stud ies Gucwa, 1977, 1980;Muszyñski et al, 1979;Gucwa and OEl¹czka, 1980;Olszewska, 1984Olszewska, , 1985Gucwa, 1990;Gucwa and Poprawa, 1996;Dziubiñska and Narêbski, 2004;Bieñkowska-Wasiluk, 2010;Zieliñska, 2010Zieliñska, , 2017Garecka, 2012;Uchman, 2012, 2013;Szyd³o and Olszewska, 2012;OEl¹czka et al, 2014;Dziadzio et al, 2016). The re sults com piled by au thors are pre sented against the geo chron ol ogy and the strati graphic po si tion of the stud ied de pos its (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…More over, hy dro car bon biomarkers, in clud ing norhopa nes/hopa nes, isoprenoids, diasteranes and oleananes, have been doc u mented in the Meniliite shales of the Silesian and Magura units. Hopane and sterane biomarkers have also been doc umented in the Up per Eocene green shales of the Silesian Unit (Sêkówka), which un der lie the Menilite Shales For ma tion includ ing si li ceous marls (Dziadzio et al, 2016).…”

Section: Oligocenementioning

confidence: 99%

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Environmental stress in the northern Tethys during the Paleogene: a review of foraminiferal and geochemical records from the Polish Outer Carpathians

Olszewska

Szydło

2017

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Olszewska, B., Szyd³o, A., 2017. En vi ron men tal stress in the north ern Tethys dur ing the Paleogene: a re view of foraminiferal and geo chem i cal re cords from the Pol ish Outer Carpathians. Geo log i cal Quar terly, 61 (3): 682-695, doi: 10.7306/gq.1369 Dur ing the Paleogene, the area of the north ern Tethys was con trolled by a tur bid ity sys tem stim u lated by di a strophic and geodynamic pro cesses. These fac tors con trib uted to the dis per sion and rapid ox y gen a tion of or ganic de bris. Its ac cu mu lation was a con se quence of stag nant bot tom wa ter con di tions that pe ri od i cally oc curred in the ba sin. In these pe ri ods, in tense de com po si tion in ten si fied by hy dro ther mal and diagenetic pro cesses was as so ci ated with ox y gen con sump tion and the release of green house gases, which led to hypoxia and acid i fi ca tion. These phe nom ena in ten si fied by ther mal and den sity strat i fi ca tion had a ma jor im pact on the struc ture, evo lu tion and dis tri bu tion of biota. Stress as so ci ated with rap idly chang ing con di tions in duced by sed i men tary pro cess and upwelling re sulted in the dom i nance of forms that col o nized most sed i ments (Glomospira, Ammodiscus, Recurvoides, Rzehakina) and sur face wa ters (Guembelitria, Chiloguembelina, Globanomalina, Globigerina, Cassigerinella, Catapsydrax). At the time, foraminifera were lim ited to low-di ver si fied eutrophic as sem blages or were mainly re placed by si li ceous phytoplankton (radio lar ians and di a toms). Geo chem i cal data con firm that en vi ron men tal cri ses in the Paleogene ba sin took place un der chang ing ther mal con di tions that re flect global events (KTBE, PTME, EEOC and TTE). Ther mal stress fa vour ing the for ma tion of cer tain min er als or rocks oc ca sion ally oc curred dur ing the Paleocene to Eocene (sid er ite, phos phates) and dom i nated in the Early Oligocene (sil ica).

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Section: Methodsmentioning

confidence: 99%

Section: Oligocenementioning

confidence: 99%

Environmental stress in the northern Tethys during the Paleogene: a review of foraminiferal and geochemical records from the Polish Outer Carpathians

Olszewska

Szydło

2017

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“…The interval between 310 and 195 m contains frequent beds of Kliwa sandstones (Figs 3b,9). These sandstones are considered to be deep-marine deposits (Kotlarczyk and Uchmann, 2012;Miclaus et al, 2009), although Dziadzio et al (2006Dziadzio et al ( , 2016 assumed a shallow-water depositional environment. In the present paper the conventional interpretation was followed, and the thick, laterally continuous sandstone beds were interpreted as deep-water deposits representing the transition from a deep-marine channel fill to a depositional fan lobe (e.g.…”

Section: The Sandstone-rich Interval In the Lower Menilite Membermentioning

confidence: 99%

The Oligocene–miocene Menilite Formation in the Ukrainian Carpathians: A World‐class Source Rock

Rauball

Sachsenhofer

Bechtel

et al. 2019

Journal of Petroleum Geology

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This study investigates the hydrocarbon potential of Oligocene–Miocene shales in the Menilite Formation, the main source rock in the Ukrainian Carpathians. The study is based on the analysis of 233 samples collected from outcrops along the Chechva River in western Ukraine in order to analyse bulk parameters (TOC, Rock‐Eval), biomarkers and maceral composition. In Ukraine, the Menilite Formation is conventionally divided into Lower (Lower Oligocene), Middle (Upper Oligocene) and Upper (Lower Miocene) Members. The Early Oligocene and Early Miocene ages of the lower and upper members are confirmed by new nannoplankton data. The Lower Menilite Member is approximately 330 m thick in the study area and contains numerous chert beds and turbidite sandstones in its lower part together with organic‐rich black shales. The shales have a high content of silica which was probably derived from siliceous micro‐organisms. The TOC content of the shales frequently exceeds 20 wt.% and averages 9.76 wt.%. HI values range between 600 and 300 mgHC/gTOC (max. 800 mgHC/gTOC). The Middle Member contains thin black shale intervals but was not studied in detail. The Upper Member is about 1300 m thick in the study area and is composed mainly of organic‐rich shales. Chert layers are present near the base of the Member, and a prominent tuff horizon in the upper part represents a volcanic phase during shale deposition. The member grades into overlying molasse sediments. The average TOC content of the Upper Menilite succession is 5.17 wt.% but exceeds 20 wt.% near its base. Low Tmax and vitrinite reflectance measurements for the Lower (419°C and 0.24–0.34 %Rr, respectively) and Upper (425°C and 0.26–0.32 %Rr, respectively) Menilite Member successions indicate thermal immaturity. Biomarker and maceral data suggest a dominantly marine (Type II) organic matter input mixed with varying amounts of land‐plant derived material, and indicate varying redox and salinity conditions during deposition. Determination of the Source Potential Index (SPI) shows that the Menilite Formation in the study area has the potential to generate up to 74.5 tons of hydrocarbons per m2. The Chechva River outcrops therefore appear to have a significantly higher generation potential than other source rocks in the Paratethys realm. These very high SPI values for the Menilite Formation may explain why a relatively small area in Ukraine hosts about 70% of the known hydrocarbon reserves in the northern and eastern Carpathian fold‐thrust belt.

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“…Cechą charakterystyczną osadów budujących profil fałdu Gorlic jest ich wybitnie piaskowcowy charakter, począwszy od górnych warstw istebniańskich po dolne warstwy krośnieńskie. Innym istotnym faktem jest brak poziomu rogowcowego w spągu serii menilitowej, który zastąpiony jest kilkumetrowej miąższości serią margli krzemionkowych (Szymakowska, 1979;Dziadzio et al, 2016).…”

Section: Obszar Badań I Zarys Litostratygraficznyunclassified

Wykształcenie facjalne i korelacja profili warstw krośnieńskich z odsłonięć i otworów wiertniczych (fałd Gorlic, jednostka śląska, Karpaty)

Drozd¹,

Dziadzio²,

Stadtmüller³

2019

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Lower Oligocene Menilite Beds, Polish Outer Carpathians: supposed deep-sea flysch locally reinterpreted as shelfal, based on new sedimentological, micropalaeontological and organic-geochemical data

Cited by 15 publications

References 72 publications

Environmental stress in the northern Tethys during the Paleogene: a review of foraminiferal and geochemical records from the Polish Outer Carpathians

Environmental stress in the northern Tethys during the Paleogene: a review of foraminiferal and geochemical records from the Polish Outer Carpathians

The Oligocene–miocene Menilite Formation in the Ukrainian Carpathians: A World‐class Source Rock

Wykształcenie facjalne i korelacja profili warstw krośnieńskich z odsłonięć i otworów wiertniczych (fałd Gorlic, jednostka śląska, Karpaty)

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