Rhizoid Structures of Axophyllum Cavum Trautschold, 1879 (Rugosa) in the Middle Carboniferous of the Moscow Basin: Morphology and Origin

There's no doubt that nowadays detrital zircon U-Pb geochronology is actually required method of sedimentary basins analysis. Furthermore, this approach may have a lot of applications, such as a stratigraphic correlation. Here we present the first results of U&#8211;Pb LA&#8211;ICP&#8211;MS dating of detrital zircon from the Permian-Triassic red beds located within the Moscow Basin of the East European platform. Two outcrops have been studied: the Zhukov Ravine P/T boundary reference section and the Nedubrovo strata with uncertain stratigraphic position (uppermost Permian or lower Triassic?).U&#8211;Pb ages of detrital zircon grains have been obtained for two samples &#8211; the Upper Permian and Lower Triassic age, which were taken in the proximity to the Permian&#8211;Triassic boundary in the Zhukov Ravine. Corresponding age distributions show contrasting provenance of the studied sedimentary rocks, pointing out that principal change in source of clastic material occurred on the Paleozoic-Mesozoic boundary. It means that detrital zircon U&#8211;Pb geochronology can be used as an additional independent tool for stratigraphic correlation of the Permian-Triassic red beds, at least within the Moscow Basin. We demonstrate this in the case of the Nedubrovo section with debated (Permian or Triassic?) stratigraphic position: the obtained data on detrital zircons persuasively suggests Early Triassic age of the Nedubrovo strata.This study is supported by the Russian Foundation for Basic Research (project no. 18-05-00593).

Download Full-text

The Yenisei-Khatanga Composite Tectono-Sedimentary Element, Northern Siberia

Geological Society London Memoirs ◽

10.1144/m57-2021-15 ◽

2021 ◽

pp. M57-2021-15

Author(s):

E. V. Deev ◽

G. G. Shemin ◽

V. A. Vernikovsky ◽

O. I. Bostrikov ◽

P. A. Glazyrin ◽

...

Keyword(s):

Siberian Craton ◽

Middle Triassic ◽

Foreland Basin ◽

Early Carboniferous ◽

Source Rocks ◽

Total Thickness ◽

Petroleum Potential ◽

Early Paleocene ◽

Middle Carboniferous ◽

Severnaya Zemlya

AbstractThe Yenisei-Khatanga Composite Tectono-Sedimentary Element (YKh CTSE) is located between the Siberian Craton and the Taimyr-Severnaya Zemlya fold-and-thrust belt. The total thickness of the Mesoproterozoic-Cenozoic sediments of YKh CTSE reaches 20 to 25 km. They are divided into four tectono-sedimentary elements (TSE): (i) Mesoproterozoic-early Carboniferous Siberian Craton continental margin, (ii) middle Carboniferous-Middle Triassic syn-orogenic Taimyr foreland basin, (iii) late Permian-Early Triassic syn-rift, and (iv) Triassic-Early Paleocene post-rift. The last one is the most important in terms of its petroleum potential and is the most drilled part of the CTSE. Its thickness accounts for half of the total thickness of YKh CTSE. The margins of the post-rift TSE and the inner system of inversion swells and adjacent troughs and depressions were shaped by three tectonic events: (i) middle Carboniferous-Middle Triassic Taimyr orogeny, (ii) Late Jurassic-Early Cretaceous Verkhoyansk orogeny, (iii) Late Cenozoic uplift. These processes led to more intense migration of hydrocarbons, the trap formation and their infill with hydrocarbons. Triassic, Jurassic, and Lower Cretaceous source rocks are mostly gas-prone, and among 20 discovered fields in Jurassic and Cretaceous plays, 17 are gas or mixed-type fields.

Download Full-text

Finnmark Platform Composite Tectono-Sedimentary Element, Barents Sea

Geological Society London Memoirs ◽

10.1144/m57-2020-20 ◽

2021 ◽

pp. M57-2020-20

Author(s):

E. Henriksen ◽

D. Ktenas ◽

J. K. Nielsen

Keyword(s):

High Frequency ◽

Oil And Gas ◽

Barents Sea ◽

Upper Jurassic ◽

Source Rocks ◽

Basement Rocks ◽

Sea Bottom ◽

Middle Carboniferous ◽

Uralian Orogen ◽

Glacial Periods

AbstractThe Finnmark Platform Composite Tectono-Sedimentary Element (CTSE), located in the southern Barents Sea, is a northward-dipping monoclinal structural unit. It covers most of the southern Norwegian Barents Sea where it borders the Norwegian Mainland. Except for the different age of basement, the CTSE extends eastwards into the Kola Monocline on the Russian part of the Barents Sea.The general water depth varies between 200-350 m, and the sea bottom is influenced by Plio-Pleistocene glaciations. A high frequency of scour marks and deposition of moraine materials exists on the platform areas. Successively older strata sub-crop below the Upper Regional Unconformity (URU, which was) formed by several glacial periods.Basement rocks of Neoproterozoic age are heavily affected by the Caledonian Orogeny, and previously by the Timanide tectonic compression in the easternmost part of the Finnmark Platform CTSE.Depth to crystalline basement varies considerably and is estimated to be from 4-5 to 10 km. Following the Caledonian orogenesis, the Finnmark Platform was affected by Lower to Middle Carboniferous rifting, sediment input from the Uralian Orogen in the east, the Upper Jurassic / Lower Cretaceous rift phase and the Late Plio-Pleistocene isostatic uplift.A total of 8 exploration wells drilled different targets on the platform. Two minor discoveries have been made proving presence of both oil and gas and potential sandstone reservoirs of good quality identified in the Visean, Induan, Anisian and Carnian intervals. In addition, thick sequences of Perm-Carboniferous carbonates and spiculitic chert are proven in the eastern Platform area. The deep reservoirs are believed to be charged from Paleozoic sources. A western extension of the Domanik source rocks well documented in the Timan-Pechora Basin may exist towards the eastern part of the Finnmark Platform. In the westernmost part, charge from juxtaposed down-faulted basins may be possible.

Download Full-text

On the influence of River Basin Morphology and Climate on Hydrogeomorphic Floodplain delineations

Advances in Water Resources ◽

10.1016/j.advwatres.2021.104078 ◽

2021 ◽

pp. 104078

Author(s):

A. Annis ◽

M. Karpack ◽

R.R. Morrison ◽

F. Nardi

Keyword(s):

River Basin ◽

Basin Morphology

Download Full-text

Modern Analogues of Sedimentation of Lower Permian Reservoirs in the Dnieper-Donets Depression

10.2118/208505-ms ◽

2021 ◽

Author(s):

Valentyn Loktyev ◽

Sanzhar Zharkeshov ◽

Oleg Gotsynets ◽

Oleksandr Davydenko ◽

Mikhailo Machuzhak ◽

...

Keyword(s):

Donets Basin ◽

Lower Permian ◽

River Channels ◽

Current Time ◽

Meandering Channels ◽

The North ◽

Complex Picture ◽

Middle Carboniferous ◽

The Indian Ocean ◽

Desert Dunes

Abstract The paper considers the problematics of identifying proper analogues for understanding carbonate and clastic reservoir distribution and prediction in the Lower Permian and Upper and Lower Carboniferous within the Dnieper-Donets basin. The focus of the exploration team was finding meandering rivers. This choice was proven good in mapping reservoirs and finding traps deeper in the Upper and Middle Carboniferous, although for Permian clastic section the approach was not helpful. The second option was desert dunes, but poor sorting of reservoirs suggests a more complex picture. Analogues such as desert environment is quite logical for describing Lower Permian as aridic climate, with red and brown shales and sands. Lower Permian reservoirs have a moon-like shape in the vertical sections that could be easily mistaken for river channels, but in such a dry climate, it is very likely water flow channels with sporadic hurricane-related activities. Core and logs shows chaotic grain sizes, but more with fine grains with almost no coarse grains. The source of sedimentary material could be mountains of Ukrainian Rock Shield from the South and Voronezh massif from the North. This conceptual model is proposing not to look for meandering channels, but more for braided channels with poorly sorted material. The current time analogue could be the Oman desert between the mountains and peninsula. From satellite images, braided channels are clearly visible in the direction towards the Indian Ocean. The channels’ internal structure is quite heterogeneous. This method suggests exploration targets with possible widths of the channels as big as hundreds of meters and their lengths under 10 and between 10-20 kilometres maximum.

Download Full-text