Oblique rift geometry of the West Siberian Basin: tectonic setting for the Siberian flood basalts

Allen, Mark B.; Anderson, Lester; Searle, R. C.; Буслов, М. М.

doi:10.1144/0016-76492006-096

Cited by 50 publications

(27 citation statements)

References 22 publications

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“…It overlaps and crosses the eastern high‐density arch evident in Figure 8b. The Yenisey anomaly is located east of the Khudosei rift, an observation already made by Allen et al [2006] from the interpretation of magnetic data. At its northern end (85°E, 70°N), the Khudosei anomaly bends eastward into the Yenisey‐Khatanga trough.…”

Section: Discussionsupporting

confidence: 53%

“…Linear gravity highs can be identified and these highs correlate with highs in the magnetic anomaly. The structures associated with these highs are interpreted to be linear positive masses related to rift‐graben units [ Pavlov , 1995; Allen et al , 2006]. The most prominent are the Koltogory‐Urengoi, the Khudottei, and the Khudosei grabens.…”

Section: Discussionmentioning

confidence: 99%

“…In the northern part of the basin, three linear highs are evident. These highs are associated with graben structures [ Allen et al , 2006; Peterson and Clarke , 1991; Pavlov , 1995], in particular the Khudottei (west), Koltogory Urengoi (central) and Khudosei (east) graben. The basin itself is bounded by positive free‐air gravity anomalies: the Urals (+60 mGal), the Kazakh highlands to the South (+20 mGal) and the East Siberian platform to the east.…”

Section: Databases Used In the Studymentioning

confidence: 99%

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New insights into the basement structure of the West Siberian Basin from forward and inverse modeling of GRACE satellite gravity data

Braitenberg

Ebbing

2009

J. Geophys. Res.

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[1] The oil-and gas-rich West Siberian Basin is underlain by a layer of flood basalts of late Permian-Triassic age that are coeval with the Siberian traps. The extent and thickness of the basalts are unknown, but knowing their thickness is important for discussions on the end-Permian mass extinction because basalt volume constrains estimates of emitted volatiles. We have used GRACE satellite and terrestrial gravity data to study the structure of the crust and basalt distribution. Published seismic sections are used to constrain the sediment isopachs and to estimate a depth-density function. We use published models of crustal thickness and basement depth to reduce the observed gravity field to the basement level. The resulting three-dimensional density model gives information on density anomalies in the lower crust and upper mantle and on the basalt thickness. We identify several rift-graben structures that are presumably filled with basalt. The lower crust below the West Siberian Basin shows considerable density variations, and these variations allow the region to be divided into four major blocks. The eastern part of the basin, toward the Siberian platform, shows an arch-shaped density increase in the lower crust that is accompanied by a linear high-density anomaly at shallower depths. Our work demonstrates the way in which the GRACE-gravity field can be applied to map geological structures like buried rifts and large basins. The same techniques can be used for other large, remote basins such as those in cratonic South America.Citation: Braitenberg, C., and J. Ebbing (2009), New insights into the basement structure of the West Siberian Basin from forward and inverse modeling of GRACE satellite gravity data,

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Section: Databases Used In the Studymentioning

confidence: 99%

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New insights into the basement structure of the West Siberian Basin from forward and inverse modeling of GRACE satellite gravity data

Braitenberg

Ebbing

2009

J. Geophys. Res.

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“…The present-day Yenisey -Khatanga Basin might be a failed rift superimposed on a rifted passive margin. A triple junction was located along the present-day NW margin of the Siberian Craton (Allen et al 2006). Rifting resulted in the emplacement of flood basalts across Tunguska Basin and deposition of up to 2 km of volcanic and volcanicclastic rocks in the western part of the Yenisey -Khatanga Basin.…”

Section: Late Permian To Early Triassicmentioning

confidence: 99%

Chapter 27 Geology and petroleum potential of the north and east margins of the Siberian Craton, north of the Arctic Circle

Klett

Wandrey

Pitman

2011

Memoirs

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The Siberian Craton consists of crystalline rocks and superimposed Precambrian sedimentary rocks deposited in rift basins. Palaeozoic rocks, mainly carbonates, were deposited along the margins of the craton to form an outwardly younger concentric pattern that underlies an outward-thickening Mesozoic sedimentary section. The north and east margins of the Siberian Craton subsequently became foreland basins created by compressional deformation during collision with other tectonic plates. The Tunguska Basin developed as a Palaeozoic rift/sag basin over Proterozoic rifts. The geological provinces along the north and east margins of the Siberian Craton are immature with respect to exploration, so exploration-history analysis alone cannot be used for assessing undiscovered petroleum resources. Therefore, other areas from around the world having greater petroleum exploration maturity and similar geological characteristics, and which have been previously assessed, were used as analogues to aid in this assessment. The analogues included those of foreland basins and rift/sag basins that were later subjected to compression. The US Geological Survey estimated the mean undiscovered, technically recoverable conventional petroleum resources to be approximately 28 billion barrels of oil equivalent, including approximately 8 billion barrels of crude oil, 103 trillion cubic feet of natural gas and 3 billion barrels of natural gas liquids.

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“…Hamilton 1970;Ziegler 1988Ziegler , 1989Ş engör & Natal'in 1996;Allen et al 2006;Vyssotski et al 2006). However, this potential link with Late Palaeozoic orogenic collapse is more difficult to explain in the South Kara Basin if the main compressional deformation in Novaya Zemlya occurred in Late Triassic time (i.e.…”

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confidence: 99%

Offset and curvature of the Novaya Zemlya fold-and-thrust belt, Arctic Russia

Scott

Howard

Guo

et al. 2010

PGC

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The Novaya Zemlya archipelago contains a predominantly west-vergent fold-and-thrust belt that separates two contrasting hydrocarbon basins with enigmatic subsidence histories. On the foreland side is the deep depression of the eastern Barents Shelf that hosts the Shtokman gas condensate discovery; on the hinterland side is the South Kara Basin, an offshore continuation of the gas-dominated northern West Siberian Basin. Much of the compressional deformation recorded in Novaya Zemlya appears to have been later than the onset of subsidence in adjacent basins, and may therefore be expected to have had a potentially significant influence on hydrocarbon systems within them. Two characteristics of Novaya Zemlya immediately stand out on any topographic map: the c. 600 km westward offset compared with the remainder of the Uralian Orogen and the planview curvature (convex towards the Barents Shelf). Any regional tectonic model developed for the Novaya Zemlya fold-and-thrust belt must be able to explain these first-order features, and a wide range of mechanisms, geometries and timings has been proposed in the literature. However, as far as we are aware, there has been no previous attempt to link the geometry of structures on the archipelago with a potential mechanism that explains their curvature in plan view. Using field observations, information on geological maps and interpretation of satellite imagery, we demonstrate the link between structural geometries in Novaya Zemlya and the basins of the adjacent eastern Barents Shelf. We find no evidence to support previous interpretations of the fold-and-thrust belt as an orocline (bending of an originally straight deformation belt) or a far-travelled thin-skinned allochthon, and conclude that the offset from the remainder of the Uralian Orogen is a primary feature that results from an original embayment on the margin of Baltica.

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Oblique rift geometry of the West Siberian Basin: tectonic setting for the Siberian flood basalts

Cited by 50 publications

References 22 publications

New insights into the basement structure of the West Siberian Basin from forward and inverse modeling of GRACE satellite gravity data

New insights into the basement structure of the West Siberian Basin from forward and inverse modeling of GRACE satellite gravity data

Chapter 27 Geology and petroleum potential of the north and east margins of the Siberian Craton, north of the Arctic Circle

Offset and curvature of the Novaya Zemlya fold-and-thrust belt, Arctic Russia

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