Origin of rift basins

Artemyev, M.E.; Artyushkov, Ye. V.

doi:10.1080/00206816909475092

Cited by 3 publications

(1 citation statement)

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“…Эти значения позволяют предполагать, что самая тонкая кора приурочена к впадине озера Байкал. Утонение коры под впадиной озера Байкал может быть связано с ее растяжением в процессе рифто-генеза [Artemyev, Artyushkov, 1969]. Самые низкие значения мощности (30 км) ниже мощностей, ха-рактерных для Сибирского кратона, которые, по данным последней сводки [Cherepanova et al, 2013], находятся в диапазоне от 38 до 46 км.…”

Section: обсуждение результатовunclassified

Crust and Mantle of the Baikal Rift Zone From P- And S-Wave Receiver Functions

Vinnik

Oreshin

Tsydypova³

et al. 2017

Geodin. tektonofiz.

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Abstract:We have obtained P-wave and S-wave receiver functions for 10 broadband seismograph stations in the Baikal rift zone (BRZ) and inverted them for seismic velocity models of the crust and upper mantle. The thinnest crust (30-35 km) is found in the Baikal basin, the thickest in the East Sayan uplift (45-50 km). Intermediate values (40 km) are found in the BRZ at distances around 100 km from Lake Baikal. A high (at least 1.8) Vp/Vs ratio is observed in the middle and lower crust. It exceeds 2.0 at some stations. In our opinion, the highest Vp/Vs ratios are due to fluid-filled porosity with a high pore pressure. The seismic lithosphere -asthenosphere boundary (LAB) is manifested by a shear velocity drop from 4.5 km/s to 4.0-4.2 km/s. Beneath the Baikal basin, the LAB is located at a depth not more than 50 km, and the S velocity drop is maximal (10 %). A similar structure is found outside the basin, underneath a segment of the East Sayan uplift. At other locations in the BRZ, a typical depth of the LAB varies from 80 to 90 km. Having considered changes in the depth of the 410 km seismic discontinuity, we cannot find any evidence of an elevated temperature of a hypothetical thermal plume beneath the BRZ.Key words: сrust; Vp/Vs ratio; fluid-filled porosity; mantle; mantle plume; lithosphere -asthenosphere boundary GEODYNAMICS & TECTONOPHYSICS P U B L I S H E D B Y T H E I N S T I T U T E O F T H E E A R T H ' S C R U S T S I B E R I A N B R A N C H O F R U S S I A N A C A D E M Y O F S C I E N C E S R e c e n t G e o d y n a m i c s RESEARCH ARTICLEReceived: August 13, 2017 Revised: September 20, 2017 Recommended by K.Zh. Seminsky Accepted: October 18, 2017For citation : Vinnik L.P., Oreshin S.I., Tsydуpova L.R., Mordvinova V.V., Kobelev M.M., Khritova M.A., Tubanov Ts.A., 2017. Crust and mantle of the Baikal rift zone from P-and S-wave receiver functions.

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Section: обсуждение результатовunclassified

Crust and Mantle of the Baikal Rift Zone From P- And S-Wave Receiver Functions

Vinnik

Oreshin

Tsydypova³

et al. 2017

Geodin. tektonofiz.

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Thermal Effects of the Formation of Atlantic Continental Margins by Continental Break up

Sleep

1971

Geophysical Journal International

479

175

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Summary The thermal history of Atlantic continental margins resembles that of the oceanic crust as it spreads away from a mid‐oceanic ridge, since the margin was formed when a ridge began spreading beneath a pre‐existing continent. During break‐up the thickness of the continental crust along the new margin was reduced by subareal erosion and subcrustal processes. Afterwards the continental shelf subsided, probably due to thermal contraction of the lithosphere. The observed subsidence rate on the Atlantic and Gulf coasts of the United States declined exponentially with a time constant of about 50 My, as it does for ridges. Except for the Florida peninsula, deviations of the observed sedimentation from a smooth curve with respect to time could be associated with eustatic changes and variations in the supply of sediments. The subsidence rate of basins in the mid‐continent of North America also decreases with a 50 My time constant. In Kansas a subcrustal process must have thinned the crust and initiated subsidence as a sequence of thinly bedded sediments beneath the basin is uneroded.

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Continental Margin Subsidence and Heat Flow: Important Parameters in Formation of Petroleum Hydrocarbons

Royden¹

1980

Bulletin

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Origin of rift basins

Cited by 3 publications

References 3 publications

Crust and Mantle of the Baikal Rift Zone From P- And S-Wave Receiver Functions

Crust and Mantle of the Baikal Rift Zone From P- And S-Wave Receiver Functions

Thermal Effects of the Formation of Atlantic Continental Margins by Continental Break up

Continental Margin Subsidence and Heat Flow: Important Parameters in Formation of Petroleum Hydrocarbons

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