Terrestrial heat flow of continental rifts

Lysak, S.V.

doi:10.1016/0040-1951(87)90076-x

Cited by 32 publications

(10 citation statements)

References 20 publications

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“…Thin, alkalic basalts were reported to be interbedded with Upper Jurassic strata in western Mongolia (Zorin et al, 1993a(Zorin et al, , 1993bShuvalov, 1968), but the exact location of these basalts, description of their contact relations, and absolute isotopic ages are not published, so it is impossible to evaluate these reports critically. In addition to the apparent lack of volcanics, we do not favor a rift-related setting because coal we sampled from the Jargalant locality has vitrinite reflectance values of 0.4%, suggesting a low post-Middle Jurassic heat flow more characteristic of flexural basins than riftrelated basins (Sclater et al, 1980;Lysak, 1987;Şengör, 1995).…”

Section: Sedimentary Basin Development and Inferred Tectonic Settingmentioning

confidence: 93%

Sedimentology and provenance of Mesozoic nonmarine strata in western Mongolia: A record of intracontinental deformation

Sjostrom¹,

Hendrix²,

Badamgarav³

et al. 2001

Paleozoic and Mesozoic Tectonic Evolution of Central and Eastern Asia: From Continental Assembly to Intracontinental Deformatio

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Western Mongolia is a structurally complicated and little-studied portion of the central Asia tectonic collage, yet contains well-exposed sequences ofMesozoic sedimentary strata that preserve an important record of ancient intraplate deformation. In order to document the record of Mesozoic sedimentary basin development and to provide a basis for interpreting the sedimentary record of intraplate deformation, we studied the sedimentology and provenance of Mesozoic strata at four locations in western Mongolia. Triassic sedimentary strata are missing across the study area, and Lower Jurassic strata unconformably overlie older rocks of various ages. Lower to Middle Jurassic basin fill in the northern portion of the study area is dominated by coarse, granite-bearing conglomerate and arkosic sandstone (Qm 35 F 49 L 16 ) with a volcanic-dominated lithic fraction (Qp 22 Lvm 63 Lsm 15 ). Paleocurrent indicators suggest southwest-directed sediment transport, reflecting uplift of an ancestral version of the Hanhöhiy Uul, a mountain range located north and east of the study area and composed mainly of Cambrian granite and associated volcanics. In the central portion of the study area, Lower to Middle Jurassic strata comprise an upward-fining kilometer-thick sequence from coarse matrix-supported fanglomerate to fine sandstone, shale, and coal suggestive of a mudload-dominated, meandering fluvial environment. Conglomerate clasts are dominantly basalt and granite, and sandstone is arkosic with higher QmFL%L and Qp-Lvm-Lsm%Lsm than equivalent sandstone to the north (Qm 41 F 35 L 24 ; Qp 24 Lvm 41 Lsm 35 ). Paleocurrent indicators suggest transport to the south-southwest. In the southernmost part of the study area, Lower through Upper Jurassic strata record a transition from mudload-dominated fluvial environments with abundant organic matter to fluvial flood-plain and/or mud flat with little organic matter and abundant calcisols. These strata are sharply overlain by

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Section: Sedimentary Basin Development and Inferred Tectonic Settingmentioning

confidence: 93%

Sedimentology and provenance of Mesozoic nonmarine strata in western Mongolia: A record of intracontinental deformation

Sjostrom¹,

Hendrix²,

Badamgarav³

et al. 2001

Paleozoic and Mesozoic Tectonic Evolution of Central and Eastern Asia: From Continental Assembly to Intracontinental Deformatio

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“…The flux within undisturbed blocks of the Moma and Baikal rifts can range from 40 ⋅ 10 À3 to 80 Á 10 À3 Wm À2 , while in the active faults the flux can reach as much as 100 ⋅ 10 À3 Wm À2 [c.f. Lysak, 1988;Duchkov et al, 1997]. At the same time, the geothermal heat flux within the continental slope is estimated to be between 85 ⋅ 10 À3 and 117 ⋅ 10 À3 Wm À2 , according to Drachev et al [2003].…”

Section: Modeling Permafrost Dynamics Under the Influence Of Long-termentioning

confidence: 99%

Modeling sub‐sea permafrost in the East Siberian Arctic Shelf: The Laptev Sea region

et al. 2012

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[1] Models of sub-sea permafrost evolution vary significantly in employed physical assumptions regarding the paleo-geographic scenario, geological structure, thermal properties, initial temperature distribution, and geothermal heat flux. This work aims to review the underlying assumptions of these models as well as to incorporate recent findings, and hence develop an up-to-date model of the sub-sea permafrost dynamics at the Laptev Sea shelf. In particular, the sub-sea permafrost model developed here incorporates thermokarst and land-ocean interaction theory, and shows that the sediment salinity and a temperature-based parametrization of the unfrozen water content are critical factors influencing sub-sea permafrost dynamics. From the numerical calculations, we suggest development of open taliks may occur beneath submerged thaw lakes within a large area of the shelf.

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“…[26] The architecture of the Baikal rift system is, in fact, different from many other continental rift systems to which it had been previously compared [Kazmin, 1991;Lipman et al, 1989;Lysak, 1987;Zorin and Lepina, 1985]. Basins within the East Africa rift system, the Ethiopian Rift, the Rio Grande Rift and the Gulf of Suez are arranged along a narrow long axis (the rift valley).…”

Section: Deep Seismic Reflection and Refraction Profiles Undermentioning

confidence: 99%

“…An alternative driving force for this rift system is an active asthenospheric upwelling in the vicinity of the rift system [e.g., Zorin and Lepina , 1985], farther to the SE [ Windley and Allen , 1993], or on a larger scale under Tibet, Mongolia, and parts of China [ Yin , 2000]. A variety of evidence about volcanism, deformation geometry, and thermal structure as well as comparisons with other rift systems, such as the East African rift system and the Rio Grande Rift [ Lipman et al , 1989; Lysak , 1987], have been used to support the different points of view. However, these lines of evidence are generally indicative of the particular combination of the above physical parameters, not the driving forces.…”

Section: Introductionmentioning

confidence: 99%

Crustal structure of central Lake Baikal: Insights into intracontinental rifting

Brink

Taylor

2002

J. Geophys. Res.

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[1] The Cenozoic rift system of Baikal, located in the interior of the largest continental mass on Earth, is thought to represent a potential analog of the early stage of breakup of supercontinents. We present a detailed P wave velocity structure of the crust and sediments beneath the Central Basin, the deepest basin in the Baikal rift system. The structure is characterized by a Moho depth of 39-42.5 km; an 8-km-thick, laterally continuous high-velocity (7.05-7.4 km/s) lower crust, normal upper mantle velocity (8 km/s), a sedimentary section reaching maximum depths of 9 km, and a gradual increase of sediment velocity with depth. We interpret the high-velocity lower crust to be part of the Siberian Platform that was not thinned or altered significantly during rifting. In comparison to published results from the Siberian Platform, Moho under the basin is elevated by <3 km. On the basis of these results we propose that the basin was formed by upper crustal extension, possibly reactivating structures in an ancient fold-and-thrust belt. The extent and location of upper mantle extension are not revealed by our data, and it may be offset from the rift. We believe that the Baikal rift structure is similar in many respects to the Mesozoic Atlantic rift system, the precursor to the formation of the North Atlantic Ocean. We also propose that the Central Baikal rift evolved by episodic fault propagation and basin enlargement, rather than by two-stage rift evolution as is commonly assumed.

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Terrestrial heat flow of continental rifts

Cited by 32 publications

References 20 publications

Sedimentology and provenance of Mesozoic nonmarine strata in western Mongolia: A record of intracontinental deformation

Sedimentology and provenance of Mesozoic nonmarine strata in western Mongolia: A record of intracontinental deformation

Modeling sub‐sea permafrost in the East Siberian Arctic Shelf: The Laptev Sea region

Crustal structure of central Lake Baikal: Insights into intracontinental rifting

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