Heat flow, structure and evolution of the lithosphere of Mongolia

Khutorskoy, M. D.; Yarmoluk, V.V.

doi:10.1016/0040-1951(89)90024-3

Cited by 33 publications

(18 citation statements)

References 6 publications

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“…The broad north-south trending zone of low Q µ values whose width extends about 1000 km eastward from a longitude just west of the Baikal rift coincides with high heat flow values, while higher Q µ values in western Mongolia coincide with low heat flow (Khutorskoy & Yarmoluk 1989). Q µ values in northeastern China, between Mongolia and the northern Yangtse platform range between ca 60 and 120, a northeast-southwest trending band that roughly coincides with a region of extruded Cenozoic basalts (Menzies & Xu 1998).…”

Section: Discussionmentioning

confidence: 96%

Shear waveQstructure and its lateral variation in the crust of China and surrounding regions

Jemberie

Mitchell

2004

Geophysical Journal International

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S U M M A R YWe have obtained three-layer crustal models of shear wave Q (Q µ ) for several surface wave paths in China and peripheral regions using a single-station, multimode method in which amplitude spectra of fundamental-mode and higher-mode Rayleigh waves, computed for known source depths and mechanisms, are compared to measured spectra. The three layers, totaling 60 km in thickness, roughly comprise the entire crust in the Tibetan plateau and include both the crust and part of the uppermost mantle in other regions where the crust is thinner. Q µ in the shallowest layer, 10 km thick, is lowest (about 40) in the western portion of the Tibetan plateau and highest (about 250) in southeastern China. In the middle layer, at 10-30 km depth, Q µ is lowest (60-80) beneath Tibet and the Pamir thrust system and highest (120-140) in central China and parts of the Sino-Korean platform. Uncertainties of Q µ in the deepest layer, at 30-60 km depth, are much greater than in the upper two layers but available results suggest that Q µ is lowest (about 80) under the Pamir thrust system and highest (about 180) under southern Mongolia. The densities of event and station coverage, although wanting in some regions, allow us to develop the first regionalized maps of crustal Q µ variation for continents. The maps, for depth ranges 0-10 km and 10-30 km, generally show good agreement with Q results obtained earlier with other phases and good correlation with the tectonics of this active region.

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Section: Discussionmentioning

confidence: 96%

Shear waveQstructure and its lateral variation in the crust of China and surrounding regions

Jemberie

Mitchell

2004

Geophysical Journal International

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“…Although this may not necessarily initiate or drive plate fragmentation (Hill 1991), such weakening of the lithosphere may focus or channel extensional stresses through a plate which is being extended by external forces. If the plate is unable to fragment, for example if it is surrounded by divergent or strongly compressional margins, internal plate deformation around the thermally-affected area may occur (for example, the TransbaikaI-Mongolia area which is a region of substantial uplift and neotectonics associated with MioccneRecent volcanism) (Khutorskoy & Yarmoluk 1989). …”

Section: Convectionmentioning

confidence: 99%

Consequences of plume-lithosphere interactions

et al. 1992

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Splitting or thinning of lithosphere above a mantle plume can result in voluminous melt generation, leading to the formation of large igneous provinces, or LIPs. Examples of LIPs include continental flood basalt provinces and oceanic plateaus. Basaltic samples from the Ontong Java Plateau, Nauru Basin and Manihiki Plateau, which are among the largest of the LIPs, have isotopic compositions within the range of ocean island basalts. The majority of continental basalts, however, record a trace element and isotopic contribution from the lithosphere through which they have erupted. We are thus unable to reconcile the available compositional data with models which derive the isotopic and large-ion lithophile element-enriched character of continental flood basalts solely from sub-lithospheric mantle plume sources. A combination of mantle sources is indicated, with the thermal energy being supplied by voluminous melts from a plume, and the lithospheric components in continental flood basalts being inherited by contamination of plume-derived melts by low melting point hydrous and carbonated fractions in the lithosphere. Successive injection of plume-derived melts serves to heat the lithosphere, reducing its viscosity and making it susceptible to rupture if allowed by regional plate forces. Furthermore, the lithosphere, including the mechanical boundary layer, may be thinned by thermal stripping from below, allowing the plume mantle to ascend and decompress further. Such a system has the potential for positive feedback leading to rapid melt generation. While we do not exclude recent models of LIP formation which require the sudden impact of a new mantle plume, we favour a model whereby the thermal anomaly builds gradually, incubating beneath a steady-state lithospheric cap.

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“…The cross sections of mantle convective flow and temperature deviation across the Hangay Dome. that all the geologic tectonics in central Asia are due to the NE-SW compression associated with the India-Eurasia collision (Zorin and Florensov, 1979) and the values of the observed heat flow are up to 40-70 mW m À2 on the earth's surface (Khutorskoy and Yarmoluk, 1989). In addition, our results indicate that an upwelling occurs below the Hangay Dome, especially the southwestern Hangay Dome (Figs.…”

Section: Hangay Domementioning

confidence: 81%

Tomography-based mantle flow beneath Mongolia-Baikal area

Zhu

2014

Physics of the Earth and Planetary Interiors

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Heat flow, structure and evolution of the lithosphere of Mongolia

Cited by 33 publications

References 6 publications

Shear waveQstructure and its lateral variation in the crust of China and surrounding regions

Shear waveQstructure and its lateral variation in the crust of China and surrounding regions

Consequences of plume-lithosphere interactions

Tomography-based mantle flow beneath Mongolia-Baikal area

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