Establishment of isostatic equilibrium in Earth's crust

Artyushkov, Ye. V.

doi:10.1080/00206816709476060

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…This latter factor alone makes it-inadvisable to as a basis for modeling dynamics of the upper mantle by estimate viscosities on the basis of simple parameters of Turcotte and' Oxburgh [1967], Magnitsky [1967], Mc-flexure such as amplitude and characteristic length, which Kenzie [1967b], and Oxburgh and Turcotte [1968_]. Vis-are used by Artyushkov [1967Artyushkov [ , 1971 and Walcott [1970a, cosity by this mechanism is pressure-and temperature-b] to make estimates of lithosphere-asthenosphere models dependent [Herring, 1950'] distribution of deforming load need not be known. Such a model is not directly equivalent to the tectonic case, however, which entails the following considerations.…”

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confidence: 99%

Upper mantle rheology in a tectonic region: Evidence from New Guinea

Chappell¹

1974

J. Geophys. Res.

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Deformed coral terraces on the coast of northeast New Guinea provide an opportunity for estimating lithosphere‐asthenosphere rheology in a tectonic region. The terraces can be traced for about 130 km and can be extrapolated to a point of convergence about 55 km beyond the zone of least rapid uplift. On the basis of different assumptions about changes of tectonic forces through time, least squares estimates are made of relaxation spectra. These estimates are compared with spectra for layered earth models, calculated on a basis similar to the basis used by McConnell (1968) for Fennoscandia. A zone of low viscosity (∼2 × 1021 stokes) appears to exist between 80 and 220 km, at which point viscosity appears to rise to 1022. There is a contrast with Fennoscandia, where viscosity appears to remain around 3 × 1021 down to 400 km: the difference may be attributable to lowered geotherms beneath northern New Guinea resulting from subduction.

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confidence: 99%

Upper mantle rheology in a tectonic region: Evidence from New Guinea

Chappell¹

1974

J. Geophys. Res.

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“…Therefore, we can only assume the possible (perhaps even probable) existence of extremely deep magmas. Ultimately it is not impossible that their formation may be due even to processes occurring at the boundary between the mantle and the core (1). If such ultra-deep magmas do, in fact, exist, it would follow that their formation and ascent are most likely due to active, extremely deep zones over which geosynclines are formed on the earth's surface.…”

Section: Statement and Scope Of The Problemmentioning

confidence: 98%

The problem of the deep sources of magmas

Sheynmann¹

1970

International Geology Review

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“…Postglacial uplifts have been studied by many authors and described in numerous publications. Most geologists and geophysicists conclude, from a combination of independent indications, that postglacial uplifts are caused by the isostatic mechanism (Artyushkov 1967). Geologic and geomorphologic evidence in the areas covered by glacial sluelds or recently free from ice are detailed and reliable enough.…”

Section: Introductionmentioning

confidence: 99%

On the problem of the mechanism of postglacial rises

Sigalov

1980

Geophys J Int

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In this paper one of the possible mechanisms for postglacial uplift is considered. It is based on the known fact of the phase boundary reaction to change in pressure in the medium. Unlike the mathematical model for such mechanisms considered previously in a number of publications, we propose a model that takes into account the supercooling (superheating) on the crystallization (melting) front responsible for a phase transition. The algorithm for a numerical solution to the mathematical model is derived. The solution leads to the following conclusions:1. Geological data on postglacial uplift are accounted for if the following conditions are observed. (a) There is one phase boundary in the layer subjected to a phase transition. If the layer is bounded by phase boundaries on two sides its thickness should be no less than 200 km. (b) The transition temperature curve and that of the temperature of the medium are close to each other. (c) The latent heat is close to 10 cal g-'. (d) Properties of the mantle rocks are such that the parameter characterizing overheating in the phase transition should satisfy a certain condition.2. In view of strict limitations set by this work on the phase mechanism, the latter is less probable in a real medium than the mechanism related to viscosity of the mantle.

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Establishment of isostatic equilibrium in Earth's crust

Cited by 4 publications

References 4 publications

Upper mantle rheology in a tectonic region: Evidence from New Guinea

Upper mantle rheology in a tectonic region: Evidence from New Guinea

The problem of the deep sources of magmas

On the problem of the mechanism of postglacial rises

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