Results 191 to 200 of about 43,824 (242)
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1975
The African continent (Fig. 6.1) has as its basement a huge platform of crystalline rocks partially masked by flat lying cover-successions of many ages. Towards the eastern, northern and western coasts, the crystalline complexes descend in many places beneath successions of Mesozoic and Tertiary sediments deposited in marginal marine basins.
H. H. Read, Janet Watson
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The African continent (Fig. 6.1) has as its basement a huge platform of crystalline rocks partially masked by flat lying cover-successions of many ages. Towards the eastern, northern and western coasts, the crystalline complexes descend in many places beneath successions of Mesozoic and Tertiary sediments deposited in marginal marine basins.
H. H. Read, Janet Watson
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Cratonic Lithosphere Delamination and Relamination Explain the Temporal Variation of Cratons
2023Cratonic lithosphere delamination has been frequently suggested in recent studies. However, the fate of the delaminated Sub-Cratonic Lithospheric Mantle (SCLM) has not been thoroughly investigated. Here, we use 2D numerical models to study the evolution of initially delaminated SCLM whose density is initially larger than that of the ambient mantle. Our
Lihang Peng, Lijun Liu, Liang Liu
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1975
From a geological standpoint, the Indian subcontinent can be separated into two contrasting regions. To the south, bounded by fracture-coastlines, lies the triangular cratonic region of Peninsular India and Ceylon which has remained stable since early Palaeozoic times.
H. H. Read, Janet Watson
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From a geological standpoint, the Indian subcontinent can be separated into two contrasting regions. To the south, bounded by fracture-coastlines, lies the triangular cratonic region of Peninsular India and Ceylon which has remained stable since early Palaeozoic times.
H. H. Read, Janet Watson
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Density heterogeneity of the cratonic lithosphere: A case study of the Siberian Craton
Gondwana Research, 2015Using free-board modeling, we examine a vertically-averaged mantle density beneath the Archean–Proterozoic Siberian Craton in the layer from the Moho down to base of the chemical boundary layer (CBL). Two models are tested: in Model 1 the base of the CBL coincides with the LAB, whereas in Model 2 the base of the CBL is at a 180 km depth.
Cherepanova, Yulia, Artemieva, Irina
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1975
The continental mass of Australia (Fig. 8.1) is made up of four great structural units, to which we may add a fifth represented in the fringing island arcs to the north and east. The oldest and most extensive unit is the Precambrian craton which comprises most of the central and western parts of the continent where Precambrian rocks are exposed beneath
H. H. Read, Janet Watson
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The continental mass of Australia (Fig. 8.1) is made up of four great structural units, to which we may add a fifth represented in the fringing island arcs to the north and east. The oldest and most extensive unit is the Precambrian craton which comprises most of the central and western parts of the continent where Precambrian rocks are exposed beneath
H. H. Read, Janet Watson
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Lithos, 1995
“Lower-crustal suite” xenoliths occur in “on-craton” and “off-craton” kimberlites located across the south-western margin of the Kaapvaal craton, southern Africa. Rock types include mafic granulite (plagioclase-bearing assemblages), eclogite (plagioclase-absent assemblages with omphacitic clinopyroxene) and garnet pyroxenite (“orthopyroxene-bearing ...
N.J. Pearson +2 more
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“Lower-crustal suite” xenoliths occur in “on-craton” and “off-craton” kimberlites located across the south-western margin of the Kaapvaal craton, southern Africa. Rock types include mafic granulite (plagioclase-bearing assemblages), eclogite (plagioclase-absent assemblages with omphacitic clinopyroxene) and garnet pyroxenite (“orthopyroxene-bearing ...
N.J. Pearson +2 more
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Thermal regime of the North China Craton: Implications for craton destruction
Earth-Science Reviews, 2015Abstract This paper presents an overview of the thermal studies dealing with heat flow data, lithospheric thermal thickness, basin thermal history, and thermal modeling in the North China Craton (NCC), with aim to provide ideas for geodynamical mechanism on the NCC destruction.
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Granite Landforms of the Indian Cratons
2014The granite landforms of peninsular India, particularly in the semi-arid continental interior, form rugged clusters of oddly shaped bedrock monoliths and boulders corresponding to stripped weathering fronts. By no means unique to India, the array of landforms typical of most tropical landscapes and commonly described in geomorphology textbooks is ...
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Proceedings of the Indian National Science Academy, 2020
Anuj Kumar Singh, Jayanta Kumar Pati
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Anuj Kumar Singh, Jayanta Kumar Pati
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