Results 171 to 180 of about 318,975 (205)
Some of the next articles are maybe not open access.
Chapter 7 Karelian supracrustal rocks
2005Publisher Summary The most hampering thing is the lack of continuous vertical stratigraphic sections and the small size of the outcrops. The result is that unconformities and their correlative surfaces, which are essential in sequence stratigraphy, can be observed in a few places only.
openaire +1 more source
Rb–Sr Ages of Early Archaean Supracrustal Rocks and Amîtsoq Gneisses at Isua
Nature, 1977PREVIOUS field descriptions1–4 and isotopic age determinations5,6 left unresolved several important points about the relationships between the Isua supracrustal rocks and the surrounding Amitsoq gneisses. In scattered areas of comparatively low deformation, field relationships show unequivocally that gneissose granitic veins intrude the supracrustal ...
S Moorbath, D Bridgwater
exaly +2 more sources
Geology, Age and Origin of Supracrustal Rocks at Akilia, West Greenland
American Journal of Science, 2006New mapping, geochronology, and geochemistry of the supracrustal enclave and associated orthogneisses at Akilia, West Greenland, support a ≥3825 ± 6 Ma age for the sequence and a chemical sedimentary origin for the controversial Fe-rich quartz-pyroxene gneisses.
openaire +1 more source
Upper proterozoic supracrustal rocks of North America: A brief review
Precambrian Research, 1981Abstract Well-preserved successions of supracrustal rocks of Upper Proterozoic age are present around the margins of North America but are rare in the continental interior. The thickest and most complete assemblage is present in the Cordilleran region, particularly in the central and northern parts.
openaire +1 more source
Metamorphism of the supracrustal rocks in the Thompson Belt, Manitoba
1984Regional deformation and amphibolite facies metamorphism affected supracrustal rocks of the Thompson Belt in north-central Manitoba. The metamorphic conditions of two metasedimentary rock sequences were studied and correlate with those observed by Peredery (1982).
openaire +1 more source
The Precambrian Supracrustal Rocks of Nunataq, North-East Disko Bugt, West Greenland
Geological Survey of Denmark and Greenland Bulletin, 1999 Supracrustal rocks preserved in a major syncline in southern Nunataq comprise an Archaean and a Proterozoic sequence. An angular discordance between the two sequences is preserved locally. The basal development of the younger sequence shows similarities with that of the lower Proterozoic Mârmorilik Formation of the Uummannaq region north of Nuussuaq ...
A.K. Higgins, N.J. Soper
exaly +2 more sources
Structural Studies in the Archaean Sargur and Dharwar Supracrustal Rocks of the Karnataka Craton
Journal Geological Society of India, 1978Abstract Structural studies in the linear supracrustal belts and adjacent Peninsular Gneiss in the areas of Sargur, Holenarsipur and Chitradurga have revealed Land S tectonites and related structures, which are attributed to phases of deformation SgDl, SgD2 and SgD3 in the older Sargur Group and DhDI, DhD2 and DhD3 in the younger Dharwar
Brian Chadwick +3 more
openaire +1 more source
Structural Pattern in Sukma Supracrustal Rocks Near Nagaras, Southern Bastar Craton
Journal of the Geological Society of India, 2006Abstract The Precambrian Sukma supracrustal sequence near Nagaras, southern Bastar Craton, has been mapped as two quartzite lithounits and an intervening undifferentiated unit comprising Mg-Al rich granulite, mafic granulite, amphibolite and hornblende schist The rocks bear imprints of three phases of deformation The structures of the
THAKUR, SS, PATEL, SC, DASGUPTA, S
openaire +1 more source
Homogenous deformation in precambrian supracrustal rocks of Kumlinge area, southwest Finland
Precambrian Research, 1976Abstract Supracrustal rocks form a trough-like prolonged syncline surrounded by granitic rocks. They consist of quartz-feldspar schists (leptites) overlain by amphibolites. The stratigraphic succession in the syncline is as follows: undermost lie leptites followed by amphibolitic pillow lavas, which are gradually superseded by pillow breccias and ...
openaire +1 more source
Gondwana Research, 2014
Abstract We report detrital zircon ages for Precambrian and early Palaeozoic metasediments from the Tianshan orogen in Kyrgyzstan, an important component of the Central Asian Orogenic Belt and compare these with published ages from the Chinese Tianshan and the Tarim craton.
Y. Rojas-Agramonte +12 more
openaire +1 more source
Abstract We report detrital zircon ages for Precambrian and early Palaeozoic metasediments from the Tianshan orogen in Kyrgyzstan, an important component of the Central Asian Orogenic Belt and compare these with published ages from the Chinese Tianshan and the Tarim craton.
Y. Rojas-Agramonte +12 more
openaire +1 more source