Zobrazeno 1 - 10
of 36
pro vyhledávání: '"R.C.O. Gill"'
Publikováno v:
Chemical Geology. 133:225-240
New SmNd isotopic results for sixteen samples from the Garbenschiefer Amphibolite Unit of the > 3700-Ma Isua supracrustal belt of West Greenland are reported. The data illustrate the difficulty in identifying primary ϵNd(T) values in poly-metamor
Publikováno v:
University of Copenhagen
The Tertiary volcanism of the North Atlantic region provides one of the most extensive and best described magmatic records of interaction between a starting plume and continental lithosphere, and the role of plumes in continental break-up. Many autho
Publikováno v:
Geological Society, London, Special Publications. 68:335-348
Publikováno v:
Rapport Grønlands Geologiske Undersøgelse. 85:74-83
The 1976 season's work was the first of a reconnaissance mapping programme between 62° 30'N (Tingmiarmiut) and 68° 00'N (Kangerdlugssuaq) as the first stage in producing 1:500000 map sheets of this part ofthe east coast. The work was carried out by
Autor:
D. Bridgwater, R.C.O. Gill
Publikováno v:
Earth and Planetary Science Letters. 29:276-282
The pre-3100 m.y. old Ameralik dykes from West Greenland show a range in primary composition from primitive low-K, low-Ti tholeiites virtually identical in composition to ridge basalts of modern ocean crust, to more differentiated basaltic rocks simi
Publikováno v:
Rapport Grønlands Geologiske Undersøgelse. 95:82-85
Work was carried out from the 80 ton cutter Tycho Brahe using 16 ft inflatable rubber dinghies between 24th July and 31st August 1978. In addition, the Nagssugtoqidian boundary was mapped westwards from Kangerdlugssuatsiaq to the inland ice cap by Be
Publikováno v:
Rapport Grønlands Geologiske Undersøgelse. 100:86-90
A light aircraft and helicopter were used between the 23rd and 29th July to complete the mapping of the 1:500000 geological map sheet 13 (fig. 2). Two reconnaissance flights were made from Iceland in a Piper Navajo aircraft on the 23rd and 24th July
Publikováno v:
Chemical Geology. 16:129-135
Gold concentrations have been determined by neutron activation in sixteen samples of komatiites and related rocks from Barberton, South Africa. All the rocks give Au values in the ranges 1–1.5 ppb with no evidence for anomalously high values in suc
Publikováno v:
Rapport Grønlands Geologiske Undersøgelse. 83:1-17
The preliminary results of a reconnaissance survey of the coast between Kangerdlugssuaq and Angmagssalik are summarized. The Archaean gneiss complex between Kangerdlugssuaq and Kap Japetus Steenstrup is fairly uniform and comprises granitoid gneisses
Autor:
J.G. Fitton, R.C.O. Gill
Publikováno v:
Geochimica et Cosmochimica Acta. 34:518-524
Experiments are described which demonstrate considerable atmospheric oxidation of ferrous iron in hydrous igneous rocks during routine grinding in a disc mill prior to chemical analysis. The causes and implications of this oxidation are discussed.