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2 edition of Isotopic age determinations from South Greenland and their geological setting. found in the catalog.

Isotopic age determinations from South Greenland and their geological setting.

David Bridgwater

Isotopic age determinations from South Greenland and their geological setting.

by David Bridgwater

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Published by Bianco Lunos Bogtrykkeri in K©ıbenhavn .
Written in English


Edition Notes

Reprinted from "Meddelelser om Gr©ınland", Bd.179, Nr.4.

SeriesBulletin / Gr©ınlands geologiske unders©ıgelse -- No.53
ID Numbers
Open LibraryOL13773515M

(). Rb-Sr age determinations on shales associated with the Varanger Ice Age. (). Rb-Sr and K-Ar geochronometry of Mesozoic granitic rocks and their Sr isotopic composition, (). Rb-Sr whole-rock chronology of Caledonian events in northeast : Christopher David Longman. (). Age and origin of early Proterozoic dolerite dykes in South-West Greenland. Contributions to Mineralogy and Petrology, (). Age determinations and geological studies, K-Ar isotopic Author: Andrew Christopher. Cadman.

Not that the sodalite group has recently been considered as part of the (No. 15). Geological Society of Australia, Special Publications, McDougall, I., & Leggo, P. J. (). Isotopic age determinations on granitic rocks from Tasmania. Journal of the Geological Society of Australia, 12(2), South y of. The determinations were made by X-ray fluorescence, using the Bridgwater, D. Isotopic age determinations from South Greenland and their geological setting. Bull. Grønlands geol. Unders. 53 (also Meddr Grønland , 4), 56 pp. Download Limit Exceeded.

Isotope geochemistry is an aspect of geology based upon the study of natural variations in the relative abundances of isotopes of various elements. Variations in isotopic abundance are measured by isotope ratio mass spectrometry, and can reveal information about the ages and origins of rock, air or water bodies, or processes of mixing between them. Greenland is the largest island on one-fifth of its surface area is exposed bedrock, the rest being covered by exposed surface is approximately , km The geology of Greenland is dominated by crystalline rocks of the Precambrian Shield. The crystalline rocks of the Nuuk/Qeqertarsuatsiaat area comprise some of the oldest bedrock in Greenland which covers most of.


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Isotopic age determinations from South Greenland and their geological setting by David Bridgwater Download PDF EPUB FB2

Get this from a library. Isotopic age determinations from South Greenland and their geological setting. [David Bridgwater; Grønlands geologiske undersøgelse.]. A Rb Sr whole-rock isochron gives an age of ±21 m.y.

for the agpaitic units of Ilímaussaq, showing that this complex belongs to the main phase of Gardar igneous activity in south Greenland and is not, as previously supposed, a significantly younger by: Paleomagnetic results and isotopic age determinations for granophyre and rhyolite from small, isolated nunataks in southern Coats Land, Antarctica, are used to evaluate late Proterozoic plate reconstructions.

U-Pb zircon dates for the two rock types indicate coeval crystallization at ±4 Ma. Bridgewater D. Isotopic age determinations from South Greenland and their geological setting.

Bull. Groenl. geol. Unders. 53, The Blind River uranium deposits: the ores and their setting. Misc. Pap. Sassano G. Fritz P.

and Morton R. Paragenesis and isotopic composition of some gangue minerals from the uranium deposits of Cited by: 3. Geology and setting of the Ivigtut Granite 61 Precambrian Gardar Province of south Greenland indicate that the mag-in their general review of Gardar geology, have listed some 10 major complexes) and, in addition, a wide variety of dykes and lava flows.

Rock compositions range from gabbros and nepheline-rich syen. This flat tabular format is from Breitsprecher, K. and Mortensen, J.K., BCAge A - a database of isotopic age determinations for rock units from British Columbia. British Columbia Ministry of Energy and Mines, Geological Survey, Open File (Release ).

Additional Information. ON THE AGE OF THE ILlMAUSSAQ AND IGALIKO INTRUSIONS IN THE GARDAR Complete lists of recent isotopic age determinations on minerals and Bridgwater, D. Isotopic age determinations from Southern Greenland and their geological setting.

Meddr Grønland (4), 56 pp. Introduction. Wegmann () adopted the term ‘Gardar Formation’ from the old Norse bishopric of Gardar in south Greenland, as the name for the distinctive association of essentially unmetamorphosed and undeformed alkaline intrusive rocks and successions of clastic sediments and subaerial lavas which are beautifully exposed in the area.

Earlier reviews of the province have been Cited by: The composition of sands from the Fiskenæsset region, South-West Greenland, and its bearing on the bedrock geology of the area.

Greenland Geol. Surv. Report 40 () Google Scholar Lambert, J., Holland, J.G.: Amîtsoq gneiss geochemistry: preliminary by: Terms in this set (10) Before the development of isotopic dating methods, scientists estimated the age of the earth by (all of the possible answers are correct) counting generations in the bible, comparing rates of change on Earth's surface today with the geologic record, calculating the cooling history of the Earth, estimating evolution rates.

Magmatism of the mid-Proterozoic Gardar Province, South Greenland: Chronology, petrogenesis and geological setting. May ; Lithos 68(1) age determinations have demonstrated at least two.

The Gardar Province in South Greenland is a rift-related igneous province with magmatism lasting from about to Ga (Emeleus and Upton, ; Upton and Emeleus, ; Uptonetal., ). It comprises about 12 main igneous complexes, numerous dykes of variable chemical composition, and a sequence of rift-related interlayered lavas and.

II Allaart, J. H.: Review of the work on the Precambrian basement (pre-Gardar) between Kobberminebugt and Frederiksdal, South Greenland. - Grønlands. GEOLOGY, March Carboniferous age for the East Greenland “Devonian”basin: Paleomagnetic and isotopic constraints on age, stratigraphy, and plate reconstructions: Comment and Reply Figure 1.

Devonian-Carboniferous stratigraphy of East old names of Bütler () preferred by Hartz et al. () for the Devo. Grundvigskirken – a needle-like mountain peak of hard, Caledonian cristalline rocks (granite, gneiss) in the Øfjord, shaped by ice-age glaciers B) The Scoresbysund-area in East Greenland The Scoresbysund area has a long and varied Earth history, which spans almost 3 billion years.

Archean and Proterozoic crust in North-West Greenland: evidence from Rb–Sr whole-rock age determinations February Canadian Journal of Earth Sciences 25(9) All RSIL Publications: This site is not up to date.

For recent publications, see the links below: Geological Survey Program on the South Florida Ecosystem-Proceedings of the technical symposium in Ft. Lauderdale, Florida, AugustU.S. Geological Survey Open-File Report,p. E., and Coplen, T.B.,Methods for. Study of the Precambrian basement of the East Greenland Caledonides has revealed evidence for Archean, Paleoproterozoic, and Grenvillian orogenic events prior to the formation of the present Caledonian orogen (e.g., Steiger et al., ).Archean rocks, mainly orthogneisses, are best preserved in the southernmost part of the orogen, south of ∼72°50′N; further north, most of the crystalline.

Geological Survey of Canada Paper (Part I) Age Determinations and Geological Studies Part I - Isotopic Ages, Report 5 [Wanless, R.K. et al.] on *FREE* shipping on qualifying offers.

Geological Survey of Canada Paper (Part I) Age Determinations and Geological Studies Part I - Isotopic. Assessment of lithological, geochemical and structural controls on gold distribution in the Nalunaq gold deposit, South Greenland using three-dimensional implicit modelling.

Geological Society, London, Special Publications, Vol.Issue. 1, p. The wealth of new observations and data accumulated between and during regional mapping by the Geological Survey of Greenland and other organizations has radically changed our understanding of virtually all aspects of the East Greenland segment of the orogen extends for km between 70°N (Scoresby Sund) and 82°N (Kronprins Christian Land).The East Greenland “Devonian” basin formed as an intramontane supradetachment basin (Hartz and Andresen, ) within the Caledonian oro-gen (Bütler,; Haller,).

Devonian depos-its generally are in large north-south–trending grabens, most recently suggested to be controlled by major left-lateral faults (Larsen and Bengaard, ).

Geological setting and sample selection. The Gardar province in SW-Greenland (Fig. 1) is a failed Mesoproterozoic continental rift that was volcanically and tectonically active in two cycles 37 Cited by: 2.