Zobrazeno 1 - 10
of 49
pro vyhledávání: '"G. L. Cumming"'
Publikováno v:
The Crust and Upper Mantle of the Pacific Area
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::34af3a1eb6f7c8d84513ee549d7a4607
https://doi.org/10.1029/gm012p0441
https://doi.org/10.1029/gm012p0441
Publikováno v:
Canadian Journal of Earth Sciences. 32:1221-1235
Samples from the Porphyry deposit and the Shoot zone prospect of St. Andrew Goldfields Ltd. in Taylor Township near Matheson, Ontario, have been dated by several different techniques and utilized as a test of the use of Pb-isotope measurements in det
Publikováno v:
Canadian Journal of Earth Sciences. 32:508-515
Pb, Sr, and Nd isotopic analyses were performed on a suite of compositionally variable rock samples representing an approximately 2500 m thickness of oceanic crustal lithologies from the deep rift valleys and spreading centers along the periphery of
The age of unconformity-related uranium mineralization in the Athabasca Basin, northern Saskatchewan
Autor:
G. L. Cumming, D. Krstic
Publikováno v:
Canadian Journal of Earth Sciences. 29:1623-1639
Age data are presented for major Athabasca Basin uranium deposits at Cigar Lake, Cluff Lake, Collins Bay, Dawn Lake, Eagle Point, McArthur River, Midwest, and Rabbit Lake, as well as for several minor or undeveloped deposits, including Hughes Lake an
Autor:
D. Krstic, G. L. Cumming
Publikováno v:
Canadian Journal of Earth Sciences. 28:1328-1339
Pb-isotope ratios of whole-rock specimens and mineral separates from the gneisses surrounding the Namew Lake Ni–Cu deposit, south of Flin Flon, Manitoba, are compared with the Pb-isotope ratios in the ore minerals and with recently reported zircon
Publikováno v:
Economic Geology. 86:944-959
Lead isotope compositions are reported here for auriferous quartz veins of Nicaragua and for some of their possible source rocks. The veins are hosted by a belt of Cenozoic continental margin basalts and basaltic andesites, which were formed as a res
Autor:
D. Krstic, G. L. Cumming
Publikováno v:
Canadian Journal of Earth Sciences. 28:309-325
Intermediate composition orthogneisses of the southward extension of the Flin Flon greenstone belt surround the ultramafic host rock of the Namew Lake Ni–Cu deposit in northern Manitoba. The gneisses began cooling from elevated temperatures of appr
Publikováno v:
Applied Geochemistry. 8:71-73
Non-autochthonous Pb in soil profiles has been identified by its characteristic isotope patterns, and the degree of mobility of the Pb contamination can be estimated using these isotope patterns.
Publikováno v:
Contributions to Mineralogy and Petrology. 97:19-30
Lead isotope data on whole rocks, feldspars and sulfides from the Ivrea zone indicate that the magmas which formed the Hercynian (?) mafic complex derived from an isotopically anomalous mantle with a lead isotope composition that resembled average co