The Perturbation of Alternating Geomagnetic Fields by an Island near a Coastline: Discussion

TLDR: Papezik et al. as mentioned in this paper suggested that the Cambrian sediments were derived mainly from Hadrynian rocks on the Avalon Peninsula and beneath the continental shelf, and thus could be the source of the 'exotic' detrital minerals in the lower Paleozoic strata.

Abstract: tonic belts in eastern Newfoundland like those described by McCartney ( 1967 ) and reinterpreted by Hughes and Briickner ( 1971 ) ; (b) an undetected plutonic-metamorphic terrane to the northeast of the Avalon Peninsula now beneath the continental shelf, as supported by Papezik (1972) ; and (c) locally on the west, the plutonic-metamorphic rocks of the eastern crystalline belt of Jenness (1963), and Kennedy and McGonigal (1972). I suspect that the Cambrian sediments were derived mainly from Hadrynian rocks on the Avalon Peninsula and beneath the continental shelf. During the late Early Ordovician the undetected plutonicmetamorphic terrane became uplifted and sup plied quartz-rich sand and silt rich in detrital muscovite to a depressed platform upon which 5000 feet of strata accumulated (Rose 1952). The plutonic-metamorphic terrane, or more likely the older part of it in the eastern crystalline belt, may indeed extend eastward beneath the Avalon Peninsula and continental shelf as proposed by Papezik and thus be the source of the 'exotic' detrital minerals in the Hadrynian and lower Paleozoic strata. The age of this crystalline terrane supposedly beneath the continental shelf is unknown beyond being prelatest Precambrian; the 540-m.y. K-Ar date (Wanless et al. 1972) on detrital musco