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Título: A study of Archean sediments of the Canadian Shield.
Autores: Black, Philip Thomas.
Fecha: 1949
Publicador: McGill University - MCGILL
Fuente:
Tipo: Electronic Thesis or Dissertation
Tema: Geological Sciences.
Descripción: This thesis is based on the literature of Dominion and Provincial Surveys of Canada and other pertinent sources. In scope, this investigation does not include the Grenville Sub-province because of its indecisive geological relationship to the remainder of the Shield. Archean rocks are classed as such because; 1. they consist largely of vo1canics and illsorted sediments and when in contact with the less deformed (Algonkian Type) rocks are bound to underlie them unconformably. 2. the sediments approximate lithologically the younger Algonkian group, but are more strongly deformed. The purpose of this research is to render a summary of what is now known about the kinds and relative quantity of sediments comprising this ancient enigmatic rock assemblage. Time did not permit a more exhaustive examination of all reports published on these rocks; however, the writer believes the list of references of Appendix “A” (page 49) to be representative of that literature containing the better type of descriptive information. Thus, they are the basis of this thesis. It is hoped that paths of research as suggested subsequently will be of contributory value to our knowledge of the Archean. Rocks mapped as Archean today are merely the upended remnants of them. Erosion and peneplanation have exposed such deeply buried rocks that they are shown as usually isolated 3 linear belts in a huge composite mass of crystalline granitic rocks.[...]
Idioma: en