Abstract
The Mârmorilik Formation is one of the most important metasedimentary formations in the Precambriah of Greenland. lt is the host rock of the Sorte Engel (Black Angel) zinc-lead ore body, it is the largest potential source of calcitelimestone in West Greenland, and it is a striking marker horizon which greatly facilitates the recognition of major structures in tile Precambtian basement. The formation is composed almostentirely or carbonate rock (dolomite arid calcite marbles); and the original depositional thickness of these rocks has been estimated to be more than 1 km (Henderson & Pulvertaft, 1967) an order of thickness that one of us (A.A.G.) has confirmed during recent detailed mapping south-east of Mârmorilik.
Highlights
Hitchon, B. 1974: Appiication of geochemistry to the search for erude oiland nat~ral gas~ In Lev:i~son, A
It is known that the Marmorilik Formation is at least 1.7 b.y. old, and one of the implications of the regional interpretation of the Umanak area given by Henderson & Pulvertaft (1967) is that the formation may bevery much older than this and perhaps Archaean;since it was regarded in that account as an integral part ofthe basement on which the, presumed Lower Proterozoic, Karrat Group was deposited.' '
With a view to clarifying the all-important question of the age of the Marmorilik Formation, we have carefully examined its contacts with the surrounding rocks in most places where these are accessible, and have collected material for radiometric dating which, we hope, will establish maximum and minimum limits for the time of deposition of the formation
Summary
B. 1974: Appiication of geochemistry to the search for erude oiland nat~ral gas~ In Lev:i~son, A. Age relations of the PrecambrianMårmorilik Marble Formation, central West Greenland It is known that the Marmorilik Formation is at least 1.7 b.y. old, and one of the implications of the regional interpretation of the Umanak area given by Henderson & Pulvertaft (1967) is that the formation may bevery much older than this and perhaps Archaean;since it was regarded in that account as an integral part ofthe basement on which the, presumed Lower Proterozoic, Karrat Group was deposited.' '
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