Structural and stratigraphic setting of the Ming and other sulphide deposits in the Rambler area, Nfld.

Tuach, John (1975) Structural and stratigraphic setting of the Ming and other sulphide deposits in the Rambler area, Nfld. Masters thesis, Memorial University of Newfoundland.

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Abstract

The lithologies present in the Rambler Area are described, a sequence of lithofacies units is defined, and a simplistic model to explain the evolution of the rocks in the area is proposed. As a generalisation the rocks dip towards the northeast and become younger in that direction. The base of the sequence consists of basic (Komatiitic) lavas, and this is overlain by basic pyroclastic volcanic rocks. Towards the end of the basic pyroclastic stage a centre of acid volcanism developed, and the sulphide deposits can be related to exhalite activity during the waning stages of acid volcanism. The termination of basic pyroclastic volcanism was followed by deposition of a sequence of basic volcanogenic sediment and/or waterlain tuff, and extrusion of local pillow lava units. Abundant basic intrusions may be contemporaneous with the build-up of the volcanic pile. The volcanic sequence was intruded by the Burlington Granodiorite on the west, and Cape Brule Porphyry on the east. -- All the rocks in the area have been subjected to polyphaser deformation and to metamorphism in the upper greenschist facies. The first two deformation involved intense strain with 1<K<00, and large fold structures were recognized relating to the second and third deformation episodes. The shape and orientation of the sulphide deposits have been modified during deformation; and the ore deposits are elongate parallel to F₂ and F₃ fold axes, and to the Z axis of the deformation ellipsoid. -- The Ming ore body is a Cu, Au, Ag bearing sulphide deposit, and occurs at the top of the acid volcanic rock unit in the area. The settings of the other deposits in the area are also considered and it tis concluded that the sulphide deposits are akin to Archean or Kuroko type deposits.

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