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Geology of the Haggart Creek-Dublin Gulch Area, Mayo district, Yukon Territory. Tempelman-Kluit, Dirk Jacob

Abstract

The map area is a four miles by ten miles strip that extends westward from the summit of Potato Hills. The centre of the map area lies about thirty miles north of Mayo, Y.T. Exposure is poor in many parts of the area, because of the thick Pleistocene cover. The rocks in the area are quartzites of the precambrian Yukon Group. Quartzite is generally micaceous and contains interbedded phyllite. Regional metamorphism (greenschist facies) has affected these rocks. An early bedding plane foliation has been modified by two distinct phases of folding. A granodiorite stock with related sills of similar composition has intruded the metamorphic assemblage and a five hundred feet wide thermal metamorphic aureole that contains corundum has been developed in the metasedimentary rocks around the stock. East trending and later north trending faults have disrupted the rocks. Mineralization in the area is of various types. Silver-lead-antimony veins occur in the west. A preliminary study of their mineralogy shows them to contain jamesonite, galena, sphalerite, chalcopyrite, pyrite, arsenopyrite, tetrahedrite and boulangerite in a gangue of siderite and dolomite. Secondary minerals include bindheimite or stetefeldite, anglesite, goethite, scorodite, covellite and chalcosite. Two stages of Pleistocene ice advance have modified the topography.

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