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Abstract
The lithostratigraphy of the early Tertiary Vaigat Formation on Disko is presented. The formation is divided into six members: Naujanguit Member, Asuk Member, Kûgánguaq Member, Qordlortorssuaq Member, Ordlingassoq Member and Manítdlat Member. The members were formed by two major igneous events. The first event gave rise to the vo!canic rocks from the Naujånguit Member and two minor vo!canic systems enclosed therein: the Asuk and Kiigånguaq Members. The basalts of the Qordlortorssuaq Member constitute the waning phase of the first igneous event. The second igneous event gave rise to the vo!canic rocks of the Ordlingassoq Member within which are enclosed the alkaline basalts of the Manitdlat Member. The members are composed of the folIowing igneous rocks: Naujanguit Member: tholeiitic picrites, minor silicic basalts and olivine-poor tholeiitic basalts; Asuk Member: silicic basalts and magnesian andesites, many rocks carry native iron; Kfigånguaq Member: silicic basalts and magnesian andesites; Qordlortorssuaq Member: olivine-poor tholeiitic basalts; Ordlingassoq Member: tholeiitic picrites, minor alkaline picrites; Manitdlat Member: alkaline picrites and alkaline basalts.
Highlights
The early Tertiary lavas in West Greenland have been divided into three lithostratigraphicai units by Hald & Pedersen (1975)
They comprise from below the Vaigat Formation consisting of lavas and hyaloclastites, mostiy of picritic composition, the Maligåt Formation dominated by feldspar-phyric tholeiitic basalts, and the Hareøen Formation consisting mostiy of olivine-porphyritic transitional basalts
The type area of the Vaigat Formation is the north-east coast of Disko
Summary
The early Tertiary lavas in West Greenland have been divided into three lithostratigraphicai units by Hald & Pedersen (1975). The type area of the Vaigat Formation is the north-east coast of Disko The oldest Naujanguit Member rocks are cross-bedded hyaloclastite and minor pillow lavas which have filled a more than 200 m deep basin which extends below the present sea level
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