Explanatory notes to the Geological map of Greenland, 1:500 000, Humboldt Gletscher, Sheet 6

Abstract

Dawes, P.R. 2004: Explanatory notes to the Geological map of Greenland, 1:500 000, Humboldt Gletscher, Sheet 6. Geological Survey of Denmark and Greenland Map Series 1, 48 pp. + map.
 These explanatory notes cover the map region bounded by latitudes 78°N and 81°N and longitudes 56°W and 74°W, with geology shown on the land areas between Nares Strait - the seaway between Greenland and Ellesmere Island, Canada - and the Inland Ice. The bedrock geology is composed of Precambrian and Lower Palaeozoic provinces that continue across Nares Strait into Canada. Map units and mineral occurrences are described in general terms and are proceeded by sections on physical environment, logistics, data sources and geoscientific research. The notes are aimed at the practical user and a guide for further reading.The bedrock is composed of three provinces separated by unconformities, each representing a hiatus of c. 500 Ma during which basic dykes were emplaced. The Palaeoproterozoic Inglefield mobile belt, forming the crystalline shield, is an E-W-trending belt of deposition and orogeny characterised by polyphase magmatism, deformation and high-grade metamorphism. Clastic deposition, with magmatism at c. 1985 Ma, are the oldest events recorded, followed by the accumulation of the Etah Group (carbonate, pelitic and psammitic sediments with supposedly coeval mafic and ultramafic rocks) between 1980 and 1950 Ma ago. These rocks were intruded 1950 to 1915 Ma ago by the Etah meta-igneous complex, that records polyphase plutonism (intermediate to felsic, with some basic and magnetite-rich rocks), followed by deformation and partial melting producing granites 1785 to 1740 Ma ago. The Mesoproterozoic Thule Basin, defined by the unmetamorphosed and little deformed Thule Supergroup, records sedimentation and basaltic volcanism at least as old as 1270 Ma. The faulted, north-eastern basin margin shown on the map preserves the passage from the basinal sequence to a relatively thin platform succession invaded by basic sills. The Palaeozoic Franklinian Basin is represented by a homoclinal Cambrian to Silurian shelf carbonate succession and a major Silurian reef complex, with coeval siliciclastic slope deposits. The map region includes the classical area for Franklinian stratigraphy, now composed of 29 formations and four groups - Ryder Gletscher, Morris Bugt, Washington Land and Peary Land Groups.The only younger units preserved in the map region are widespread Quaternary deposits, an isolated outcrop of coarse-grained fluvial deposits (Bjørnehiet Formation) and non-carbonised wood erratics of Neogene age.Five mineral occurrence types are shown on the map: in lithologies of the Inglefield mobile belt, sulphide-graphite rust zones, a magnetite deposit and copper-gold mineralisation and in the Franklinian Basin, commercially drilled, zinc-lead-silver and zinc-lead-barium mineralisations. The basic ingredients of a petroleum model exist in the Franklinian Basin but prospectivity is low.

⁴⁰AR/³⁹AR geochronology of biotite from ductile shear zones of the Ellesmere-Devon crystalline terrane, Nunavut, Canadian Arctic

“…The gneissosity is moderately well developed in the paragneisses, but can be quite weak in the more massive intrusive rocks. The N-S gneissosity on southeast Ellesmere Island is at a high angle to the E-W gneissosity on Devon Island (Frisch, 1984(Frisch, , 1988 and North-West Greenland (Dawes and Garde, 2004;Nutman et al, 2008). In contrast to the study area, ductile shear zones up to 30 m thick have been observed on Devon Island (Frisch, 1988).…”

Glacial sedimentation, fluxes and erosion rates associated with ice retreat in Petermann Fjord and Nares Strait, north-west Greenland

“…The Wegener Transform Fault, crossing from Judge Daly Promontory to Kap Lupton (Fig. 2) in the study area and extending northwards in Nares Strait (Dawes, 2004; Tessen- ; JDP is Judge Daly Promontory. Ice flow in marine areas (black arrows) and deglacial ice-sheet margins for the early Holocene (9.3, ∼ 8.7 and ∼ 7.6 ka cal BP) are also shown for Nares Strait and were compiled from England (1999), Georgiadis et al (2018) and Jakobsson et al (2018).…”

Explanatory notes to the Geological map of Greenland, 1:500 000, Thule, Sheet 5

“…Also, the inaccessible Lauge Koch Kyst has only been mapped in reconnaissance style (see under Melville Bugt orthogneiss and Lauge Koch Kyst supracrustal complexes). Concentration on coastal areas focussed attention on the Thule Basin that was mapped in its entirety at formational level and followed north onto the adjoining map sheet where the basin margin facies is exposed (Dawes & Garde 2004).…”

“…Thule mixed-gneiss complex and Prudhoe Land supracrustal complex (see Relationships of the complexes, sections 7, 8) Distribution, composition and metamorphism. The Prudhoe Land granulite complex stretches beyond the map region to north of Sonntag Bugt where it is lost beneath the Inland Ice (Dawes & Garde 2004). The term 'granulite' is used in a metamorphic and lithological sense.…”

“…1). The map sheet is bordered on the south by Upernavik Isfjord, Sheet 4 (Escher 1985a) and on the north by Humboldt Gletscher, Sheet 6 (Dawes & Garde 2004). These explanatory notes replace the short map description that was written to accompany the initial presentation of the map (Dawes 1992).…”