Abstract
The area between Grandjean Fjord and Bessel Fjord was the focus in 1988 of regional geological investigations and 1:500000 mapping during the North-East Greenland project (Henriksen, 1989). The greater part of the area forms part of the East Greenland Caledonides and can be divided into three distinct rock groups: infracrustal gneisses and granites of possibie Archaean or early Proterozoic origin; a metasedimentary sequence which has probably suffered both mid-Proterozoic and Caledonian migmatisation and metamorphism; and the late Proterozoic Eleonore Bay Group, a thick sedimentary sequence which has undergone amphibolite facies Caledonian metamorphism in its lower parts and is intruded by Caledonian granites. Aspects of the stratigraphy and sedimentology of the Eleonore Bay Group are described by Sønderholm et al. (1989); only the structures affecting the sequence are described here.
Highlights
Caledonian and pre-Caledonian geology of the region between Grandjean Fjord and Bessel Fjord (75°-76°N), North-East Greenland
The infracrustal crystalline rocks in the region studied occur in an arcuate belt running from the inner part of Grandjean Fjord northwards along the margin of the Inland Ice to inner Bessel Fjord, curving to follow the north side of Bessel Fjord
The eomplex is bordered to the east by a thick migmatitic metasedimentary sequence or by the Eleonore Bay Group outcrop
Summary
Bands and schlieren of mica schists and amphibolites interleaved with the gneisscs are common in [he whole area. A S-IO km wide zone bardering [he SmalIcfjord supracrustal seqllenee is characterised by N-S trending structures all dipping to [he east (45°~85°) where some units are strongl)' tectonised and fIatteneu West of this zone, belts oecur Wilh llal-lying and recumhent structllres as well as helts oL uften narrow, steepsided N-S trending folds. There are, rapid lateral facies variations as well as a complete absence of sedimentary structures, such that it is not possibie to establish a coherent stratigraphical succession Both the lower and the upper boundaries are tectonic and the sequence is so highly deformed on a regional scale that it is only possible to infer a minimum thickness of one kilometre on the basis of the field work. The overlying Eleonore Bay Group sequence is cut by some of the veins, which are referred to a Caledonian magmatic event
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