Establishing a Provenance Framework for Sandstones in the Greenland–Norway Rift from the Composition of Moraine/Outwash Sediments

Adam G Szulc,Andrew C Morton,Andrew G Whitham,Stuart N Thomson,Sidney R Hemming

doi:10.3390/geosciences12020073

Abstract

The crystalline basement and Caledonian orogenic belt of East Greenland between 70 and 78° N are divided into five source regions on the basis of heavy mineral assemblages, mineral geochemistry, and isotopic age data from 42 modern moraine/outwash samples. The sand types generated by the five source regions can be recognized in the Mesozoic sedimentary rocks of Mid-Norway, and are named, from south to north, MN7 (Gåseland), MN4i (Milne Land–Renland), MN2ii (Hinks Land–Suess Land), MN2iii (Payer Land–Dronning Louise Land), and MN6 (Germania Land). These provide a framework for interpreting the provenance of Greenland–Norway rift sedimentary deposits. The provenance characteristics of Liverpool Land have also been defined, but whether this relatively small region merits a separate provenance status is unclear. Provenance links can be made by comparing the source region sand types with the composition of onshore and offshore sediments from previous studies. Triassic sandstones of the Nordland Ridge and the far south of the Møre Basin, along with Jurassic sandstones of the Heidrun Field in the Haltenbanken area, were derived from the MN4i source region. The provenance of Cretaceous sandstones in East Greenland can be linked to the MN2ii source region. The source of Turonian sandstones on Traill Ø can be pinpointed by zircon U–Pb ages to the Neoproterozoic Lyell Land Group of the Franz Josef Allochthon. Cretaceous sandstones in the Vøring and Møre basins were derived from the MN2iii and MN4i source regions. In addition, some of the Cenomanian–Campanian sedimentary rocks of East Greenland and Mid-Norway contain Permian–Cretaceous-aged zircon grains that are absent from the moraine/outwash samples. The most likely source of these zircon grains is the circum-Arctic region, implying the existence of a long-lived axial drainage system that entered the Greenland–Norway rift from the north.

Highlights

The crystalline basement and Caledonian rocks of East Greenland were the primary sediment sources for the adjacent Mesozoic rift basins of East Greenland, from Jameson Land in the south to Store Koldewey in the north (Figure 1)
Heavy mineral analysis and provenance-sensitive ratio determination were undertaken on all samples, with additional geochemical characterisation and radiometric dating on a variety of mineral populations from a subset
The same sand types can be recognised in the sedimentary rocks forming the Vøring and Møre Basin fill successions offshore of Mid-Norway, which are named MN2ii, MN2iii, MN4i, MN6, and MN7

Summary

Introduction

The crystalline basement and Caledonian rocks of East Greenland were the primary sediment sources for the adjacent Mesozoic rift basins of East Greenland, from Jameson Land in the south to Store Koldewey in the north (Figure 1). Previous provenance studies have shown that much of this sediment was transported offshore, where it contributed to the Vøring and Møre basins of the Mid-Norway hydrocarbon province [1,2,3,4,5,6,7]. These studies focused on Mesozoic detrital samples from onshore East Greenland and offshore Mid-Norway. The provenance characteristics of the basement source regions—a primary control on reservoir quality in Mid-Norway—have hitherto not been constrained. Geosciences 2022, 12, 73 Geosciences 2022, 12, 73 gions—a primary control on reservoir quality in Mid-Norway—have hitherto not been constrained.

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Results

Conclusion