Provenance Studies in
East Greenland and Mid-Norway Provide Insights into Jurassic Sediment
Transport Paths in the Norway-Greenland Rift
Whitham, Andrew G.1,
Andrew C. Morton2, Dominic P. Strogen1, Caroline S.
Pickles3, C. Mark Fanning4, Claire R. Hallsworth2,
Mary A. K. Turton1 (1) University of Cambridge, Cambridge, United
Kingdom (2) HM Research Associates Ltd, Leicestershire, United Kingdom (3)
Chevron Texaco, Aberdeen, United Kingdom (4) The Australian National
University, Canberra, Australia
A heavy mineral study was undertaken on over 900 Jurassic-Recent
sandstone samples from the Norway-Greenland rift. These sandstones were from
wells in Mid-Norway. Conventional heavy mineral analysis was supplemented with
geochemical analysis of garnets and tourmalines from selected samples. A more
limited subset was selected for SHRIMP U-Pb dating of detrital zircon grains.
mineral work has enabled identification of six distinct sediment source terrains,
MN1- MN6. Zircon age dating indicates that the
Greenland margin of the rift supplied sediment
with distinctive populations of Early Proterozoic and Archean zircons (sand
types MN2, MN4, MN6), which are absent in sediment supplied from source areas
on the Norwegian margin (sand types MN1, MN3, MN5). All these source terrains
are long-lived and have provided sands to the rift since at least the Jurassic.
However, the influence of different source areas has varied through time. For
example, sediment from a sediment source area to the west of the
Basin, in East Greenland (MN4), is found in
wells in the western parts of the Halten Terrace, of Mid-Norway, at times
during the Jurassic. It is also clear that sand from a source area in the
Western Gneiss region of Norway (MN3) found its way to the eastern side of the
Basin in the Jurassic. These observations have
important implications for understanding reservoir development in Mid-Norway.