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AAPG Bulletin

Abstract


Volume: 75 (1991)

Issue: 9. (September)

First Page: 1468

Last Page: 1488

Title: Sequence Stratigraphy of the Jurassic-Lowermost Cretaceous of East Greenland (1)

Author(s): FINN SURLYK (2)

Abstract:

The Jurassic-lowermost Cretaceous succession of East Greenland was deposited in a seaway formed over a series of old extensional basins between Greenland and Norway. The succession is interpreted within a sequence stratigraphic framework with the main emphasis on the Middle and Upper Jurassic. The vertical and lateral dimensions of the stratigraphic units are measured in kilometers and hundreds of kilometers, respectively. The interpretation is comparable to seismic-scale sequence stratigraphy, and the results can be compared directly to those derived from conventional reflection-seismic studies of subsurface successions. Sequence boundaries, and thus sequences, are defined differently by various research groups. In contrast, Previous HitsystemsNext Hit Previous HittractsNext Hit representing linkages of deposi ional Previous HitsystemsNext Hit are considered the basic building blocks in both genetic and sequence stratigraphy. In the present study, Previous HitsystemsNext Hit Previous HittractsNext Hit are recognized as the unit of highest rank within the concept of sequence stratigraphy. Ten major Previous HitsystemsNext Hit Previous HittractsNext Hit are recognized. A Pliensbachian-Toarcian transgressive Previous HitsystemsNext Hit tract consisting of a slightly retrogradational parasequence set is overlain by a thin uppermost Toarcian-Aalenian(?) highstand Previous HitsystemsNext Hit tract (290-420 m in total thickness). The 140-700 m thick upper Bajocian-middle Callovian interval is represented by a basal aggradational to slightly retrogradational parasequence set interpreted as a shelf margin Previous HitsystemsNext Hit tract transitional to a transgressive Previous HitsystemsNext Hit tract. This interval is overlain by a strongly onlapping retrogradational set form d under rapid Previous HitseaNext Hit Previous HitlevelNext Hit rise and high sediment input, and interpreted as a transgressive Previous HitsystemsNext Hit tract. The upper Callovian-middle Oxfordian forms a composite progradational parasequence set that downlaps onto the top of the transgressive Previous HitsystemsNext Hit tract and represents a highstand Previous HitsystemsNext Hit tract. The transitional strata between the two Previous HitsystemsNext Hit Previous HittractsNext Hit are highly condensed distally and contain the maximum flooding surface. Major regional deepening began in the late Oxfordian, and a thick succession of shales and turbiditic gully sandstones was deposited across the whole region. This succession represents another transgressive Previous HitsystemsNext Hit tract formed during a rapid Previous HitseaNext Hit Previous HitlevelNext Hit rise reaching highstand in the early Volgian when a sandy highstand Previous HitsystemsNext Hit tract prograded into the basin. The middle Volg an-Valanginian interval was characterized by rotational block faulting in northern East Greenland, in contrast to southern East Greenland, which continued its regular subsidence. A succession of a lowstand or shelf margin Previous HitsystemsNext Hit tract, a transgressive Previous HitsystemsNext Hit tract, and a highstand Previous HitsystemsNext Hit tract is recognized in both regions. This similarity may allow separation of Previous HitseaNext Hit Previous HitlevelNext Hit and tectonic signals in the two contemporaneous successions.

The sequence stratigraphic analysis forms the basis for a coherent genetic model for the Jurassic-lowermost Cretaceous succession. The model may prove to be of value in interpreting deeply buried correlative hydrocarbon reservoirs in the northern North Previous HitSeaTop and the Norwegian shelf.

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