Segmentation of the eastern North Greenland oblique-shear margin — Regional plate tectonic implications

Details Segmentation of the eastern North Greenland oblique-shear margin — Regional plate tectonic implications Segmentation of the eastern North Greenland oblique-shear margin — Regional plate tectonic implications

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010e%26psl.292..239d&link_type=abstract

Earth and Planetary Science Letters, Volume 292, Issue 3-4, p. 239-253.

Computer Science

5

Scientific paper

Late Cenozoic opening of the Fram Strait led to formation of the NW-SE striking, eastern North Greenland oblique-shear margin at transition from the Norwegian-Greenland Sea to the SW Eurasia Basin. Onshore geology exposed on large peninsulas in front of the major Greenland Inland Ice reveals a highly complex, Paleozoic-early Cenozoic pre-opening setting. However, due to extreme ice conditions, very little is known about the offshore areas seawards of - and between - the peninsulas. Consequently, prevailing structural-tectonic models of the margin tend to be significantly oversimplified and inadequate. We present the first, combined onshore-offshore, model of the margin integrating onshore outcrops with potential field data, new offshore seismic reflection data and receiver-function analysis of seismic broad band data. The results reveal a margin which is far more complex than previously anticipated. In particular, we interpret strong margin segmentation along N/NE-striking fault structures. The structures are likely to have formed by Late Mesozoic-early Cenozoic strike-slip tectonics and have continued to be active during the late Cenozoic. A more than 8 km deep sedimentary basin is interpreted to underlie the central Wandel Sea, confined by these N/NE-striking structures. We suggest that similar margin segmentation affected the conjugate Yermak Plateau-North Svalbard margin as well as parts of the NE Greenland margin to the SE. Hence, the results have important implications for the general understanding of the Mesozoic-early Cenozoic development of the intra-continental De Geer Mega-shear Region between North Greenland and Eurasia.

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