Eurasia spreading basin to Laptev Shelf transition: structural pattern and heat flow

Details Eurasia spreading basin to Laptev Shelf transition: structural pattern and heat flow Eurasia spreading basin to Laptev Shelf transition: structural pattern and heat flow

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003geoji.152..688d&link_type=abstract

Geophysical Journal International, Volume 152, Issue 3, pp. 688-698.

Astronomy and Astrophysics

Astronomy

9

Eurasia Basin, Heat Flow, Laptev Sea, Ocean-Continent Transition, Rifts, Spreading

Scientific paper

New geophysical data have become available from shipborne and satellite measurements allowing a re-evaluation of the largely unknown junction of the Arctic spreading centre and the northeastern Siberian continental margin where the transpolar mid-ocean Gakkel Ridge abuts against the continental slope of the Laptev Sea. Based on multichannel seismic reflection and gravity data, this sediment-covered spreading axis can be traced to the continental rise where it is cut-off by a transcurrent fault. Further continuation of the extensional axis into the continental slope can be attributed to two asymmetric grabens, which terminate against the prominent Khatanga-Lomonosov Fracture. Remnants of hydrothermal fauna and high heat-flow values of approximately 100 mW m-2 documented around these grabens in the up-slope area are typical for an oceanic spreading axis. Thus we consider these grabens to be morphotectonic termination of the global Atlantic-Arctic spreading system with plate motions shifting to the Khatanga-Lomonosov Fracture. The high heat flow and the distribution of earthquake epicentres allow us to assume that the present-day divergent plate tectonic boundary passes from the Gakkel Ridge to the eastern part of Laptev Sea with an offset of initial rifting along the Bel'kov-Svyatoi Nos Rift to the projected prolongation of the buried spreading axis by 140-150 km.

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