Paleomagnetism and multi-model stereo photogrammetry of the West Greenland flood volcanic province

Details Paleomagnetism and multi-model stereo photogrammetry of the West Greenland flood volcanic province Paleomagnetism and multi-model stereo photogrammetry of the West Greenland flood volcanic province

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmgp72b1011r&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #GP72B-1011

Mathematics

Logic

1224 Photogrammetry, 1500 Geomagnetism And Paleomagnetism, 1527 Paleomagnetism Applied To Geologic Processes, 1599 General Or Miscellaneous

Scientific paper

We present new paleomagnetic and multi-model photogrammetry data from the West Greenland part of the North Atlantic igneous province (NAIP). During fieldwork the paleomagnetic sampling sites were photographed from helicopter with stereoscopic overlap and in colour. The photographs have been set up for multi-model photogrammetry allowing three-dimensional lithological mapping, giving us important information for interpreting the paleomagnetic data in their stratigraphic context. Another advantage of the multi-model photogrammetry coverage is that individual lavas can be traced in three-dimensional space allowing very precise measurements of the attitude of strata (+/-0.5°) to be made for tectonic correction of the paleomagnetic data. The paleomagnetic study is based on a large collection of 586 oriented paleomagnetic drill cores collected from 81 lava flows. All sampled flows carry stable thermoremanent magnetization of reversed polarity. The earliest part of the volcanic sequence (i.e. Vaigat Fm.) is characterized by several consecutive flows recording statistically indistinguishable paleomagnetic field directions. The thickest Vaigat Fm. directional group consists of 37 lava flows (combined thickness 104 meter), which based on photogrammetry and XRF observations we interpret to represent a single flow field (i.e. one eruption consisting of several lavas erupted in a short period of time). If Paleocene paleosecular variation was similar to Holocene variations, the thick directional groups would form within 100 years implying an extreme volcanic activity at the onset of NAIP volcanism on West Greenland. Based on directional groups we obtain a new well-defined paleomagnetic pole for Greenland, which is statistically similar to a recently published NAIP pole from Faroe Islands (Riisager et al., 2002) rotated to Greenland. The corresponding paleolatitude of the central NAIP in Paleocene is ~20° south of the present latitude of the Iceland hotspot, indicating that the Iceland hotspot has moved north since Paleocene. References: Riisager et al., 2002. Earth Planet. Sci. Lett., 201, 261-276.

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