Palaeomagnetism of the Balantak ophiolite, Sulawesi

Details Palaeomagnetism of the Balantak ophiolite, Sulawesi Palaeomagnetism of the Balantak ophiolite, Sulawesi

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994e%26psl.125..193m&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 125, no. 1-4, p. 193-209

Mathematics

Logic

4

Geochronology, Geomagnetism, Igneous Rocks, Indonesia, Iron Compounds, Lava, Magnesium Compounds, Paleomagnetism, Plates (Tectonics), Silicates, Tectonics, Asia, Australia, Cretaceous Period, Geological Faults, Mesozoic Era, Stratigraphy, Subduction (Geology), Tertiary Period, Thermal Cycling Tests

Scientific paper

Paleomagnetic data from the East Arm of Sulawesi provide constraints on the Cretaceous and subsequent history of a fragment of the tectonic mosaic of a complex region close to the junction between SE Asia, the Indo-Australian plate and the western Pacific microplates. Primary thermoremanence has been demonstrated in samples from 23 sites in a tilted Cretaceous-Palaeogene lava sequence in the Balantak ophiolite at Batusimpang on the eastern tip of the East Arm of Sulawesi. Its direction (D = 60.5 deg, I = -32.1 deg, alpha(sub 95) = 5.5 deg) indicates formation at 17 +/- 4 deg S and approximately 60 deg of subsequent clockwise rotation. The primary mode of remanence is deduced from NRM/TRM comparisons; low-temperature cycling and other rock magnetic tests point to SD magnetite as the principal remanence carrier. Supporting evidence for the paleolatitude and northward movement of the East Arm is derived from other lavas at Binsil, and from the Boba Cherts, but lack of tectonic control limits the interpretation. The contrast between these results and the subequatorial origin of contemporary rocks on nearly Halmahera is consistent with subduction of Indian Ocean lithosphere beneath the Sunda margin in the late Mesozoic and early Tertiary. Large differences in declination of remanence in the E Sulawesi rocks indicate large clockwise and anticlockwise rotations of tectonic blocks only tens of kilometers across.

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