Paleomagnetic studies combined with fission-track datings on the western arc of Sulawesi, east Indonesia

Petrologic, isotopic, and radiometric age constraints on the origin and tectonic history of the Malino Metamorphic Complex, NW Sulawesi, Indonesia

“…Rangin et al (1990) proposed that the MMC originated in south China from which it rifted away during the Tertiary, with a volcanic arc developing on it while it travelled southwards. This model is not supported by available paleomagnetic data that indicate that the North Arm of Sulawesi did not undergo any signiWcant latitudinal shift during the Tertiary (Sasajima et al, 1980;Surmont et al, 1994;Walpersdorf et al, 1998). Kavalieris et al (1992) brieXy discussed the possibility that the MMC is a metamorphic core complex, the formation of which they linked to the collision of the Banggai-Sula microcontinent with eastern Sulawesi, which they assumed took place during the Middle Miocene.…”

Tectonostratigraphic evolution of Cenozoic marginal basin and continental margin successions in the Bone Mountains, Southwest Sulawesi, Indonesia

“…Results of reconnaissance paleomagnetic investigations suggest a counterclockwise rotation of SW Sulawesi of 35-50°sometime during the period of 63-13 Ma (Haile, 1978;Sasajima et al, 1980). Shear portioning along wrench faults resulted in the formation of a marginal basin bordered to the west of Sundaland, while a new westerly-dipping subduction zone was created along its eastern side.…”

Stratigraphy and tectonic setting of the Cretaceous and Paleogene volcanic-sedimentary successions in northwest Sulawesi, Indonesia: implications for the Cenozoic evolution of Western and Northern Sulawesi

“…However, both the measurements themselves (taken in a major fault zone) and their interpretation are suspect (Surmont et al, 1994;Hall, 1996;. A much smaller rotation of about 20-258 is indicated by other paleomagnetic studies (Sasajima et al, 1980;Surmont et al, 1994), geodynamic reconstructions (a) regional extension, formation of Makassar Straits; graben and half-graben fill with fluvio-deltaic to shallow marine siliclastics; fault induced topography is subsequently buried and region becomes a stable shallow marine shelf; calc-alkaline volcanism related to westerly directed subduction, (b) generally slight rise in sea level; platform limestone persists in South Arm; (c) subduction/volcanism slows down/ceases; (c) regional extension resulting in block-faulting, local tilting and folding of Paleogene strata; accompanied by potassic magmatism, which continues into Pliocene; (d) Banggai-Sula microcontinent collides with eastern Sulawesi causing thick-skinned thrusting and folding, uplift and deposition of syn-to late orogenic sediments; unroofing of Miocene granitoids;? formation of metamorphic core complexes.…”

“…Hamilton, 1979;Sikumbang, 1986Sikumbang, , 1990. It is generally assumed that eastern Kalimantan and Western Sulawesi were positioned closer prior to the midPaleogene, based on similarities in Meosozoic and early Paleogene stratigraphy (Hamilton, 1979;van Leeuwen, 1981), basement fabrics (Calvert, 2000), and paleomagnetic data (Haile, 1978;Sasajima et al, 1980;Fuller et al, 1999). Isotopic compositions available for Latimojong and Tinombo Formation sediments from NW Sulawesi (Elburg et al, 2003) are very similar to those of Upper Cretaceous sedimentary rocks in the south arm of Sulawesi and Sumba (Vroon et al, 1996;Elburg and Foden, 1999), which according to Vroon et al (1996) have a Sundaland isotopic signature, including relatively unradiogenic Pb.…”