부산대학교 도서관

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.gr.2006.04.008 Byline: J.G. Meert, Endale Tamrat Keywords: Marion hotspot; Paleomagnetism; Madagascar; Cretaceous; Paleolatitude Abstract: The island of Madagascar experienced widespread magmatism at ca. 90 Ma due to its interaction with the Marion hotspot. Previous paleomagnetic data from igneous rocks in the southwestern and northwestern regions of the island indicated that the Marion hotspot has remained fixed for the past 90 Ma. We report paleomagnetic data from northeastern Madagascar (d'Analava Complex). Samples were collected from basalts, rhyolites, gabbros and a dolerite dyke. Sixty samples from 5 sites yield a paleomagnetic pole at 66.7[degrees]S, 43.5[degrees]E (A95=10.7[degrees]) and a grand mean pole (GMP) calculated from 10 different studies covering the entire island of Madagascar falls at 68.9[degrees]S, 49.0[degrees]E (A95=4.4[degrees]). This pole translates to a paleolatitude for the Volcan de l'Androy (focal point of the hotspot) at 45.2[degrees]+6[degrees]/-5[degrees]S compared to the current location of the Marion hotspot at [approximately equal to]46[degrees]S. Our results confirm, and expand upon, previous studies that argue for the fixity of the Marion hotspot for the past 90 Ma. Author Affiliation: Department of Geological Sciences, University of Florida, 241 Williamson Hall, Gainesville, FL 32611, United States Article History: Received 3 November 2005; Accepted 11 April 2006