Geology and evolution of Northwestern Mindoro and its offshore Islands
Speaker:Chen-Wei Wang
Date:2012/11/15Abstract
Mindoro and the smaller islands of Lubang and Ambil lie along a broad where the imprints of the suturing of the Palawan Continental Block (PCB) and the Philippine Mobile Belt (PMB) are well exposed. However, Mindoro islandˇ¦s position at the boundary between Palawan Continental Block(PCB) and the Philippine Mobile Belt(PMB) has led to variable suggestions as to how much of it is continent derived or not.
The Eocene Lasala formation overlies the Jurassic Halcon metamorphics, a regionally metamorphosed suite generally thought to have formed as a result of arc- continent collision processes. The sedimentary formation consists mainly of sandstones and shales interbedded with mudstones, basalt flows, and subordinate limestones and conglomerates. Petrographic information on the Lasala clastic rocks demonstrates a uniform framework composition that is predominantly quartzose. Current research also suggests that these younger sedimentary units are of continent-derived character.
In this study, petrographic, geochemical and paleontological analyses of the northwest Mindoro and its offshore island, Philippines, offer new insights into the origin of this geologically contentious region.
References
Canto, A.P.B., Padrones, J.T., Concepcion, R.A.B., Perez, A.D.C., Tamayo, R.A., Dimalanta, C.B., Faustino-Eslava, D.V., Queano, K.L., Yumul, G.P., Geology of Northwestern Mindoro and its offshore Islands: Implications for Terrane Accretion in West Central Philippines, Journal of Asian Earth Sciences (2012)
R. A. B. Concepcion, C. B. Dimalanta, G. P. Yumul Jr, D. V. Faustino-Eslava, K. L. Quean?o, R. A. Tamayo Jr, A. Imai, Petrography, geochemistry, and tectonics of a rifted fragment of Mainland Asia: evidence from the Lasala Formation, Mindoro Island, Philippines, Int J Earth Sci (Geol Rundsch) (2012).