Geology of northwestern Mindoro and its offshore islands: Implications for terrane accretion in west Central Philippines
Issue Date
11-2012
Abstract
In over four decades, terrane studies of Mindoro Island have evolved from one terrane- to three terrane-models. Recent mapping of northwestern Mindoro and the islands of Lubang and Ambil roughly agrees with a 1990 suggestion that the island is composed of two terranes: the Central Range and the San Jose Platform. However, in contrast to this older model, our study, which takes into consideration the petrochemical and paleontological characteristics of the units, subdivides Northwest Mindoro into the Amnay Ophiolite and the Halcon Metamorphic terranes. Southwest-verging thrust faults parallel to the currently active Manila Trench demarcate the younger Amnay Ophiolite from the latter. Components of the older Mangyan Ophiolitic Complex, formerly thought to represent a terrane distinct from the metamorphic body, are now suggested to occur as disrupted bodies enclosed within the schists of the Halcon Metamorphics. The timing of incorporation of these megaclast materials and the regional metamorphism that occurred is constrained by the deposition of the sedimentary sequences of the Late Eocene Lasala Formation. Petrochemical studies of these younger sedimentary units reveal their continent-derived character. Therefore, accretion of the Cretaceous Mangyan Ophiolitic Complex marks the collision between the Cretaceous oceanic lithosphere and mainland Asia that is considered to be the protolith of the Halcon Metamorphics. A subsequent collision occurred which led to the amalgamation of the Amnay Ophiolite suite to the metamorphosed terrane. © 2012 Elsevier Ltd.
Source or Periodical Title
Journal of Asian Earth Sciences
ISSN
1367-9120
Volume
61
Page
78-87
Document Type
Article
Physical Description
maps, illustrations, tables, graphs
Language
English
Subject
Accretionary complex, Arc-continent collision, Geology, Mindoro, Palawan Continental Block, Tectonostratigraphic terrane
Recommended Citation
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., Queaño, K.L., Yumul, G.P. (2012). Geology of northwestern Mindoro and its offshore islands: Implications for terrane accretion in west Central Philippines. Journal of Asian Earth Sciences, 61, 78-87. doi:10.1016/j.jseaes.2012.08.006.
Identifier
doi:10.1016/j.jseaes.2012.08.006.
Digital Copy
yes