Petrography, geochemistry, and tectonics of a rifted fragment of Mainland Asia: Evidence from the Lasala Formation, Mindoro Island, Philippines

R. A.B. Concepcion, C. B. Dimalanta, G. P. Yumul, D. V. Faustino-Eslava, K. L. Queaño, R. A. Tamayo, A. Imai

研究成果: Contribution to journalArticle査読

44 被引用数 (Scopus)

抄録

Petrological and geochemical investigations of the sedimentary Lasala formation in northwest Mindoro, Philippines, offer new insights into the origin of this geologically contentious region. Mindoro island's position at the boundary between Sundaland and the Philippine Mobile Belt 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. Major oxide, trace element abundances, and various elemental ratios similarly impart a strongly felsic signature. These characteristics are taken to indicate a chiefly continental, passive margin derivation and deposition of the Lasala sediments during the Eocene. The weak indication of active margin influence is suggested to be an inherited signature, supported by paleogeographic models of the southeastern Asian margin area during the pre-Cenozoic.

本文言語英語
ページ(範囲)273-290
ページ数18
ジャーナルInternational Journal of Earth Sciences
101
1
DOI
出版ステータス出版済み - 1 2012

All Science Journal Classification (ASJC) codes

  • 地球惑星科学(全般)

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