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Geology of the Zamboanga Peninsula, Mindanao, Philippines: an enigmatic South China continental fragment?

By
Graciano P. Yumul, Jr
Graciano P. Yumul, Jr
1
National Institute of Geological Sciences, College of Science, University of the Philippines
,
Diliman, Quezon City, Philippines
rwg@i-next.net
2
Philippine Council for Industry and Energy Research & Development, Department of Science and Technology
,
Bicutan, Taguig, Metro Manila, Philippines
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Carla B. Dimalanta
Carla B. Dimalanta
1
National Institute of Geological Sciences, College of Science, University of the Philippines
,
Diliman, Quezon City, Philippines
rwg@i-next.net
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Rodolfo A. Tamayo, Jr
Rodolfo A. Tamayo, Jr
1
National Institute of Geological Sciences, College of Science, University of the Philippines
,
Diliman, Quezon City, Philippines
rwg@i-next.net
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Rene C. Maury
Rene C. Maury
3
UMR 6538, Université de Bretagne Occidentale
,
6, Avenue Le Gorgeu, B.P. 809, 29285 Brest Cedex, France
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Herve Bellon
Herve Bellon
3
UMR 6538, Université de Bretagne Occidentale
,
6, Avenue Le Gorgeu, B.P. 809, 29285 Brest Cedex, France
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Mireille Polvé
Mireille Polvé
4
UMR 5563, Université Paul Sabatier
,
38, Rue des 36 Ponts, 31400 Toulouse, France
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Victor B. Maglambayan
Victor B. Maglambayan
1
National Institute of Geological Sciences, College of Science, University of the Philippines
,
Diliman, Quezon City, Philippines
rwg@i-next.net
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Cliff L. Querubin
Cliff L. Querubin
1
National Institute of Geological Sciences, College of Science, University of the Philippines
,
Diliman, Quezon City, Philippines
rwg@i-next.net
5
Geosciences Division, Mines and Geosciences Bureau-IX
,
Zamboanga City, Mindanao, Philippines
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Joseph Cotten
Joseph Cotten
3
UMR 6538, Université de Bretagne Occidentale
,
6, Avenue Le Gorgeu, B.P. 809, 29285 Brest Cedex, France
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Published:
January 01, 2004

Abstract

Mindanao Island in the southern Philippines is made up of two blocks: the island-arc-related eastern-central Mindanao block and the continental Zamboanga Peninsula, which contains several ophiolitic bodies and mélanges. The Middle Miocene Siayan–Sindangan Suture Zone represents the tectonic boundary between the island-arc and continental blocks. A Middle Miocene age of collision is interpreted from the unconformity between the Late Miocene Motibot Formation and the underlying Middle Miocene Gunyan Mélange, which serves as basement to the suture zone. The Middle Miocene Siayan–Sindangan Suture Zone was formerly a subduction zone complex that was reactivated as a sinistral strikeslip fault following the collision of eastern-central Mindanao with the Zamboanga Peninsula. New 40K-40Ar whole-rock dating of lava flows from the Zamboanga Peninsula has revealed Middle to Late Miocene ages, which is consistent with the possible existence of an Early Miocene Sulu Trench. The possibility that the Zamboanga Peninsula could be part of the Palawan microcontinental block has been forwarded by previous workers, due to their similarity in stratigraphy, geological structure and metamorphic rock suites. The Palawan microcontinental block separated from southern China during the opening of the South China Sea in Oligo-Miocene times. If indeed the Zamboanga Peninsula was once part of Palawan, it represents the southernmost part of the rifted southeastern China continental margin.

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Contents

Geological Society, London, Special Publications

Aspects of the Tectonic Evolution of China

J. Malpas
J. Malpas
The University of Hong Kong, Hong Kong
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C. J. N. Fletcher
C. J. N. Fletcher
The University of Hong Kong, Hong Kong
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J. R. Ali
J. R. Ali
The University of Hong Kong, Hong Kong
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J. C. Aitchison
J. C. Aitchison
The University of Hong Kong, Hong Kong
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Geological Society of London
Volume
226
ISBN electronic:
9781862394742
Publication date:
January 01, 2004

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