Geology of southeast Bohol, central Philippines: accretion and sedimentation in a marginal basin

Faustino, D. V., Yumul, J., De Jesus, J. V., Dimalanta, C. B., Aitchison, J. C., Zhou, M-F., Tamayo, J. and De Leon, M. M. (2003) Geology of southeast Bohol, central Philippines: accretion and sedimentation in a marginal basin. Australian Journal of Earth Sciences, 50 4: 571-583. doi:10.1046/j.1440-0952.2003.01015.x


Author Faustino, D. V.
Yumul, J.
De Jesus, J. V.
Dimalanta, C. B.
Aitchison, J. C.
Zhou, M-F.
Tamayo, J.
De Leon, M. M.
Title Geology of southeast Bohol, central Philippines: accretion and sedimentation in a marginal basin
Journal name Australian Journal of Earth Sciences   Check publisher's open access policy
ISSN 0812-0099
1440-0952
Publication date 2003
Year available 2003
Sub-type Article (original research)
DOI 10.1046/j.1440-0952.2003.01015.x
Volume 50
Issue 4
Start page 571
End page 583
Total pages 13
Place of publication Abingdon, Oxfordshire, United Kingdom
Publisher Taylor and Francis
Language eng
Formatted abstract
Recent field mapping has refined our understanding of the stratigraphy and geology of southeastern Bohol, which is composed of a Cretaceous basement complex subdivided into three distinct formations. The basal unit, a metamorphic complex named the Alicia Schist, is overthrust by the Cansiwang mélange, which is, in turn, structurally overlain by the Southeast Bohol Ophiolite Complex. The entire basement complex is overlain unconformably by a ∼2000 m thick sequence of Lower Miocene to Pleistocene carbonate and elastic sedimentary rocks and igneous units. Newly identified lithostratigraphic units in the area include the Cansiwang mélange, a tectonic mélange interpreted as an accretionary prism, and the Lumbog Volcaniclastic Member of the Lower Miocene Carmen Formation. The Cansiwang mélange is sandwiched between the ophiolite and the metamorphic complex, suggesting that the Alicia Schist was not formed in response to emplacement of the Southeast Bohol Ophiolite Complex. The accretionary prism beneath the ophiolite complex and the presence of boninites suggest that the Southeast Bohol Ophiolite Complex was emplaced in a forearc setting. The Southeast Bohol Ophiolite Complex formed during the Early Cretaceous in a supra-subduction zone environment related to a southeast-facing arc (using present-day geographical references). The accretion of this ophiolite complex was followed by a period of erosion and then later by extensive clastic and carbonate rock deposition (Carmen Formation, Sierra Bullones Limestone and Maribojoc Limestone). The Lumbog Volcaniclastic Member and Jagna Andesite document intermittent Tertiary volcanism in southeastern Bohol.
Keyword Accretion
Bohol Province
Marginal basin
Ophiolite
Philippines
Stratigraphy
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Geography, Planning and Environmental Management Publications
 
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Created: Wed, 29 Jul 2015, 13:58:48 EST by Helen Smith on behalf of School of Geography, Planning & Env Management