TY - JOUR
T1 - Geology and geochemistry of the clastic sequences from Northwestern Panay (Philippines)
T2 - Implications for provenance and geotectonic setting
AU - Gabo, Jillian Aira S.
AU - Dimalanta, Carla B.
AU - Asio, Mary Grace S.
AU - Queaño, Karlo L.
AU - Yumul, Graciano P.
AU - Imai, Akira
N1 - Funding Information:
The authors acknowledge the financial support given by the Department of Science and Technology – Philippine Council for Industry and Energy Research and Development, Commission on Higher Education and University of the Philippines – National Institute of Geological Sciences. Logistic and field support was extended by the provincial and local government units in Panay Island and the Mines and Geosciences Bureau – Region 6 office. Constructive insights and fruitful discussions were offered by the other project staff and members of the RWG laboratory. The authors are also grateful to Prof. Mei-Fu Zhou for the analysis of our samples. Professors Chi-Yueh Huang and Dennis Brown are acknowledged for the invitation to participate in IGCP Project 524 symposium. Comments by two anonymous reviewers are acknowledged with thanks. This is a publication related to research activities under the UNESCO-IGCP Project 524 and IGCP Project 516.
PY - 2009/12/10
Y1 - 2009/12/10
N2 - Whole-rock geochemical analysis of samples from the clastic sequences in Northwestern Panay revealed different compositional ranges for the Buruanga Peninsula and Antique Range. The results provide additional evidence that Northwestern Panay consists of two distinct terranes as a result of the arc-continent collision between the Palawan Microcontinental Block and the Philippine Mobile Belt. Major element compositions of clastic rocks from the Buruanga Peninsula (Saboncogon Formation) revealed that they belong to a continental margin tectonic setting whereas the Antique Range sedimentary rocks (Lagdo Formation) show an affinity to an oceanic island arc setting. The Fragante Formation of the Antique Range shows some similarities in tectonic setting and provenance with Buruanga Peninsula clastic rocks, which suggests a Buruanga Peninsula sediment contribution during its time of formation. Furthermore, provenance analyses from combined major and trace element data indicate a more silicic source for the Buruanga Peninsula clastics and a more mafic derivation for the sedimentary rocks of the Antique Range. These findings are consistent with previous studies suggesting that the Buruanga Peninsula forms part of the Palawan Microcontinental Block and the Antique Range belongs to the Philippine Mobile Belt. The Palawan Microcontinental Block is believed to be a drifted continental fragment from the Mesozoic East Asian accretionary complex in the southern part of the Eurasian mainland, which represents the continental margin setting and felsic source of the Buruanga Peninsula clastic rocks. Meanwhile, the oceanic island setting and mafic source of the Antique Range clastic rocks represent the volcanic rocks of the Philippine Mobile Belt that were formed as a result of the subduction of the leading oceanic edge of the Palawan Microcontinental Block.
AB - Whole-rock geochemical analysis of samples from the clastic sequences in Northwestern Panay revealed different compositional ranges for the Buruanga Peninsula and Antique Range. The results provide additional evidence that Northwestern Panay consists of two distinct terranes as a result of the arc-continent collision between the Palawan Microcontinental Block and the Philippine Mobile Belt. Major element compositions of clastic rocks from the Buruanga Peninsula (Saboncogon Formation) revealed that they belong to a continental margin tectonic setting whereas the Antique Range sedimentary rocks (Lagdo Formation) show an affinity to an oceanic island arc setting. The Fragante Formation of the Antique Range shows some similarities in tectonic setting and provenance with Buruanga Peninsula clastic rocks, which suggests a Buruanga Peninsula sediment contribution during its time of formation. Furthermore, provenance analyses from combined major and trace element data indicate a more silicic source for the Buruanga Peninsula clastics and a more mafic derivation for the sedimentary rocks of the Antique Range. These findings are consistent with previous studies suggesting that the Buruanga Peninsula forms part of the Palawan Microcontinental Block and the Antique Range belongs to the Philippine Mobile Belt. The Palawan Microcontinental Block is believed to be a drifted continental fragment from the Mesozoic East Asian accretionary complex in the southern part of the Eurasian mainland, which represents the continental margin setting and felsic source of the Buruanga Peninsula clastic rocks. Meanwhile, the oceanic island setting and mafic source of the Antique Range clastic rocks represent the volcanic rocks of the Philippine Mobile Belt that were formed as a result of the subduction of the leading oceanic edge of the Palawan Microcontinental Block.
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U2 - 10.1016/j.tecto.2009.02.004
DO - 10.1016/j.tecto.2009.02.004
M3 - Article
AN - SCOPUS:70450230742
SN - 0040-1951
VL - 479
SP - 111
EP - 119
JO - Tectonophysics
JF - Tectonophysics
IS - 1-2
ER -