Arc-crustal compression and its effects on the underlying mantle geometry as elucidated from the potential field signatures of the buckled Cretaceous Cebu lithosphere, Philippines

The occurrence of long wavelength Moho undulations in continental and oceanic lithospheres is attributed to lithospheric buckling. This has been reported for Cretaceous or older lithospheres under compressional regimes. However, there is very limited data on lithospheric buckling of oceanic island a...

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Bibliographic Details
Published in:Tectonophysics 2022-05, Vol.831, p.229341, Article 229341
Main Authors: Parcutela, Nathaniel E., Austria, Rurik S.P., Dimalanta, Carla B., Armada, Leo T., Yumul, Graciano P.
Format: Article
Language:English
Subjects:
Arc lithosphere
Belts
Bouguer anomaly
Buckling
Compression
Configurations
Cretaceous
Deformation
Euler solutions
Folding
Gravity data
Impingement
Island arcs
Lithosphere
Magnetic data
Miocene
Moho
Ocean circulation
Oceanic islands
PCB
Polychlorinated biphenyls
Potential field
Potential fields
Upwelling
Wavelength
Wavelengths
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Summary:The occurrence of long wavelength Moho undulations in continental and oceanic lithospheres is attributed to lithospheric buckling. This has been reported for Cretaceous or older lithospheres under compressional regimes. However, there is very limited data on lithospheric buckling of oceanic island arcs. The region where the Cretaceous Cebu arc is under compression due to the impingement of the Palawan micro-Continental Block (PCB) to the Philippine Mobile Belt (PMB). The configuration of the inferred buckled Cretaceous Cebu arc lithosphere is derived from geologic and combined onshore and airborne gravity and magnetics datasets. Subsurface modeling using gravity data revealed the presence of mantle upwelling beneath Central Cebu. This could be considered as one of the crests of long-wavelength Moho undulations commonly attributed to a buckled lithosphere. The oceanic basement was also modelled to determine its configuration. Euler solutions derived from magnetic data showed that the contact between the arc crustal units of the Cansi Volcanics and Pandan Formation is affected by short wavelength folding with wavelengths ranging from 5 to 15 km. The younger arc crustal units are affected by tighter folding with wavelengths ranging from 1 to 5 km. The occurrence of a buckled arc lithosphere is being considered for the first time in this area. The consistent NE-SW folding axes inferred for the folding events strongly suggest that these are consequences of the Middle Miocene collision involving the Philippine Mobile Belt and the Palawan micro-Continental Block. •Lithospheric buckling in the Visayan Basin is considered for the first time.•Lithospheric buckling accounts for the topographic and Moho undulations in the Visayan Basin.•First model for buckled arc lithosphere highlights its intermediate nature between oceanic and continental lithospheres.
ISSN:0040-1951
1879-3266
DOI:10.1016/j.tecto.2022.229341