Tectonophysics2022，Vol.83114.DOI:10.1016/j.tecto.2022.229341

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

Parcutela, Nathaniel E. Austria, Rurik S. P. Dimalanta, Carla B. Armada, Leo T. Yumul, Graciano P., Jr.
Tectonophysics2022，Vol.83114.DOI:10.1016/j.tecto.2022.229341
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  • NSTL
  • Elsevier

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

Parcutela, Nathaniel E. 1Austria, Rurik S. P. 1Dimalanta, Carla B. 1Armada, Leo T. 1Yumul, Graciano P., Jr.2
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作者信息

  • 1. Univ Philippines
  • 2. Cordillera Explorat Co Inc
  • 折叠

Abstract

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.

Key words

Cretaceous/Bouguer anomaly/Euler solutions/Buckling/Arc lithosphere/Potential field/SOUTHEAST BOHOL OPHIOLITE/ISLAND-ARC/CONTINENTAL LITHOSPHERE/SEISMIC-REFLECTION/PLATE CONVERGENCE/COLLISION ZONE/CENTRAL-ASIA/GRAVITY/SUBDUCTION/CONSTRAINTS

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出版年

2022
Tectonophysics

Tectonophysics

EISCI
ISSN：0040-1951
被引量1
参考文献量92
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