Deep crustal profile across NW Sabah basin

Integrated potential field data and seismic reflection

Akhmal Sidek, Umar Hamzah, Abdul Rahim Samsudin, Mohd Hariri Arifin, Radzuan Junin

Research output: Contribution to journalArticle

Abstract

The crustal model has been created from the integration of potential field data and complemented by multichannel reflection seismic profiles, allowing the interpretation of five tectono-stratigraphy provinces of Deepwater Fold and Thrust Belt, Sabah Trough, Dangerous Grounds Province and Thrust Sheet Zone. The free-air and magnetic anomaly was published from satellite altimetry data. Seismic interpretation displays structural anticline that indicate fold and thrust zone as the Sabah Trough frontier to the southeast. The formation of half-grabens and normal faults was clearly indicated extension in the entire Dangerous Grounds which subducted beneath to the Sabah Trough. The crustal modelling was used to describe and determine the Moho thickness and the configuration of deeper crustal layer by using the GM-SYS Profile Modelling software. The range of Moho thickness shows slightly variable between 33 and 26 km across of the study area. Analytical signal analysis estimated the depth of magnetic source range between 26 and 33 km disclosed to upper crust. The high density surrounded by low density body at Thrust Sheet Zone interpreted as a thrust block built of Palaeogene Crocker sediment.

Original languageEnglish
Pages (from-to)1401-1411
Number of pages11
JournalARPN Journal of Engineering and Applied Sciences
Volume11
Issue number3
Publication statusPublished - 2016

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Stratigraphy
Signal analysis
Sediments
Satellites
Air

Keywords

  • Analytical signal
  • Crustal model
  • Free-air gravity anomaly
  • Magnetic anomaly
  • NW sabah basin

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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title = "Deep crustal profile across NW Sabah basin: Integrated potential field data and seismic reflection",
abstract = "The crustal model has been created from the integration of potential field data and complemented by multichannel reflection seismic profiles, allowing the interpretation of five tectono-stratigraphy provinces of Deepwater Fold and Thrust Belt, Sabah Trough, Dangerous Grounds Province and Thrust Sheet Zone. The free-air and magnetic anomaly was published from satellite altimetry data. Seismic interpretation displays structural anticline that indicate fold and thrust zone as the Sabah Trough frontier to the southeast. The formation of half-grabens and normal faults was clearly indicated extension in the entire Dangerous Grounds which subducted beneath to the Sabah Trough. The crustal modelling was used to describe and determine the Moho thickness and the configuration of deeper crustal layer by using the GM-SYS Profile Modelling software. The range of Moho thickness shows slightly variable between 33 and 26 km across of the study area. Analytical signal analysis estimated the depth of magnetic source range between 26 and 33 km disclosed to upper crust. The high density surrounded by low density body at Thrust Sheet Zone interpreted as a thrust block built of Palaeogene Crocker sediment.",
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AU - Hamzah, Umar

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AU - Junin, Radzuan

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AB - The crustal model has been created from the integration of potential field data and complemented by multichannel reflection seismic profiles, allowing the interpretation of five tectono-stratigraphy provinces of Deepwater Fold and Thrust Belt, Sabah Trough, Dangerous Grounds Province and Thrust Sheet Zone. The free-air and magnetic anomaly was published from satellite altimetry data. Seismic interpretation displays structural anticline that indicate fold and thrust zone as the Sabah Trough frontier to the southeast. The formation of half-grabens and normal faults was clearly indicated extension in the entire Dangerous Grounds which subducted beneath to the Sabah Trough. The crustal modelling was used to describe and determine the Moho thickness and the configuration of deeper crustal layer by using the GM-SYS Profile Modelling software. The range of Moho thickness shows slightly variable between 33 and 26 km across of the study area. Analytical signal analysis estimated the depth of magnetic source range between 26 and 33 km disclosed to upper crust. The high density surrounded by low density body at Thrust Sheet Zone interpreted as a thrust block built of Palaeogene Crocker sediment.

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