SUBSURFACE STRUKTURAL MODEL OF BURU, SERAM, AND SURROUNDING ISLANDS USING GRAVITY AND AEROMAGNETIC DATA
Buru, Seram and surroundings islands, have a complex structure due to interaction between Australian and Pacific plates. Buru and Seram Island are composed of the same Paleozoic metamorphic rocks; Mesozoic-Quaternary volcanic rocks and marine-terrestrial sediments. Ambon, Haruku, and Saparua, con...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/71310 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Buru, Seram and surroundings islands, have a complex structure due to interaction between
Australian and Pacific plates. Buru and Seram Island are composed of the same Paleozoic
metamorphic rocks; Mesozoic-Quaternary volcanic rocks and marine-terrestrial sediments.
Ambon, Haruku, and Saparua, consist of andesitic volcanic rocks. Even though the islands are
located closely to each other, the tectonic setting is still debatable due to significantly different
structures. To understand its tectonics setting, a study was carried out using aeromagnetic data
and gravity from ground survey. Structural delineation is carried out by processing the total
horizontal gradient from complete Bouguer anomaly and aeromagnetic data which are then used
to support the forward modeling. Metamorphic uplifting seen from forward modeling where on
Buru Island is due to batholith intrusion while Seram is thrust faults. Origin mechanism of the two
islands was once as a microplate with a north-south trending and separated by Pacific Plate
movement. Buru Island as the northern and Seram the southern part of microplate, rotated around
225? and 90? counterclockwise to reach its present position. The large number of heat sources in
the study area is also assumed caused by fractures from the rotational movement, besides from
volcanic arc activity.
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