|Kau Bay, Halmahera: regional setting, physiography and shallow structure|
van der Linden, W.J.M.; Hartosukohardjo, S.; Sukardjono, H. (1989). Kau Bay, Halmahera: regional setting, physiography and shallow structure. Neth. J. Sea Res. 24(4): 573-581
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
|Authors|| || Top |
- van der Linden, W.J.M.
- Hartosukohardjo, S.
- Sukardjono, H.
Kau Bay is a small pear-shaped marine basin, perched in between the northern and northeastern arms of the Island of Halmahera. Halmahera is part of a late Cretaceous-early Tertiary volcanic arc of which the forearc (Northeast Halmahera) was uplifted and emplaced in late Eocene time. In the Pliocene, after a long period of quiescence, while Halmahera and the Molucca Sea region were firmly incorporated within the Philippine Sea Plate, volcanic activity resumed in West Halmahera, this time the result of east-directed subduction of the Molucca Sea Plate, and thus East Halmahera converted to a backarc position. Kau Bay is separated from the Pacific Ocean by a shallow sill, which hampers ventilation of the waters of the bay. A gently sloping, tide-influenced 'coastal plain' separates volcanic and ultramafic high terrain from the basin slope and consists of sandy beaches, mud flats and mangrove swamps that are interspersed with rocky headlands and promontories. Sediment passes to the 470-m-deep, flat-floored basin through numerous canyons that cut the slope. The bay is underlain by flat-lying sediments over an irregular block-faulted subsurface, similar to the structure of what constitutes the uplifted basement complex of Northeast Halmahera.