Abstract
This chapter discusses the structure and geological features of the Sulu Sea. The tectonic events of eastern Sabah reflect the tectonic history of the Sulu Sea. The fabric of the marginal basin trends to south-westerly towards Sabah. The initial rifting and sea-floor spreading to give pillow basalts occurs in the Lower Miocene. Only Middle Miocene and younger formations of Sabah show coherent structures. The eastern Sabah formations, which pre-date the initiation of the SE Sulu Sea, are imbricated and show no coherent structure. Only locally coherent areas can be analyzed structurally, but there is no broad-scale continuity. Faults abound in the pre-Lower Miocene formations. The chapter discusses the north–west Sulu Sea, cagayan ridge, Sulu–Zamboanga–Negros subduction system, and relationship to sabah stratigraphy. The north–west Sulu Sea has a thick crust and the most attractive interpretation. Miocene carbonate sediments are dredged from another seamount on the Cagayan Ridge. The south–east Sulu Sea is divided into five structural zones.
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