摘要
The Timor Sea is a typical depression-type (diwa-type) sedimentary basin.Three tectolithostratigraphic layers (units) can be recognised in the area, frorn bottorn to top,i. e. the Precarnbrian sequence corresponding to the geosyncline unit (Ⅰ), with a probable NNE-SSW structural line, the Paleozoic to Triassic sequence belonging to the platform unit (Ⅱ) with a NW-SE structural grain, and the Jurassic to Cenozoic sequence being depression unit with a main NE-SW structural trend. The tectonic divisions in the area can be classified into two systems including thirteen divisions. The NE trending divisions and those trending NW intersect each other and the new ones overprint the older ones, forming a chess-board structural configuration. The Bouguer gravity anomaly in the area corresponds to its structure framework. Negative and positive anornalies alternatively distribute in short belts. Geothermal study show that higher heat flow existed in the area in late Jurassic with volcanic eruption, subsequently cooling and block-faulting. The terrestrial heat flow field is distributed in short-belts too, trending as the tectonic divisions in the area. The tectonic evolution of the area may be divided into at least three stages, i. e. the Precambrian stage, the (rifting) stage frorn Cambrian to Triassic, and the block-faulting-rifting stage from Jurassic to Cenozoic.
The Timor Sea is a typical depression-type (diwa-type) sedimentary basin.Three tectolithostratigraphic layers (units) can be recognised in the area, frorn bottorn to top,i. e. the Precarnbrian sequence corresponding to the geosyncline unit (Ⅰ), with a probable NNE-SSW structural line, the Paleozoic to Triassic sequence belonging to the platform unit (Ⅱ) with a NW-SE structural grain, and the Jurassic to Cenozoic sequence being depression unit with a main NE-SW structural trend. The tectonic divisions in the area can be classified into two systems including thirteen divisions. The NE trending divisions and those trending NW intersect each other and the new ones overprint the older ones, forming a chess-board structural configuration. The Bouguer gravity anomaly in the area corresponds to its structure framework. Negative and positive anornalies alternatively distribute in short belts. Geothermal study show that higher heat flow existed in the area in late Jurassic with volcanic eruption, subsequently cooling and block-faulting. The terrestrial heat flow field is distributed in short-belts too, trending as the tectonic divisions in the area. The tectonic evolution of the area may be divided into at least three stages, i. e. the Precambrian stage, the (rifting) stage frorn Cambrian to Triassic, and the block-faulting-rifting stage from Jurassic to Cenozoic.
