Implications of gravity data from East Kalimantan and the Makassar Straits: a solution to the origin of the Makassar Straits?

A new depositional and provenance model for the Tanjung Formation, Barito Basin, SE Kalimantan, Indonesia

“…It is reported to be defined by the onshore extension of the NW-SE-trending Paternoster Fault Zone (e.g. Cloke et al, 1999;Wain and Berod, 1989), termed the Adang Flexure (e.g. Heryanto et al, 1996) or Adang Fault Zone (e.g.…”

Tectonostratigraphic evolution of Cenozoic marginal basin and continental margin successions in the Bone Mountains, Southwest Sulawesi, Indonesia

“…Based on the observation that eastern Kalimantan and Western Sulawesi share Cretaceous and Early Paleogene features, Hamilton (1979) suggested that the two regions were positioned closer together during this time interval. Similarities in basement structure and paleomagnetic data (Haile, 1978;Cloke et al (1999);Guntoro, 1999;Fuller et al 1999) support this hypothesis. Around 120-115 Ma, several continental fragments derived from Gondwana arrived at the subduction zone (Metcalf, 1996;Parkinson et al, 1998).…”

Determination of sedimentary cover and structural trends in the Central Sinai area using gravity and magnetic data analysis

“…4a). The Bouguer anomalies of the deeper sources are characterized by longer wavelength and are smooth over considerable distances, whereas the shallow sources generate sharper anomalies of shorter wavelengths (Cloke et al, 1999). The gravity values are gradually increases in the southern part to more than (2 mGal) and decrease to (À16 mGal) in the north central part of the study area.…”

“…The main boundaries at which density contrast significantly affect the gravity field are: (a) the sediment-water interface; (b) the base of shallow low density sediments, in the range of 1 ± 500 m thickness; (c) major basin structures in the range of 1 ± 10 km; and (d) the Moho at a depth of 10 ± 30 km. Therefore, the reliable interpretation depends on the fact that the underground geology and density contrasts are well known (Cloke et al, 1999;Isık and Senel, 2009). The first anomaly represents a very high gravity anomaly.…”