Petrology of the Cretaceous magmatic rocks from Meratus Range, southeast Kalimantan

A record of continental collision and regional sediment flux for the Cretaceous and Palaeogene core of SE Asia: implications for early Cenozoic palaeogeography

“…Unconformably overlying the Balangbaru Formation in the Bantimala region of South Sulawesi is the Bua Formation (Sukamto 1982;Yuwono et al 1988). This is predominantly volcanic (andesitic) and intrusive rocks with K-Ar ages that range from 65 to 58 Ma (Yuwono et al 1988). In the Biru region, further east, slightly younger (Eocene) volcanic rocks, called the Langi Volcanics (van Leeuwen 1981;Sukamto 1982), comprise predominantly andesitic lithologies.…”

“…In SE Borneo there are andesitic lavas, tuffs and volcanic breccias that were assigned entirely to the Haruyan Formation by Wakita et al (1998) or placed within the Alino Group by Sikumbang & Heryanto (1994) and Yuwono et al (1988) that are interpreted to represent a volcanic arc suite. These lithologies are approximately Late Aptian to Cenomanian in age (115-93.5 Ma) (Yuwono et al 1988;Wakita et al 1998).…”

“…In southern Sulawesi the Balangbaru (Turonian to Maastrichtian turbidite fan ;Hasan 1990) and Marada (Campanian to Maastrichtian turbidites; van Leeuwen 1981) Formations contain volcanic lithic fragments and are, in places, associated with volcanic sills. Unconformably overlying the Balangbaru Formation in the Bantimala region of South Sulawesi is the Bua Formation (Sukamto 1982;Yuwono et al 1988). This is predominantly volcanic (andesitic) and intrusive rocks with K-Ar ages that range from 65 to 58 Ma (Yuwono et al 1988).…”

“…These lithologies are approximately Late Aptian to Cenomanian in age (115-93.5 Ma) (Yuwono et al 1988;Wakita et al 1998). Overlying the Alino Group is the Manunggul Group (Sikumbang & Heryanto 1994) or Formation (Yuwono et al 1988), which comprises volcanogenic extrusive rocks that are intruded by basaltic to dacitic dykes and gabbroic to granitic stocks with K-Ar ages that range from 87 AE 4 Ma to 72 AE 4 Ma, interpreted by Yuwono et al (1988) to be subduction-related, based on their chemistry.…”

Subsidence and uplift by slab-related mantle dynamics: a driving mechanism for the Late Cretaceous and Cenozoic evolution of continental SE Asia?

“…Rosidi et al 1976). In SE Borneo there are andesitic lavas, tuffs and volcanic breccias that are assigned entirely to the Haruyan Formation by Wakita et al (1998) or placed within the Alino Group by Sikumbang & Heryanto (1994) and Yuwono et al (1988) that are interpreted to represent a volcanic arc suite. These lithologies are approximately Late Aptian to Cenomanian in age (115 -93.5 Ma) (Yuwono et al 1988;Wakita et al 1998).…”