Rubidiun-strontiuo and potassium-argon age dating of the granitic rocks' of the Malny.n Peninsula show that important episodes of granites .to intrusion occurreddurine late Carboniferous (about 280 m.y), late Permian/early Triassic (abort 25…
In recent years two new classifications of Cale Alkalie granitoids have evolved in the eastern hemisphere and are currently influencing exploration concepts, particularly in SE Asia. This note arises from considerations of their possible appliction to the further exploration of the pre-Quaternary part of Sumatra for which a Regional Geolog~cal an…
The Lassi mass, Southeast of lake singkarak is a complex rock assemblage of permo-Carboniferous volcanics and sediments and Triassic Duringg Permo-Carboniferous volacanic and sediments and Triassic deposits, intruted by plutons and partly overlain by Tertiary sediments. During Permo-Carboniferous time this area was occupied by an elongated sea basin…
Pada umumnya daerah Lebak Raung terdiri dari batuan Biotite-Granite, Granitic - muscovite - gneiss dan muscovite-schist. Batas kontak diantara jenis batuan ini tidak pernah dapat diketahui dengan jelas dan dalam hal penyelidikan ini tidak menapatkan perhatian khusus.kadang-kadang diketemukan intrusi aplitic-granite didalam batuan biotite-granite dan…
The relationship between tin ore deposits and granite magmatism '.Ihe tin belt of S.E. Asia, which is about 3500 km long end 400 to 800 km wide (Figure 1)1 is probably one of the best examples of a metallogenic ,E;:OVince. '.Ihe world's annutl tin produ…