Previous investigations of plutons in Sumatra were focused on age dating with minimum
geochemistry composition analysis. The purpose of this study is to define the geochemistry …

Internal reference materials are generated by laboratories to overcome the high cost and
limited matrix of certified reference materials (CRM). Rare earth elements (REE) are …

ABSTRAK Penambangan timah di Asia Tenggara yang kaitannya dengan sabuk timah telah
dimulai sejak abad ke-19. Eksploitasi tersebut tentu telah meninggalkan beberapa lokasi …

Batugamping merupakan batuan karbonat laut dangkal yang banyak terdapat di Pulau
Sumatra. Studi sebelumya mengenai batugamping di Pulau Sumatra lebih terfokus kepada …

This work presents microscopic-, whole-rock geochemical-, and K-Ar age data for Tanjung
Berikat Granitoid at the easternmost part of Bangka Island. Some selected samples are in …

Weathering could stimulate the formation of several economic deposits such as bauxite,
ferrite, nickel, manganese, and ion-adsorption type REE. Lingga Regency is situated near …

The weathering process occurs on the Earth's surface, especially in tropical climates, and
causes the parent rock's mobilization of elements. Weathering is interesting because it is …

Granitoid intrusion of several provinces on Sumatra is correlated with Southeast Asia
tectonics that have occurred since the Permian. Granites from several volcanic arc provinces …

Monazite mineral contains a sufficient composition of rare earth elements which are
currently required widely in modern industries. Reference materials are needed to validate …

Granitic rocks are widely distributed in Sumatra and surrounding areas. These granitoids are
classified into several granite provinces of Southeast Asia with different intrusion processes …