Metaigneous rocks from Gampola and Nuwara Eliya belong to the Highland Complex of Sri Lanka. Rb-Sr and Sm-Nd age data and initial Sr and Nd isotopic ratios document several geological events. (1) Separation of crustal material began in the late Archean. (2) Partial melting of crust took place on a large scale at ca. 2400 Ma, leaving metaigneous rocks as restite after extraction of felsic magmas. (3) High-grade metamorphism related to the Pan-African orogeny occurred at 520 Ma. (4) Partial melting of crustal material proceeded on a local scale at 490 Ma-480 Ma, producing slight disturbance to the Rb-Sr whole-rock system.
|Number of pages||6|
|Journal||Proceedings of the Japan Academy Series B: Physical and Biological Sciences|
|Publication status||Published - Jan 1 1995|
All Science Journal Classification (ASJC) codes
- Agricultural and Biological Sciences(all)
- Physics and Astronomy(all)