Abstract

An attempt has been made to explain the nature of tin enrichment within the region of Burmese-Malayan Peninsula. The geological evolution of the region and the controlling factors of tin enrichment are reviewed according to the context of plate tectonics. The proposed [late tectonics model has tentatively outlined temporal and spatial relationship between the mineralization and tectonic environment as : 1.) Pre-concentration of tin occurred in the lower continental crust during rifting stage in middle Palaeozoic times when the independent Burmese-Malayan block had been formed., 2.) Repeated magmatism on the eastern margin of the block brought tin from the lower crust to the upper level. Eventually, the development of back-arc extensional tectonics during pre-Late Triassic times may strengthened degree of tin enrichment and mineralization by adding mantle-derived tin., 3.) Reworking of continental type basement during Late Triassic orogeny gave rise to mineralization of tin in the collision-related granitic rocks., 4.) Partial melting of lower crust as related to easterly-dipping subduction in Jurassic-Cretaceous times may responsible for the emplacement of tin-bearing plutons in the western coast of the Peninsula., and 5.) Back-arc extensional tectonics in Early Tertiary and perhaps younger periods can give rise to tin mineralization.

 

We have 99 guests and no members online