Geology and sulfur isotope implications of Bawdwin deposit, Northern Shan State, Myanmar: An Ag-rich, volcanic-hosted, polymetallic massive sulphide deposit

摘要

The Bawdwin deposit is located in Namtu township, Northern Shan State, Myanmar. The deposit occurs as sub-vertical pipes in a rhyolitic volcaniclastic pile of Cambrian age. The orebodies were localised along N-S and NW-SE major rift structure in which dome-shaped rhyolite intrusions were emplaced. The present geological and mineralogical characteristics of the Bawdwin deposit are comparable to those of other polymetallic VHMS-style deposits. The restricted δ~(34)S values of 1.0-3.9 %o imply that the sulphur in the Bawdwin deposit has a strong magmatic connection.