Bulletin of the Geological Society of Malaysia, Volume 20, August 1986, pp. 525 – 535
General Department of Geology, 6 Pham Ngu Lao Str., Hanoi, S.R. Vietnam
Abstract: Located at the southwestern margin of the South China plate, the Hoang Lien Son zone is one of the most important structural and metallogenic units in North Vietnam.
Along this elongated NW-SE zone, extending from the coastline in the southeast, through North Vietnam to the boundary with China in the northwest, are many mafic, ultramafic, alkaline and acid volcanics as well as intrusive rocks. The evidence of the mafic, tectonic, metamorphic and metallogenic activities shows that a subducting plate margin was very active from the Jurassic to the end of the Palaeogene. During that period of time the zone appeared to have been a volcanic arc at the edge of the South China continental plate.
Sulphide mineralization occurs abundantly along this zone, especially that of copper, iron, lead and zinc. Deposits and occurrences of rare earth elements related to alkaline rocks and molybdenum related to granite are also found.