The Ban Houayxai epithermal Au-Ag deposit in the Northern Lao PDR: mineralization related to the Early Permian arc magmatism of the Truong Son Fold Belt

Manaka, Takayuki, Zaw, Khin, Meffre, Sebastien, Vasconcelos, Paulo, Golding, Sue and Cairns, Cameron (2014) The Ban Houayxai epithermal Au-Ag deposit in the Northern Lao PDR: mineralization related to the Early Permian arc magmatism of the Truong Son Fold Belt. Gondwana Research, 26 1: 185-197. doi:10.1016/j.gr.2013.08.024

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Author Manaka, Takayuki
Zaw, Khin
Meffre, Sebastien
Vasconcelos, Paulo
Golding, Sue
Cairns, Cameron
Title The Ban Houayxai epithermal Au-Ag deposit in the Northern Lao PDR: mineralization related to the Early Permian arc magmatism of the Truong Son Fold Belt
Journal name Gondwana Research   Check publisher's open access policy
ISSN 1342-937X
Publication date 2014-07-01
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.gr.2013.08.024
Open Access Status Not Open Access
Volume 26
Issue 1
Start page 185
End page 197
Total pages 13
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Formatted abstract
Highlights
• The Ban Houayxai Au–Ag deposit is hosted in volcanic rocks of ca. 290–280 Ma.
• The deposit was formed in Early Permian Truong Son magmatic arc.
• It is one of the oldest epithermal systems in SE Asia.

The Ban Houayxai Au–Ag deposit is located in the Truong Son Fold Belt in the northern Lao PDR, mainland SE Asia. The deposit is hosted within an Early Permian volcano-sedimentary unit which is a part of a Late Carboniferous–Early Permian (310–270 Ma) volcanic–plutonic sequence of the Truong Son Fold Belt. The main Au–Ag mineralization stages (i.e., Stages 2 and 3) at Ban Houayxai consist of hydrothermal veins/breccias associated with a carbonate–quartz–sulfides (pyrite–sphalerite–galena–chalcopyrite)–sericite–chlorite–electrum–native silver–stephanite mineral assemblage. Geochronological studies from LA-ICP-MS zircon U–Pb and adularia Ar–Ar and K–Ar dating identified Early Permian, Cretaceous and Eocene ages. The Early Permian age is related to the emplacement of the mineralized volcanic arc sequence, whereas the Cretaceous and Eocene ages represent resetting probably related to Yanshanian and/or Himalayan Orogenies. A regional tectonic reconstruction indicates that the Au–Ag epithermal deposit at Ban Houayxai was formed as a result of southward subduction of an oceanic crust attached to the South China Terrane beneath the Indochina Terrane during the Early Permian. From the metallogenic point of view, the recognition of the old epithermal system at Ban Houayxai implies that the Truong Son Fold Belt possesses high potential for the presence of deeper magmatic-related deposits such as porphyry and porphyry-related skarn deposits.
Keyword Early Permian
Epithermal Au–Ag
Truong Son Fold Belt
Ban Houayxai
Lao PDR
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 7 October 2013.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2014 Collection
School of Earth Sciences Papers
 
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Created: Wed, 18 Dec 2013, 20:33:27 EST by Ashleigh Paroz on behalf of School of Earth Sciences