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Adakites in the Truong Son and Loei fold belts, Thailand and Laos: Genesis and implications for geodynamics and metallogeny

Citation

Kamvong, T and Zaw, K and Meffre, S and Maas, R and Stein, H and Lai, C-K, Adakites in the Truong Son and Loei fold belts, Thailand and Laos: Genesis and implications for geodynamics and metallogeny, Gondwana Research, 26, (1) pp. 165-184. ISSN 1342-937X (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier

DOI: doi:10.1016/j.gr.2013.06.011

Abstract

LA-ICP-MS U-Pb zircon dating reveals that the Phu Kham adakites in the Truong Son Belt were emplaced during the Late Carboniferous (ca. 306 to 304 Ma), whereas the Puthep 1 (PUT 1) adakites in the Loei Fold Belt were formed during the Middle Triassic (ca. 244 to 241 Ma). These rock formation ages are largely coeval to Re-Os molybdenite ages (Phu Kham: ca. 304 Ma; PUT 1: ca. 246 Ma), suggesting close temporal links between adakite formation and copper-gold mineralization. New geochemical results show that the Phu Kham and PUT 1 adakites are characterized by low HREE and Y contents, but elevated LREE, Sr, Sr/Y, and La/Yb values. In addition, the two adakites have relatively high 143Nd/144Nd ratios (0.512648 to 0.512719), Mg# (Phu Kham: 37-68; PUT 1: 40-65), and Cr and Ni contents. These results are best interpreted as representing slab melts that have interacted with supra-subduction zone mantle wedge during ascent. Tectonically, the Phu Kham and PUT 1 adakites were most likely formed during the initiation of subduction of the Ailaoshan-Song Ma and the Main Paleo-Tethys ocean plates respectively. Close temporal relations between the adakite formation and the copper-gold mineralization suggest strong genetic links between the two in the mainland SE Asia region.

Item Details

Item Type:Refereed Article
Keywords:adakites, Truong Son and Loei fold belts, copper–gold mineralization, Paleo-Tethys, SE Asia
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration Geochemistry
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Titanium Minerals, Zircon, and Rare Earth Metal Ore (e.g. Monazite) Exploration
Author:Kamvong, T (Mr Teera Kamvong)
Author:Zaw, K (Professor Khin Zaw)
Author:Meffre, S (Dr Sebastien Meffre)
Author:Lai, C-K (Dr Chun Lai)
ID Code:92466
Year Published:2014 (online first 2013)
Web of Science® Times Cited:37
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2014-06-18
Last Modified:2017-11-02
Downloads:0

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