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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 |
| UTAS Author: | Kamvong, T (Mr Teera Kamvong) |
| UTAS Author: | Zaw, K (Professor Khin Zaw) |
| UTAS Author: | Meffre, S (Dr Sebastien Meffre) |
| UTAS Author: | Lai, C-K (Dr Chun Lai) |
| ID Code: | 92466 |
| Year Published: | 2014 (online first 2013) |
| Web of Science® Times Cited: | 59 |
| 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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