Petrogenesis and Tectonic Implications of Early Paleozoic Magmatism in Awen Gold District, South Section of the Truong Son Orogenic Belt, Laos
Abstract
:1. Introduction
2. Geological Setting
3. Materials and Methods
3.1. Sample Petrography
3.1.1. Gabbro/Olivine-Basalt
3.1.2. Quartz-Monzonite
3.1.3. Granodiorite
3.1.4. Tonalite
3.2. Zircon Dating
3.3. Major and Trace Elements
3.4. Whole Rock Sr and Nd Isotopes
4. Results
4.1. Zircon U-Pb Ages
4.1.1. Awen Magmatic Complex
4.1.2. Green Pluton
4.2. Major and Trace Elements
4.2.1. Awen Magmatic Complex
4.2.2. Green Pluton
4.3. Whole Rock Sr and Nd Isotopes
5. Geochronological Framework
6. Discussion
6.1. Petrogenesis and Magma Source
6.1.1. Middle Cambrian (~507 Ma) Magmatism
6.1.2. Early Ordovician to Middle Ordovician (483–461 Ma) Magmatism
6.1.3. Late Ordovician to Early Silurian (461–438 Ma) Magmatism
6.1.4. Early Silurian to Late Silurian (438–410 Ma) Magmatism
6.2. Tectonic Setting and Geodynamics
7. Conclusions
- (1)
- Our ages present a new geochronological framework of magmatism along the TSOB in Laos. Four stages (~507 Ma, 483–461 Ma, 461–438 Ma, and 438–410 Ma) of the geodynamic evolution of the TSOB are responsible for the generation of different kinds of magmatic rocks in the Early Paleozoic.
- (2)
- The mafic rocks belong to the potassic series and are mainly generated by the partial melting of the mantle wedge, and the tholeiitic I-type granitoid is derived from the melting of the lower Mesoproterozoic continental crust. Both the gabbro and granitoid have arc signatures were depleted in Nb, Ta, and Ti. These rocks are related to the northward subduction of the Tamky-Phuoc Son Ocean.
- (3)
- The Middle Cambrian (~507 Ma) is the early stage of the bidirectional subduction of the Tamky-Phuoc Son Ocean, with northward subduction beneath the Truong Son terrane and southward subduction beneath the Kontum massif. The Early Ordovician to Middle Ordovician (483–461 Ma) is the main subduction stage of the Tamky-Phuoc Son Ocean, and the Tamky-Phuoc Son Ocean is closed in this stage. The Late Ordovician to Early Silurian (461–438 Ma) is the collision stage of the Tamky-Phuoc Son Ocean and Truong Son terrane. The Early Silurian to Late Silurian (438–410 Ma) is the late stage of collision with the slab roll-back.
Supplementary Materials
Author Contributions
Funding
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Shang, Z.; Chen, Y. Petrogenesis and Tectonic Implications of Early Paleozoic Magmatism in Awen Gold District, South Section of the Truong Son Orogenic Belt, Laos. Minerals 2022, 12, 923. https://doi.org/10.3390/min12080923
Shang Z, Chen Y. Petrogenesis and Tectonic Implications of Early Paleozoic Magmatism in Awen Gold District, South Section of the Truong Son Orogenic Belt, Laos. Minerals. 2022; 12(8):923. https://doi.org/10.3390/min12080923
Chicago/Turabian StyleShang, Zhi, and Yongqing Chen. 2022. "Petrogenesis and Tectonic Implications of Early Paleozoic Magmatism in Awen Gold District, South Section of the Truong Son Orogenic Belt, Laos" Minerals 12, no. 8: 923. https://doi.org/10.3390/min12080923