| Citation: |
Mei-feng Shi, Bao-ci Xu, Zhen-bo Wu, Shu-sheng Liu, Gerrit Pieter Goosen, Zhi-min Peng, Fei Nie, Hui-min Liang, 2021. Geochronology and petrogeochemistry of Late Permian volcanic rocks in the B.Xiengnou area, Northwestern Laos: Petrogenesis and tectonic significance, China Geology, 4, 630-643. doi: 10.31035/cg2021005
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Geochronology and petrogeochemistry of Late Permian volcanic rocks in the B.Xiengnou area, Northwestern Laos: Petrogenesis and tectonic significance
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Abstract
The Nan Suture and Sukhothai Arc Terrane are products of the eastward subduction of the Paleotethyan Ocean during the Late Carboniferous to Triassic. However, their footprints in northwestern Laos are poorly constrained. New geochronological and geochemical data presented in this study demonstrate a Late Permian origin for the andesitic rocks in the B.Xiengnou area rather than Late Triassic. The breccia-bearing andesitic tuff in the B.On ultramafic complex yield a zircon U-Pb age of 260 ± 1.4 Ma, geochemically displaying a MORB-like signature. The andesitic tuff in the B.Kiophoulan-B.Houayhak belt gave the U-Pb age of 254 ± 1.3 Ma, with arc-like geochemical affinity. By combining geochronological and geochemical data from the Nan Suture and Sukhothai Arc Terrane, the authors suggest that the andesitic rocks in the B.On ultramafic complex formed in a back-arc basin background, which connected the Jinghong and Nan back-arc basin during the Permian; while the andesitic tuff in the B.Kiophoulan-B.Houayhak belt erupted in the Sukhothai continental arc setting.
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Keywords:
- Geochronology /
- Zircon U-Pb age /
- Petrogeochemistry /
- Tethyan evolution /
- Nan Suture /
- Sukhothai Arc /
- Geological survey engineering /
- Laos
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References
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Mei-feng Shi, Bao-ci Xu, Zhen-bo Wu, Shu-sheng Liu, Gerrit Pieter Goosen, Zhi-min Peng, Fei Nie, Hui-min Liang, 2021. Geochronology and petrogeochemistry of Late Permian volcanic rocks in the B.Xiengnou area, Northwestern Laos: Petrogenesis and tectonic significance, China Geology, 4, 630-643. doi: 10.31035/cg2021005
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Figure 1.
Tectonic subdivision of Indochina block and distribution of the volcanic belts in NW Laos and eastern Thailand (modified from Wu ZB et al., 2017; Shi MF et al., 2019; Hara H et al., 2020). 1–Sukhothai Arc Terrane; 2–Indochina Block; 3–Ultramafic rocks; 4–Volcanic rocks; 5–Strike-slip fault: RRF, Red River Fault; DBPF, Dien Bien Phu Fault; MPF, Mae Ping Fault; 6–Sutures: ① Changning-Menglian-Chiang Mai-Inthanon suture, ② Jinshajiang-Ailaoshan-Song Ma suture, ③ Tam Ky suture; 7–Tarrane boundary; 8–Speculated Tarrane boundary.
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Figure 2.
Simplified geological map of the B.Xiengnou area in NW Laos (modified from Wu ZB et al., 2017). F1–Khop fault, F2–B.Houaygneng fault, F3–B.Pakkhop fault, F4–B.On fault, F5–Pakpet-Nua fault, F6–Mokkalangkou fault.
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Figure 3.
Field and microscopy photographs of volcanic rocks in the B.Xiengnou area. a, b, e –andesitic tuff in the B.Kiophoulan-B.Houayhak zone; c, d and f –breccia-bearing andesitic tuff in the B.On village. Pl–plagioclase, Qtz–quartz.
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Figure 4.
Representative CL images (a, b) and LA-ICP-MS zircon U-Pb concordia diagrams (c, d) of volcanic rocks in the B.Xiengnou area.
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Figure 5.
Nb/Y vs. Zr/TiO2 (a) (Winchester JA and Floyd PA, 1977) and Th vs. Co classifications (b) (Hastie AR et al., 2007) of volcanic rocks in the B.Xiengnou area. CA–calc-alkaline; H-K–high-K calc-alcaline; SHO–shoshonite; IAT–island-arc tholeiite; B–basalt; BA/A–basaltic andesite and andesite; D/R*–dacite and rhyolite (* indicates that latites and trachytes also fall in the D/R fields).
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Figure 6.
Chondrite-normalized REE patterns (a) and primitive mantle-normalized trace element spidergrams (b) of volcanic rocks in the B.Xiengnou area. The OIB, E-MORB, N-MORB, normalized values for chondrite and primitive mantle are from Sun WD and McDonough WF (1989).
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Figure 7.
Ti/100 vs. Zr vs. Y×3 (a) (Pearce JA and Cann JR, 1973) and Zr vs. TiO2 (b) (Winchester JA and Floyd PA, 1977) tectonic discramination plots of volcanic rocks in the B.Xiengnou area. MORB–mid-ocean ridge basalt; VAB–volcanic-arc basalt; WPB–within-plate basalt.