Petrogenesis of Late Triassic Post-Collisional Volcanic Rocks from Loei Zone in Southeastern Thailand and Its Paleotethyan Tectonic Implications
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摘要: 泰国位于东古特提斯构造域的核心位置，保存了多条与古特提斯洋俯冲-碰撞-闭合演化有关的构造岩浆岩带.但目前对于其中黎府带早中生代火山岩的研究仍存在不足，其相关的岩石成因和构造属性未能得到有效限定.因此，针对泰国东南部黎府带出露的晚三叠世火山岩开展了详细的岩相学、锆石U-Pb年代学、地球化学以及Sr-Nd-Hf同位素研究，并结合区域对比综合分析了东古特提斯构造域晚三叠世岩浆活动及其动力学机制.该套样品包括了玄武岩、流纹岩和英安岩，锆石U-Pb定年表明其形成年龄为晚三叠世（204~200 Ma）.其中玄武岩样品具有富铌玄武岩的特征，其对应的（87Sr/86Sr）i =0.703 98~0.704 00，εNd（t）=+5.0~+5.3，εHf（t）=+0.3~+15.5.长英质火山岩样品具有A型特征，且与玄武岩样品具相似的同位素组成，其对应的（87Sr/86Sr）i =0.702 71~0.704 72，εHf（t）=+4.0~+4.2，εNd（t）=+6.8~+16.0.地球化学特征表明该套玄武岩样品来自类似OIB特征的亏损软流圈地幔源区，而长英质火山岩可能来自该套新底侵的基性岩经低程度部分熔融.区域对比表明该套晚三叠世火山岩形成于古特提斯洋碰撞后伸展背景，是东古特提斯洋碰撞闭合后最晚期的岩浆活动.年代学数据对比显示黎府带与清孔-南邦-塔克火山岩带均具有相似的三叠纪年龄谱系，证实了在中-晚三叠世时期黎府带也同样记录了东古特提斯洋碰撞及碰撞后的岩浆作用.Abstract: Thailand is located in the core region of the East Paleotethyan Domain, preserves numerous tectonic-magmatic belts related to the subduction-collision-closure evolution of the Paleotethyan Ocean. However, the study on the Early-Middle Mesozoic volcanic rocks in the Loei zone remains unclear and the related petrogenesis and tectonic setting have not been constrained. Therefore, this study carries out detailed petrographic, zircon U-Pb geochronology, geochemistry and Sr-Nd-Hf isotopic studies on the Late Triassic volcanic rocks along the Loei zone in southeastern Thailand. Our study along with regional comparisins comprehensively analyze the Late Triassic magmatism and geodynamics process in the East Paleotethyan Domain. The study samples include basalts, rhyolites and dacites, with Late Triassic zircon U-Pb ages of 204-200 Ma. The basalts exhibit characteristics of Nb-enriched basalts, with (87Sr/86Sr)i=0.703 98-0.704 00, εNd(t)=+5.0 - +5.3, εHf(t)=+0.3 - +15.5. The felsic volcanic samples exhibit A-type characteristics and share similar isotopic compositions with the basalt samples, with (87Sr/86Sr)i = 0.702 71-0.704 72, εNd(t)=+4.0 - +4.2, εHf(t)=+6.8 - +16.0. Geochemical characteristics indicate that these basalts originated from a depleted OIB-like asthenospheric mantle source, while the felsic volcanic rocks possibly originated from the low level partial melting of these newly underplated mafic rocks. Regional comparisons indicate that these Late Triassic volcanic rocks were formed in a post-collisional extensional setting, representing the latest magmatism after the collision and closure of the East Paleotethyan Ocean. Comparison of chronological data shows that the Loei zone and the Chiang Khong-Lampang-Tak zones share similar Triassic age-spectra pattern, confirming that the Loei zone also recorded the collisional and post-collisional magmatism related to the Eastern Paleotethyan evolution during the Middle-Late Triassic.
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Key words:
- southeastern Thailand /
- Loei zone /
- Late Triassic /
- post-collisional magmatism /
- East Paleotethyan Ocean /
- petrology /
- tectonic
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图 1 东南亚地区区域构造图(a)和研究区地质简图(b)
图a据Wang et al.（2018）；余永琪等（2024）；图b据Qian et al.（2022）
Fig. 1. Regional tectonic framework (a) and simplified geological map of study area (b)
图 2 泰国东南部黎府带火山岩野外露头(a~c)和正交偏光镜下显微岩相学特征(d~f)
矿物缩写：Pl. 斜长石；Qtz. 石英；Cpx. 辉石；Chl. 绿泥石
Fig. 2. Field photo (a-c) and photomicrographs (d-f) for the volcanic rocks in the Loei zone of SE Thailand
图 3 泰国东南部黎府带火山岩锆石U-Pb年龄谐和图(a~e)和锆石年龄-εHf(t)图解(f)
Fig. 3. U-Pb concordia diagrams (a-e) and plot of age (Ma) vs. εHf(t) for zircon grains (f) from the volcanic rocks in the Loei zone of SE Thailand
图 4 泰国东南部黎府带火山岩图解
a. TAS，据Le Maitre et al.（1989）；b. Co-Th，据Hastie et al.（2007）；c. Nb-Nb/U，据Kepezhinskas et al.（1996）；d. Zr+Nb+Ce+Y-（K2O+Na2O）/CaO；e. Nb-Y-Ga
Fig. 4. Diagrams for the volcanic rocks in the Loei zone of SE Thailand
图 5 泰国东南部黎府带火山岩球粒陨石标准化稀土元素配分曲线(a、c)和原始地幔标准化微量元素蛛网图(b、d)
背景数据引自Qian et al.（2017a）；Nualkhao et al.（2018）；Shi et al.（2019，2021）；Uchida et al.（2022，
2023） ；球粒陨石和原始地幔标准化数据引自Sun and McDonough（1989）Fig. 5. Primitive mantlenormalized spidergram (a, c) and Chondritenormalized REE pattern (b, d) for the volcanic rocks in the Loei zone of SE Thailand
图 6 泰国东南部黎府带火山岩Sr-Nd同位素图解
底图据Zi et al.（2012）；Qian et al.（2021）；背景数据来自Qian et al.（2016a，2016b，2017a，2020）；Wang et al.（2018）；Uchida et al.（2022，2023）及其参考文献
Fig. 6. Plot of Sr vs. Nd isotopic data for the volcanic rocks in the Loei zone of SE Thailand
图 7 泰国东南部黎府带火山岩La-La/Sm (a)、Mg#-CaO/Al2O3 (b)、Zr-Th/Ta (c)、Rb/Sr-Rb/Ba(d)和部分熔融程度(e)模拟图解
图c据Liu et al.（2021）；图d据Sylvester（1998）
Fig. 7. Plots of La-La/Sm (a), Mg#-CaO/Al2O3 (b), Zr-Th/Ta (c), Rb/Sr-Rb/Ba (d) and partial melting degree simulation (e) for the volcanic rocks in the Loei zone of SE Thailand
图 8 黎府带及其邻区火成岩年龄分布图(a)和年龄频谱图(b)
年代学数据来自Barr et al.（2000，2006）；Srichan et al.（2009）；Qian et al.（2013，2015，2016a，2016b，2017a，2021，2022）；Kamvong et al.（2014）；Salam et al.（2014）；Arboit et al.（2016）；Fanka et al.（2016，2018）；Yang et al.（2016）；Shi et al.（2019，2021）；Wang et al.（2020），Nualkhao et al.（2018）；Uchida et al.（2022，2023）和本研究
Fig. 8. The distribution (a) and spectrogram (b) of formation ages for the igneous rocks along the Loei zone and surrounding areas
图 9 泰国东南部黎府带火山岩构造环境判别图
图a据Meschede（1986）；图b据Pearce et al.（1996）
Fig. 9. Tectonic discrimination diagrams for the volcanic rocks in the Loei zone of SE Thailand
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