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WU Hao, ZHAI Qingguo, HU Peiyuan, TANG Yue, ZHU Zhicai, WANG Wei, XIE Chaoming, QIANGBA Zhaxi. 2021. Early Cretaceous volcanic rocks in northern Baingoin, Tibet: Magmatic record of the closure of the Bangong-Nujiang Ocean[J]. Geology in China, 48(5): 1623-1638. doi: 10.12029/gc20210522
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Early Cretaceous volcanic rocks in northern Baingoin, Tibet: Magmatic record of the closure of the Bangong-Nujiang Ocean
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Abstract
The petrological, zircon U-Pb dating, whole-rock geochemical, and zircon Hf isotopic data of the Early Cretaceous andesites and dacites in the Maqianxiang area of Baingoin County, Tibet, are reported. The zircon U-Pb ages of andesite are (108.0±1.5)Ma and (113.6±0.9) Ma, and those of dacite are (106.7±1.9) Ma and (113.6±0.8) Ma. The andesites are enriched in Th and U and depleted in Nb, Ta, and Ti, have variable Mg# values (25-63), and show mainly negative zircon εHf(t) values (-8.6 to +1.5). They are probably generated by mixing of mantle- and crust-derived melts. Dacite shares similar trace element features with the coeval andesite, and has negative zircon εHf(t) values (-12.3 to -8.1). It is interpreted as a product of partially melting crust. The andesite and dacite are interpreted as a product of the ca.110 Ma magmatism along the Bangong-Nujiang suture zone, and may be related to the continent-continent collision process after the closure of the Bangong-Nujiang Ocean.
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References
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WU Hao, ZHAI Qingguo, HU Peiyuan, TANG Yue, ZHU Zhicai, WANG Wei, XIE Chaoming, QIANGBA Zhaxi. 2021. Early Cretaceous volcanic rocks in northern Baingoin, Tibet: Magmatic record of the closure of the Bangong-Nujiang Ocean[J]. Geology in China, 48(5): 1623-1638. doi: 10.12029/gc20210522
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Figure 1.
Tectonic framework of the Tibetan Plateau (a, after Hu et al., 2017) and simplified geological map (b) of Maqian Town, Baingoin County
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Figure 2.
Field photographs and microphotographs of the volcanic rocks in Maqian Town of Baingoin County, Tibet
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Figure 3.
LA-ICP-MS zircon U-Pb concordant diagrams of the andesite (a, b) and dacite (c, d) in Maqian Town of Baingoin County, Tibet (The scale bar on the CL images representing 100 μm)
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Figure 4.
Zr/TiO2*0.0001-SiO2(a) and Co-Th diagrams (b) of the volcanic rocks in Maqian Town of Baingoin County, Tibet
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Figure 5.
Primitive-mantle-normalized trace elements spidergrams and Chondrite-normalized rare-earth element patterns of the andesite (a, b) and dacites (c, d) in Maqian Town of Baingoin County, Tibet (Normalizing and upper crust data from reference, after Sun and McDonough, 1989)
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Figure 6.
Plots of εHf(t) vs. U-Pb ages of the volcanic rocks in Maqian Town of Baingoin County, Tibet
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Figure 7.
MgO-TFeO (a) and La-La/Sm diagrams (b) (after Zorpi et al., 1989) and La-La/Sm diagrams (after Schiano et al., 2010) of the volcanic rocks in Maqian Town of Baingoin County, Tibet