Citation: | YAN Songtao, WU Qingsong, LI Hu, QIN Meng, MAO Shidong, LI Yusheng, ZHANG Yong. 2021. Material composition and oceanic basin evolution process of the Litang mélange in the middle part of the Ganzi-Litang ophiolite mélange belt[J]. Geology in China, 48(6): 1875-1895. doi: 10.12029/gc20210617 |
The Litang mélange, in which conserves complete mélange system is developed, including remnant of ophiolite, oceanic island blocks, intra-oceanic arc blocks, flysch formation, remnant of rift, high-ultrahigh pressure belt, is located in the middle part of the Ganzi-Litang ophiolite mélange belt around Xinlong-Litang county town, and is an ideal object for the restoring and inversing of the evolution of the Ganzi-Litang ocean basin. On the basis of previous studies and combined with recent research results, the mineral composition, tectonic environment and formation age of Litang melange are described in detail, which further constrain the space-time, nature and evolution of Ganzi-Litang ocean basin. The results of LA-ICP-MS zircon U-Pb dating show that the age of ophiolite is (346±17)Ma, (286.2±5.1)Ma, (219.5±2.2)Ma, (216.1±2.3)Ma, the age of oceanic island is (271±10)Ma, (245.1±1.5)Ma, (211.8±1.8)Ma, and the latest age of detrital zircon is (196±3)Ma in the siltstone interlayer of Ruihuanshan Formation in Jurassic. Combined with a large number of fossil identification results, the analysis shows that the age of the Litang mélange probably ranges from the Middle Devonian to the Early Cretaceous, indicating that it records the continuous evolution of Ganzi-Litang ocean basin from the Middle Devonian to early Cretaceous. With all the achievement mentioned above, the formation and evolution mode of the Ganzi-Litang ocean basin from the Late Paleozoic to the Mesozoic is approximately established.
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Geotectonic location map of the study area (a, after Pan Guitang et al., 2013) and geological map of the Litang area in the west Sichuan(b)
Geological section of Litang ophiolite of the Xiaba area in Litang County, Sichuan Province
Geological characteristics of ophiolite from the Litang mélange
Cathodoluminescence images and U-Pb concordant ages of zirzons from Luexigou ophiolite
Geological characteristics of oceanic island from the Litang mélange
Chondrite-normalized REE patterns and primitive mantle-normalized trace multi-element patterns of oceanic island basic volcanic rock
Geological characteristics of flysch formation from the Litang mélange
Photomicrograph of the rifting rock from Juewu Town in the Litang area (orthogonal polarization; a, b)
Tectonic discrimination diagrams for metamorphic basic volcanics from Juewu Town in the Litang area
Photograph and photomicrograph of the garnet amphibolite schist in Qukailongwa of Litang (orthogonal polarization)
The formation and evolution mode of the Litang mélange(modified from Pan Guitang et al., 2013)