Citation: | LIU Yongzheng, ZHANG Haiping, ZHANG Yongqing, HE Hongyun, XU Mingchi, JIAO Jiangang. 2023. Zircon U–Pb Age and Tectonic Setting of the Manitu Formation in the Middle–East Inner Mongolia, China. Northwestern Geology, 56(2): 46-60. doi: 10.12401/j.nwg.2023001 |
The Manitu Formation widely occurs in the middle–east Inner Mongolia Autonomous region, and was thought to be formed in the late Jurassic together with the regional Manketouebo Formation and the Baiyingaolao Formation. However, the Nestoriapissovi fossils in the andesite interlayer of the Manitu Formation indicate this formation was formed during the Jibei Stage of the early cretaceous by previous studies. In addition, the zircon U–Pb ages for the volcanic rocks in the Manitu Formation have a wide range, and the tectonic setting is still under debate. Therefore, this study carried out the analyses of zircon U–Pb dating and whole–rock compositions to examine the age and tectonic setting of the Manitu Formation. The zircon U–Pb ages for three samples collected from Zarutqi–Bahrainyouqi are 142.4±1.4Ma, 130.0±1.4Ma and 145.0±1.5Ma, respectively, suggesting the Manitu Formation in the Zarutqi–Bahrainyouqi area were formed in the early Cretaceous. Rocks from the Manitu Formation have SiO2, Al2O3, K2O and Na2O of 59.43%~64.73%, 15.66%~17.19%, 2.56%~5.03%, 3.59%~4.53%, respectively, with ALK of 6.36%~9.56%. They have high concentration of LILE and LREE, and depletion of Nb, Sr, P and Ti. Total rare earth element (ΣREE) concentration ranges from 118.71×10–6 to 189.99×10–6, and LREE and HREE are highly fractionated with (La/Yb)N of 8.88~9.58, with negative Eu anomalies (δEu=0.66~0.95), showing an island arc–like geochemistry. We propose that the formation age becomes younger from the west to east of the Great Xing’an Mountain based on the comparison of ages of rocks from the west, middle and east segment, and this may ascribed to the closure of the Mongol–Okhotsk ocean and the subsequent post–collision extension.
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Regional geological sketch map and sampling positions in the middle–south part of the Daxinganling region
Photomircrography of the volcanic rocks of the Manitu Formation in the middle–south part of the Daxinganling region
Zircon CL images and analyzed points for the LA–ICP–MS measurements from the samples of the Manitu Formation
LA–ICP–MS U–Pb concordia diagram and weighted average age of zircon grains from Manitu Formation
(a) (K2O+Na2O) versus SiO2 diagram and (b) K2O versus SiO2 diagram for samples from the Manitu Formation
(a) Primitive mantle normalized trace element spider diagrams and (b) chondrite–normalized rare–earth element patterns for rhyolite from the Manitu Formation
Tectonic discrimination diagrams of the samples from the Manitu Formation