Paleomagnetic study on orogenic belt: An example from Early Cretaceous volcanic rocks,Inner Mongolia,China |
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Authors: | Ren?Shoumai Email author" target="_blank">Zhu?Rixiang?Email author Huang?Baochun Zhang?Fuqin Wang?Hongqiang |
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Institution: | 1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Strategic Research Center for Oil and Natural Gas, The Ministry of Land and Resources of China, Beijing 100034, China 2. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China |
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Abstract: | We report paleomagnetic results for Early Cretaceous lava flows collected from the Suhongtu area of Inner Mongolia, the middle
part of the Tianshan-Mongolia Fold Belt (TMFB). Rock-magnetic experiments for different lava flows indicate that the main
magnetic mineral is pseudo-single-domain (PSD) magnetite. The characteristic high-temperature remanence component is isolated
by thermal demagnetization temperature steps between 300°C and 585°C, which yields a mean direction of D = 23.6°, I = 56.0° with α 95 = 2.3°. We interpret this high-temperature remanence component as primary magnetization based mainly upon
the petrographic analysis, which shows that the shape of magnetite crystal is relatively rounded square or polygon without
internal reflection and deuterogenous phenomenon. The corresponding pole of the high-temperature remanence component is at
71.1°N, 200.5°E with A
95 = 2.7°. This Early Cretaceous pole is in good agreement with those for Siberia, North China, and Inner Mongolia, suggesting
that these continental blocks had already sutured together in the Early Cretaceous, which would further provide constraints
on better understanding of the formation and evolution of the TMFB. |
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Keywords: | orogenic belt paleomagnetism Suhongtu of Inner Mongolia Eurasia |
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