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Paleomagnetic study on orogenic belt:An example from Early Cretaceous volcanic rocks,Inner Mongolia,China

Science China Earth sciences 2004年第12期47卷 1127-1133页

作者： ren shoumai 1,2.,{2.,{2.,zhang fuqin 1 & wang hongqiang 1 1.institute of geology and geophysics,chinese academy of sciences,beijing 10002.,China 2.Strategic Research Center for Oil and Natural Gas,The Ministry of Land and Resources of China,beijing 100034,China 1. Strategic Research Center for Oil and Natural Gas The Ministry of Land and Resources of China 100034 Beijing China 2. chinese academy of sciences Institute of Geology and Geophysics 100029 Beijing China

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 com- ponent is isolated by thermal demagnetization temperature steps between 300°C and 585"C, which yields a mean direction of D = 2..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 correspond- ing pole of the high-temperature remanence component is at 71.1°N, 2.0.5°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.

关键词： orogenic belt, paleomagnetism, Suhongtu of Inner Mongolia, Eurasia.

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Paleomagnetic study on orogenic belt:An example from Early Cretaceous volcanic rocks,Inner Mongolia,China

Paleomagnetic study on orogenic belt:An example from Early C...

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中国科学院地质与地球物理研究所2.04学术年会

作者： ren shoumai~(1,{2.,{{2. rixiang~1,{2. baochun~1,zhang fuqin~1 & wang hongqiang~1 1.institute of {12. and {1{2.,chinese academy of sciences,beijing 10002.,China {2.Strategic Research Center for Oil and Natural Gas,The Ministry of Land and Resources of China,beijing 100034,China

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) *** characteristic high-temperature remanence component is isolated by thermal demagnetization temperature steps between 300℃and 585℃, which yields a mean direction of D=2..6°,I=56.0°withα=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,2.0.5°E with A=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.

关键词： orogenic belt paleomagnetism Suhongtu of Inner Mongolia Eurasia

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