Paleomagnetism of early Triassic Daye Formation and its tectonic implications |
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Authors: | Zhongyue Shen Dajun Fang Penyang Wang Xiaodong Tan Zhaolian Wang |
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Institution: | (1) Department of Earth Sciences, Zhejiang University, 310027 Hangzhou, China;(2) Daqing Petroleum Institute, 163000 Daqing, China |
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Abstract: | The new paleomagnetic data of the early Triassic Daye Formation from Hubei Province are reported. The ChRM passes consistency
test and reversal test. Two magnetic components were isolated with principal component analysis (PCA). Component B is a ChRM
and component A was acquired by remagnetization during Indosinian cycle. Rock magnetic study shows that the carrier is dominantly
detrital magnetite. According to the data, in conjunction with recently published Triassic paleomagnetic results, mean paleopole
of the Triassic Yangtze Block is calculated as 30.3°N, 198.4°E, α95 = 9.2°. Distribution of all Triassic declinations indicates obviously local rotation in the mid-Yangtze areas, which results
in consistence of the declinations with fold axes. By comparison with Triassic paleomagnetic data in the South China Block
and some of geological evidence, it is inferred that the timing of the suture between the Yangtze Block and the South China
Block is earlier in western part than in eastern part in the Indosinian period. |
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Keywords: | Yangtze Block Triassic paleomagnetism collision orogeny |
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