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Paleomagnetic constraints on the tectonic relationship between the Alashan/Hexi Corridor Terrane and the North China Block
Author(s) -
Huang B. C.,
Otofuji Y.,
Yang Z. Y.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900097
Subject(s) - terrane , paleomagnetism , geology , paleozoic , ordovician , paleontology , devonian , tectonics , fold (higher order function) , seismology , mechanical engineering , engineering
We report paleomagnetic results for Early‐Middle Ordovician limestone rocks from the eastern part of the Hexi Corridor, northwest China. The characteristic high temperature component B isolated from 74 out of 114 samples exhibited dual polarity and passed the fold and reversal tests at the 95% confidence level. The corresponding paleopole, at 326.5°E, 31.8°N with A95=9.5°, is in agreement with the coeval poles from the stable North China Block (NCB). It implies that the Alashan/Hexi Corridor (AHC) terrane was part of the NCB since the Early‐Middle Ordovician, which is consistent with geological evidence. The Silurian and Devonian paleomagnetic results from the AHC terrane may therefore be used to discuss the middle Paleozoic tectonic displacement and paleogeographic reconstruction of the NCB.