Authors
David AD Evans, Zheng-Xiang Li, Joseph L Kirschvink, Michael TD Wingate
Publication date
2000/3/1
Journal
Precambrian Research
Volume
100
Issue
1-3
Pages
313-334
Publisher
Elsevier
Description
Neoproterozoic (Sinian) sediments are exceptionally well preserved in the Three Gorges region (western Hubei Province) of the South China block. We report new paleomagnetic results, obtained independently by two separate laboratories, from a total of 157 samples of the 748±12Ma, basal Sinian Liantuo Formation at its type locality. Detailed thermal demagnetization procedures and least-squares line analyses reveal three distinct magnetic components among the suite of samples. Two overprint components can be distinguished from each other by their laboratory unblocking temperatures. The first to be removed (‘C’), always annihilated below 600°C, is common throughout the dataset but is amenable to least-squares line-fitting in only 37 samples. It yields a pole which in present coordinates resembles Mesozoic overprints identified from previous studies in the Three Gorges region (75.7°N, 174.3°E, dp=6.0°, d …
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