Magnetostratigraphy of an early-middle Miocene loess-soil sequence in the western Loess Plateau of China
Article first published online: 25 SEP 2007
Copyright 2007 by the American Geophysical Union.
Geophysical Research Letters
Volume 34, Issue 18, September 2007
How to Cite
2007), Magnetostratigraphy of an early-middle Miocene loess-soil sequence in the western Loess Plateau of China, Geophys. Res. Lett., 34, L18305, doi:10.1029/2007GL031162., and (
- Issue published online: 25 SEP 2007
- Article first published online: 25 SEP 2007
- Manuscript Accepted: 24 AUG 2007
- Manuscript Revised: 21 AUG 2007
- Manuscript Received: 3 JUL 2007
- Miocene loess;
 Stratigraphy and magnetic susceptibility of the Quaternary eolian deposits at different sites in China can be closely correlated, confirming their spatial coherence and temporal continuity. The extent to which these conclusions are true for the Miocene loess-soil sequences remains to be addressed. Here, a 231.9-m eolian section, QA-III, is geomagnetically dated, yielding an age span of 21.4–11.4 Ma, with the portion older than 19.6 Ma being partially water-reworked. The magnetozones, litholigic structure and magnetic susceptibility of the sequence are highly correlative with the QA-I and QA-II sections, 30 km west of QA-III. These sequences demonstrate that the Miocene loess deposits are also spatially correlative in stratigraphy, present a near-continuous sequence of paleoenvironment changes, and that magnetic susceptibility is a useful tool for stratigraphic correlation. The basal age of QA-III confirms again the onset of Asian inland deserts and monsoon-dominate climates by the early Miocene.