Abstract
Abstract A detailed paleomagnetic and rock magnetic investigation was carried out on calcareous nodule layers embedded in the loess-paleosol sequences near Baoji city, southern Chinese Loess Plateau. The anisotropy of low-field magnetic susceptibility confirms that calcareous nodules retain the primary sedimentary fabric of original deposits. Rock magnetic properties demonstrate that calcareous nodules have the same mineralogy and grain sizes as loess-paleosol deposits. Characteristic remanent magnetizations of calcareous nodules have directions consistent with those of adjacent loess and paleosol deposits. The Punaruu event, previously found from loess deposits in the upper part of loess unit L13 in Weinan, southern Chinese Loess Plateau, is observed at the corresponding stratigraphic level in the calcareous nodule layer. These observations indicate that the calcareous nodule layers preserve primary remanent magnetizations of original deposits before calcification, and that they can contribute to paleomagnetic studies in the Chinese Loess Plateau.
Highlights
Aeolian sediments of the Chinese Loess Plateau (CLP)in north-central China cover an area of about 440,000 km2 (Liu, 1985)
A number of calcareous nodule layers ranging from about 30 cm to >200 cm in thickness are intercalated within the loess-paleosol sequences
Magnetic fabrics of 24 specimens from eight calcareous nodule layers were analyzed by means of anisotropy
Summary
Aeolian sediments of the Chinese Loess Plateau (CLP)in north-central China cover an area of about 440,000 km2 (Liu, 1985). 145 oriented block samples were collected from adjacent loess-paleosol units to compare with their paleomagnetic results, especially those around magnetic polarity boundaries. This result suggests that the calcareous nodule layers do preserve the primary sedimentary fabric.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
