Paleomagnetic evidence for a mid-Miocene clockwise rotation of about 25° of the Guide Basin area in NE Tibet

Details Paleomagnetic evidence for a mid-Miocene clockwise rotation of about 25° of the Guide Basin area in NE Tibet Paleomagnetic evidence for a mid-Miocene clockwise rotation of about 25° of the Guide Basin area in NE Tibet

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006e%26psl.241..234y&link_type=abstract

Earth and Planetary Science Letters, Volume 241, Issue 1-2, p. 234-247.

Physics

4

Scientific paper

Ten sections of Neogene molasse-type sediments were sampled in the Guide Basin of northeastern Tibet for magnetostratigraphy [X.M. Fang, M.D. Yan, R. Van der Voo, D.R., Rea, C. Song, J.M. Parés, J. Gao, J. Nie, S. Dai, Late Cenozoic deformation and uplift of the NE Tibetan plateau: evidence from high resolution magnetostratigraphy of the Guide Basin, Qinghai Province, China, Geol. Soc. America Bull. 107 (2005) 1208-1225 [1]], but they also yield seven well-dated formation-mean directions that reveal changing declinations as rotations occurred in response to crustal deformation north of the India-Asia collision zone. Three formations are of early Miocene and Oligocene age, as indicated by fossils and magnetic reversal records, whereas four younger formations yield late Miocene and Pliocene ages. The dual-polarity magnetizations are typically antipodal, but reveal inclinations that are too shallow, most likely because of post-depositional inclination flattening. The late Miocene and younger directions show formation-mean declinations between 354° and 7°, whereas three early Miocene and late Oligocene mean declinations range from 31° to 44°. This indicates that a clockwise rotation of 25.1 ± 4.6° took place during the middle part of the Miocene (best estimate 11-17 Ma). No rotations appear to have occurred, during that time, in the Xining, Lanzhou, Linxia and Jingning basins (Longzhong Basin) to the northeast and east of the Guide Basin; however, a rotation of similar magnitude has been documented by Dupont-Nivet and colleagues for pre-Miocene (> 29 Ma) time in these areas. Collectively, these results show that the basins in NE Tibet have had independently evolving structural histories.

Affiliated with

Also associated with

No associations

Rating

Paleomagnetic evidence for a mid-Miocene clockwise rotation of about 25° of the Guide Basin area in NE Tibet does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Paleomagnetic evidence for a mid-Miocene clockwise rotation of about 25° of the Guide Basin area in NE Tibet, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Paleomagnetic evidence for a mid-Miocene clockwise rotation of about 25° of the Guide Basin area in NE Tibet will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1203255