Frost, Gina Marie and Coe, Richard S. and Meng, Zifang and Peng, Zuolin and Chen, Yan and Courtillot, Vincent and Peltzer, Gilles and Tapponnier, Paul and Avouac, Jean-Philippe (1995) Preliminary Early Cretaceous paleomagnetic results from the Gansu Corridor, China. Earth and Planetary Science Letters, 129 (1-4). pp. 217-232. ISSN 0012-821X. http://resolver.caltech.edu/CaltechAUTHORS:20120911-093114587
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We report results from our paleomagnetic study of Lower Cretaceous redbeds from the Gansu Corridor, northwestern China. The characteristic remanent magnetization (ChRM) resides in hematite, often at very high unblocking temperatures (> 660°C). The directions associated with this component exhibit only reversed polarities from locality A (Sunan area), but the samples from locality B (Lanzhou area, 480 km to the southeast) show roughly antipodal normal and reversed polarities. The combined sample directional data from both localities pass a fold test at the 99% confidence level. The mean paleomagnetic pole is located at 48.7°N, 199.7°E, with A_(95) = 4.1°, which is discordant with poles of similar age elsewhere from neighboring regions in China. Although represented by relatively few samples (N = 21) this pole suggests that significant post-Cretaceous motion may have occurred between the Gansu Corridor and adjacent blocks. Relative to Eurasia or North China, the discordance corresponds to 28.1 ± 5.2° or 35.6° ± 9.7° clockwise rotation and 9.5° ± 4.5° or 9.8° ± 8.2° northward displacement respectively. The rotations support, but do not yet distinguish between, several neotectonic models assumed to have acted over the past 15–40 m.y. The displacement is not predicted by any of these models; if real, it may have occurred early in the history of the India-Asia collision, or even before.
|Additional Information:||© 1995 Elsevier Science B.V. Received 27 July 1994; accepted after revision 17 November 1994. We thank many friends and colleagues at the Lanzhou Institute of Geology of Academia Sinica for their help in making this project possible. We also thank B. Meyer for help in the field. Support was provided in part by NSF grants EAR-8707376 and EAR-9018360, in part by the Academia Sinica of the PRC, and in part by the INSU (DBT contribution 710). We gratefully acknowledge help and support provided by the Institute for Rock Magnetism at the University of Minnesota. This is manuscript 194 of the Institute of Tectonics at the University of California, Santa Cruz and IPGP contribution 1333. [PT]|
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|Official Citation:||Gina Marie Frost, Robert S. Coe, Zifang Meng, Zuolin Peng, Yan Chen, Vincent Courtillot, Gilles Peltzer, Paul Tapponnier, Jean-Philippe Avouac, Preliminary early cretaceous paleomagnetic results from the Gansu Corridor, China, Earth and Planetary Science Letters, Volume 129, Issues 1–4, January 1995, Pages 217-232, ISSN 0012-821X, 10.1016/0012-821X(94)00244-S. (http://www.sciencedirect.com/science/article/pii/0012821X9400244S)|
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|Deposited By:||Ruth Sustaita|
|Deposited On:||11 Sep 2012 17:04|
|Last Modified:||11 Sep 2012 22:53|
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