Age estimation of the mid-Pleistocene microtektite event in the South China Sea: A case showing the complexity of the sea-land correlation
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The present study confirms the stratigraphical position of microtektite layer being clearly located below the Brunhes/Matuyama (BIM) boundary. Based on the sedimentation rate derived from the stable isotopic and magnetic data of ODP Site 772A, cores 17957 and 17959 in the South China Sea, the age of the mid-Pleistocene impact event was estimated at 1–12 ka earlier than the Brunhes-Matuyama polarity reversal. However, the microtektites were found above the measured BIM boundary in the loess profile due to the downward deviation of the measured B/M boundary from its true position. This demonstrates the complexity of paleo-magnetic records in the loess profiles which, in turn, causes the confusion in the sea-land stratigraphic correlation.
Keywordsmicrotektites Brunhes/Matuysma (BN) boundary mid-Pleistocene sea-land correlation
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- 2.Ouyang Ziyuan el al., Impact of Asteroid & Paleoenvironmental Catastrophe—Study on Six Cenozoic Bolide-impact Events (in Chinese), Hubei Sci. & Tech. Publ., 1997, 1–170.Google Scholar
- 3.Yuan Baoyin, Preliminary discussion on the origin of Lei-Gong-Mo (tektites), Sci. Geologica Sinica (in Chinese), 1981, 4: 229.Google Scholar
- 4.Zhang Hunan, Chen Weiguang, Li Ziquan et al., Discovery of tektite in west Guangdong and its sense for determination of the age, Mar. Geol. & Quat. Geol. (in Chinese), 1991, 11(4): 101.Google Scholar
- 5.Li Chunlai, Ouyang Ziyuan, Liu Tungsheng et al., Microtektites and glassy micmspherules in loes—their discoverries and implications, Sci. in China, Ser. B, 1993, 36: 1141.Google Scholar
- 6.Xu Heling, Wu Xihao, Deng Jiwen et al., Discoveries of the unusual micrograins in the loess strata and their preliminary studies, Mar. Geol. & Quat. Geol. (in Chinese), 1993, 13(3): 57.Google Scholar
- 8.Smit, J., van Eijden, A. J. M., Troelstra, S. R., Analysis of the Australasian microtaktite event, the Toba event, and the Cretaceous/Paleogene boundary, eastern Indian Ocean. Proc. ODP Sci. Res., 1991. 121: 489.Google Scholar
- 10.Harding, B. W., Storms, M. A. et al., Proceedings of the Ocean Drilling Program, Initial Reports, 1990, 124: 75.Google Scholar
- 11.Sarnthein, M., Plaumann, U., Wang, P. et al., Preliminary report on Sonne-95 cruse “monitor monsoon” to the South China Sea, Ber.-Rep., Geol.-Paleont. Inst. Univ. Kiel, Germany, 1994, 68, 255.Google Scholar
- 13.Berggren, W. A., Kent, D. A., Swisher III, C. C. et al., A review Cenozoic geochmnology and chronostratigraphy, Geochronology, Time Scale and Global Stratigraphic Correlation (eds. Berggren, W. A. et al.), Spec. Publ. Soc. Econ. Palrontol. Mineral., 1995, 54:129.Google Scholar
- 15.Peirce, J., Weissel, J., Taylor, E. et al., Broken Ridge and Ninetyeast Ridge, Proc. ODP, 1991, 121: 869.Google Scholar