INITIAL STRATA OCCURRENCE OF THE SOUTH CHINA TEKTITE IN STRATA AND ITS IMPLICATION FOR EVENT-STRATIGRAPHY

The South China tektite,especially a type of big tektite,is solely found in Chinese continent at the early time,belonging to Asia-Australia strowed area. The tektites were distributed in the areas of Guangxi, Guangdong and Hainan Provinces. According to the investigations in two types of the stratigraphic profiles, which are the boundary section of Beihai Formation and Zhanjiang Formation and the section of weathering crust on the 3rd tableland, it is suggested that there are three type of big tektites in South China continent, which are imbeded-initial-strowed type,exposed-initial-strowed type and deuterogenic moved-type;the initial occurrence of the South China tektite in strata is in the middle horizon within Beihai Formation, which is the erosion surface on the top of the lower part of Beihai Formation, but not on the top of Zhanjiang Formation. The chemical compositions, average grain size and the palynology characteristics indicate that a seriesd of geological events occurred in the period of 0.1~0.8 MaBP, so that the tektite event and its initial stratum are a good time scale for the correlation of marine and continental event-stratigraphy as well as the global geodynamics. This paper is in memory of Prof. Wu Xihao who was an excellent scientist in the field of Neozoic geology.