Guangxi glass geochemistry of meteorites

Title: Guangxi glass geochemistry of meteorites
　　Author: Fu Tingting
　　Degree-granting units: Chengdu University of Technology
　　Keywords: Guangxi;; tektites;; trace elements;; geochemistry
　　Summary:
　　Glass meteorites found on Earth is a special object, different from other meteorites, tektites on Earth have some fall zone, each zone of the glass meteorite fall, representing a fall of celestial events. Their causes and sources have not yet been completely solved the mystery of nature. For archaeologists, the meteorite by measuring the production age of the glass, Magnetic lifter and unearthed in which the layers can provide relevant geological background information in order to calculate the schedule of ancient human history and culture. Guangxi region of China in addition to Qionglei another glass meteorite outside the main distribution area. China in recent years scholars in the area of ​​the glass after another meteorite made a more systematic work, but it has been the lack of the trace element data. The trace element geochemistry is to discuss the causes of glass meteorites, source and evolution of one of the main arguments. Subject of this paper to a glass 15 in Guangxi five meteorite samples for the study, theory and application of geochemical methods to systematically study the geochemical characteristics, in order to obtain the chemical composition of tektites in Guangxi and trace element data for international Such studies provide Chinese data. Based on these data analysis while the glass in different regions of the same meteorite and differences in order to determine the Guangxi tektites in material source. This issue not only has scientific significance, but also for further research to provide material and guidance glass meteorites, have practical significance.
　　We Baise, Bobai, Fusui, Tianyang, Tiandong five to fifteen pieces of glass to collect meteorites and Earth Sciences at the University of Hong Kong, Sichuan Province, to study nuclear technology and the Chengdu University of Technology Key Laboratory of Chemical Laboratory by ICP -MS analysis, chemical analysis, neutron activation analysis and other analysis to analyze the chemical composition of tektites in Guangxi and trace elements. By trace elements in Guangxi tektites cluster analysis, factor analysis and correlation analysis of meteorites in the chondrite-normalized REE distribution points, combined with other areas of foreign glass meteorite data, studied the meteorite's Guangxi glass geochemistry . Guangxi tektites through the rest of the world comparison tektites, meteorite studies the similarities and differences in different parts of the glass and make a material source identification.
　　Through the above research, the following key knowledge:
　　1 through the Guangxi region, five samples of glass distribution analysis of meteorites can be seen in different parts of tektites in Guangxi chemical composition and trace element composition of the same, but on different levels, in general, not very different; five samples REE distribution patterns are similar, both negative slope, LREE enrichment, flat heavy rare earth trend, five curves almost coincide with the points, indicating that the five regions of the glass composition is similar meteorite source region, a target from the same source, should belong to the same spreading area, the source should be the mother of crustal materials.
　　2 Chinese glass meteorites mainly in Hainan Island, Leizhou Peninsula, Bobai and Baise area, it has been suggested that these three areas of glass meteorites belong to the same group. Can be seen through the analysis of these three regions of the glass chemical composition of meteorites is basically the same, therefore, should belong to the same group.
　　3 Guangxi tektites from the chemical composition and chondrite-normalized REE distribution patterns map view, with no common celestial rock, mare basalt and highland anorthosite and mafic rock types on Earth very far. From the chemical http://www.999magnet.com/products/131-magnetic-lifter composition point of view, it is with the surface sediments (clays, shales, sandstone) or acid rock similar to, but the trace of view, closer to the glass surface sediments meteorites, and therefore its source is likely shale or sandstone. In the Rb / Sr-Rb / Ba diagram, the sample points are concentrated in the sandstone area, can determine the source of Guangxi tektites from the sandstone rocks, glass and Australian Ya Sabu area have similar meteorite material source.
　　4 different regions of Guangxi and trace element composition of glass meteorites of Australia Ya Sabu areas with similar characteristics, with the rest of the world spreading area of ​​glass meteorites are quite different. Guangxi meteorite formation age of the glass is about 0.6-0.69Ma, Australia Ya Sabu area with the formation of glass meteorites of similar age; accordingly, that tektites in Guangxi region should be attributed to O Ya Sabu, the product of the same event.
　　Degree Year: 2010