Geochemistry Of Tektites From Maoming Of Guandong Province, China

• Main Authors: Yung-Tan Lee, Huang, Ren-Yi, Jyh-Yi Shih, Meng-Lung Lin, Yen-Tsui Hu, Hsiao-Ling Yu, Chih-Cheng Chen
• Format: Text
• Language: English
• Published: Zenodo 2011
• Subjects: Geochemistry; FOS Earth and related environmental sciences; Guandong province; South China; Tektites; Beck; McLennan; Pacific; Tera; Victoria Land
• Online Access: https://dx.doi.org/10.5281/zenodo.1074465; https://zenodo.org/record/1074465

We measured the major and trace element contents and Rb-Sr isotopic compositions of 12 tektites from the Maoming area, Guandong province (south China). All the samples studied are splash-form tektites which show pitted or grooved surfaces with schlieren structures on some surfaces. The trace element ratios Ba/Rb (avg. 4.33), Th/Sm (avg. 2.31), Sm/Sc (avg. 0.44), Th/Sc (avg. 1.01) , La/Sc (avg. 2.86), Th/U (avg. 7.47), Zr/Hf (avg. 46.01) and the rare earth elements (REE) contents of tektites of this study are similar to the average upper continental crust. From the chemical composition, it is suggested that tektites in this study are derived from similar parental terrestrial sedimentary deposit which may be related to post-Archean upper crustal rocks. The tektites from the Maoming area have high positive εSr(0) values-ranging from 176.9~190.5 which indicate that the parental material for these tektites have similar Sr isotopic compositions to old terrestrial sedimentary rocks and they were not dominantly derived from recent young sediments (such as soil or loess). The Sr isotopic data obtained by the present study support the conclusion proposed by Blum et al. (1992)[1] that the depositional age of sedimentary target materials is close to 170Ma (Jurassic). Mixing calculations based on the model proposed by Ho and Chen (1996)[2] for various amounts and combinations of target rocks indicate that the best fit for tektites from the Maoming area is a mixture of 40% shale, 30% greywacke, 30% quartzite. : {"references": ["1] J. D. Blum , D. A. Papanastassiou, C. Koeberl, and G. J. Wasserburg, \"Nd\nand Sr isotopic study of Australasian tektites:New constraints on the\nprovenance and age of target material\", Geochim. Cosmochim. 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