The characteristics and geological significance of Quaternary sediments from Wenchang area of Hainan Province
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摘要: 海南省文昌市东部沿海一带是华南地区第四系发育较为典型的地区之一,其分布受新生代晚期形成的新构造格局的控制。通过对第四系沉积物特征、粒度分析、重矿物锆石采用激光剥蚀等离子体质谱(LA-ICP-MS)技术进行年龄测定,并选用206Pb/238U年龄做谐和年龄频谱图。认为该区第四系松散沉积具有不完全相同的物源。八所组与烟墩组的沉积物源区具有一定的相似性,北海组的沉积物源区明显不同于八所组和烟墩组。这种物源的差异性可能直接导致了第四系成矿作用的不同。Abstract: The research zone is located in the eastern costal belt of Wenchang, Hainan Province, where Qua-ternary System is quite typical in South China. The distribution of the Quaternary System was affected by Neo-tectonics formed in the late stage of Cenozoic era. By applying LA-ICPMS method to detect the age of sediment, granularity and zircon and choosing 206Pb/238U ages to draw an age-concordant spectrogram, and it reveals that the sources of unconsolidated sediments are not completely equivalent in different places. The source region of sediments in Basuo Formation and Yandun Formation is similar, which is quite different from Beihai Formation. The differentiation of source regions will lead to different mineralization of Quaternary Sys-tem.
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Key words:
- Hainan Province /
- Quaternary System /
- grading analysis /
- heavy minerals /
- source region /
- Wenchang area
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