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应用210Pb技术计算年轻石笋沉积速率及判断石笋沉积环境

Keywords: 210Pbex,初始,210Pb放射性比活度,桂林

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Abstract:

通过对桂林周边3个洞穴的3个石笋进行210Pb测试,分别计算出3个石笋的沉积速率:盘龙洞石笋PL-4的平均沉积速率为0.042mm/a,茅茅头大岩石笋DY-2的平均沉积速率为0.731mm/a,住岩石笋ZY-5的平均沉积速率为0.029mm/a;另外,通过滴水实验验证了石笋正在沉积,且茅茅头大岩沉积速率较大,盘龙洞和住岩沉积速率较小。通过与其他地区石笋以及对3个洞穴石笋之间的初始210Pb放射性比活度的比较,发现桂林地区石笋初始210Pb放射性比活度低,主要是受制于桂林特殊的地质背景和地理环境;而3个洞穴由于洞穴封闭条件、石笋沉积速率、滴水点等差异,石笋的初始210Pb放射性比活度也表现出差异。

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