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地质学报  2007 

洞穴石笋地质事件的定年及意义

Keywords: 石笋沉积,事件,定年,华南

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Abstract:

本文以贵州荔波董歌洞3号石笋第6、1次和4号石笋第2次主要沉积间断为例,说明依序发生于89.96kaBP、128.65kaBP、113.40kaBP,结束于0.32kaBP、128.21kaBP、65.50kaBP,延续时间89.65ka、0.44ka、47.90ka的沉积间断,具多级次的地质、气候演变属性,沉积间断时间长,显示度明显,气候事件复杂,间断频发,必有更丰富的气候、环境、地质内涵。贵州都匀凯酉七星洞2号石笋Q2F1、Q2F2,5号石笋Q5F3是碰断面,依序发生于74.24kaBP、60.72kaBP、36.80kaBP,彼此相间隔13.52ka、23.92ka,断面及其上、下石笋段的沉积特征,属突变(灾害)性事件,也有其古气候环境意义。系列事件的测年,须在系统测年基础上,于间断、碰断面上下加密测试,及石笋沉积特征的综合观测,以提高事件测年和定性的可信度,增加古气候环境信息量。

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