武汉阳逻砾石层ESR地层年代学研究

ESR Stratigraphically Chronological Study of the Gravel Layer in Yangluo Town,Wuhan City

武汉"阳逻砾石层"是长江中下游新生代的一个重要的岩石地层单位,其形成年代一直是地质和地理学者关注的重要问题。为了更深入地探讨这一问题,在它的两个典型的剖面中采集了8个样品进行ESR地质年代测试,测试结果表明,阳逻砾石层形成于新近纪早更新世中晚期。将本次ESR测年数据与前人的热释光的测年数据、江汉平原西缘和北缘相同岩石地层层位和相同地貌位置的砾石层的测年数据、长江中下游网纹砾石层的测年数据比较发现,它们具有较好的一致性。

The gravel layer in Yangluo Town, Wuhan City is an important Neozoic rock unit developed in the middle and lower reaches of the Yangtze River, its forming age is a key issue to which geologists and geographers always pay close attention. In order to discuss this issue in deep-going way, we collected eight samples from two typical sections to determine their geological ages, and the results showed that the gravel layer in Yangluo Town was formed in the Neogene of the middle and lower Early Pleistocene. By comparing these ESR ages with other ages which were determined by thermoluminescence techniques, the ages of gravels in the same stratum and position in the west and north of the Jianghan Plain, and those of the net-like gravels in the middle and lower reaches of the Yangtze River, we found that these ages are coincident.