Heinrich 3事件的实证:浙江舟山群岛泥裂

Direct evidence of Heinrich event 3:Desiccation crack in Zhoushan Islands,Zhejiang Province

在浙江舟山朱家尖岛观音湾海滩地区发现了大量发育良好,深达60cm的泥裂构造。年代学结果表明,该泥裂构造形成于31.2～30.4kaBP期间。孢粉学和粘土矿物学研究结果表明,该构造揭示了研究区域曾经发生的一次强烈的冷干事件,事件发生时植被衰落。这极可能是第四纪晚期全球范围内发生的气候快速变冷事件Heinrich3事件的一个直接的景观证据,为第四纪气候快速变化的研究提供了一种新的研究对象。

The large desiccation cracks,which are up to 60 cm deep,were developed on the intertidal zone of the Guanyin Bay,Zhujiajian Island,Zhejiang Province.The results from chronological,palynological and mineralogical analysis show that the time of the formation of the desiccation crack is coincident with the period of the environmental change from warm and humid to cold and dry.The desiccation crack corresponds to an abrupt climate shift event during 31.2-30.4 ka BP,with a decline in vegetation.It is most probable that this phenomenon demonstrates a direct landscape evidence for the worldwide abrupt climate event-the Heinrich event 3.The desiccation crack provides a new method for the research of Quaternary abrupt climate shift events.