The hydrogen and oxygen isotopic compositions of hydroxyl in clay mineral from a weathering profile:new proxies for paleo-climate change?

摘要：

　　Recent studies suggest that the hydrogen and oxygen isotopic compositions of clay minerals can indicate paleoclimate.Here,we report mineralogy and stable isotopic records(δD and δ18OOH)of a weathering profile located in Fujian Province,aiming to validate whether the hydroxyl stable isotopes can indicate paleo-precipitation and paleo-temperature.Our results indicate that the δD and δ18OOH changes in kaolinite hydroxyl of the weathering profile are basically determined by the isotopic composition of paleo-meteoric water and paleo-temperature respectively.Nevertheless,whether δD and δ18OOH of kaolinite can quantitatively indicate paleo-precipitation and paleo-temperature needs to be verified further,and especially the structural oxygen isotopic composition that is the essential element for kaolinite formation temperature calculation has to be constrained in future work.

关键词： Weathering profile Hydrogen and oxygen isotopes Hydroxyl Kaolinite

作者: Chengfan Yang Shouye Yang Ni Su

作者单位: State key Laboratory of Marine Geology,Tongji University,1239 Siping Road,Shanghai 200092,P R China

会议类型: 国际会议

会议名称: The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)

会议地点: 贵阳

会议语种:英文

页码: 1-3

在线出版日期: 2017-06-11（万方平台首次上网日期，不代表论文的发表时间）