Evolution of the rare earth element composition of Paleogene groundwaters as recorded in vertebrate fossils from Toadstool Geologic Park, Nebraska, USA

摘要：

Rare earth elements in vertebrate fossils from upper Eocene and Oligocene sediments of Toadstool Geologic Park, northwestern Nebraska, record mixing and evolution of Paleogene groundwaters and variations in paleoenvironments. REE signatures indicate that HREE-enriched alkaline groundwater reacted with LREE- and MREE-enriched sediments to produce three component mixtures. REE are paleoenvironment and paleoclimate proxies. Time series analysis suggests that REE ratios are affected by cycles of ca. 1 Ma and 700 and 500 Ka, similar to some Milankovitch periodicities.

作者: D.E.Grandstaff D.O.Terry

作者单位: Temple University, Department of Geology, Philadelphia, USA

会议类型: 国际会议

会议名称: 第十二届水-岩相互作用国际研讨会(P0roceedings of the 12th International Symposium on Water-Rock Interaction)

会议地点: 昆明

会议语种:英文

页码: 961-964

在线出版日期: 2007-07-31（万方平台首次上网日期，不代表论文的发表时间）