Heavy-mineral analysis as a tool in tephrochronology, with an example from the La Sal Mountains, Utah, U.S.A.
Heavy-mineral analysis as a tool in tephrochronology, with an example from the La Sal Mountains, Utah, U.S.A.
复制标题
重矿物分析作为岩石年代学的工具，以美国犹他州拉萨尔山脉为例
DOI：
10.2478/logos-2013-0006
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发表时间：
2013
影响因子：
2.9
通讯作者：
A. Kleber
中科院分区：
文献类型：
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作者：
A. Kleber
美国犹他州拉萨尔山陡坡上的一个基本上纯的火山灰层，与美国新墨西哥州Jemez山1.65 Ma的Guaje火山灰相对比。拉萨尔火山灰层下沉积物中的重矿物含量和玻璃碎片表明，火山灰成分包含在比纯层更古老的沉积物中。这表明火山灰物质可能在保持其纯净特征的同时被重新加工，这可能是由于层流运输或冻结条件下的位错。这就需要非常小心地处理灰期发现。
Abstract An essentially pure tephra layer on a steep slope in the La Sal Mountains, Utah, U.S.A., is correlated with the 1.65 Ma old Guaje Tephra derived from the Jemez Mountains, New Mexico, U.S.A. The heavy-mineral contents and glass shards in sediments beneath the La Sal tephra layer indicate that tephra constituents are contained in deposits considerably older than the pure layer. This suggests that tephra material may become reworked while retaining its pure character, possibly due to laminar transport or to dislocation in a frozen condition. This raises the need to handle tephrochronological findings with great care.