Electron spin resonance optical dating of marine, estuarine, and aeolian sediments in Florida, USA
Electron spin resonance optical dating of marine, estuarine, and aeolian sediments in Florida, USA
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DOI：
10.1016/j.yqres.2012.10.001
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发表时间：
2013-01-01
影响因子：
2.3
通讯作者：
Parham, Peter R.
中科院分区：
文献类型：
--
作者：
Burdette, Kevin E.;Rink, William J.;Parham, Peter R.
首次对佛罗里达沿岸搬运的风成硅质沉积物进行了电子自旋共振光学测年（ESROD）。ESROD利用硅位点处的光敏辐射敏感缺陷，这些缺陷已被铝和钛原子取代，以产生时间依赖性信号。与光激发发光相比，这些缺陷在更高水平的辐射剂量下饱和，因此将光学测年范围扩展到数百万年。我们的研究结果表明，特雷尔岭序列是一个多沉积单元，开始沉积约2.2 Ma，并持续到6 ka。埃芬汉序列的奥西奥拉角沉积于15 Ma左右，而查塔姆序列是一个多沉积阶地，至少保存了三个事件。(C)2012年华盛顿大学。爱思唯尔公司出版All rights reserved.
For the first time, electron spin resonance optical dating (ESROD) has been conducted on littorally transported and aeolian siliciclastic sediments in Florida. ESROD utilizes light-sensitive radiation-sensitive defects at silicon sites that have been replaced by aluminum and titanium atoms to give rise to a time-dependant signal. These defects saturate at higher levels of radiation dose, compared to optically stimulated luminescence, and therefore extend the optical dating range back into the millions of years. Our results show that the Trail Ridge Sequence is a multi-depositional unit that began deposition around 2.2 Ma and continued until 6 ka. The Osceola Cape, of the Effingham Sequence, was deposited around 15 Ma, and the Chatham Sequence was a multi-depositional terrace with at least three events preserved. (C) 2012 University of Washington. Published by Elsevier Inc. All rights reserved.