OSL dating of a lacustrine to fluvial transitional sediment sequence in Valle Toledo, Valles caldera, New Mexico

Q4 Earth and Planetary Sciences

New Mexico Geology Pub Date : 2007-01-01 DOI:10.58799/nmg-v29n4.112

K. Lepper, S. Reneau, J. Thorstad, Boone Pickens, A. Denton

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引用次数: 3

Abstract

Quaternary lacustrine deposits exist within several valleys in the Valles caldera in northcentral New Mexico . These deposits contain potentially valuable paleoclimatic records . We report OSL ages for a section of unconsolidated Quaternary sediments exposed in the southwest part of Valle Toledo within Valles caldera . The sequence represents the transition over time from lacustrine to fluvial deposition at the site . We present a stratigraphically coherent depositional chronology for the Valle Toledo section consistent with the available radiocarbon constraint based on analysis of bootstrapped dose distributions derived from data collected by IRSL MAAD procedures . The ages suggest the existence of a late Pleistocene lake in Valle Toledo from at least 48 .5 ka to ~44 ka, which is consider ably younger than age interpretations based on correlation to a >500 ka rhyolite dam across San Antonio Creek . This study helps to emphasize the need for additional research to decipher the geologic history of the intra-caldera lakes as well as to correlate the records of climate and environmental change among the lacustrine deposits within Valles caldera .

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新墨西哥州valalles火山口的Valle Toledo湖相到河流过渡沉积序列的OSL测年

第四纪湖相沉积存在于新墨西哥州中北部山谷火山口的几个山谷中。这些沉积物包含有潜在价值的古气候记录。我们报告了在Valle Toledo火山口的西南部暴露的一段松散的第四纪沉积物的OSL年龄。该层序代表了该遗址从湖泊沉积到河流沉积的过渡时期。基于对来自IRSL MAAD程序收集的数据的自启动剂量分布的分析，我们提出了与可用放射性碳约束相一致的Valle Toledo剖面地层相干沉积年代学。这些年龄表明，在Valle Toledo存在一个晚更新世湖泊，时间至少为48.5 ka至~44 ka，这比基于与横跨San Antonio Creek的bbbb500 ka流纹岩坝的相关性的年龄解释要年轻得多。这项研究有助于强调进一步研究的必要性，以破译火山口内湖泊的地质历史，并将山谷火山口内湖泊沉积物的气候和环境变化记录联系起来。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

New Mexico Geology Earth and Planetary Sciences-Geology

CiteScore

0.60

自引率

0.00%

发文量

期刊介绍： New Mexico Geology is a quarterly, peer-reviewed journal available by subscription. Articles of original research are generally less than 10,000 words in length and pertain to the geology of New Mexico and neighboring states, primarily for an audience of professional geologists or those with an interest in the geologic story behind the landscape. The journal also publishes abstracts from regional meetings, theses, and dissertations (NM schools), descriptions of new publications, book reviews, and upcoming meetings. Research papers, short articles, and abstracts from selected back issues of New Mexico Geology are now available as free downloads in PDF format. Back issues are also available in hard copy for a nominal fee.