用晶体岩石学分析筛选洞穴U/Th年龄——以青藏高原东南部日格洞为例

IF 1.9 3区地球科学 Q3 GEOGRAPHY, PHYSICAL

Quaternary International Pub Date : 2025-07-03 DOI:10.1016/j.quaint.2025.109902

Shihao Lei , Hanying Li , Youwei Li , Rui Zhang , Mei He , Xiyu Dong , Xiaowen Niu , Jian Wang , Haiwei Zhang , Zhengguo Shi , Youfeng Ning , Hai Cheng

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引用次数: 0

摘要

洞穴是水文气候变化的重要记录者。虽然230Th定年技术是一种广泛使用的确定岩石层绝对年代学的方法，但沉积过程中的地球化学和地球物理过程可能导致铀浓度的异常变化并产生反年龄，影响年龄模型的建立。本文采用岩石学分析和230Th测年技术相结合的方法，对青藏高原东南部的岩石层样品RG-1进行了年龄测定。我们观察到所有的反转年龄都位于马赛克区域内。为了解决这个问题，我们重新采样并测量了层的年龄，同时排除了马赛克区域。结果在误差范围内与年龄模型非常吻合。这些发现引入了一种结合岩石学的方法来提高230年代反演的准确性。

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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Screening speleothem U/Th ages through crystal petrography analysis: A case study from Rige cave in the Southeast Tibetan Plateau

Speleothems are important recorders of hydroclimate changes. Although ²³⁰Th dating technique is a widely-used method to determine speleothem absolute chronology, geochemical and geophysical processes during deposition may lead to anomalous variations in U concentrations and generate reversed ages, impacting the establishment of age model. Here, we present a combined approach utilizing petrographic analyses and ²³⁰Th dating techniques to accurately determine the ages of speleothem sample RG-1 from southeastern Tibetan Plateau. We observed that all reversal ages were located within the mosaic regions. To address this, we resampled and measured the ages in layers while excluding the mosaic regions. The results aligned well with the age model within the margin of error. These findings introduce a method that incorporates petrography to enhance the accuracy of reversed ²³⁰Th dating.

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来源期刊

Quaternary International 地学-地球科学综合

CiteScore

5.60

自引率

4.50%

发文量

336

审稿时长

3 months

期刊介绍： Quaternary International is the official journal of the International Union for Quaternary Research. The objectives are to publish a high quality scientific journal under the auspices of the premier Quaternary association that reflects the interdisciplinary nature of INQUA and records recent advances in Quaternary science that appeal to a wide audience. This series will encompass all the full spectrum of the physical and natural sciences that are commonly employed in solving Quaternary problems. The policy is to publish peer refereed collected research papers from symposia, workshops and meetings sponsored by INQUA. In addition, other organizations may request publication of their collected works pertaining to the Quaternary.