globalchange  > 气候变化与战略
CSCD记录号: CSCD:5346891
论文题名:
西域砾岩宇宙成因核素~(26)Al/~(10)Be埋藏定年探索
其他题名: COSMOGENIC NUCLIDES ~(26)Al/~(10)Be BURIAL DATING OF XIYU CONGLOMERATE
作者: 韩非; 陈杰; 尹功明
刊名: 第四纪研究
ISSN: 1001-7410
出版年: 2015
卷: 35, 期:1, 页码:138-145
语种: 中文
中文关键词: 西域砾岩 ; 埋藏测年
英文关键词: ~(26)Al/~(10)Be ; cosmogenic nuclides ; ~(26)Al/~(10)Be burial dating ; Xiyu conglomerate
WOS学科分类: GEOLOGY
WOS研究方向: Geology
中文摘要: 西域砾岩是分布于青藏高原北缘天山、昆仑山一带的一套晚新生代砾石堆积地层,获知其可靠的年代信息对于理解高原隆升及地貌演化过程尤为关键。宇宙成因核素~(26)Al/~(10)Be埋藏测年是近年来发展起来的同位素测年新技术。本文对帕米尔高原西昆仑山山前的两个西域砾岩剖面采集的砾石样品进行了~(26)Al/~(10)Be埋藏测年分析。简单快速埋藏模式计算获得亚马勒剖面西域砾岩下部混合砾石样品的埋藏年龄>3.5Ma,对该剖面西域砾岩上部5个样品加权平均得到的年龄为2. 11+0.60/-0.46Ma;另一处奥依塔克西域砾岩生长地层底部砾石样品的埋藏年龄在0.46~7. 12Ma。研究表明,研究区的西域砾岩堆积具有穿时性。本文是~(26)Al/~(10)Be埋藏测年方法应用于西域砾岩年代学研究的一次有益探索和尝试,并对在西域砾岩~(26)Al/~(10)Be埋藏测年中存在的问题进行了探讨。
英文摘要: Distributed along the periphery of Tianshan and Kunlun Mountains in the northern margin of Tibetan Plateau, Xiyu conglomerate formation is a unit of Late Cenozoic gravel deposit which provides significant information of tectonic activities of the Northern Tibetan Plateau and global climate changes. It is crucial for attaining its depositional age in order to better understand the growth of Tibetan Plateau and related landscape evolution process. Cosmogenic nuclides ~(26)Al/~(10)Be burial dating is an emerging radioisotopic dating technique which could be used in dating gravel samples containing quartz mineral up to 5Ma. This study intends to explore the possibility of using ~(26)Al/~(10)Be burial dating method to determine the age range of the Xiyu conglomerates of two sections-Yamale (39°03'N, 75°35'E) and Oytake (38°58'N, 75°26'E) in the foreland of western Kunlun Mountain on Pamir Plateau, which has intact and well-preserved stratigraphy in great depth. Calculating with simple burial model, the burial age of lower layer sample of Yamale section is older than 3. 5Ma. Weighted mean age of five samples from upper layer is 2.110.60/0.46Ma. The simple burial age of another amalgamated sample from the bottom of growth strata of Xiyu conglomerate section in Oytake at 0. 46 ~7. 12Ma. In this study, we find several difficulties and problems of ~(26)Al/~(10)Be burial dating of Xiyu conglomerate : (1) High erosion rates in the source area results in a low initial concentration of nuclides and large analytical uncertainty because of approaching lower limit of AMS measurement; (2)The ages of certain samples reach the limit of maximum age of ~(26)Al/~(10)Be burial dating ; (3) High concentration of stable 27A1 and other nuclides in the samples interfere the chemical separation and the precision of AMS measurement; (4) Multiple periods of erosion and deposition will change the apparent age of the sample, and isochron analysis may not always work in some cases. Weighted mean of isolevel multiple samples could give meaningful geological ages. This study is an exploration work of applying ~(26)Al/~(10)Be burial dating method on Xiyu conglomerate. Although this work does not give a precise chronological framework of this deposition, it shows the potential for the future study of burial dating of Late Cenozoic gravel deposits in the Northwestern China.
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/149229
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作者单位: 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029, 中国

Recommended Citation:
韩非,陈杰,尹功明. 西域砾岩宇宙成因核素~(26)Al/~(10)Be埋藏定年探索[J]. 第四纪研究,2015-01-01,35(1):138-145
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