Binary sources of loess on the Chinese Loess Plateau revealed by U-Pb ages of zircon
Binary sources of loess on the Chinese Loess Plateau revealed by U-Pb ages of zircon
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锆石U-Pb年龄揭示中国黄土高原黄土二元物源
DOI：
10.1016/j.yqres.2013.05.007
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发表时间：
2013-11-01
影响因子：
2.3
通讯作者：
Li, Gaojun
中科院分区：
文献类型：
--
作者：
Che, Xudong;Li, Gaojun
碎屑锆石的年龄分布已被用来追踪沉积物的来源。黄土高原（CLP）和藏北高原（NTP）沉积物的锆石年龄具有很大的相似性，这表明青藏高原的风尘是通过西风或黄河输送到CLP的。然而，NTP粉尘也可以通过西北风从阿拉善干旱地区（AALs），其中的材料都接收来自NTP和戈壁阿尔泰山（GAMs）。本文报道了AALs砂岩、NTP黄土和CLP黄土的锆石U-Pb年龄。结果表明，AAL中的锆石是由NTP和GAM锆石混合而成的。NTP黄土主要来源于当地。从NTP和GAMs的材料的混合定义的CLP上的黄土的锆石年龄比纯NTP源更好。CLP上黄土的锆石年龄没有时间和空间的不均匀性，这表明AAL中的混合物质可能有风成来源。(C)2013年华盛顿大学。爱思唯尔公司出版All rights reserved.
The age distribution of detrital zircon has been used to trace sediment sources. Existing datasets show great similarity of zircon ages between the loess on the Chinese Loess Plateau (CLP) and the sediments from the North Tibetan Plateau (NTP), implying that eolian dust is delivered from the NTP to the CLP by westerly winds or via the Yellow River. However, NTP dust can also be transported by northwesterly winds from the Alxa arid lands (AALs), where materials are received from both the NTP and the Gobi Altay Mountains (GAMs). Here we report U-Pb zircon ages for AALs sands and NTP and CLP loess. The results show that the zircons in the AALs are mixed from NTP and GAMs zircons. NTP loess is mainly derived from local sources. Mixing of materials from the NTP and GAMs defines the zircon ages of the loess on the CLP better than the pure NTP source. No temporal and spatial heterogeneities of zircon ages have been observed for the loess on the CLP, which suggests that the well-mixed materials in the AALs likely have an eolian source. (C) 2013 University of Washington. Published by Elsevier Inc. All rights reserved.