Optical dating of Holocene sediments from the Yangtze River (Changjiang) Delta, China
Optical dating of Holocene sediments from the Yangtze River (Changjiang) Delta, China
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中国长江三角洲全新世沉积物的光学测年
DOI：
10.1016/j.quaint.2018.01.011
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发表时间：
2018-02
影响因子：
2.2
通讯作者：
Chen Zhongyuan
中科院分区：
文献类型：
--
作者：
Nian Xiaomei;Zhang Weiguo;Wang Zhanghua;Sun Qianli;Chen Jing;Chen Zhongyuan
建立一个可靠的年表是了解三角洲的演变，这通常是使用放射性碳（14 C）测年和最近出现的光释光（OSL）技术进行的至关重要。后者在全新世长江三角洲存款沉积中的应用还相当有限。在这项研究中，两个60.9米长的岩心采集自泰州（TZ）和南通（NT）的古下切河谷的长江，和总共7个和9个OSL样品，分别从TZ和NT的核心。此外，10个加速器质谱（AMS）14 C年龄的TZ核心和8个AMS 14 C年龄，以前从NT核心获得。将单份再生剂量（SAR）方案应用于粗粉砂（45-63 μm）和细砂（90-125 μm）石英。结果表明，45-63 μm粒级的颗粒似乎比90-125 μm粒级的颗粒漂白得更好，为了获得准确的年龄估计，需要检测未充分漂白的沉积物。TZ岩心样品的年龄范围为3 ~ 9 ka，NT岩心样品的年龄范围为1 ~ 14 ka，在实验误差的范围内，样品的年龄与地层顺序基本一致。TZ岩芯的AMS 14 C年龄明显大于OSL年龄，而NT岩芯的AMS 14 C年龄与OSL年龄基本一致。当使用AMS 14 C测定三角洲沉积物的年代时，应谨慎。根据OSL年龄，在两个岩心中可以发现两个快速的积累速率，这与早全新世海平面的快速上升和晚全新世三角洲前缘相的迁移有关。这些研究表明，光释光技术是一种有效的方法来确定全新世三角洲沉积，特别是在粗糙的沉积层，有机碳物质是稀疏的。
Establishing a reliable chronology is essential for understanding delta evolution, which is normally performed using radiocarbon (14C) dating and the recently emerging technique of optically stimulated luminescence (OSL). The application of the latter one to the Holocene Yangtze River (Changjiang) Delta deposit is still quite limited. In this study, two 60.9-m-long cores were collected from Taizhou (TZ) and Nantong (NT) within the paleo-incised valley of the Yangtze River, and a total of seven and nine OSL samples were collected from the TZ and NT cores, respectively. In addition, ten accelerator mass spectrometry (AMS)14C ages of the TZ core were presented with eight AMS14C ages that were previously obtained from the NT core. The single-aliquot regenerative-dose (SAR) protocol was applied to coarse silt-sized (45–63 μm) and fine sand-sized (90–125 μm) quartz. The results showed that the grains in the 45–63 μm size fractions appeared to be better bleached than those in the 90–125 μm size fractions, and the detection of insufficiently bleached sediments is required in order to obtain accurate age estimates. The ages adopted for the samples range from 3 ka to 9 ka for the TZ core, and from 1 ka to 14 ka for the NT core, which were in general internally coherent within the limits of experimental errors and with respect to their stratigraphic order. The AMS14C age of the TZ core were significantly older than their OSL ages, while those from the NT core generally showed good agreement with their OSL ages. One should be cautious when using AMS14C to date deltatic deposits. Based on the OSL ages, two periods of rapid accumulation rates can be found in both cores, which are linked to the rapid sea level rise in early Holocene and migration of delta front facies in late Holocene. These investigations indicate that OSL technique is an effective method with which to date Holocene deltaic deposits, especially in coarse sedimentary layers where organic carbon material is sparse.
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影响因子：
2.7
作者：
E. Chamberlain;J. Wallinga;T. Reimann;S. Goodbred;M. Steckler;Zhixiong Shen;R. Sincavage
通讯作者：
E. Chamberlain;J. Wallinga;T. Reimann;S. Goodbred;M. Steckler;Zhixiong Shen;R. Sincavage
DOI：
10.1177/0959683607077034
发表时间：
2007-05
期刊：
The Holocene
影响因子：
--
作者：
H. Roberts;A. Plater
通讯作者：
H. Roberts;A. Plater
中国长江三角洲平原南部沿海沉积物记录的 OIS 3 海平面上升
影响因子：
2.3
作者：
Jones, Brian G.;Chen, Ting;Zhao, Baocheng;Zhan, Qing
通讯作者：
Zhan, Qing
影响因子：
2.7
作者：
Durcan, Julie A.;King, Georgina E.;Duller, Geoffrey A. T.
通讯作者：
Duller, Geoffrey A. T.
影响因子：
4.4
作者：
M. Blaauw;J. Christen
通讯作者：
M. Blaauw;J. Christen