地球科学进展

地球科学进展 ›› 2018, Vol. 33 ›› Issue (10): 1034 -1047. doi: 10.11867/j.issn.1001-8166.2018.10.1034.

综述与评述 上一篇    下一篇

颗粒破碎铀同位素年代学在风尘系统中的应用
付渊赩( ), 李乐, 陈骏 *( )   
  1. 南京大学 地球科学与工程学院 表生地球化学教育部重点实验室,江苏 南京 210023
  • 收稿日期:2018-06-06 修回日期:2018-08-09 出版日期:2018-10-10
  • 通讯作者: 陈骏 E-mail:fyuanhe@163.com;chenjun@nju.edu.cn
  • 基金资助:
    国家自然科学基金项目“颗粒破碎铀同位素年代技术的发展及其在风尘系统中的应用”(编号:41730101)资助.

Application of Uranium Isotope Chronology for Partical Comminution in the Eolian Dust System

Yuanhe Fu( ), Le Li, Jun Chen *( )   

  1. Ministry of Education Key Laboratory of Surficial Geochemistry, School of Earth Sciences and Engineering,Nanjing University, Nanjing 210023, China
  • Received:2018-06-06 Revised:2018-08-09 Online:2018-10-10 Published:2018-11-16
  • Contact: Jun Chen E-mail:fyuanhe@163.com;chenjun@nju.edu.cn
  • About author:

    First author:Fu Yuanhe(1993-), male, Bingzhou City, Shandong Province,Master student. Research areas include uranium isptope geochemistry. E-mail:fyuanhe@163.com

  • Supported by:
    Project supported by the National Natural Science Foundation of China "Uranium isotope chronology for partical comminution in the eolian dust system"(No.41730101).
全文 ( 20 ) 下载PDF ( 974 )

风尘系统是陆地表层系统的重要组成部分,对诸多关键带有着重要作用。风尘的产生机制与搬运过程对理解风尘的环境功能和解读风尘沉积的古气候记录至关重要。以往传统地球化学方法只能反映最终剥蚀区的岩性或矿物结晶年龄,无法区分相同最终物源背景下不同粉沙的产生机制和搬运中间过程,是当前风尘研究的最大挑战之一。由α衰变反冲导致的细粒物质的234U/238U值反映颗粒自破碎以来经历的时间,可能能有效示踪粉尘的产生机制以及搬运中间过程,但是铀同位素破碎年代学在风尘系统中还鲜有应用。总结了限制铀同位素广泛应用的复杂因素,并根据最新的研究进展,针对在风尘系统中验证和发展铀同位素破碎年代学,以及解决风尘产生机制和搬运路径等问题展开讨论。

关键词: 铀同位素, 破碎年龄, 搬运过程, α衰变反冲, 黄土

The wind dust system is an important part of the terrestrial surface system and plays an important role in many key belts. The mechanism of wind dust and the handling process are important to understand the environmental function of wind dust and to interpret the paleoclimate record. In the past, traditional geochemical methods can only reflect the rock composition or age in the final denudation zone, and it is not possible to distinguish the different silt mechanism and the intermediate process under the same eventual source background, which is one of the biggest challenges of the present research. The 234U/238U ratio of fine matter caused by alpha decay recoil reflects the time experienced by the particle since it was broken and may be able to effectively trace the mechanism of wind dust generation and the transport of the intermediate process, but the age of uranium isotope fragmentation is rarely used in the wind dust system. The complicated factors restricting the wide application of uranium isotope were summarized, and according to the latest research progress, the verification and development of the uranium isotope comminution age in the wind dust system, and the problem solution of the mechanism of wind dust production and the way of transporting were discussed.

Key words: Uranium isotope, Comminution age, Transportation process, α-recoil, Loess

中图分类号: 

图1 颗粒铀同位素衰变图
(a)颗粒α衰变反冲作用示意图;(b) 颗粒表面( 234U/ 238U)与破碎年龄 t com演化图(据参考文献[ 40 ]修改)
Fig.1 Diagram showing radioactive decay of Uranium isotope
(a) Schematic diagram of recoil ejection of 234Th from a spherical grain as a result of the alpha decay of 234U, followed by beta decay of 234Th to 234U;(b)The time dependent (since the onset of weathering) evolution of ( 234U/ 238U) as a function of sediment grain size (modified after reference[40])
图2 反冲系数 f α值与颗粒粒度的关系 [ 21 ]
CLP:黄土高原;Hanford:华盛顿Hanford花岗质冲积物; Site 984:北大西洋984钻点钻孔; Dome C:南极冰芯Dome C;KRF:加州Kings河冲积扇; OT:冲绳海槽
Fig.2 Dependence of recoil fraction ( f α ) on grain-size [ 21 ]
CLP. Chinese Loess Plateau; Hanford.Granitic fluvial sediments in Hanford,Washington; Site 984.Drill site 984 in North Atlantic; Dome C. Antarctic Dome C ice core (Site 984); KRF. Alluvial fan of Kings River,California; OT. Okinawa Trough
图3 碎屑颗粒的( 234U/ 238U)分区图(据参考文献[ 15 ]修改)
Fig.3 Distribution of ( 234U/ 238U) in the detritus grain (modified after reference[15])
图4 化学清洗程度与颗粒( 234U/ 238U)演化示意图(据参考文献[ 51 ]修改)
Fig.4 Schematic of the expected effects of leaching treatments on the 234U/ 238U activity ratio of sediment samples (modified after reference[51])
图5 SSB方法下的整套实验流程基于老黄土样品的( 234U/ 238U)及其误差的长期重复性 [ 21 ]
Fig.5 Long-term reproducibility and analytical uncertain-ties of the whole procedure using SSB method based on one loess sample of >1 Ma [ 21 ]
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