[1]张信宝.金沙江南流入红河的锆石U-Pb年龄谱物源示踪研究的质疑[J].山地学报,2019,(04):471-474.[doi:10.16089/j.cnki.1008-2786.000439]
　ZHANG Xinbao.Question of Using the Zircon U-Pb Age Technique for Sediment Tracing to Study Whether the Ancient Jinsha River Flew Southward to Joint Red River[J].Mountain Research,2019,(04):471-474.[doi:10.16089/j.cnki.1008-2786.000439]
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金沙江南流入红河的锆石U-Pb年龄谱物源示踪研究的质疑()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2019年04期
页码:
471-474
栏目:
专家观点
出版日期:
2019-07-30

文章信息/Info

Title:
Question of Using the Zircon U-Pb Age Technique for Sediment Tracing to Study Whether the Ancient Jinsha River Flew Southward to Joint Red River
文章编号:
1008-2786-(2019)4-471-04
作者:
张信宝
中国科学院、水利部成都山地灾害与环境研究所,成都 610041
Author(s):
ZHANG Xinbao
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences,Chengdu 610041,China
关键词:
物源示踪方法;  锆石U-Pb年龄谱;  金沙江
Keywords:
zircon U-Pb age;  sediment tracing;  Jinsha River
分类号:
P597~B
DOI:
10.16089/j.cnki.1008-2786.000439
摘要:
Ping Kong等近期发表二篇文章,采用锆石U-Pb年龄谱物源示踪方法,研究得出古金沙江曾经石鼓南流入红河的结论,论文对此提出了质疑。测定U-Pb年龄谱的锆石粒度>0.25 mm,比重4.5 g/cm3左右,为推移质,该技术只适用于较短距离的无湖泊河流的物源示踪研究。将第四纪沉积物和现代河流泥沙的锆石U-Pb年龄谱与大区域岩层的进行对比,分析泥沙来源,研究金沙江河流演化的技术路线存在根本性的缺陷。
Abstract:
In this paper, a hypothesis was challenged, of which the ancient Jinsha River used to flow southward at Shigu, not eastward as present, to joint the Red River, which was asserted in Ping Kong's two papers by using the zircon U-Pb age for sediment tracing. It is well known that the zircon mineral grains for U-Pb age analysis are narrowly applicable to bed-loading sediment. This is because the particle sizes for U-Pb age analysis are usually greater than 0.25 mm and their density is about 4.5 g/cm3; therefore, the technique is only suitable for sediment tracing with a relative short transportation distance in rivers other than those in lakes. The technique has fundamental deficiencies for a study of the Jinsha river evolution by merely comparisons of the zircon U-Pb ages of the sands between quaternary or present river sediments and regional rocks in a large area.

参考文献/References:

[1] 张信宝, 刘彧, 王世杰, 等. 黄河、长江的形成演化及贯通时间[J]. 山地学报, 2018, 36(5): 661-668.[ZHANG Xinbao, LIU Yu, WANG Shijie, et al. On the chronology of the Yellow Rivers and the Yangtze Rivers[J]. Mountain Research, 2018, 36(5): 661-668]
[2] 任美锷, 包浩生, 韩同春, 等. 云南西北部金沙江河谷地貌与河流袭夺问题[J]. 地理学报, 1959, 25(2): 135-155.[REN Meie, BAO Haosheng, HAN Tongchun, et al. Geomorphology of the Jinsha River valley and its river capture in northwestern Yunnan[J]. Acta Geographica Sinica, 1959, 25(2):135-155]
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备注/Memo

备注/Memo:
收稿日期(Received date):2019-07-20; 改回日期(Accepted date):2019-08-02
基金项目(Foundation item):国家自然科学基金项目(41873025,91747207,41771023)。[National Nature Science Foundation of China(41873025, 91747207, 41771023)]
作者简介(Biography):张信宝(1946-),男,研究员,主要研究方向:土壤侵蚀与水土保持。[ZHANG Xinbao(1946-), male, professor, research on soil erosion, water and soil conservation.] E-mail: zxbao@ imde.ac.cn.
更新日期/Last Update: 2019-07-30