中国沙漠 ›› 2024, Vol. 44 ›› Issue (3): 231-246.DOI: 10.7522/j.issn.1000-694X.2023.00109
• • 上一篇
韩晓雨1(), 迟云平1,2(
), 谢远云1,2, 康春国3, 吴鹏1, 汪烨辉1, 孙磊1, 魏振宇1
收稿日期:
2023-09-13
修回日期:
2023-12-04
出版日期:
2024-05-20
发布日期:
2024-06-11
通讯作者:
迟云平
作者简介:
迟云平(E-mail: 1982cyp@163.com)基金资助:
Xiaoyu Han1(), Yunping Chi1,2(
), Yuanyun Xie1,2, Chunguo Kang3, Peng Wu1, Yehui Wang1, Lei Sun1, Zhengyu Wei1
Received:
2023-09-13
Revised:
2023-12-04
Online:
2024-05-20
Published:
2024-06-11
Contact:
Yunping Chi
摘要:
科尔沁沙地是中国北方面积最大的半固定沙地,追踪其物质来源对认识沙地/沙漠的形成演化和重建碎屑物质的迁移路径至关重要。为此,本研究对科尔沁沙地风成沙的细颗粒组分(<63 μm和<11 μm)进行了岩石学分析、元素地球化学分析、Sr-Nd同位素分析、TIMA自动化矿物识别以及碎屑锆石U-Pb测年分析,全面表征科尔沁沙地物质组成并对其物源进行定量约束。结果表明:科尔沁沙地经历了较低的化学风化,分选和再循环的程度较低。重矿物组合以钛铁矿、绿帘石、锆石、石榴子石、磁铁矿+赤褐铁矿为主,与地球化学母岩判别图解共同指示科尔沁沙地沉积物主要来自中酸性岩浆母岩。Sr-Nd同位素进一步约束主要源区为中亚造山带南缘和华北克拉通北缘,少量粉尘来源于中国北方边界沙漠。沙地的碎屑锆石U-Pb年龄集中在中生代至晚古生代(200~600 Ma)和古元古代(1 518~2 000 Ma、2 200~2 600 Ma)。与潜在源区锆石年龄谱的对比显示,科尔沁沙地细颗粒组分既有来自中亚造山带南缘大兴安岭经风力搬运和河流搬运而来的近源物质供给,也有经河流搬运自华北克拉通北缘燕山山脉出露的古老基岩。逆向蒙特卡罗模型的定量物源结果显示中亚造山带的贡献占53.7%、华北克拉通贡献占46.3%。风与河流的共同作用解释了科尔沁沙地风成沙细颗粒组分的形成。
中图分类号:
韩晓雨, 迟云平, 谢远云, 康春国, 吴鹏, 汪烨辉, 孙磊, 魏振宇. 科尔沁沙地风成细沙的物质组成特征及其对物源的指示[J]. 中国沙漠, 2024, 44(3): 231-246.
Xiaoyu Han, Yunping Chi, Yuanyun Xie, Chunguo Kang, Peng Wu, Yehui Wang, Lei Sun, Zhengyu Wei. Material composition characteristics of fine particles of eolian sand in Horqin Sandy Land and its indication to provenance[J]. Journal of Desert Research, 2024, 44(3): 231-246.
样品 | 钛铁矿 | 绿帘石 | 锆石 | 赤铁矿/磁铁矿 | 铁铝榴石 | 榍石 | 金红石 | 石英 | 独居石 | 磷灰石 |
---|---|---|---|---|---|---|---|---|---|---|
Q1 | 27.06 | 20.96 | 9.72 | 8.64 | 6.09 | 5.91 | 3.07 | 1.16 | 0.13 | 0.13 |
Q2 | 35.36 | 10.16 | 15.49 | 5.14 | 13.01 | 4.01 | 3.03 | 0.66 | 0.22 | 0.06 |
Q4 | 33.52 | 11.20 | 15.22 | 2.75 | 14.03 | 4.48 | 3.50 | 1.50 | 0.33 | 0.10 |
Q5 | 28.87 | 14.84 | 11.51 | 14.92 | 6.45 | 4.34 | 2.60 | 1.11 | 0.39 | 0.12 |
Q7 | 34.83 | 9.89 | 18.68 | 3.88 | 10.03 | 4.08 | 3.16 | 2.93 | 0.37 | 0.05 |
平均值 | 31.928 | 13.41 | 14.124 | 7.066 | 9.922 | 4.564 | 3.072 | 1.472 | 0.288 | 0.092 |
表1 科尔沁沙地<63 μm组分的沉积物TIMA自动定量矿物含量 (%)
Table 1 Automatic quantitative mineral content results of TIMA of <63 μm components in Horqin Sandy Land
样品 | 钛铁矿 | 绿帘石 | 锆石 | 赤铁矿/磁铁矿 | 铁铝榴石 | 榍石 | 金红石 | 石英 | 独居石 | 磷灰石 |
---|---|---|---|---|---|---|---|---|---|---|
Q1 | 27.06 | 20.96 | 9.72 | 8.64 | 6.09 | 5.91 | 3.07 | 1.16 | 0.13 | 0.13 |
Q2 | 35.36 | 10.16 | 15.49 | 5.14 | 13.01 | 4.01 | 3.03 | 0.66 | 0.22 | 0.06 |
Q4 | 33.52 | 11.20 | 15.22 | 2.75 | 14.03 | 4.48 | 3.50 | 1.50 | 0.33 | 0.10 |
Q5 | 28.87 | 14.84 | 11.51 | 14.92 | 6.45 | 4.34 | 2.60 | 1.11 | 0.39 | 0.12 |
Q7 | 34.83 | 9.89 | 18.68 | 3.88 | 10.03 | 4.08 | 3.16 | 2.93 | 0.37 | 0.05 |
平均值 | 31.928 | 13.41 | 14.124 | 7.066 | 9.922 | 4.564 | 3.072 | 1.472 | 0.288 | 0.092 |
图4 科尔沁沙地沉积物Sr-Nd同位素组成注:Sr-Nd同位素数据引自文献[9,38-40];NBC为中国北方边界附近干旱区;NMPT为青藏高原北缘干旱区;OD为鄂尔多斯干旱区;NCC为华北克拉通;CAOB为中亚造山带
Fig.4 Sr-Nd isotopic composition of sediments from the Horqin Sandy Land
图9 科尔沁沙地与潜在物源区碎屑锆石U-Pb年龄谱对比图注:中亚造山带锆石年龄数据引自文献[84,86-99];华北克拉通锆石年龄数据引自文献[100-111]
Fig.9 Comparison of U-Pb age spectrum of clastic zircon in the Horqin Sandy Land and potential source area
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