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冈瓦纳大陆边缘罗斯运动的岩浆活动时代：来自北维多利亚地松散沉积物锆石年龄的证据

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陈虹, 王宏晖, 包国栋. 2021. 冈瓦纳大陆边缘罗斯运动的岩浆活动时代：来自北维多利亚地松散沉积物锆石年龄的证据. 地质力学学报, 27(5): 796-808. doi: 10.12090/j.issn.1006-6616.2021.27.05.065
引用本文: 陈虹, 王宏晖, 包国栋. 2021. 冈瓦纳大陆边缘罗斯运动的岩浆活动时代：来自北维多利亚地松散沉积物锆石年龄的证据. 地质力学学报, 27(5): 796-808. doi: 10.12090/j.issn.1006-6616.2021.27.05.065
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CHEN Hong, WANG Honghui, BAO Guodong. 2021. Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin. Journal of Geomechanics, 27(5): 796-808. doi: 10.12090/j.issn.1006-6616.2021.27.05.065
Citation: CHEN Hong, WANG Honghui, BAO Guodong. 2021. Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin. Journal of Geomechanics, 27(5): 796-808. doi: 10.12090/j.issn.1006-6616.2021.27.05.065
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冈瓦纳大陆边缘罗斯运动的岩浆活动时代：来自北维多利亚地松散沉积物锆石年龄的证据

  • 1.

    中国地质科学院地质力学研究所, 北京 100081

  • 2.

    中国地质调查局极地地学研究中心, 北京 100081

  • 3.

    自然资源部古地磁与古构造重建重点实验室, 北京 100081

  • 基金项目:
    国家自然科学基金（41941004）；极地专项项目（CHINARE 2016-02-05）；中国地质调局地质调查项目（DD20160060）
详细信息
    作者简介: 陈虹(1982-), 男, 副研究员, 主要从事区域构造与大陆变形研究。E-mail: chhzxm8281@163.com

  • 中图分类号: P597.3

Detrital zircon age from the glacial and littoral deposit, Northern Victoria Land, Antarctica: Implications for the timing of magmatic activity of the Ross Orogeny on the Gondwana continental margin

  • 1.

    Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

  • 2.

    Reasearch Center of Polar Geosciences, China Geological Survey, Beijing 100081, China

  • 3.

    Key Laboratory of Paleomagnetism and Tectonic Reconstruction of Ministry of Natural Resources, Beijing 100081, China

  • Fund Project: This research is financially supported by the National Natural Science Foundation of China (Grant No. 41941004), the Chinese Polar Environment Comprehensive Investigation # Assessment Programs (Grant No. CHINARE 2016-02-05), and the Geological Investigation Project of China Geological Survey (Grant No. DD20160060)

    摘要

  • 横穿南极大陆中部的横贯南极山脉是早古生代时期古太平洋向东冈瓦纳活动大陆边缘俯冲形成的罗斯造山带，该阶段的地层沉积、变形变质以及花岗质岩浆侵入代表了罗斯运动的演化过程。由于岩浆活动与沉积地层和变形变质在时代上存在明显差异，罗斯运动的时代仍缺乏精确的限定。通过采集北维多利亚地难言岛地区冰碛物和海岸沉积物中的松散砂砾石样品，并进行碎屑锆石U-Pb测年得出：4件不同粒径的冰碛物和海岸沉积样品中的碎屑锆石年龄峰谱具有单一峰谱的特征，年龄区间为2443~323 Ma，主要集中于530~450 Ma之间，峰值年龄约为485 Ma；锆石Th/U比值均大于0.1，而且以＞0.4为主，其CL图像也具有明显的振荡环带，稀土元素特征主体具有岩浆锆石的特征，反映了样品物源区岩浆活动的时代特征。碎屑锆石年龄组成与周缘地区岩浆活动和陆内变形以及沉积地层时代基本一致，表明北维多利亚地及其周缘地区在罗斯运动晚期陆内变形阶段的岩浆活动应持续至450 Ma，这可能代表了罗斯运动结束的时代，该结果为冈瓦纳大陆边缘罗斯运动的构造演化过程提供了新的约束。

    The Transantarctic Mountains across the central Antarctic continent are the Ross orogenic belt formed by westward subduction of the Paleo-Pacific underneath the East Gondwana active continent margin in the early Paleozoic. The sedimentary, deformation and metamorphism, and granitic magmatic intrusion in this stage represent the process of the Ross Orogeny. Due to the significant difference in age among the three elements mentioned above, there is no precise time defined on the Ross Orogeny. In this paper, detrital zircon U-Pb dating of gravel and sand samples from moraines and coastal sediments in the Inexpressible Island of Northern Victoria Land was carried out. The ages of four samples with different gravel diameters range from 2443 to 323 Ma and are mainly concentrated between 530~450 Ma, with a peak age of~485 Ma. Most of the zircons show oscillatory zoning in CL images and have Th/U ratios great than 0.1 (mainly>0.4), with REE characteristics indicating a magmatic origin. Therefore, these ages reflect the timing of magmatic activity in the provenance of the loose sediment samples. The age composition of detrital zircons is consistent with the age of magmatic intrusion, intracontinental deformation and depositional stratigraphy in the surrounding areas, suggesting that the magmatic activity in the Northern Victoria Land and its surrounding areas might have lasted up to 450 Ma in the intracontinental deformation stage, which may represent the end time of the Ross Orogeny. These results provide a new constraint for the tectonic evolution of the Ross Orogeny on the Gondwana continental margin.

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  • 图 1  罗斯造山带与北维多利亚地地质简图(据Estrada et al., 2016；Chen et al., 2019修改)

    Figure 1. 

    下载: 全尺寸图片 幻灯片

    图 2  难言岛及周边地区综合地貌图(航空正射影像图由黑龙江测绘地理信息局极地测绘工程中心提供)

    Figure 2. 

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    图 3  难言岛中部U形谷地区基岩和松散堆积物地质特征

    Figure 3. 

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    图 4  难言岛地区松散堆积物砾石组成与结构特征

    Figure 4. 

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    图 5  典型碎屑锆石CL图像及其U-Pb年龄

    Figure 5. 

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    图 6  锆石年龄直方图

    Figure 6. 

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    图 7  碎屑锆石稀土配分曲线与岩浆锆石和热液锆石特征对比图(标准化值据Sun and McDonough, 1989；典型岩浆锆石和热液锆石数据来源于Hoskin, 2005)

    Figure 7. 

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    表 1  难言岛表层松散物碎屑锆石样品及年龄特征

    Table 1.  Detrital zircon samples and their age characteristics of surface Quaternary deposits in the Inexpressible Island

    序号 样品编号 经纬度 沉积类型 砂样粒径(目/μm) 测点数量(谐和度＞90%/全部测点) 最小/最大年龄值/Ma 其他年龄峰值/Ma
    1 VC 161/1 S74°54′51.3″; E163°42′18.3″ 冰碛物 5~12/1400~4000 58/60 323/2440 ~494
    2 VC 161/2 S74°54′51.3″; E163°42′18.3″ 冰碛物 >12/ < 1400 56/60 421/517 ~474
    3 VC 163/1 S74°54′49.1″; E163°42′57.0″ 海岸堆积 5~12/1400~4000 57/60 414/568 ~476
    4 VC 163/2 S74°54′49.1″; E163°42′57.0″ 海岸堆积 >12/ < 1400 60/60 458/2443 ~489
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