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

陈虹; 王宏晖; 包国栋

doi:10.12090/j.issn.1006-6616.2021.27.05.065

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

doi: 10.12090/j.issn.1006-6616.2021.27.05.065

陈虹^{1, 2, 3,},
王宏晖¹,
包国栋¹

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
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- 被引次数: 0
出版历程
- 收稿日期: 2021-06-13
- 修回日期: 2021-08-31
- 预出版日期: 2021-12-31
- 刊出日期: 2021-10-28

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

CHEN Hong^{1, 2, 3
,},
WANG Honghui¹,
BAO Guodong¹

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

Funds:

the National Natural Science Foundation of China 41941004

Chinese Polar Environment Comprehensive Investigation # Assessment Programs CHINARE 2016-02-05

the Geological Investigation Project of China Geological Survey DD20160060

摘要

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。
- 罗斯运动 /
- 碎屑锆石 /
- 冰下地质 /
- 北维多利亚地 /
- 南极
Abstract: 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.
- Ross Orogeny /
- detrital zircon /
- subglacial geology /
- Northern Victoria Land /
- Antarctica

HTML全文

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)

a—罗斯-德拉美造山带构造格架与岩浆年龄分布特征；b—北维多利亚地构造特征与岩浆年龄特征

Figure 1. Geological map of the Ross Orogen and Northern Victoria Land (modified after Estrada et al., 2016; Chen et al., 2019)

(a) Tectonic framework of the Ross-Delamerian orogenic belt and the magmatic age distribution in it; (b) Tectonic features and magmatic age in Northern Victoria Land

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)

a—难言岛周边地区地貌特征；b—难言岛综合地貌特征

Figure 2. The location and geomorphological map of the Inexpressible Island and its surrounding areas (The aerial orthophoto map was provided by the Polar Mapping Engineering Center of Heilongjiang Bureau of Surveying and Mapping Geographic Information)

(a) Geomorphological features around the Inexpressible Island; (b) Geomorphological features of the Inexpressible Island

下载: 全尺寸图片幻灯片

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. Geological characteristics of the bedrocks and Quaternary deposits in the middle U-shaped valley area of the Inexpressible Island

下载: 全尺寸图片幻灯片

图 4 难言岛地区松散堆积物砾石组成与结构特征

Figure 4. Gravel composition and structural characteristics of Quaternary deposits in the Inexpressible Island

下载: 全尺寸图片幻灯片

图 5 典型碎屑锆石CL图像及其U-Pb年龄

Figure 5. Cathodoluminescenc images of typical detrital zircons and their U-Pb ages

下载: 全尺寸图片幻灯片

图 6 锆石年龄直方图

Figure 6. Zircon age histogram diagram

下载: 全尺寸图片幻灯片

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. Chondrite-normalized REE patterns of detrital zircons and comparison of characteristics between magmatic and hydrothermal zircons(Normalization values were after Sun and McDonough, 1994; Typical magmatic and hydrothermal zircon datas were obtained from Hoskin, 2005)

下载: 全尺寸图片幻灯片

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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