扬子陆块西北缘早新元古代俯冲增生过程的岩浆记录

吴鹏; 张少兵; 郑永飞; 张小菊; 徐争启; 施泽明

doi:10.19826/j.cnki.1009-3850.2024.01005

扬子陆块西北缘早新元古代俯冲增生过程的岩浆记录

1.
成都理工大学地球科学学院，四川　成都　610059

2.
成都理工大学地球勘探与信息技术教育部重点实验室，四川　成都　610059

3.
中国科学院壳幔物质与环境重点实验室，中国科学技术大学地球和空间科学学院，安徽　合肥　230026

基金项目: 国家自然科学基金项目（41973002，41772187）；成都理工大学珠峰科学研究计划项目（2023ZF11413）

详细信息

作者简介: 吴鹏（1991—），男，研究员，博士，主要从事前寒武纪地质学、火成岩地球化学和氮同位素地球化学研究。E-mail：pengwu@cdut.edu.cn

中图分类号: P534.1

收稿日期: 2023-12-28

修回日期: 2024-01-13

录用日期: 2024-02-26

刊出日期: 2024-03-31

Magmatic record of early Neoproterozoic subduction-accretion in the northwestern margin of the Yangtze Block, South China

1.
College of Earth Sciences, Chengdu University of Technology, Chengdu 610059, China

2.
Key Laboratory of Earth Exploration and Information Techniques of the China Ministry of Education, Chengdu University of Technology, Chengdu 610059, China

3.
CAS Key Laboratory of Crust-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China

Received Date: 28 December 2023

Revised Date: 13 January 2024

Accepted Date: 26 February 2024

Publish Date: 31 March 2024

摘要

摘要:
华南早新元古代俯冲相关岩浆作用记录为揭示罗迪尼亚超大陆边缘陆块的聚合及增生过程提供了重要制约。本文聚焦华南扬子陆块西北缘出露的早新元古代岩浆作用记录，总结梳理了其年代学框架、地球化学特征以及同位素特征，查明了其源区性质和岩石学成因、并探讨了不同阶段岩浆记录所对应的构造环境。结果表明，扬子陆块西北缘约1.0~0.9 Ga岩石具有与新生岛弧岩浆类似的微量元素特征，强不相容元素的含量略低于大陆弧，并且具有亏损的Sr-Nd-Hf同位素组成和略低于地幔值的锆石δ¹⁸O值，这些特征指示约1.0~0.9 Ga岩浆岩最有可能形成于洋内弧环境。相比之下，约0.9~0.83 Ga岩浆岩具有与平均上地壳类似的微量元素特征，富集强不相容元素和轻稀土元素，亏损高场强元素，并且具有富集的Sr-Nd-Hf同位素组成，锆石δ¹⁸O值与地幔值相当或略高，指示其可能形成于大陆弧环境。此外，镁铁质岩石全岩Nd和锆石Hf同位素随年龄的长期变化趋势揭示了地幔源区性质周期性地富集和亏损，这可能是由于俯冲带间歇性地前进和后撤引起的挤压–伸展构造体制的不断交替所致。本文结果为扬子陆块西北缘新元古代早期的构造演化历史和俯冲增生动力学机制提供了制约。
- 洋内弧 /
- 活动大陆边缘弧 /
- 早新元古代 /
- 罗迪尼亚 /
- 扬子陆块 /
- 华南
Abstract:
Early Neoproterozoic subduction-related magmatism in South China provides an important constraint for revealing the amalgamation and accretion of marginal blocks in Rodinia. Herein, we focus on the early Neoproterozoic igneous rocks exposed in the northwestern margin of the Yangtze block, South China. After compiling the geochronological data, geochemical characteristics, and isotopic compositions of early Neoproterozoic igneous rocks, the nature of source, petrogenesis, and the tectonic settings were addressed. The results show that the igneous rocks with ages of about 1.0 to 0.9 Ga have trace element compositions similar to island arc basalts with highly incompatible elements slightly lower than continental arcs, depleted Sr-Nd-Hf isotope compositions and zircon δ¹⁸O values slightly lower than mantle values, suggesting a likely intra-oceanic subduction origin. By comparison, the magmatic rocks with ages of about 0.9 to 0.83 Ga have pronounced enrichment in LILEs and LREEs, significant depletion in HFSE, moderately enriched Sr-Nd-Hf isotopes and zircon δ¹⁸O values fall in or higher than mantle range, which suggests that they were most probably formed in a continental arc setting. The secular variation trends of whole-rock Nd and zircon Hf isotopes in mafic rocks reveal the periodic enrichment and depletion of mantle caused by repeatedly advancing and retreating subduction, which further triggers alternating regimes of contraction and extension tectonics. The results depict the early Neoproterozoic subduction accretion history in the northwestern margin of the Yangtze block.
- intra-oceanic arc /
- active continental margin arc /
- Early Neoproterozoic /
- Rodinia /
- Yangtze block /
- South China

HTML全文

图 1 扬子陆块西北缘地质简图以及新元古代早期岩浆岩的分布图（年龄统计和参考文献见附表1）

Figure 1.

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图 2 扬子西北缘1.0~0.9 Ga火成岩的岩石学分类图解及蛛网图

Figure 2.

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图 3 扬子西北缘0.9~0.83 Ga火成岩的岩石学分类图解及蛛网图

Figure 3.

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图 4 扬子西北缘早新元古代岩浆岩的全岩ε_Nd(t)、锆石ε_Hf(t)和δ¹⁸O值与锆石U-Pb年龄图解

Figure 4.

下载: 全尺寸图片幻灯片

图 5 扬子西北缘早新元古代构造演化图

Figure 5.

下载: 全尺寸图片幻灯片

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扬子陆块西北缘早新元古代俯冲增生过程的岩浆记录

1. 成都理工大学 地球科学学院，四川 成都 610059 2. 成都理工大学 地球勘探与信息技术教育部重点实验室，四川 成都 610059 3. 中国科学院壳幔物质与环境重点实验室，中国科学技术大学 地球和空间科学学院，安徽 合肥 230026

作者简介: 吴鹏（1991—），男，研究员，博士，主要从事前寒武纪地质学、火成岩地球化学和氮同位素地球化学研究。E-mail：pengwu@cdut.edu.cn

Magmatic record of early Neoproterozoic subduction-accretion in the northwestern margin of the Yangtze Block, South China

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