地学前缘 ›› 2025, Vol. 32 ›› Issue (6): 256-275.DOI: 10.13745/j.esf.sf.2025.10.50

• 岩石成因与效应新探 • 上一篇    下一篇

青藏高原东南缘营盘-金顶-北衙-盘龙剖面地壳结构与化学成分

赵志丹1(), 雷杭山2, 白志明3, 刘栋1, 王珍珍1, 许博4, 苗壮4, 侯增谦5, 莫宣学1   

  1. 1.中国地质大学(北京) 地球科学与资源学院, 地质过程与成矿预测全国重点实验室, 北京 100083
    2.中海油研究总院有限责任公司, 北京 100028
    3.中国科学院 地质与地球物理研究所, 岩石圈演化与环境演变全国重点实验室, 北京 100029
    4.中国地质大学(北京) 珠宝学院, 地质过程与成矿预测全国重点实验室, 北京 100083
    5.中国地质科学院, 深地探测与矿产勘查全国重点实验室, 北京 100037
  • 收稿日期:2025-10-10 修回日期:2025-10-18 出版日期:2025-11-25 发布日期:2025-11-12
  • 作者简介:赵志丹(1968—),男,博士,教授,从事岩石学和地球化学研究。E-mail: zdzhao@cugb.edu.cn
  • 基金资助:
    地球深部探测与矿产资源勘查国家科技重大专项(2025ZD1004800);国家重点研发计划项目(2016YFC0600304);国家创新引智111项目(B18048)

Crustal structure and chemical composition of the Yingpan-Jinding-Beiya-Panlong transect in southeastern Tibetan Plateau

ZHAO Zhidan1(), LEI Hangshan2, BAI Zhiming3, LIU Dong1, WANG Zhenzhen1, XU Bo4, MIAO Zhuang4, HOU Zengqian5, MO Xuanxue1   

  1. 1. State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Resources, China University of Geosciences (Beijing), Beijing 100083, China
    2. CNOOC Research Institute Co. Ltd., Beijing 100028, China
    3. State Key Laboratory of Lithospheric and Environmental Coevolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
    4. State Key Laboratory of Geological Processes and Mineral Resources, School of Gemmology, China University of Geosciences (Beijing), Beijing 100083, China
    5. State Key Laboratory of Deep Earth and Mineral Exploration, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2025-10-10 Revised:2025-10-18 Online:2025-11-25 Published:2025-11-12

摘要:

大陆地壳的结构、组成和演化是地球区别于其他星球的独一无二的重要特征和现今地球科学中最重要的科学问题之一。大陆地壳在地球系统各圈层中扮演着极为重要的角色,是岩石圈与地表圈层相互作用的纽带,也是揭示壳-幔物质与能量交换、岩浆作用和成矿作用等地质过程的重要场所。研究地壳结构、组成和演化的方法主要包括深部物理探测、岩浆携带的深源包体、古老变质岩基底和岩浆作用反演等方法。本文选择青藏高原东南缘呈北西-南东向横穿西南三江造山带-扬子克拉通西缘的主要地质单元,西起云南兰坪县营盘,经过兰坪县金顶、鹤庆县北衙,东至昆明盘龙的地壳剖面(简称营盘-盘龙),开展了剖面宽度50 km走廊带及其邻区的地壳结构和化学成分研究。从构造上穿越了兰坪-思茅地块,横跨金顶矿区、北衙矿区,东至扬子地台西缘。本文基于已有地球物理测深剖面、古老变质岩系、岩浆岩及深源地壳包体和沉积岩盖层的地球化学和年代学数据,应用地球物理、实验岩石学和岩石地球化学资料的联合限制,尝试建立了营盘—盘龙走廊带内各构造单元的地壳岩石组成模型,估算了上、中和下地壳的元素地球化学成分,并探讨了走廊带和邻区各构造单元的地壳演化、构造-岩浆-成矿作用过程。

关键词: 地壳结构, 岩石组成模型, 化学成分, 地壳演化, 扬子克拉通西缘, 青藏高原东南缘

Abstract:

The structure, composition, and evolution of the continental crust represent one of the unique and defining characteristics of Earth, distinguishing it from other planets, and constitute one of the most significant scientific questions in modern Earth sciences. The continental crust plays an indispensable role in various spheres of the Earth system. It serves as a link that facilitates interactions between the lithosphere and surficial layers, and it represents a key site for studying geological processes such as crust-mantle material and energy exchange, magmatism, and mineralization. Research methods for investigating crustal structure, composition, and evolution primarily include probing the physical properties of deep crustal layers, studying deep-seated xenoliths brought to the surface by magmatic activities, analyzing ancient metamorphic basement rocks, and reconstructing magmatic processes. This study focuses on geological transect along a northwest-southeast trending crustal profile, extending from Yingpan in Lanping County, Yunnan Province, through Jinding in Lanping County and Beiya in Heqing County, to Panlong in Kunming, crossing the southeastern margin of the Tibetan Plateau and the western margin of the Yangtze Craton (referred to as the Yingpan-Panlong transect). Comprehensive research on the crustal structure and chemical composition has been conducted along a 50 km-wide transect and its adjacent areas. Structurally, the profile traverses the Lanping-Simao Block, passes through the Jinding and Beiya ore deposits, and extends eastward to the western margin of the Yangtze Craton. Using an existing geophysical depth profile, combined with geochemical and geochronological data from ancient metamorphic complexes, magmatic rocks, deep crustal xenoliths, and sedimentary cover rocks, this paper integrates data from geophysics, experimental petrology, and rock geochemistry. A crustal rock composition model for the geological units within the Yingpan-Panlong transect is proposed. The elemental and isotopic compositions of the upper, middle, and lower crust are estimated, with further discusses on the processes, crustal evolution, tectonic-magmatic activities, and mineralization in the Yingpan-Panlong transect and adjacent regions.

Key words: crustal structure, petrologic model, chemical composition, crustal evolution, western margin of the Yangtze Craton, southeastern Tibetan Plateau

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