An Overview on Continental Extensional Tectonics
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摘要: 简述了大陆伸展构造的研究历史,并从基本概念、构造样式、变形机制和动力背景等方面对大陆伸展构造进行了综述.伸展是大陆构造一种主要类型,并以正断层为主形成多种构造样式,如地堑、裂谷、拆离断层和变质核杂岩等.大陆伸展的变形机制包括纯剪切、简单剪切及分层剪切模式,并由此产生对称与非对称构造.大陆伸展构造的地表表现形式主要为裂谷或变质核杂岩,两者的形成主要取决于岩石圈的流变学结构.大陆伸展的动力学背景主要包括地幔柱上涌、俯冲板片反转与俯冲带后撤、增厚地壳的重力垮塌以及走滑体系的派生拉张等.Abstract: This paper makes an overview on the continental extensional tectonics from the research history, basic concept, structural pattern, deformational mechanism and dynamic tectonic backgrounds. Extension is one of the major tectonics in continent, which forms many different structural patterns with normal faults, such as, grabens, rifts, detachment faults and metamorphic core complexes (MCC). Deformational mechanism for the continental extension includes models of pure shearing, simple shearing and delaminating shearing, which results in symmetric and asymmetric extensional structures, respectively. There are mainly two kinds of surface expressions for the continental extension, i.e., rifts or MCC, which depends on the rheological structure of the continental lithosphere. The dynamic tectonic backgrounds for continental extension include the upwelling plume, slab rollback and subduction retreat, gravitational collapse of thickened crust, and the extension derived from strike-slip system.
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Key words:
- continental extensional tectonics /
- normal fault /
- rift /
- metamorphic core complex /
- plume /
- subduction zone /
- orogeny /
- tectonics
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图 3 典型拆离断层构造岩组合(a)和拆离断层不同构造部位形成的不同构造岩(b)以及下盘形成的构造岩随时间抬升并叠加的情况(c)
图b, c修改自Lister and Davis(1989)
Fig. 3. Typical tectonite association of a detachment fault (a), tectonite produced at different structural levels (b) and uplifting and superposing of tectonite of lower-plate during extension (c)
图 4 典型的科迪勒拉型变质核杂岩及其形成过程
a.美国科迪勒拉变质核杂岩典型实例——Wipple Mountain变质核杂岩;b.深部初始近水平韧性剪切带将韧性的中-下地壳与脆性的上地壳解耦;c.由拆离剥蚀导致的均衡调节以及岩浆侵位形成的底劈作用引起了下盘隆升形成变质核杂岩的穹窿构造.图a修改于Davis and Lister(1988);图b, c修改于Lister and Davis(1989)
Fig. 4. Typical Cordilleran metamorphic core complex and its formation
图 5 大陆伸展变形的3种基本变形机制
据Lister et al.(1986).a.纯剪切模型; b.简单剪切模型; c.分层剪切模型
Fig. 5. Three models of continental extension
图 6 大陆伸展的窄裂谷(a)、宽裂谷(b)和变质核杂岩模型(c)
Fig. 6. Continental extensional models of narrow rifting (a), wide rifting (b) and metamorphic core complex (c)
图 10 增厚地壳的重力驱动伸展的示意
Fig. 10. Simplified diagram showing extension driven by gravity of thickened crust
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