| 胶辽吉地区古元古代早期花岗岩的侵位模式及其与隆滑构造的关系 |
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| 引用本文： | 李三忠,杨振升.胶辽吉地区古元古代早期花岗岩的侵位模式及其与隆滑构造的关系[J].岩石学报,1997,13(2):189-202. |
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| 作者姓名： | 李三忠 杨振升 |
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| 作者单位： | 西北大学地质系，长春地质学院地球科学系 |
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| 摘 要： | 通过对胶辽吉地区古元古代裂谷带的深入研究，提出了伸展构造环境下中深部地壳花岗质岩浆侵位的一种模式，即花岗质岩浆沿基底与盖层之间的拆离滑脱带多次贯入，形成岩席，之后随着地壳拉伸（或伸展）作用，这些岩席逐渐远离侵位中心，发生侧向迁移。这种大陆壳内中深部花岗质岩浆的侵位和地壳的侧向伸展的模式，与有些学者提出的大洋中脊玄武质岩浆的侵位和洋壳扩张的模式是基本相似的。这一模式也是大陆地壳快速生长加厚的一种有效机制。由于花岗质岩浆的上涌引起上覆盖层因重力失稳形成一系列顺层滑脱构造组合。它们与花岗岩和基底共同构成中深构造层次岩浆隆起－顺层分层滑脱构造系
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| 关 键 词： | 中深部地壳 花岗岩 侵位模式 隆－滑构造 |
Emplacement Model of Palaeoproterozoic Early Granite in Jiao Liao Ji Area and Its Relation to the Uplift Bedding Delamination Structural Series |
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| Li Sanzhong,Yang Zhensheng,Liu Yongjiang and Liu Junlai.Emplacement Model of Palaeoproterozoic Early Granite in Jiao Liao Ji Area and Its Relation to the Uplift Bedding Delamination Structural Series[J].Acta Petrologica Sinica,1997,13(2):189-202. |
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| Authors: | Li Sanzhong Yang Zhensheng Liu Yongjiang and Liu Junlai |
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| Abstract: | Based on study of Palaeoproterozoic palaeo rift of Jiao Liao Ji area,an emplacement model of granitoid magmas in mid and deep crust under extension is proposed here, i.e. multiple injected granitoid magmas emplaces along detachment surface or cover/basement interface and migrates gradually far away from emplacement center. The model of granitoid magmas emplacement and crustal extension in mid or deep crust likes that of mid ocean ridge mafic magmas emplacement and oceanic spreading exactly. It is perhaps an efficient mechanism of rapid crustal growth. A series of bedding slide structures (or bedding delamination structural series) are derived from gravitational instability of overlayered sedimendary cover coeval with granitoid magmas upwelling. We call structural assemblage of cover, basement or granite (core) and contact plane between cover and core as uplift bedding delamination structural series (UBDS). |
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| Keywords: | Middle and deep crust Granite Emplacement model Uplift bedding delamination structure |
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