THE EMPLACEMENT MECHANISM AND CONTINENTAL DYNAMICS EVOLUTION OF INDOSINIAN INTRUSIVE ROCKS IN EAST LIAONING PENINSULA
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摘要: 辽东半岛广泛分布印支期侵入岩,作为研究辽东半岛印支期陆内造山作用的客观实体,意义重大.概述了印支期侵入岩地质特征、岩石化学及地球化学特征,总结出岩浆演化趋势由超基性→基性→中性→酸性→碱性.提出了岩浆源区性质为幔源、壳幔混源、壳源3种类型.总结了造山初期至造山早期伸展机制下席状侵位,造山主期穹隆式及穿刺式侵位,造山后构造崩塌被动侵位3种侵位机制模式及岩浆大陆动力学演化过程.Abstract: The Indosinian intrusive rocks are broadly distributed in East Liaoning Peninsula. Based on the study on the geology, petrochemistry and geochemistry of the intrusive rocks, it is concluded that the evolution of the source magma is in the trend of uhrabasie→basic→intermediate→acid→alkaline. The source types of the magma are mantle source,crust-mantle mixture and crust source. The continental dynamic evolution process of magma involves three periods under three emplacement mechanism patterns, that is, the sheeted emplacement in the extensional mechanism from the initial to early period of orogeny, the doming and piercing emplacement in the main period of orogeny, and the passive emplacement of tectonic collapse in post-orogeny period.
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