MESOZOIC INTRUSIVE ROCKS IN WESTERN LIAONING: Basic characteristics and their relations to the tectonic movement
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摘要: 辽西地区中生代岩浆活动及构造运动强烈，侵入岩分布广泛，产出形态多样，岩石类型复杂，集中分布于4个北北东向、北东向的侵入岩带内，划分为印支期、燕山早期、燕山晚期3个侵入时期.每个时期岩浆的活动具有由早至晚岩浆物质成分由中基性向酸性演化的特点.岩浆侵入与其所处的独特的地质构造位置有关，岩浆活动的时空分布主要受东西向与北东-北北东向构造体系的制约.中生代岩浆活动的旋回性与地壳活动的多期、多幕性密切相关.岩浆活动可划分6个峰值区段，分别对应于6个构造幕.区域裂陷与挤压作用形成了不同来源、不同成分和不同就位方式的岩浆岩，即不同成因类型花岗岩的物质来源与区域构造环境有密切的联系.Abstract: The Mesozoic magmatic activities and tectonic movements are intensive in Western Liaoning region, with broadly distributed intrusive rocks. The rock bodies, occurring in different forms, with complex types, are concentrated in four NNE-or NE-trending belts. The intrusions are divided into three periods, i.e. Indosinian, Early Yanshanian and Late Yanshanian. In each period, the magma evolved from intermediate-basic to acidic. The distributions of magmatic activities are controlled by the E-W, NE and NNE structural systems. The Mesozoic magmatic cycles are closely related to the multistage and multi-phase of crustal movement. The magmatic activities can be divided into six peak periods, respectively corresponding to the six tectonic phases. The regional fault depression and compression formed the magmatic rock with different sources, compositions and emplacing ways.
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Key words:
- Western Liaoning /
- Mesozoic /
- intrusive rock /
- magmatic activity /
- tectonic movement
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