花岗岩岩石地球化学

内蒙古固阳县花岗岩岩石地球化学特征

摘要

研究内蒙古固阳县二叠纪侵入的花岗岩的化学组成，包含其成分的来源、含量、分布、种类及化学变化。

岩石地球化学是近代岩石学和地球化学的交叉学科。研究各类岩岩石中的主量元素、微量元素和同位素，用于探讨岩石源区、岩石成因、岩石演化和岩石产出的构造环境等方面基础理论问题。

本区岩浆活动从色尔腾山期到燕山期均有，以侵入活动为主，喷发活动主要集中于中元古代白云鄂博期，为一套中酸性—基性火山岩建造，另外还广泛发育一套钾玄岩。侵入岩类型齐全，分布广，侵入于白云鄂博群中，接触带普遍混合岩化，该区出露的岩浆岩，按成分可分为超基性岩、碱性基性岩类和酸性岩类。

火成碳酸岩的最大岩体为赋矿白云石碳酸岩体，其次为侵入的碳酸岩墙。酸性岩类包括中粗粒黑云母花岗岩、角闪石黑云母花岗岩、细粒黑云母花岗岩及酸性岩脉；而黑云母花岗岩与二长花岗岩主要呈岩基状侵位。将本区闪长质一花岗质岩石侵位时代归为泥盆纪、二叠纪、三叠纪以及侏罗纪等多期次。

关键词：内蒙古；固阳县；二叠纪；岩石地球化学

Inner Mongolia Guyang County granite rock geochemistry

Abstract

Chemical composition of Inner Mongolia County of Guyang Permian intrusive granite, contains the source, content, distribution, types and chemical changes.

Rock geochemistry is a cross subject of modern petrology and geochemistry. Research on various types of rock in the major elements, trace elements and isotopes, for the basic theoretical problems of rock source area, rock genesis, evolution of rock and rock the tectonic environment.

The magmatic activity of this area from the SERTENGSHAN period to Yanshan period are mainly intrusive activities, volcanic activity, mainly in the Mesoproterozoic Baiyunebo period, built as a set of acid - base volcano rock, also widely developed a set of shoshonite. Intrusive rock types, wide distribution, invasion to Baiyunebo group, contact with widespread migmatization, the area exposed magmatic rocks, components can be divided according to ultramafic rocks, mafic alkaline and acidic rocks.

The largest igneous rock in carbonate rocks for ore-bearing dolomite carbonatites, followed by the carbonatite dyke intrusion. Acidic rocks including coarse grained biotite granite, hornblende biotite granite, fine grained biotite granite and acidic dikes; and biotite granite and granite batholith two mainly in the form of emplacement. The dioritic a granitic rock emplacement age of Devonian, Permian, Triassic to Jurassic period. etc.

Key words：Inner Mongolia; Guyang County; Permian; rock geochemistry

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目录

摘要.................................................................................................................................................................I Abstract..........................................................................................................................................................II 1 绪论. (1)

1.1 选题依据及前人研究基础 (1)

1.2 选题的目的和意义 (1)

1.3 国内花岗岩研究新进展 (1)

1.4 花岗岩研究的新趋向 (1)

1.4.1 “动力学”研究与基础地质 (2)

1.4.2岩石地球化学 (2)

1.5 完成的工作量 (2)

2 区域地质背景 (3)

2.1 区域地质概况 (3)

2.2 花岗岩种类及构造特征 (3)

3花岗岩形成及其大地构造环境 (5)

3.1花岗岩与大地构造的成因联系 (5)

3.2花岗岩的构造成因分类 (6)

3.3花岗岩的物质成分演化趋势 (7)

4 研究区花岗岩岩石特征 (8)

4.1 花岗岩样本采集地点 (8)

4.2 岩石薄片镜下鉴定及分析 (9)

4.2.1镜下鉴定 (9)

4.2.2 镜下鉴定分析 (16)

结论 (17)

致谢 (19)