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图为侵入岩体顶部接触带的局部,可以将它看作一个岩浆热液矿床的微缩模型。岩浆及热液侵入于长石石英岩屑杂砂岩中,岩体及外接触带都发生了硅化、高岭石化等热液蚀变。在侵入体内有网脉状及囊状的磁铁矿矿体产出,而在岩枝的顶端形成了致密块状的磁铁矿矿体。标本的主体为凝灰质板岩,中部为凝灰岩夹层。凝灰岩及其两侧的围岩具有明显的绿泥石化现象。详细观察表明,岩石没有成岩期后的构造裂隙和脉体穿入,绿泥石化与凝灰岩层密切相关。由此可以推测:水下火山喷发的沉积物将与一定量的气液流体一同被上覆
The picture shows a part of the contact zone at the top of the intrusive body and can be seen as a miniature model of a magmatic hydrothermal deposit. Magmatic and hydrothermal fluids intruded into feldspathic quartz cuttings and the hydrothermal alteration of silicification, kaolinite and petrochemistry occurred in both the outer and intrusion zones. There are reticular and cystic magnetite ore bodies invaded in the body, while dense, massive magnetite ore bodies are formed at the top of the rock branches. The main body of the specimen is tuffaceous slate, and the middle is tuff intercalation. Tuff and its surrounding rock have obvious chloritization phenomenon. Detailed observations show that the rocks did not have tectonic fissures and veins penetrating after diagenesis, and chloritization was closely related to tuff formation. It can be speculated that: the sediment of underwater volcanic eruption will be covered with a certain amount of gas-liquid fluid