地质外文文献翻译中英文对照

长安大学资源学院英语文献翻译

学院地球科学与资源学院

专业资源勘查工程

学生姓名张桃________________

学号201127020308 _______________ 指导教师张亚敏___________________

2015年6月18日

Title:Orthomagmatic ore deposits One.Orthomagmatic ore deposits

The magma contains a certain number of metal and volatile components of the silicate melt. All kinds of magma after crystallization and differentiation, make the forming materials dispersed in the magma gathered and formed deposits.And this deposits is called magmatic deposits.

Magmatic deposits formed in the magmatic stage, the source of the material of the deposit is the main ore-bearing magma.

Magmatic deposits is the product of the magma by crystallization and differentiation, and generally have the following properties:

1、Deposits have the mainly relationship with the mafic and ultramafic rocks.And a small number of magmatic deposits with alkaline rocks or magmatic carbonatite-related.

Mineralization and diagenesis often begin at the sametime.And this is typical of syngenetic ore deposits. Fewmineralization of the magmatic deposits may be continued to a later time, but generally does not exceed

a total period of magmatic activity.

2、The magmatic deposits ore body majority present stratiform, lenticular and podiform and so on.And they produced

in the magma body,and the wall rock of containing ore is the mother rock.Few cases,orebody presenting vein and stockwork enter the wall

rock which outside of the mother rock Between the ore body and the wall rock generally is gradual change or rapid gradual change relationship.Only penetration magmatic deposits have the clear boundaries with the wall rock.

3、Except the rare and rare earth elements deposits of the magmatic carbonatite due to special causes have some alteration about the wall rock,the vast majority of magmatic deposits surrounding rock does not have a significant alteration phenomenon.

4、The ore and the wall rock basically have the samemineral composition, when the useful minerals of the rock body aggregate and reach a certain size,they become the orebody.

5、The ore of magmatic deposits often have,disseminated,the banded,eye porphyritic,dense massive,brecciated and so on,ore structure.The ores structure can be broadly pided into the following categories: I.Structure sub-the different magmatic condensate crystalline or stacking interactions; II.Reflect the structure of the immiscible fluid crystallization process III.Reflect the changes in the structure of the physical and chemical

conditions.IV.Epigenetic structure.

6、The magmatic deposits forming temperature is high, generally between 1200 to 700 ° C. The mineralization depth changes,generally formed in the ground a few kilometers to tens of

kilometers.

Tow.The formation conditions of magmatic deposits

Magma deposits are mainly derived from the magma, it is the combined effects of the product by a variety of geological factors, which playing a leading role is the geochemistry of ore-forming elements traits, the magmatic rock conditions, tectonic conditions and physical and chemical conditions and so on.

1、Control the conditions of magmatic rocks formed by

magmatic deposits

Magma is the main provider of the metallogenic material of the magmatic deposits and the medium of containing mineral

medium.Therefore,how much of the content of useful components of magma is the possibility of the formation of magmatic deposits.

I. Magmatic rocks metallogenic specialization

Metallogenic specialization of magmatic rocks in the

genesis of magmatic rocks with endogenous deposits showed regular contact, and specific types of magmatic rocks are often produced specific types of deposits.

a)With mafic and ultramafic intrusive rocks related deposits

Mafic and ultramafic rock is the complex igneous complex formed by the combination of a variety of rock types, rock types from a single rock composed of rock mass is relatively rare.The size of the rock mass

ranging mostly small,and rock strains, rock cover, rock, bedrock is the most common form of the rock mass. With facies and the different combinations,the mafic and ultramafic rocks can be pided into three types.

b)Mineral deposits associated with syenite, nepheline syenite and carbonate igneous complex

Relating to magmatic deposits of these rocks are mostly produced with the form of rock strain,the different components of rock mass facies zone often has ring distribution.

II. T he role of the volatile components in the magma

The magma volatile components have the low melting point,highly volatile and they can delay the condensation rate of the magma, make the magma have more fully differentiation.

III. Magmatic assimilation have an influence on the

mineralization of the magma Deposits

IV. Beyond one period of magma intrusion on control of the mineralization

2、Tectonic conditions that control the formation of magmatic deposits

Tectonics have a major impact on the type of magmatic deposits, distribution, the most magmatic deposits associated with mafic and ultramafic igneous rocks on the Causesand space. Mafic and ultramafic