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河南四级听力频道是多少
专业资源勘查工程
学生姓名张桃
学号 2
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 disperd 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.
加勒比海盗4美人鱼唱的歌Magmatic deposits is the product of the magma by crystallization and differentiation, and generally have the following properties:
junglegym1、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 same time.And this is typical of syngenetic ore deposits. Few mineralization of the magmatic deposits may be continued to a later time, but generally does not exceed a total period of magmatic activity.
arrogant2、The magmatic deposits ore body majority prent
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 cas,orebody prenting 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 caus 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 same mineral composition, when the uful minerals of the rock body aggregate and reach a certain size,they become the orebody.
5、The ore of magmatic deposits often
have,disminated,the banded,eye porphyritic,den massive,brecciated and so on,ore structure.The ores structure can be broadly divided into the following categories:捕蛇者说 翻译>高升专报考条件
I.Structure sub-the different magmatic condensate crystalline or stacking interactions; II.Reflect the structure of the immiscible fluid crystallization process III.Reflect the
held
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 uful 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富爸爸 穷爸爸
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 compod 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 divided into three types.
b)Mineral deposits associated with syenite, nepheline syenite and carbonate igneous complex
Relating to magmatic deposits of the rocks are mostly produced with the form of rock strain,the different components of rock mass facies zone often has ring distribution.offshore
II.The 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.
>考研分数线2013
