混染作用

辉绿岩具有富集型Nd、Sr同位素组成，且变化范围大，是岩浆源区同化混染作用的结果。

The diabases have riched type Nd , Sr isotopic composition and have great varying range , which is the result of action together both magma source and contamination .

来自地幔的火山喷发的岩浆未遭受地壳物质的混染作用。

Mantle magma is free from crust contamination .

火山岩的元素地球化学特征反映岩浆来自富集地幔，在源区存在陆壳的混染作用。

The element-geochemical features reflect that the magma comes from enriched mantle and that hybridism of continental crust occurs in the source area .

岩浆演化过程中主要发生结晶分异作用，外来物质的混染作用较弱，混染物来自上地壳和俯冲板块。

The fractional crystallization is the main geological process in magmatic evolution , and contamination is weak . Two exotic components come from upper crust and / or subduction plate .

锶、铅、氧同位素的初步研究结果对岩浆的幔源性质及所经受的同化混染作用提供了一些线索。

The preliminary results of strontium . lead and oxygen isotope studies has provided some clues to the mantle origin of the magma and to the assimilation and hybridization it undergoes .

主要岩石类型有橄榄玄武岩、碱性橄榄玄武岩、碧玄岩、霞石岩以及由分异作用或混染作用形成的碱性辉绿岩、拉斑辉绿岩和方沸正长岩；

These rocks consist of olivine basalt , alkali olivine basalt , basanite and nephelinite , together with alkali diabase , tholeiitic diabase and analcite syenite which have been formed as a result of differentiation and contamination .

俯冲陆壳和洋壳析出的流体对交代富集地幔源区均有贡献，岩浆演化过程中地壳混染作用微弱，部分熔融和结晶分异对成岩过程均有影响。

The fluids derived from dehydration of subducted slab , both continental crust and oceanic crust contributed to enrichment of metasomatic mantle . The lamprophyres was subtly contaminated by crustal substances . Both partial melting and crystallization fractionation play an important role in rock-forming processes .

成岩作用是分离结晶和同化混染联合作用。

The main diagenesis is fractional crystallization assimilation and contamination .

解决岩浆岩石学中的一些疑难问题，如岩浆不混溶作用、岩浆混合作用、岩浆混染作用、岩浆中硫的性状、地幔部分熔融和地幔交代作用等方面的问题。

And ( 4 ) to explore and resolve various doubts and difficulties of magmatic petrology , such as : magma immiscibility , magma mixing , magma contamination , behaviour of sulphur species in magma , mantle partial melting , and mantle metasomatism .