富集地幔

低REE组和高REE组煌斑岩分别是交代富集地幔约10%和4%部分熔融的产物。

Low REE group and high REE group lamprophyres are 10 % and 4 % partial melting of the metasomatic enriched mantle .

始新世太平洋板块以俯冲作用为主，诱发了区域近南北向伸展构造事件，并形成具有EMⅠ富集地幔混染特征的玄武岩；

The subduction of Pacific Plate during Eocene induced the S-N extension event and basalts with EM ⅰ and EM ⅱ enriched mantle contamination were formed .

大别地区富K岩系的源区与富集地幔密切相关，下扬子地区的则与下地壳有更多亲缘关系。

The source area of K-rich magmatic rocks in the Dabie area is closely related to the enriched mantle , while the rocks in the lower Yangtze Valley area are more affined to the lower crust .

变超基性岩蛇纹石化橄榄岩的稀土元素配分具典型的U形特征，显示为具地幔交代作用的LREE富集地幔残余。

The REE distribution of serpentinized peridotite in ultrabasic rocks is the characteristic of U-type , showing that it was the LREE enriched residual mantle experienced in mantle metasomatism .

形成这种岩石地球化学特征的可能机制为：碳酸岩浆直接来源于岩石圈富集地幔的低程度部分熔融作用（F＜1%），残留地幔矿物组合以富含柘榴石为特征；

The carbonatite may be produced by mechanisms as follows : the carbonatite magma is directly formed by very low degree ( F < 1 % ) partial melting of enriched lithospheric mantle , leaving residual minerals characterized by abundant garnet ;

以高钛、富铝，富碱、低Nb为特征，同样显示富集地幔的特征，但富集程度减弱。

They are featured by high Ti , Al , alkali and low Nb with some rich in Pb . These geochemical features also indicate an enriched mantle signatures but the enrichment degree is weaker .

放射性同位素~（87）Sr/~（86）Sr初始值平均为0.7048，εNd值为-5.3，暗示岩浆起源于富集地幔，并受到榴辉岩相镁铁质岩石低熔组分混染。

Radioactive isotope ~ ( 87 ) Sr / ~ ( 86 ) Sr initialized average value is 0.7048 , and ε Nd value is - 5.3 , which show magma come of enriched mantle , and assimilated by the lower melt compositions from the eclogite face mafic rocks .

富集地幔源区（EM1）的产生是俯冲并熔融的扬子下地壳物质进入华北岩石圈地幔并与之相互交代作用形成的。

The formation of the enriched mantle ( EM1 ) is attributed to the strong metasomatism-taking place between subducted Yangtze lower crust and NC ( north of China ) ancient lithosphere .

稀土和微素元素地球化学研究显示流体源自富集地幔；

REE and trace elements indicate that fluid came from enriched mantle .

长江中下游晚中生代中基性岩的铅同位素特征：富集地幔的证据

Pb Isotopic Characteristics of Late Mesozoic Mafic Rocks from the Lower Yangtze Region : Evidence for Enriched Mantle

该蛇绿岩有高的稀土和微量元素丰度，表明其来源于富集地幔。

This ophiolite has higher REE and trace element abundances , suggesting it was derived from the enriched mantle .

通过火山岩地球化学特征研究表明，繁昌盆地内4组火山岩具有岩浆同源性关系，其岩浆源区为富集地幔。

The four formations of volcanic rocks of Fanchang Basin had homologous magma , which is from the enrichment mantle .

其源区可能为与俯冲流体有关的富集地幔，有待于进一步研究。

The source of the studied mafic dikes may be the enrichment mantle that was modified by subduction metasomatic fluids .

它们是来自富集地幔的同源碱性岩浆，在不同空间冷凝结晶形成。

The two kinds of rocks were formed as a result of comagmatic crystallization from enrichment mantle in different space .

微量元素和同位素特征显示，玄武岩起源于与洋岛玄武岩源区相似的富集地幔源。

According to the characteristics of trace elements and isotope , the source of the basalt is similar to the OIB source .

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 .

碱性超基性脉岩岩性上为单一的橄榄辉石岩，为富集地幔源低度（3.4%）部分熔融作用的产物，岩浆演化过程经历了以橄榄石为主的分馏作用。

The alkalic-ultramafic dikes formed by low degree partial melting ( 3.4 % ) of enriched mantle , consist of single olivine pyroxenolite , the dominating olivine fractionation is evident .

而碳酸岩的碳氧及斑晶磷灰石的锶、钛同位素组成与典型地幔物质有差异，与富集地幔颇为近似，从而证实在山东地区陆壳下存在富集地幔源区。

Some differences are found in O and C isotopic composition between phenocryst apatite and typical mantle materials , but the apatite is similar to that from the enriched mantle .

富碱岩浆起源于地幔交代作用形成的富集地幔源区，而富硅成矿流体则具有原始地幔流体性质，前者的硅同位素组成表现为经历强烈动力分馏的高正值；

The alkali-rich magma derived from a source in enriched mantle to be formed by mantle metasomatism is characterized by high positive number of silicon isotope composition experienced intense dynamic fractionation .

形成于活动大陆边缘和造山带与金矿有关的钙碱性煌斑岩来源于由板块，地体和板片俯冲作用引起的富集地幔；

Calc alkaline lamprophyres , formed in the active continental margin and orogenic belt , related to gold deposits are come from enriched mantle caused by subduction of Plate , terrane or slab .

而白榴石碧玄岩-响岩系列和钾玄岩系列来自与古俯冲有关的古老富集地幔，为岩浆分离结晶作用的产物。

However , the leucite basanite - phonolite series and shoshonite series were evolved from an old enriched mantle related to ancient subduction , and their geneses are attributed to the fractional crystallization in different degrees .

以上事实说明华北地台区富碱侵入岩的物质来源与富集地幔关系密切，而地槽区的则与亏损地幔关系密切。

All those facts above show that source material of the alkaline-rich intrusions in North China platform has close relationship with the enriched mantle and that of the geosynclinal area has close relationship with the depleted-mantle .

元素地球化学特征显示：细晶闪长岩石英闪长岩的岩浆源于富集地幔或洋壳俯冲脱水交代的下地壳，地壳增厚过程产生并就位；

The characteristics of elements shows that magma of fine diorite-quartz diorites derived from the enriched mantle or lower crust undergone ocean crust subducting and dehydrating , and was formed and emplaced in the process of crust growth .

在俯冲板块进入地幔后，含金流体和分熔产物一起上升并交代地幔楔，形成能够产生富金煌斑岩浆的富集地幔。

When the down_going plate enters the mantle , gold_bearing fluids accompanied by partial_melting products will rise and react on the mantle wedge , resulting in an enriched mantle that is fertile for the generation of gold_rich lamprophyre magma .

其中二长闪长岩和霓辉正长岩，岩浆起源于富集地幔，并有地壳物质的参与；二长岩类岩浆为壳-幔混源，花岗岩类及脉岩类岩浆来源于地壳。

Among the complex , monzodiorite and syenite originated from enriched mantle , and has the participation of crustal material ; monzonite magma originated from crust - mantle mixed source , and the granite magma derived from crustal source . 4 .

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 .

痕量元素、REE及Sr同位素的特征表明岩浆起源于富集型地幔源区。

Data on trace elements , REE and isotope Sr indicate that the magma come from enriched mantle .

低的Ni、较高的H2O，说明初始岩浆起源于富含H2O的富集型地幔源区，在相对较低的温度下熔融形成。

Low value of Ni and high content of H 2O suggest that original magma be formed by partial melting of low-temperature part in mantle enriched water .

元素的地球化学模拟表明，碱性OIB和E-MORB样品是来自较原始地幔还要富集的地幔源区。

Element geochemical modelling indicates that both alkaline OIB and E-MORB samples were generated from the enriched mantle source .

Ba/Nb、La/Nb、Ba/La、Ba/Th和Rb/Nb比值证明，这些火山岩全部源自于富集型地幔源区，而且主要是EMI型地幔。

The Ba / Nb , La / Nb , Ba / La , Ba / Th and Rb / Nb ratios demonstrate that these volcanic rocks were exclusively derived from the enriched mantle , mainly the EMI type mantle .