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玄武岩

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The PGE distributive patterns are the PtPd type, the Pt/Pd ratios of 0.32-0.68 are between the values of enriched sulfide tholeiite (0.38) and primitive upper mantle (1.36), and the similarity of partition patterns of chondritenormalized REE, MORB-normalized trace element and primitive mantle normalized PGE for the rocks of the three phase zones, indicate the Baimazhai intrusive body I formed by the evolution, liquation, intrusion and diagenesismetallogenesis of basaltic magma.

铂族元素配分模式为Pt-Pd型,w/w比值为0.32~0.68,介于富硫化物拉斑玄武岩(0.38)和原始上地幔(1.36)之间,以及稀土元素配分模式、微量元素蛛网图和铂族元素配分模式中不同岩石配分曲线的相似性揭示3个相带不同岩石之间的高度一致性,展示基性-超基性岩形成于玄武质岩浆演化、熔离及岩浆一次性侵入、分异成岩成矿的特征。

Basalt core was unchanged, and feldspar and pyroxene partly steatited in its rind.

玄武岩的核心区矿物基本无变化,外环的长石及辉石发生了皂石化,部分基质绿泥石化。

It is suggested that the pyroxenite xenoliths were formed by the crystallization differentiation of the differentiated mantle-derived magma.

伊通新生代玄武岩中存在3种不同成因的捕虏体,其中上地幔岩浆分异结晶形成的辉石岩捕虏体中尖晶石具有独特的成分分带。

A lot of enclaves named spinel lherzolite and pyroxenite derived from the mantle were fount in alkali basalt of Miocene Naitoushan period.

其中奶头山期碱性玄武岩中含有幔源的尖晶石二辉橄榄岩包体和辉石岩包体。

The dyke swarms can be divided into pyroxenite, diabase, gabbro-diabase. They, together with the snychronogenic trachyte and basalt distributed in the area, constitute a suite of bimodal volcanic rock association, indicating that an extension event of the crust occurred in this area during the end of Early- Paleozoic.

该岩墙群主要岩石包括有辉石岩、辉绿岩以及辉长辉绿岩,它们与该区同时代粗面岩和玄武岩类一同构成本区一套具双峰式火山岩特征的岩石组合,指示了该区在早古生代末期曾发生一次地壳伸展扩张事件。

A lotof enclaves named spinet lheriolite and pyroxenite derived from the mantle were fount In alkali basah.of Miocene Naitoushan period.

其中奶头山期碱性玄武岩中含有幔源的尖晶石二辉橄榄岩包体和辉石岩包体。

Oceanic lithospheric mantle harzburgite occurs together with meta-cumulate complex (including garnet pyroxenite and kyanite-eclogite) and MORB-related eclogite; these represent blocks of oceanic lithosphere.

2大洋蛇绿岩型地幔橄榄岩,与变质的堆晶杂岩(包括石榴辉石岩、蓝晶石榴辉岩)和具有大洋玄武岩特征的榴辉岩构成典型的蛇绿岩剖面,代表大洋岩石圈残片。

Oceanic lithospheric mantle harzburgite occurs together with meta-cumulate complex (including garnet pyroxenite and kyanite-eclogite) and MORE-related eclogite; these represent blocks of oceanic lithosphere.

2大洋蛇绿岩型地幔橄榄岩,与变质的堆晶杂岩(包括石榴辉石岩、蓝晶石榴辉岩)和具有大洋玄武岩特征的榴辉岩构成典型的蛇绿岩剖面,代表大洋岩石圈残片。

The Wandashan massif, in which occurred HIMU-type OIBs with highly radiogenic Pb isotope compositions from the Raohe area, is a foreign terrane accreted to the CAOB.

其中在完达山地体的饶河地区出露了一套异常高Pb同位素比值的HIMU型洋岛玄武岩,代表了中生代的新增生外来地体。

The ophiolites can be divided into two groups at least; one lies in the Kuhai complex and intersected by Caledonian island granite, which may be attributed to Caledonian or pre-Caledonian ophiolite association; the other lies in the Early Permian — Early Triassic Ma'erzheng Fm. of Buqingshan Gr., including ultramafic rock, basalt, diabase dike and pelagic siliceous-argillaceous association, and Early Permian radiolarian are found in the silicates, which reflect that the time is Hercynian.

其中蛇绿岩组合至少可分出两套,其一就位于变质的苦海杂岩中,被加里东期岛弧型花岗岩侵入切割,可能属加里东期或前加里东期的蛇绿岩组合;其二就位于早二叠世—早三叠世布青山群马尔争组中,包括超镁铁质岩、玄武岩、辉绿岩墙及远洋硅泥质岩组合,其中硅质岩中发现有早二叠世放射虫,说明其形成于海西期。

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