island arc tholeiite

Based on geology and geochemical researches of the metabasic volcanic rocks,two types of basalts are recognized in the tectonic belt of the northern margin of the Yunkai block,southeastern Guangxi,namely,mid-oceanic ridge basalt(MORB) and island arc basalt(IAT).

06%),轻稀土元素呈富集型,具岛弧型玄武岩特征。

Erupted basalts in this area have 98～105 Ma KAr isotopic age, and their geochemical characteristics show that these basalts are divided into two types: tholeiite and alkaline olivine basalt.

岩石地球化学特征表明研究区有两类玄武岩:江山陈塘坞一带的拉斑玄武岩,礼贤、广丰一带的碱性橄榄玄武岩。

Therefore, the element ratios can be applied to the study of trace element characteristics of rocks in the tholeiite source region.

因此研究拉斑玄武岩源区岩石中的微量元素特征可以采用元素比值的方法。

Studies of immobile elements in the rocks show that these meta-volcanic rocks were tholeiite originally, and have geochemical characteristics of mid-ocean ridge environment,belonging to T-type MORB.

不活动组分的研究显示，其原岩主要是拉斑玄武岩类，且具有形成于洋中脊环境的地球化学特征，可能属于T型地幔源区的洋中脊玄武岩（MORB）。

The protolith of eclogites in north Qinling belongs to tholeiitic basalt.

地球化学研究表明:北秦岭榴辉岩原岩属于拉斑玄武岩系列,岩石的Nb/La=0。

Analysis shows that the geochemical characteristics of volcanic rocks and diabase-porphyrite of the Late Jurassic-early Early Cretaceous subalkaline (calc-alkaline) tholeiites series are similar to those of continental-margin rift-type tholeiites, suggesting that the Neo-Tethys Ocean was in a spread.

分析结果显示,晚侏罗世—早白垩世早期亚(钙)碱性拉斑玄武岩系列火山岩和辉绿玢岩的岩石地球化学特征与大陆边缘裂谷型拉斑玄武岩相似,表明新特提斯洋在晚侏罗世晚期—早白垩世早期处于扩张阶段。

Nb-enriched basalt is a kind of arc basalt that has special geochemical characteristics.

富铌玄武岩是一类具有特殊地球化学特征的岛弧玄武岩。

Do the Tianshan Carboniferous volcanic successions contain Nb-enriched arc basalts?

天山石炭纪火山岩系中含有富Nb岛弧玄武岩吗?

tholeiitic dolerite

拉斑玄武岩质粒玄岩

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

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。

basalt eclogite transformation

玄武岩 榴辉岩转化

alkali olivine basalt magma

碱性橄榄玄武岩岩浆

tholeiitic gabbro

拉斑玄武岩质辉长岩

Penghu Islands, mainly composed of basalts, enjoy well-developed columnar joints that create many dramatic geological and landscape types of scenery.

澎湖群岛主要由玄武岩构成，岛上有各式各样独特的地质、地貌景观。

Basic suite consists of tholeiite and alkali-basalt.

基性岩套由拉斑玄武岩-碱性玄武岩组成.

of or relating to or containing basalt.

属于、关于或含有玄武岩。

Ullswater basalt group

尤尔斯瓦特玄武岩群

Basalt, basalt everywhere, and not a drop of water in sight.

玄武岩，到处都是玄武岩，视野中没有一滴水。

It belong series of the alkaline basalt, and have character of island ocean in geochemistry and petrochemistry.

岩石化学、球化学特征表明,该组火山岩属碱性玄武岩系列大西洋型(质类型)具洋岛特征.

The Archaean meta-basalts are distinguished into two meta-basalts formed in the greenstone belt and in the high-grade metamorphic region.

本文把太古代变质玄武岩分成绿岩带变质玄武岩和高级区变质玄武岩。

The compositions of major elements from the rocks are consistent with those of basalt and have evolutional current of tholeiite.

岩石的主量元素组成和玄武岩一致,并且具有拉斑玄武岩演化趋势。

Basalt is the commonest volcanic rock.

玄武岩是最普通的火山岩。

Petrogenesis of High-Ti and Low-Ti Basalts in Emeishan;

峨眉山高钛和低钛玄武岩的岩石成因

Enrichment Mechanism of PGE in Emeishan Basalts and Comparison of PGE Mineralization between Continental and Oceanic Basalts;

峨眉山玄武岩PGE富集机理——兼论陆海玄武岩PGE成矿作用差异