查询词典 volcanic rock

Research finds out that Carboniferous-Early Permian volcanic rocks system that largely distributing in Tianshan and its adjacent regions are continental rift volcanic rock system, it originated from mantle plume, they may be the surface response of the deep Geodynamics of paleo-Tethys extension effect in central Asian region.

5研究查明天山及其相邻地区广泛分布的石炭纪—早二叠世火山岩系为大陆裂谷火山岩系，其源区起源于地幔柱，它们可能是古特提斯拉伸裂解作用的深部地球动力学在中亚地区的地表响应

In this paper, the petrology, mineralogy and geochemistry of basic-ultrabasic volcanic rock, granite and skarn related to the Sn-Cu skarn-type ore and the vein-type ore in Laochang ore field have been researched systematically, some conclusions are summarized as follows:In Gejiu tin-polymetallic district, the middle Triassic volcanic rocks belonging to calc-alkaline basalt-tholeiite serie, mainly consist of pyroxene, hornblende, feldspar, chlorite and phlogopite; All the granites are peraluminous granites related to the Yanshanian collision-orogeny. Laoka granite closely related to the tin-polymetallic deposits emplaced in the post- orogenic.The metal elements show obviously vertical zones with the variety of skarn types in dimensional extension; The occurrence of garnet skarn and diopside skarn alternately developed in the horizontal zones of the contact between granite and carbonatite are mainly related to two factors: one factor is the infiltration metasomatism of post-magmatic hydrothermal solution, the another is the metrical strata of marble and calcic-dolomite developed in country rocks.

本文重点以老厂矿田中的接触带锡铜矿床和脉状矿床为研究对象，采用化学分析、ICP-MS、X射线粉晶衍射分析、电子探针等测试手段，对本区与成矿相关的基性-超基性火山岩、花岗岩、夕卡岩、电气石-石榴石等进行了系统的地质地球化学研究，研究表明：个旧矿区中三叠纪个旧组地层中的火山岩为钙碱性玄武岩-拉斑玄武岩系列，岩石为辉石-角闪石-长石-绿泥石-金云母组合；本区的花岗岩为过铝质花岗岩，主要与燕山期碰撞造山作用有关，锡多金属成矿与形成时代最晚、分异较好的花岗岩关系密切；本区夕卡岩中的有用共生组份随着夕卡岩类型及其矿物组合的不同具有明显的分带性。

The rhyolite of upper Luliang Group is a typical A-type volcanic rock and is a constituent member of an A-type volcanic - intruded complex in this area.

研究表明吕梁群流纹岩是一个典型的早元古代A型流纹岩，是本区A型火山一侵入杂岩的组成部分。

A volcanic rock formed by the welding together of tuff material from an explosive volcanic eruption .

火山喷发的活火山喷发的，与活火山喷发有关的，由活火山喷发而组成的

Iron deposit is concerned with spilite keratophyre, rich in Fe, Na〓O, Alternative types are similar-skarnization, Iron deposit is of aeromagnetic anomaly. Indexes of Cu, Pb-Zn deposits are contemporaneous fault, ore-bearing bed, volcanic rock with high potassium, volcanic structure, a serious of alternative in ore-bearing bed and under ore-bearing bed, high content of Pb, Zn, Ag, Cu, Cd, Ba, As, CaO, Fe, Mn, low Na〓O, Al〓O〓 in mineralizing body.

铅锌矿形成大矿富矿指标：①NW、NE向同生断裂；②有利含矿层位D〓k〓〓；③酸性富钾火山岩；④火山机构发育；⑤有利于矿质聚集的火山洼地；⑥发育与流体活动有关的矿下层、矿层、蚀变岩筒蚀变；⑦块状、浸染状铅锌黄铁磁黄铁矿石；⑧原生晕中Pb、Zn、Ag、Cd、Ba、Cu、As元素组合，CaO、TFe、Mn富集，Na〓O、Al〓O〓亏损，其下部位富K〓O或Na〓O。

On the basis of an integrated analysis of the geochemical features of these volcanic rock associations,this paper concludes that thebasalts originated mainly from interaction between mantle-derived magma and low-crustal materials, and rhyolitic volcanic rocks resulted from thermal and chemical interaction between basaltic magma and the upper part of crustal materials.Basalts and rhyolites in different cycles have different source regions,and they are products of multiperiodic pulsive layer partial melting.

根据对火山岩地球化学特征的综合分析表明，玄武岩主要为幔源岩浆与下部地壳岩石相互作用的产物，而流纹岩则为玄武岩浆与上部地壳物质进行热及成分交换的结果，不同旋回的玄武岩和流纹岩有不同的源区，为多次脉动分层部分熔融的产物。

With high silica（SiO2 = 75.49 % on average）, rich potassium（K2O = 3.88 % on average）, low titanium （TiO2= 0.136% on average）and A/CNK high than 1.1（1.53 on average）, the acidic volcanic rocks of Manghuai Formation belong to potassium-rich calc-alkali rhyolitic volcanic rock series.

官房地区火山岩属三江构造带南澜沧江构造岩浆带北段，中晚三叠世喷发了一套由中三叠统忙怀组酸性火山岩和上三叠统小定西组基性火山岩组成的火山岩系。

The original alkalic series of basalic magma evolutes into trachybasalt through crystallization differentiation of olivine and pyroxene, and the trachybasalt is transformed into alkalic rhyolite with remarkable Eu, Sr, Ba, Ti, P nagetive abnormalities through strong crystallization differentiation of plagioclase and also pyroxene Ti Fe oxides and apatite, all together leading to the loss of neutral (SiO 2=57%～63%) andesite and trachyandesite in the volcanic rocks in this area and appearance of bimodal volcanic rock combination feature.

原始碱性系列玄武质岩浆经橄榄石、辉石的结晶分异，向粗面玄武岩演化；粗面玄武岩经斜长石强烈的结晶分离作用，还有辉石、钛铁氧化物和磷灰石的分离结晶作用形成具显著Eu、Sr、Ba、Ti、P负异常的碱性流纹岩，导致本区火山岩缺失中性(SiO2=57%～63%)的安山岩和粗安岩，呈现双峰式火山岩组合的特点。

Over one hundred sixty volcanic cones,pyroclastic sheet,river valley lava and eight maars with phreatomagmatic eruption genesis distribute of Longgang volcano,Jilin Province.The volcanic rock of Longgang volcano is trachybasalt with very similar chemical composition(SiO2=48-50%).

龙岗火山区分布160多个玄武质火山渣锥，以及火山碎屑席、河谷熔岩和8个射气岩浆喷发的低平火山口－龙湾，所有火山岩为单一钾质粗面玄武岩(SiO2变化于48-50%)。

The trachytic volcanic rock, with its intact volcanic mechanisms, formed the splendid peaks, valleys and waterfalls after the erosions and weathering of long time.

经后期的构造切割和各种侵蚀风化作用，西樵山火山形成了诸多俊秀的山峰，幽深的峡谷、瀑布。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。