火山岩

The results of experiments has proved that paragenetic associations of the minerals of metasomatic rocks formed at 380-7000℃ temperatures and (250-800)× O.1MPa pressures are similar to those in the aforementioned three iron ore deposits, are TFe= 11.89-3881.89mg/1 is extracted from sdbvolcanic-volcanic rocks.

实验结果证明了在380—700℃和(250—800)×105Pa的温度和压力下形成了与上述三个矿床相似的交代岩的矿物共生组合，并且从次火山岩-火山岩中萃取出TFe(11.89—3881.89mg/1)。

The metal elements of the volcanic-hosted massive sulfide deposit have two sources, the copper and zinc are derived from rhyolitic magmas whereas the lead are probably related to old sediments overlying the rhyolites.(4) It is suggested here that the volcanic rocks hosting massive sulfide deposit in the north Qilian orogen, which are previously considered as a bimodal suite of Neo-proterozoic to middle Cambrian age in a continental rift, are virtually related to subduction magmatism in Ordovician age, and there might have no continental rift magmatism of Neo-proterozoic to middle Cambrian in the north Qilian.

Th/Ta比高(5.0～11.7)，εNd为较大的负值(-2.6～-8.4)，流纹岩的形成可能是两个端元组分混合的过程、或是上地壳混染的结果，形成在活动陆缘环境；(3)北祁连块状硫化物矿床成矿金属物质具有两种来源，Cu、Zn等来源于流纹岩，而Pb的来源可能与古老沉积物有关；(4)本文认为，前人厘定的北祁连新元古代-中寒武纪赋存块状硫化物矿床的大陆裂谷双峰式火山岩应是与俯冲作用有关的奥陶纪火山岩，说明北祁连可能不存在新元古代-中寒武纪的大陆裂谷活动。

The volcanic rocks of the Jiangzierkuduke Fm. belong to shoshonite series, and is also characterized by relative high LILE enrichment, suggesting the late stage of island arc. Those of the Batamayineishan Fm. belong to alkaline series, characterized by strong enrichment of LILE, implying that they formed in intracontinental plate.

江孜尔库都克组火山岩为钾玄岩系列，并且具有较高的LILE富集，表明其形成于岛弧演化的晚期阶段；巴塔玛依内山组火山岩为碱性系列，并且具有强烈富集LILE的特征，指示了其形成于大陆板内环境。

Studies of petrology and petrochemistry indicate that such suit of volcanic rocks dominated by lattite belongs to shoshonite series to potassic alkali basalt series. Considering the stability of rocks and their associations, gentle stratum occurrence, fresh degree of rocks and comparatively clarity of horizons. this potassic volcanic stratum distributed over the Sailipu area is named as Sailipu Formation, and the age of which is early middle Pleistocene of Quaternary.

岩石学、岩石化学研究表明，这套火山岩是以安粗质熔岩为主的钾玄岩系列－钾质碱性玄武岩系列火山岩，岩石类型及岩石组合稳定，岩层产状平缓，岩石新鲜，层位相对清楚，故将其命名为赛利普组，属第四纪早－中更新世。

The distinctive features of volcanic rocks, especially the spilite, illustrates that mantle plume or hotspot with small scale might be the essential origin of a series geologic events such as the extension of crust, the interval eruption of submarine bimodal volcanic rocks especially the increasing eruption of basic rocks, and the mineratlization of Ashele mine

认为成岩、成矿背景属裂陷拉张环境，火山岩尤其是细碧岩具有五大特殊性，初步提出了热点作用是导致地壳拉张、双峰式火山岩间互喷发、从早到晚基性火山作用趋于增强、以及成矿作用等一系列地质事件的深层次原因的看法

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。

Igneous stratum can be divided into three belts, from east to west it lays igneous rock belt, transition rock belt and sedimentary rock belt, from lower to upper it lays tuff belt, trachyte belt and basalt belt.

研究发现火山岩系在横向和纵向上都可划分为三个带，横向由东到西为火山岩带、过渡带、正常沉积岩带，纵向自下至上分为凝灰岩带、粗面岩带、玄武岩带。

Moreover,the relationship between volcanic rock and three pool-forming factors, including oilsource rock, reservoir strata and cap rock, determined the different types of volcanicrock typal reservoir (a kind of oil and gas reservoir relates to volcanic rock), finally,conclusion points out the beneficial combination of generation, accumulation andsealing.

并从火山活动在油气形成中的作用入手，分别讨论火山岩与生油岩、储集层和盖层的关系，总结出火山岩类油气藏类型，指出有利生储盖组合。

Judging by the function of volcanic rockacting in the process of generation, accumulation and sealing, the study obtains sevenkinds of trap patterns for volcanic rock typal reservoir of oil and gas, one kind ofcombination types is self-generation and self-accumulation, the other isunder-generation and up-accumulation, totally, there are nine kinds of beneficialcombination of generation, accumulation and sealing.

结合该地区生储盖条件与火山岩的配置关系得出三大类共七种火山岩类油气圈闭类型，组合类型有自生自储型和下生上储型，共九种有利生储盖组合类型。

But the volcanite is complex and variable, this makes the lithologic identification very difficult and brings very large risk in exploration and development of volcanite reservoir.

但是由于火山岩复杂多变，岩相识别难度大，往往给火山岩油气藏勘探和开发带来极大风险。

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。