酸性火山岩

从基性火山岩到酸性火山岩，随着SiO2的增加，轻重稀土分馏程度越来越高。

With the increase of SiO2 , from the basic volcanic rock to the acid volcanic rock , the fractional degree of HREE and LREE becomes more and more high .

酸性火山岩岩浆则具有壳源性质。

The magma of acid volcanic rock mainly has the characteristics of crust source .

新西兰陶波酸性火山岩Sr－O同位素体系

Sr-O Isotopic System of Taupo Acidic Volcanic Rock in New Zealand

陆内裂谷、裂陷区富碱高钠中基中酸性火山岩有关的AuCuFe成矿亚系列；

Au-Cu-Fe subseries related to high-Na and alkaline-rich intermediate-basic or intermediate-acid volcanic rocks of intracontinental rift (ⅲ);

这些特征表明，Jade热液活动区的热液硫化物矿床的成矿物质来源于下伏的酸性火山岩。

All these characteristics indicate that the acidic lava is maybe the main source of hydrothermal sulfide deposits in the Jade area .

利用岩石薄片X衍射技术，在松辽盆地深层富碱酸性火山岩中识别出特征的碱性暗色矿物&钠铁闪石，从而确定其为碱流岩。

Using thin section X-ray diffraction techniques , his paper identified arfvedsonite in volcanic rocks from Songliao Basin , and thus confirmed that the volcanic rocks are composed of pantellerite .

甘肃白银矿田变酸性火山岩锆石LA-ICP-MS测年&白银式块状硫化物矿床形成时代新证据

A LA-ICP-MS U-Pb chronological study of zircons from meta-acidic volcanics in Baiyin orefield , Gansu Province : New evidence for metallogenic age of Baiyin type massive sulfide deposits

在酸性火山岩中获得1700±12Ma（锆石U-Pb）同位素测年值和547±14Ma变质年龄值。

4 ) isotopic dating ( Zr and U-Pb ), from the acidity volcanics , attained 1,700 + 12Ma and the metamorphic age 547 + 14Ma .

伸展盆地的晚期阶段，在中酸性火山岩系与上覆碳酸盐岩接触带中产出赵卡隆式VHMS矿床，具有Ag-Fe-Pb-Zn金属组合特征，形成于浅水环境；

In the late stage of the extension basin , the " Zhaokalong-type " VHMS deposits showing the association feature of elements ( Ag-Fe-Pb-Zn ) formed in the contract strip between the intermediate-acidic volcanic rocks and the overlying carbonate rocks and developed in the shallow-water facies .

作者通过对武当群的所有年龄测定数据重新作了综合分析之后认为：1.变酸性火山岩的下限年龄大于1900Ma；

The authors analyzed and interpreted again all the age data in the Group using some new dating methods . The integrated analysis indicates the ' following : ( 1 ) the lower limit of the ages of the meta-acid volcanic rocks should be older than 1900 Ma ;

江洲S型中酸性火山岩的特征及成因

Features , genesis of Jiangzhou S-type intermediate - acid volcanic rocks

我国酸性火山岩中的柱状节理构造景观

The Columnar Joint Landscape of Mesozoic Acidic Volcanic Rocks in China

火山岩储集层有基性火山岩也有酸性火山岩。

Volcanic rock reservoir involves basic and acidic volcanic rocks .

主要岩石类型为爆发相、钙碱性系列的中酸性火山岩。

Dominant rock type is volcanic eruption facis and calc-alkaline medium-acid volcanic rocks .

成矿母岩为中&酸性火山岩；

Its mother rocks are intermediate - acid volcanics .

酸性火山岩为地壳重熔作用的产物。

The acid volcanic rocks are the product of the anatexis of the crust .

辽西中生代陆相中&酸性火山岩建造与金银矿化的关系

Relationship between Neutral-acidic Volcanic Rock Geogeneration and Au , Ag Mineralization in the West of Liaoning

凭祥地区金矿床受断层构造与酸性火山岩的双重控制。

Gold deposits in the Pingxiang area are controlled by faults and hosted in acid volcanics .

松辽盆地北部深层的酸性火山岩中广泛发育缝合线构造。

Stylolite structure is widely distributed in deep burial acidic volcanic rocks in the northern Songliao Basin .

石炭纪酸性火山岩的稀土和微量元素地球化学特征与陆内流纹岩相似。

The silicic volcanic rocks of Carboniferous times has similar REE and trace elemental geochemistry as continental rhyolite .

认为该区酸性火山岩主要由流纹岩和英安岩组成，属低钾系列和钙碱性系列。

The rocks are mainly composed of rhyolite and dacite , belonging to low-K and calc - alkaline series .

酸性火山岩中铀的原始性状、活化迂移及作为铀源的可能性

Original behavior , mobilization , migration of uranium in acidic volcanic rock and its possibility as a uranium source

中国东南沿海中生代酸性火山岩的锶和钕同位素特征与岩浆成因

Sr and Nd isotopic characteristics and magma genesis of Mesozoic volcanic rocks along the coastal region of southeastern China

在火山建造中以基性火山岩为主，酸性火山岩较少。

The volcanic formation is dominated by basic volcanics ( basalt ) with less acidic volcanics ( rhyolites ) .

蛇绿混杂岩中的北部中-酸性火山岩和南部蛇绿岩分别代表了弧后盆地扩张开裂早期和晚期阶段的产物。

Volcanic-sedimentary assemblage of the northern melange was formed in the early stage of the expanding of the back-arc basin .

北部火山-沉积岩系以中-酸性火山岩为主，夹含少量的玄武岩和沉积碎屑岩。

While , the volcanic-sedimentary assemblage includes of basaltic andesites , intermediate-acidic volcanic and clastic rocks , with a miner of basalts .

物源区母岩类型主要为花岗岩，中酸性火山岩及低级变质岩。盆地不同位置物源区的大地构造背景和母岩类型有所不同。

The types of parent rocks in the source area include granite , intermediate to acidic volcanic rocks and low-grade metamorphic rocks .

这些基性火山岩型和酸性火山岩型矿床被统称为昆仑式火山岩型块状硫化物铜矿床。

All the mafic and felsic volcanic-hosted massive sulfide deposits are therefore defined as the Kunlun type volcanic-hosted massive copper sulfide deposit .

大兴安岭火山喷发带北段中性、中酸性火山岩地球化学特征及其地质意义

Geochemical characteristics and geological significance of intermediate and intermediate-acid volcanic rocks in the northern sector of the Da Hinggan volcanic eruption zone

而地开石粘土是在250～100℃的中低温阶段酸性火山岩的热液蚀变产物。

Dickite clay was the product from hydrothermal altera - tion of acidic volcanic-rocks at meso-low temperature stage of 250 ~ 100 ℃ .