火山岩

Situated on the margin of the Lishui volcanic basin, Jiangsu, the Aijingshan strontium deposit is controlled by the F 2 fault and the crystal tuff and andesitic porphyrite of the Longwangshan group.

江苏溧水爱景山特大型锶矿床位于溧水火山岩盆地的边缘，受F2断层、龙王山组晶屑凝灰岩、安山玢岩控制。

They have A/CNK values of 0.9～1.2, suggesting aluminum saturation or ersaturation, and are enriched in LREE and LILEs and depleted in HFSEs. Their δEu values are 0.11～0.32, evidently indicating plagioclase fractional crystallization.(87Sr/86Sr)i ratios and εNdvalues are 0.707?9～0.716?1 and -6.90～-7.70 for volcanic rocks, and 0.7086～0.7098 and -7.10～-7.68 for quartz syenitic porphyrite, respectively, implying that all the igneous rocks from the Yandang Mountain were evolutional products of co-magmas, and derived mainly from the crust, mixed however with mantle components.

岩石富集轻稀土元素和大离子亲石元素，相对亏损高场强元素；δEu值为0.11～0.32，表明岩浆经历了以斜长石为主的强烈结晶分异作用；火山岩(87Sr/86Sr)i为0.707 9～0.716 1，εNd为-6.90～-7.70，中央侵入体石英正长斑岩(87Sr/86Sr)i为0.708 6～0.709 8，εNd为-7.10～-7.68，表明它们是同源岩浆不同阶段分异演化的产物，物质来源主要为陆壳，但也有地幔物质参与。

We mainly supply stone materials such as Hexagon Stone,Slabstone,Pumice,Stone Carving,Sandstone,Marble,Tuff, Granite,Stone for river banks,Volcanic rock,Talc etc,and Sleepers,casting products made of steel and iron.

经营各种六方石、铁平石、浮石、石雕、砂岩、大理石、玉砂利、凝灰岩、花岗岩、间知石、火山岩、滑石等石材制品以及枕木和钢铁铸件产品，并相信其中有些产品贵公司会感兴趣的。

Lava from the Kilauea eruption, which began Jan. 3, 1983, has created more than 500 acres of new land along the Puna coastline. AP Photo/David Jordan

夏威夷的Kilauea 火山爆发始于1983年1月3日，喷发的火山岩已经沿着Puna 海岸线形成了500多亩新陆地。

The matrix consists dominantly of mylonized volcanic rocks, tuff and strongly fragmented pyroclastic rocks.

基质主要有糜棱岩化的火山岩、凝灰岩和破碎强烈的火山碎屑岩。

What it saw were volcanic rocks, which spectrometers indicated were composed of olivine and pyroxene, minerals broken down by even the barest amount of liquid water.

它看到的是火山岩，质谱仪显示组成是橄榄石和辉石，而这些矿物只要碰上一丁点儿液态水就会瓦解。

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。

Taking the Late Mesozoic basic-intermediate dike swarms from this area as the main object, we have studied their Petrology, Geochemistry and Isotopic Chronology, and discussed the property of their magmatic source, tectonic setting and origin as well. The significant conclusions acquired are as follows: 1, The Late Mesozoic dike from the coastland of Fujian Province appears as clusters, intruding into the Late Mesozoic granite or volcanic rocks, and the lithologies are diabase, hornblende diabase and quartz-diorite etc, mainly diabase. The mode of their occurrence is mainly precipitous and they tend towards NE, approximately EW or NNE. The dike swarms did not suffer metamorphose or distortion, holding the stress state as the dike formed.

本论文以该地区晚中生代中–基性岩墙群为主要对象，研究了它们的岩石学、地球化学及同位素年代学等，对岩浆源区的性质、构造环境、成因等进行了讨论，获得以下重要认识： 1、福建沿海地区晚中生代中–基性岩墙成群产出，侵入到晚中生代花岗岩及火山岩中，岩性有辉绿岩、角闪辉绿岩和石英闪长岩等，以辉绿岩类为主，产状较陡，北东、近东西及北北东走向，大多未发生变质或变形，保持了岩墙形成时的应力状态。

The key technique to determine the ages of young volcanic rocks by K-Ar and 40Ar- 39Ar methods is how to avoid effects of excess argon and to raise the relative component of radiogenic argon.

用K -Ar和4 0 Ar- 39Ar方法测定年轻火山岩年龄的技术关键在于如何有效规避过剩氩的影响和提高放射成因氩的相对含量。

The geochemical characteristic of rhyolitic rocks is also similar to that of rhyolite in the bimodal volcanics of the typical back-arc basin.

流纹质岩石地球化学特征也与典型弧后盆地双峰式火山岩中的流纹岩相似。

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。