查询词典 volcanic

Armed with this information and further analyses, Rumble, lead author Bekker, and colleagues propose the following scenario today in Science . Early in Earth's history, volcanic eruptions spewed massive amounts of sulfur dioxide into the atmosphere, where UV sunlight broke down the gas and created the odd sulfur isotope ratios. The sulfur descended with the rain and accumulated into sedimentary beds on the sea floor. Once there, superheated water from geothermal vents at various locations on the sea floor cooked the sulfur into sulfide. Finally, nickel-bearing magma welled up from Earth's mantle, combining with the sulfide to form nickel sulfide and encasing the compound inside volcanic rock called komatiite.

凭借这份资料和进一步的分析，朗布尔、研究论文的第一作者贝克及同事们今天在《科学》杂志上提出了如下的推测：在地球早期的历史上，火山爆发将大量的二氧化硫气体喷射到空中，太阳的紫外线将其分解，产生了奇特的硫同位素比值，这种硫随雨降下，积存于海底沉积层中；一旦到达海底，海底各处的地热出口所产生的温度过高的水把硫加热成硫化物；最终含有镍的岩浆从地幔中涌出，跟硫化物结合形成硫化镍，并将硫化镍包裹在一种叫做"科马提岩"的火山岩中。

Therefore Keller Peninsula is a revived caldera, and its volcanic activities are characteristic of migration of volcanic center with time.

因此凯勒半岛是一复活破火山，火山活动具有随时间迁移的特性。

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

Firstly, the volcanics and shaly sand were separated with FMI static images and conventional logging data. Then, the image characteristics of all typical volcanics were analyzed with the dynamic FMI images to establish the FMI image patterns of volcanic lava (including rhyolite, dacite, andesite, and basalt) and volcaniclastic rock (including volcanic breeds and tuff).

首先利用FMI静态图像和常规测井曲线将砂泥岩与火山岩区分开来；然后利用FMI动态图像分析了火山岩各种岩性的图像特征，归纳总结出火山熔岩类（流纹岩、英安岩、安山岩、玄武岩）和火山碎屑岩类的FMI图像模式。

Nearly 200 years, Japan's volcanic eruption for more than A, B volcanic levels.

近200多年来，日本的火山爆发多为A、B两级火山。

Exemplified by Jingpohu Holocene volcanic rocks, this paper has discussed the relationship between melt structure and volcanic eruptive mechanism.

本文以镜泊湖全新世火山为例，讨论了熔体结构和某些火山喷发机制的关系。

The theme of volcanic presented by Li Gang has the character of multiple powerful perception, not only the quiet state of brewing but also the unrest after breaking out, even the floweriness after the volcanic congealed.

李岗的火山主题具有着多重的力量感，既有酝酿积蓄的沉静状态，也有爆发后所袒露出来的动荡、肆虐，还有火山凝固后幻化出的绚烂与奇屈。

One is a bimodal volcanic assemblage, which formed during the rifting stage of the continental breakup theother is represented by flysch rocks, formed when the passive margin becomes stable. The composition of mafic rocks in the volcanic margin reflect their mantle origin and their crustal contamination. High temperature and low-pressure metamorphism can occur during the rifting stage and reflects a temporal trend of increasing temperature and decreasing pressure during the continental breakup.

被动陆缘的沉积建造由两套沉积物组成，一套是大陆解体的裂谷阶段所形成的陆相沉积物和双模式火山岩组合，另一套是稳定陆缘的复理石组合；岩装作用中基性岩类反应了物质直接源于上地慢的主要特点，并有部分受到地壳混染的特征；变质作用中高温低压环境主要发生在裂谷作用阶段，其特点反映了大陆解体过程中随着时间的增温和减压过程，而拆离伸展阶段则被脆性变形所代替。

Meanwhile, they show high abundances of Sr and Ba and high Sr/Y and La/Yb. The volcanic rocks have varied and enriched Nd isotopic compositions ε(subscript Nd=-11~-17, which plot intermediately between the field of the ancient continental crust and the field of the enriched subcontinental lithospheric mantle. These geochemical signatures indicate that the volcanic rocks of the Tiaojishan and Donglingtai Formations were originated from a process of hybridization between the enriched mantle-derived mafic magma and the lower continental crust.

火山岩的钕同位素成分变化大，且相当富集ε(下标 Nd=-11~-17，都分布在古老下地壳和富集地幔之间，因此推断北京西山地区髫髻山组火山岩和东岭台组火山岩的形成与富集地幔起源的基性岩浆与古老下地壳组分相互作用有关。

Rare samples of mother rock 'kimberlite', from Siberia, South Africa and Australia, displayed as an introduction to the geological section of the museum,- how diamonds originate from a volcanic magma, formed in the earth's mantle, 100 - 200 km below the earth's surface, and are transported through volcanic pipes to the earth's surface.

陈列了来自西伯利亚、南非和澳大利亚的罕见的金伯利岩样本。通过对它们的地质解理面的介绍，来说明钻石在火山岩浆中的形成过程，即钻石是在100~200公里的地幔中形成，随着火山爆发被喷射到地球表面。一个显示全世界钻石产量的模型（0.4立方米大小）是博物馆的精粹，就这0.4立方米的钻石，养活着全球200多万钻石业人。

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。