火山沉积物

南海深海晚第四纪火山沉积物及其起源探讨

Research on volcanic sediments and origin of volcanic substance in South China Sea during late Quaternary

小冰穹冰芯除表层外，密度基本在800－900kg／m3之间，冰芯中雪冰互层，存在污化面，40m以下发现很厚的火山灰沉积物。

The density data of the ice core from the summit of Small dome showed the fluctuation between 800 and 900kg / m 3 except that of the very surface part , in which the snow and ice interleaved frequently and dust layers existed .

2009年，这个数十年的旧理论被增添了更多佐证。在印度东海岸进行石油钻探时，有一家石油公司发现了亿万年之久的火山岩沉积物。

This decades old theory was given more credence in 2009 , when oil companies drilling below the ocean surface off the east coast of India found eons old lava filled sediments .

近黑色的结构是几乎可以肯定的火山灰丰富的沉积物了沙丘。

The nearly black structures are almost certainly dunes made of volcanic ash-rich sediments .

陆坡下部区的火山碎屑及浊流沉积物中放射虫化石亦不丰富。

In the low area of continental slope , radiolaria fossils are poor in the volcanic cinders and turbidite .

二是盆地西侧火山岩源区沉积物的大量供给。

A good supply of sediments from the volcanic rock source region in the western side of the basin .

火山层序是指由于火山作用导致的火山物质（包括沉积物）在盆地内的充填所形成的层序，通常发育在断陷盆地的早期阶段，由火山岩、火山碎屑岩、凝灰岩和沉积岩所构成。

Volcanic sequence composed of volcanic , pyroclastic , tuff and sedimentary rocks is formed by the filling of volcanic substances ( including sediments ) in a basin during the time of volcanic activities .

阳信洼陷含火成岩地层层序具有火山沉积特征，其主控因素为构造运动、火山作用、沉积物供给与湖平面变化等。

The sequences contain igneous rocks with volcanic sedimentary characteristics , and their main control factors include tectonic volcanism , sediment supply and lake level change and so on .

火山活动的主震时期产生了大量的主酸性以及基性火山岩，并伴随着火山碎屑沉积物，且其中包含着分离的煤层。

The principal period of volcanic activity produced large volumes of mainly acid and basic volcanic rocks accompanied by volcaniclastic sediments which contain isolated coal seams .