felsic rock meaning in English
长英质岩石
Examples
- A large number of studies of geochronology and geochemistry indicate that mesozoic intermediate - felsic rocks from the dabie orogen have originated from recycling of the subducted yangtze continental crust itself
摘要大量的同位素地质年代学和地球化学研究表明，大别山中生代中酸性岩为俯冲扬子陆壳再循环的产物。 - All of the mafic samples have age - corrected moderate enriched sr and enriched nd isotopic ratios and the felsic rocks span larger range in the initial sr and nd isotopic ratios than mafic volcanics , similar to isotopic compositions of lower crust of north china block
在sr - nd同位素组成上，中基性火山岩为中等富集的sr和低的nd同位素比值；中酸性火山岩的sr同位素比值总体较中基性岩高且变化大，类似华北陆块下地壳岩石的同位素组成特征。 - A ree partition simulation suggests that the tianzhushan intermediate rocks can be generated by partial melting , in coupling with fractional crystallization , of dioritic gneiss which is similar in chemical compositions to the mafic rocks in the lower crust in north dabie ; partial melting of intermediate grey gneiss which is similar in chemical compositions to the middle crust in north dabie can generate the tianzhushan felsic rocks
Ree配分的定量模拟计算结果表明，与基性下地壳相似的北大别基性闪长质片麻岩部分熔融并经过结晶分异能够形成与天柱山中性岩类似的稀土元素组成，而与中性地壳相似的北大别中性灰色片麻岩部分熔融能够形成与天柱山花岗岩类似的稀土元素组成。 - 2 . early jurassic mafic volcanic rocks in yanshan area were derived from decompression melting of an ancient continental lithospheric mantle , which had been previously metasomatized by subducted slabs during the closure of paleo - asian ocean ; the mantle source of late jurassic mafic volcanic rocks were contributed by dominant emi and insignificant subducted metasomatic components ; early cretaceous mafic volcanic rocks were derived from decompression melting of an ancient continental lithospheric mantle ( emi ) . with regard to the basaltic lavas , the felsic rocks resulted from partial melting of continental crust , which closely related to basaltic underplating
2燕山地区早侏罗世中基性火山岩来自于早期俯冲交代的古老岩石圈地幔部分熔融作用，俯冲交代作用可能与早期古亚洲洋闭合事件有关；晚侏罗世中基性火山岩更多来自于类似于emi型地幔源区的部分熔融作用，俯冲交代成分贡献很弱；早白垩世基性火山岩则来自于emi型地幔源区的部分熔融作用。 - Among the felsic rocks , samples from the zhangjiakou formation ( fm . ) are characterized by moderately to strongly eu anomalies , and variable negative anomaly of sr , ti and p , whereas samples from the donglingtai fm . exhibit enriched lree and flat hree patterns with nb / ta fractionation and high zr / sm ratios
在中酸性火山岩系列中，张家口组火山岩表现出中等-强烈的eu负异常和不同程度的sr 、 ti 、 p负异常；东岭台组火山岩表现出富集lree和平坦的hree的稀土配分模式， nb ta分馏，高zr sm比值。