The paper based on synthesize domestic and foreign ' s study achievement about basalt , systematical review basalt research history , present condition about basalt formation contributing factor and it ' s magma source area quality , uses the basalt to distinguish the earth ' s mantle type , the connection basaltic magma evolution and continent dynamics , and uses the basalt to distinguish tectonic environment 系统地综述了玄武岩的成因和岩浆源区性质、利用玄武岩判别地幔类型、玄武质岩浆的演化与大陆动力学关系,以及判别构造环境等方面研究的现状。
Geologists have long known that water leaking into faults can trigger earthquakes , and nine days is about the same amount of time that they estimate it takes water to work its way down through cracks and pores in kilauea ' s fractured basaltic rock to a depth of five kilometers ? where the silent earthquake occurred 科学家早就知道,水要是渗进断层之内便会引发地震,而他们估计,雨水从裂缝和孔隙渗入奇劳亚火山破裂的玄武岩所需的时间,正好就是九天;渗透的深度达五公里,也就是无声地震发生的地方。
Four major rock types are found within the reserve . from the oldest to the youngest , they are the tuffs with volcanic bombs , granodiorites , porphyritic rhyolites and basaltic dykes , respectively . geomorphologically , the marine reserve has typical exposed rocky shore of south - easterly - directed capes and headlands in hong kong 鹤咀海岸保护区内可以找到四种主要岩石种类,以岩石形成的年代计算,最古老的是火山爆发形成的凝灰岩,然后依次是花岗闪长岩,流纹斑岩及玄武岩。
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。
An article of headgear since ascertained to belong to the much respected clerk of the crown and peace mr george fottrell and a silk umbrella with gold handle with the engraved initials , coat of arms and house number of the erudite and worshipful chairman of quarter sessions sir frederick falkiner , recorder of dublin , have been discovered by search parties in remote parts of the island , respectively , the former on the third basaltic ridge of the giant s causeway , the latter embedded to the extent of one foot three inches in the sandy beach of holeopen bay near the old head of kinsale 搜查队在本岛的偏僻地区发现了一顶帽子,已查明系属于那位备受尊重的法庭书记乔治弗特里尔640先生还有一把绸面雨伞金柄上镌刻着都柏林市记录法官641博学可敬的季审法院院长弗雷德里克福基纳爵士姓名的首字盾形纹章以及住宅号码。也就是说,前者位于巨人堤道642第三玄武岩埂上后者埋在古老的金塞尔海岬643附近霍尔奥彭湾的沙滩深达一英尺三英寸的地方。