| 1. | Basic features and genesis of the early - middle cambrian epoch volcanics in the xiangmaoshan district of western part of northern qilian
中寒武世基性火山岩基本特征及其成因 |
| 2. | All the mafic and felsic volcanic - hosted massive sulfide deposits are therefore defined as the kunlun type volcanic - hosted massive copper sulfide deposit
这些基性火山岩型和酸性火山岩型矿床被统称为昆仑式火山岩型块状硫化物铜矿床。 |
| 3. | Based on the rock ' s chemical analysis and compare of rare - earth element , it can see that the deposit gold origin chiefly possess two kinds : ( 1 ) the volcanic rock ; ( 2 ) golden fluid medium
根据岩石化学分析和稀土元素对比，可以看出该矿床金的来源主要有两种：基性火山岩系；含金流体。 |
| 4. | Was made up of thick neutral and basic volcanics , volcanoclastic rocks and few normal sedimentary rocks . the sedimentary rocks of tiaohu fm . were mainly composed of terreverte or mauve mudstone , sandstone and glutenite
条湖组的分布范围与芦草沟组大致相当，但岩性却差异很大，为厚层中?基性火山岩、火山碎屑岩，是火山活动频繁的证据，条湖组沉积岩夹在火山岩中间，主要为灰绿、紫红色泥岩、砂岩及砂砾岩。 |
| 5. | The lower part formed in a littoral - epeiric environment , is a series of elastic rocks , partly contains carbonate rock and metamorphic basic volcanic rocks and the upper part formed in a bathypelagic environment is a series of sediments with chert , partly contains metamorphic basic volcanic rocks
其下部为一套滨浅相碎屑岩，局部夹碳酸盐岩、变质基性火山岩；上部为一套深水沉积岩系夹硅质岩，局部夹变质基性火山岩。 |
| 6. | 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。 |
| 7. | These deposits , which can be obviously divided into basic and acid volcanic types , are present in the carboniferous bi - model volcanic series and occur along two horizons , i . e . , the lower carboniferous mafic volcanic rock and the upper carboniferous felsic volcanic rock
这些矿床产在石炭系双峰式火山岩系之内，沿著下石炭统基性火山岩和上石炭统酸性火山岩两个层位产出，分别以玄武岩和流纹岩为容矿主岩，可以明显地分成基性火山岩型和酸性火山岩型两种类型。 |
| 8. | Permian series distributed widely in the baisin . lower permian series was composed of acid , neutral , and basic volcanics , subvolcanic rocks , volcanoclastic rocks and few normal sedimentary rocks . from western to eastern , the volcanics transited from acid volcanics to neutral and basic volcanics
二叠系在盆地内部分布广泛，下二叠统卡拉岗组主要发育酸、中、基性火山岩、次火山岩、火山碎屑岩及少量正常碎屑岩，由西向东火山岩由中、酸性向中、基性过渡。 |
| 9. | On the basis of detailed and systematic studies on the petrography , major and trace elements and sr - nd isotopic data of mesozoic volcanic rocks , especially the mafic volcanic rocks in yanshan area , we successfully studied the deep processes related to magma generation and their relationship with shallow - level tectonic evolution . the major conclusions are summarized as below . 1
论文通过对燕山地区中生代火山岩，特别是中基性火山岩，进行详细而系统的岩石学、主微量元素地球化学特征和sr - nd同位素组成特征的研究，主要取得了以下研究成果： 1燕山地区中生代( j - k )火山岩为一套钙碱性-高钾钙碱性-橄榄安粗岩系列岩石。 |
| 10. | 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。 |
