( 3 ) jianchaling ultrabasic intrusion belongs to magnesian ultrabasic simple rock - body , close related with yangzi block in space , which formed in the interim of proterozoic active tectonic zone to phanerozoic orgenic belt ( 3 )证实煎茶岭超基性岩体为含铁的镁质超基性单式岩体,空间上与扬子地块关系密切,形成于新元古代由元古宙活动带向显生宙造山带过渡时期。
Therefore , based on the isotopic chorology , petrochemistry , geochemisty and sr , nd , pb isotope , the ph . d dissertation mainly studied some yanshanian mafic dikes , volcanic rocks and alkalic - ultramafic dikes in shandong province 本论文主要从同位素年代学、岩石化学、地球化学和sr ? nd ? pb同位素方面对山东地区燕山期基性脉岩、火山岩和碱性超基性脉岩进行了系统研究。
The nickel deposits in china can be sort into three kinds , i . e . the ultra - basic related , ultrabasic - basic related , and neutral - basic related , of which present obvious specialty on magmatic origin and geochemistry 特别是将我国与侵入岩有关的镍矿床分为与超基性岩有关、与超基性?基性岩有关和与中性?基性岩有关的三类,表现出明显的岩浆岩成矿专属性和地球化学专属性。 3
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。
A comparison of the prospecting model of the hf type with the prediction model of the vms type reveals that their thermal dynamic mechanisms are different : the former is related to basic - ultrabasic rock intrusion , while the latter to acidic rock intrusion 与白银铜矿区域地球化学预测模式相比较,富铁型铅锌矿床中除铁族元素指示基性超基性岩侵入事件外,其他元素均大致相似,两大类矿床形成的初始热动力条件不同。
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。
Under the cooperation of lifts and mantle fluids , the melting point of mantle peridotite fell , and then , extensive melting took place in the enriched mantle , which resulted in the appearance of abundant mafic dikes , ultramafic dikes and contemporaneous volcanic rocks in shandong province 综合碱性超基性脉岩和已知的青山组的火山岩、基性脉岩年龄数据,认为山东地区中生代地壳拉张至少存在四次:即约80ma 、 100ma 、 120ma和140ma 。
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。
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。
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。