| 内蒙古呼盟南部地区古生代海相火山岩地球化学特征及其地质意义 |
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| 引用本文： | 祝新友,刘国平.内蒙古呼盟南部地区古生代海相火山岩地球化学特征及其地质意义[J].岩石矿物学杂志,1995,14(2):109-118. |
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| 作者姓名： | 祝新友 刘国平 |
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| 作者单位： | 中国有色总公司北京矿产地质研究所 |
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| 摘 要： | 全区泥盆系、石炭系发育厚层海相火山建造。下大民山组（Ｄ３ｘ）火山岩为基性一中基性，属拉斑玄武岩和碱性玄武岩的过渡物，成因是地幔岩部分熔融，形成于大陆边缘孤后盆地裂谷作用的早期环境；在下大民山组顶部的岩屑凝灰岩中首次发现铁矿浆浆屑，也反映全区于中泥盆世－晚泥盆世早期为大陆边缘裂谷环境。上大民山组（Ｄ３ｓ）为基性一酸性火山岩，属岛孤钙碱性系列，为结晶分异成因，形成环境类似于安第斯山之火山弧。早石炭世火
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| 关 键 词： | 内蒙古 火山岩 岩石化学 地球化学 稀土族 |
Geochemical Characteristics of Paleozoic Marine Volcanic Rocks in Southen Hulun Buir League,Inner Mongolia,and Their Geological Significance |
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| Zhu XiDyou,Liu Guoping.Geochemical Characteristics of Paleozoic Marine Volcanic Rocks in Southen Hulun Buir League,Inner Mongolia,and Their Geological Significance[J].Acta Petrologica Et Mineralogica,1995,14(2):109-118. |
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| Authors: | Zhu XiDyou Liu Guoping |
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| Abstract: | There exists the thick-bedded formation of Hercynian marine volcanicrocks in southern Hulun Buir League,Inner Mongolia.The basic volcanic rocksof Late Devonian Lower Daminshan Formation(D_3x)with a steeply-dippingREE distribution curve are complex of theoleiite and alkaline bsalt,indicating that their formation environment from the middle Devonian to the Early stageof Late Devonian was originally a peroiod of back-are rifting in the continent margin and that they might be products of partial melting of the mantle .Theiron magma debris discovered for the first time in the debris tuff at the top of the formation also supports this conclusion.The basic-acid rocks of Late Devonian Upper Daminshan Formation (D_3s)are considered as arc calc-alkaline volcanic series that resulted from the crystallization and differentiation of magma,Their tectonic environment was probably an volcanic arc along the active contiDental margin, similar to things of andes Mountains.The Lower Carboniferous volcanc rocks are of alkaline series that erupted in an intraplate environment.Studies of petroloraery,petrochemistry rare earth elements as well as geote-ctonic environment fail to support the argument that the metallogenic condi-tion is very favorable for the formation of marine volcanics-hosted copperdeposits. |
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| Keywords: | Inner Mongolia volcanic rock petrochemistry REE geochemistry tectonic setting |
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