青岛崂山劈石口深源脉岩岩浆起源与演化——矿物化学与锆石年代学证据
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摘要
青岛劈石口煌斑岩侵位于青岛崂山花岗岩中。从化学组成上看,其SiO2含量极低(33.61%~39.81%),TiO2含量高(2.46%~3.57%),全碱含量(ALK)w(K2O+Na2O)在3.32%~5.69%之间,Mg#值在75~79之间,属超铁镁质碱性煌斑岩;岩石轻重稀土分异明显,富集轻稀土、亏损重稀土;富集大离子亲石元素Ba、Th、U、Pb等,亏损K元素;亏损Zr、Yb等高场强元素。从矿物化学上看,样品中辉石基本全部属于富Ca、Mg、Ti的透辉石;辉石具有高Aliv和低Al vi的特征表明其形成于温度相对较高、压力相对较低的环境中。劈石口煌斑岩中存在大量捕获锆石,这些锆石中包含了华北地区基底形成及多期岩浆、变质等事件的信息。综合岩石地球化学、矿物化学、锆石年代学和区域地质背景,推断劈石口煌斑岩形成于中国东部中生代拉张环境中,与软流圈地幔存在一定成生关系。
The Pishikou lamprophyre dikes intrude into the Laoshan granites of Qingdao.From the chemical composition aspect,the Pishikou lamprophyres have a low SiO2 content(33.61%~39.81%)and a high TiO2 content(2.46%~3.57%)with the content of(ALK)w(K2 O+Na2 O)from 3.32%to 5.69%and the Mg#value from 75 to 79,which show that they should be ultramafic alkaline lamprophyres.The lamprophyres exhibit apparent differentiation of rare earth elements by the enrichment of LREE and the loss of HREE.They are relatively enriched in most of LILE(such as Ba,Th,U and Pb)and are loss of K and most of HFSE(such as Zr and Yb).From the mineral chemistry aspect,pyroxene in the lamprophyre samples all belong to diopside,which are riched in Ca,Mg and Ti.The high Aliv and low Al vi of diopside in the samples indicate that they have formed at relatively high temperatures and lower pressures.There are a number of captured zircons in the samples,which contain the information of multi-periods magmatic and metamorphic events.Taking geochemical,mineralogical chemistry,chronology and geologic background of Pishikou lamprophyres into consideration,the author deduce that the Pishikou lamprophyres have formed in the Mesozoic extensional environment in eastern China and may relate to asthenospheric mantle to some estent.
The Pishikou lamprophyre dikes intrude into the Laoshan granites of Qingdao.From the chemical composition aspect,the Pishikou lamprophyres have a low SiO2 content(33.61%~39.81%)and a high TiO2 content(2.46%~3.57%)with the content of(ALK)w(K2 O+Na2 O)from 3.32%to 5.69%and the Mg#value from 75 to 79,which show that they should be ultramafic alkaline lamprophyres.The lamprophyres exhibit apparent differentiation of rare earth elements by the enrichment of LREE and the loss of HREE.They are relatively enriched in most of LILE(such as Ba,Th,U and Pb)and are loss of K and most of HFSE(such as Zr and Yb).From the mineral chemistry aspect,pyroxene in the lamprophyre samples all belong to diopside,which are riched in Ca,Mg and Ti.The high Aliv and low Al vi of diopside in the samples indicate that they have formed at relatively high temperatures and lower pressures.There are a number of captured zircons in the samples,which contain the information of multi-periods magmatic and metamorphic events.Taking geochemical,mineralogical chemistry,chronology and geologic background of Pishikou lamprophyres into consideration,the author deduce that the Pishikou lamprophyres have formed in the Mesozoic extensional environment in eastern China and may relate to asthenospheric mantle to some estent.
引文
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