| 甘肃北山小草湖超单元地质特征 |
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| 引用本文： | 宋秉田.甘肃北山小草湖超单元地质特征[J].甘肃地质学报,2007(Z1):11-16. |
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| 作者姓名： | 宋秉田 |
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| 作者单位： | 甘肃省地矿局第四地勘院 甘肃酒泉735000 |
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| 基金项目： | 中国地调局甘肃1∶25万红宝石幅区域地质调查(项目编号200213000020)的成果 |
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| 摘 要： | 小草湖超单元是北山地区最晚一期的花岗侵入岩体,从早到晚依次可划分为花岗闪长岩单元,斑状二长花岗岩单元,黑云母二长花岗岩单元,含白云母二长花岗岩单元共4个单元。侵入于石炭纪扫子山组和华力西中晚期四顶黑山序列及印支早期马鞍山北超单元中,形成时代为晚三叠纪,属印支晚期花岗质侵入岩体。各单元间为脉动型侵入接触关系。岩石化学成分及地球化学特征显示具“S”型花岗岩的特征,形成于板块同碰撞期到碰撞后期的造山环境。
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| 关 键 词： | 小草湖 花岗质岩体 印支期 碰撞后期 |
GEOLOGICAL FEATURES OF GRANITIC
INTRUSIVE IN XIAOCAOHU |
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| SONG Bin-tian.GEOLOGICAL FEATURES OF GRANITIC
INTRUSIVE IN XIAOCAOHU[J].Acta Geologica Gansu,2007(Z1):11-16. |
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| Authors: | SONG Bin-tian |
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| Institution: | SONG Bin-tian(No.4 Geology and Exploration Team,Gansu Provincial Bureau of Geology and Mineral Exploration and Development,Jiuquan 735000,China) |
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| Abstract: | Xiaocohu granitic intrusive body which belongs to the latest stage of granitic intrusive body is divided into such 4 units as granodiorite unit,porphyritic monzogranite unit,biotite monzogranite unit,muscovite monzogranite unit from early to late stage.They are grouped into granite of Late Indo-Chinese epoch,which intruded into Saozishan Formation of Carboniferous Period,Sidingheishan Sequence of Middle-Late Variscan Age,and super-unit of Late Indo-Chinese epoch at Late Triassic Period.Pulsating intrusive contact exist between each unit.The result of chemical composition and geo-chemical features reveal that the rock is characterized by S-type granite,and formed in oroginic environment from plat syn-collisional period and late collisional period. |
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| Keywords: | Xiaocaohu granitic body Indo-Chinese epoch late conllisional period |
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