| 鲁西峄山花岗岩中粗大钾长石斑晶成因探讨 |
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| 引用本文： | 仲卫国,王聿军,臧学农,董作森. 鲁西峄山花岗岩中粗大钾长石斑晶成因探讨[J]. 山东国土资源, 2005, 21(6): 64-66 |
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| 作者姓名： | 仲卫国 王聿军 臧学农 董作森 |
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| 作者单位： | 山东省第七地质矿产勘查院,山东,临沂,276006;山东省第七地质矿产勘查院,山东,临沂,276006;山东省第七地质矿产勘查院,山东,临沂,276006;山东省第七地质矿产勘查院,山东,临沂,276006 |
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| 摘 要： | 在鲁西地区新太古代晚期(五台期)峄山花岗岩的黑石查和望子山花岗质岩体的岩石中,钾长石粗大斑晶内有自形程度较高的斜长石等矿物包裹体沿其环带定向排列.根据野外观察及岩石、矿物学特征测试分析,钾长石斑晶属于岩浆结晶形成的原生斑晶,受化学成分及侵位结晶过程中的物理化学条件影响,钾长石的生长速度大于其成核密度,因而形成粗大斑晶.估算岩浆温度＞950℃,钾长石斑晶快速生长时岩浆温度为750℃,过冷度△T≈150℃,基质结晶时岩浆温度为600℃,△T≈300℃.
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| 关 键 词： | 似斑状岩石 钾长石斑晶 峄山花岗岩 新太古代 过冷度 鲁西 |
| 修稿时间： | 2004-12-20 |
Origin Study on Porphyritic Crystals in Coarse Feldspar of Yishan Granites in Western Shandong |
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| ZHONG Wei-guo,WANG Yu-jun,ZANG Xue-nong and DONG Zuo-sen. Origin Study on Porphyritic Crystals in Coarse Feldspar of Yishan Granites in Western Shandong[J]. SHANDONG LAND AND RESOURCES, 2005, 21(6): 64-66 |
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| Authors: | ZHONG Wei-guo WANG Yu-jun ZANG Xue-nong DONG Zuo-sen |
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| Abstract: | Main Porphyritic-like Texture Rock of Yishan superunit belongs to Heishicha unit and Wangzishan unit, the potash feldspar porphyritic is bulky , high self-shape plagioclase crystalloids and other mineral crystalloids arrayed along the zone of the feldspar porphyritic. According to field survey and analysis on lithofacies, porphyritic crystals of feldspar belong to primary crystals formed by magma crystallization. Effected by chemical composition and physical and chemical condition during intrusion and cryst... |
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| Keywords: | Porphyritic-like rock crystals of feldspar granites in Yishan superunit Neo-archaean super-cooling temperature western Shandong |
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