| 新疆巴楚爆破角砾岩筒矿物学特征及其对岩浆演化过程的约束 |
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| 引用本文： | 程志国,张招崇,张东阳,黄河.新疆巴楚爆破角砾岩筒矿物学特征及其对岩浆演化过程的约束[J].地质学报,2013,87(8):1104-1123. |
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| 作者姓名： | 程志国 张招崇 张东阳 黄河 |
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| 作者单位： | 中国地质大学地质过程与矿产资源国家重点实验室,北京,100083 |
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| 基金项目： | 本文为国家科技支撑计划（2011BAB06B02 04、2007BAB25B05） 和国家自然科学基金项目（ 0925006、40772045、40572047）资助的成果 |
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| 摘 要： | 本文对新疆巴楚爆破角砾岩筒的矿物学进行了系统的研究.结果表明:爆破角砾岩主要由胶结物和超镁铁质包体构成,胶结物的主要造岩矿物有单斜辉石、橄榄石、角闪石和金云母,它们既有金伯利质岩浆本身结晶出来的矿物斑晶,也有与超镁铁质包体同源的捕掳晶.胶结物中晚期结晶的矿物比早期结晶的矿物更加富镁,矿物环带表现为反环带,指示岩浆在演化过程中发生了一定程度的岩浆混合作用.研究发现爆破角砾岩中超镁铁质包体与周围的层状岩体在矿物学上存在诸多不同,暗示包体可能不是来自于后者.对比发现,巴楚金伯利岩与中国东部华北地台含矿金伯利岩在克拉通固结年龄、岩石圈厚度、岩石出露位置及岩浆来源深度等方面均存在很大不同,这些对巴楚金伯利岩成矿构成了不利因素.
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| 关 键 词： | 金伯利岩 捕掳晶 斑晶 反环带 新疆巴楚 |
| 收稿时间： | 2012/5/31 0:00:00 |
| 修稿时间： | 2012/10/19 0:00:00 |
Petrological and Mineralogical Characteristics of Explosion Breccia in Bachu, Xinjiang and its constraints on the magmatic processes |
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| chengzhiguo,ZhangZhaochong,Zhangdongyang and HuangHe.Petrological and Mineralogical Characteristics of Explosion Breccia in Bachu, Xinjiang and its constraints on the magmatic processes[J].Acta Geologica Sinica,2013,87(8):1104-1123. |
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| Authors: | chengzhiguo ZhangZhaochong Zhangdongyang and HuangHe |
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| Abstract: | Systematic studies on the main mineralogy of the diatreme breccias in the Bachu, Xinjiang, the results show that the rocks consist of two parts: xenoliths of ultramafic rock and cements. In the cements, the chiefly minerals are clinopyroxene, olivine, plagioclase and amphibole. They are both from the crystallization of the Kimberlitic magma and the xenocrysts which are the same source of the xenoliths of ultramafic rock. In the cements, the latter phenocrysts have higher Mg# than the previous phenocrysts and Clinopyroxene and amphibole develop the reverse zoning, which indicating that the magma has sufferd the magma mixing during its evolution. This study also shows that there are many mineralogy differences between the xenoliths of ultramafic rock and the Wajilitage layered complex, so we can say that they are no causal relationship between the two. On the craton age, the thickness of the lithosphere, rocks exposed position and the depth of the magma source, the Bachu kimberlite is different from the kimberlite of the eastern China, which constitutes a negative factor for the deposit. |
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| Keywords: | kimberlite xenocryst phenocryst reverse zoning Bachu Xinjiang |
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