| 金伯利岩及有关岩类中的石榴石 |
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| 引用本文： | 张儒瑗,杨美娥,胡嘉瑞.金伯利岩及有关岩类中的石榴石[J].地质科学,1978,13(2):134-148. |
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| 作者姓名： | 张儒瑗 杨美娥 胡嘉瑞 |
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| 作者单位： | 山东地质局第七地质队 |
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| 摘 要： | 镁铝榴石是金刚石的常见伴生矿物,由于经常在自然重砂中出现,因此利用重砂法来寻找金刚石原生矿是一种有效的方法。但是镁铝榴石不仅在金伯利岩中,而且往往在某些基性、超基性、以及某些高级变质岩中出现,使找矿工作复杂化。为此,探寻与金刚石有成因联系的镁铝榴石和其他镁铝榴石之区别是很必要的。
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| 关 键 词： | , |
DISCUSSION ON GARNET IN KIMBERLITE AND RELATED ROCKS |
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| Zhang Ruyuan,Yang Meie.DISCUSSION ON GARNET IN KIMBERLITE AND RELATED ROCKS[J].Chinese Journal of Geology,1978,13(2):134-148. |
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| Authors: | Zhang Ruyuan Yang Meie |
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| Abstract: | This paper emphasizes the chemical composition and the origin of pyrope from kimberlite and related rocks. Among the 274 chemical analyses of kimberlite and related rocks cited here 78 are supplied by authors. They are calculated, grouped and compared.The preliminary remarks may be given as follows.1. There are two types of garnets in kimberlite. The first type is chrome-chrome-rich pyrope in ultramafic assemblage. For the content of Cr2O3 the purple series generally is greater than 2.5%, orange series is > 0.3%, while the values for garnets from the related rocks are usually lower. Furthermore, the calc-poor, chrome-rich and Fe-low or the calc-high, chrome-rich and Fe-low chrome-rich pyrope associated genetically with diamond may be regarded as ore guide. The second type is pyrope-almandine from eclogite assemblage, of which the composition is commonly hardly distinguishable from that of related rocks, although Mn/Fe2+ + Mn and Na2O differ in content.2. The chemical composition of pyrope from kimberlite shows some successive changes which allow us to infer the mineral studied is derived largely from kimber-litic magma and is polygenetic in nature. |
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