鲁西昌乐新生代碱性玄武岩中刚玉,蓝宝石的矿物学特征和其成因探讨.pdfVIP

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鲁西昌乐新生代碱性玄武岩中刚玉,蓝宝石的矿物学特征和其成因探讨.pdf

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Advances in Geosciences 地球科学前沿, 2016, 6(2), 115-128 Published Online April 2016 in Hans. /journal/ag /10.12677/ag.2016.62015 Mineral Characteristics and Origin Discussion of Corundum/Sapphire in Cenozoic Alkali Basalts of the Changle, Western Shandong, China Shuang Chen, Xuping Li, Fanmei Kong, Lingquan Zhao, Hongkai Chen Shandong Provincial Key Laboratory of Depositional Mineralization Sedimentary Minerals, College of Geological Science Engineering, Shandong University of Science and Technology, Qingdao Shandong th th th Received: Apr. 9 , 2016; accepted: Apr. 26 , 2016; published: Apr. 29 , 2016 Copyright © 2016 by authors and Hans Publishers Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). /licenses/by/4.0/ Abstract On the basis of EPMA and LA-ICP-MS modern analysis methods, we systemically investigate the che- mical characteristics of the Changle corundum/sapphire minerals, and explore the origin of the Changle corundum/sapphire in Cenozoic alkali basalts. The general content of impurity in the Chan- gle corundum/sapphire is low, which is 1.73%~0.21% in total, and is variable in different samples. Among the impurity elements in Changle samples, the concentration of Fe is the highest, and it’s sig- nificantly higher than the basalt type sapphires from other origin places. Ga content is higher than 100 ppm in the Changle corundum/sapphire, showing a magma type in origin. The fracture devel- oped corundum presents a significant late melt infiltration and alteration. By the associated alkali feldspar within the margin of corundum crystal, preliminary estimate indicates that the formation of corundum/sapphire conditions should be close to or more than 10