| 山东蓝宝石原生矿床成因探讨 |
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| 关键词:sapphire alkali basalt mantle-derived xenolith Changle area in Shandon |
| 基金项目:国家自然科学基金 |
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| 摘要: |
| Study on the Origin of the Sapphire Deposit in the Changle Area, Shandong |
| Late Tertiary basalts are widely distributed in the Cha ngle area, Shandong provine. The eruption of basalts in this period was tectonic ally controlled by the Yimu fault of the continental rifting type. The eruption of the basalt magma was flooding rather than explosive. The host basalts of sap phires have higher K 2O+Na 2O, Al 2O 3 and TiO 2 and lower SiO 2, than sap phire-free basalts.The data points fall in the alkali basalt field on the (K 2O +Na 2O)-SiO 2 diagram. The sapphire-bearing basalts contain abundant iherzolit es that belong to the remnants of the upper mantle left after the removal of bas altic melts from partial melting of the upper mantle.Minerals in iherzolites are in an equilibrium state. Using the geothermometer and geobarometer , the equil ibrium temperature and pressure of the minerals in iherzolites were estimated to be 1100 ℃ and 1.5 GPa, respectively. The sapphires are the product of early cry stallization of alkali basalt magma and intergroom with clinopyroxene, feldspar, garnet and zircon megacrysts. |
| DONG Zhen-xin,YANG Liang-feng,WANG Yue-wen.1999.Study on the Origin of the Sapphire Deposit in the Changle Area, Shandong[J].Acta Geoscientica Sinica,20(2):177-183. |
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