庐枞火山岩系与偏碱性石英正长岩带的同源特征及成因探讨 |
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引用本文: | 翟建平,徐光平,章邦桐,胡 凯. 庐枞火山岩系与偏碱性石英正长岩带的同源特征及成因探讨[J]. 地质论评, 1999, 45(7): 707-711 |
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作者姓名: | 翟建平 徐光平 章邦桐 胡 凯 |
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作者单位: | 南京大学地球科学系,南京大学成矿机制研究国家重点实验室,210093 |
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摘 要: | 庐枞火山岩系与由黄梅尖、城山和大龙山3个岩体组成的偏碱性石英正长岩带在野外紧密共生,他们的RbSr等时线年龄在分析误差范围内相当一致,约为135 Ma,87Sr/86Sr初始比和Nd、Pb同位素组成也很相似,显示了成因上的渊源关系以及成岩物质来源较深且受到了上部地壳的混染等特征,反映了深部地质构造条件对岩浆活动的制约。
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关 键 词: | 火山岩 石英正长岩 Sr-Nd同位素 Pb同位素 裂谷 |
Comagmatic Characteristics of the Luzhong Vocanic Rocks and Subalkaline Quartz Syenite Rock-Belt and Their Genesis |
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Affiliation: | Department of Earth Sciences, State Key Laboratory of Mineral Deposits, Nanjing University,210093 |
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Abstract: | The Luzhong vocanic rocks and subalkaline quartz syenite rock belt whi ch consis ts of the Huangmeijian, Chengshan and Dalongshan batholiths are paragenetic a nd very similar in such characteristics as forming age, ge ology,mineralogy and petrology, petrochemistry, rare earth elements and trace el ements,isotopic compositions of Sr,Pb,Nd etc.,which shows that their origin ma y be alike. The magmas, which were related closely in genesis with the te ctonic activities in the depth, were derived from the mantle through partial me lting and contaminated by the crustal materials in the process of upwar d movement and emplacement along the deep faults. |
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Keywords: | vocanic rock quartz syenite Sr,Nd isotope Pb isotope rift |
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