| 天姆尖破火山口碎斑熔岩的发现及其意义 |
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| 引用本文： | 林子瑜,陈名佐,等.天姆尖破火山口碎斑熔岩的发现及其意义[J].地质与勘探,2002,38(2):55-58. |
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| 作者姓名： | 林子瑜 陈名佐 |
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| 作者单位： | 核工业地质局270研究所,南昌,330200 |
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| 摘 要： | 赣杭带东段天姆尖地区首次识别出大面积分布的碎斑熔岩体系,它具有典型的喷溢相－侵出相一次火山岩相“三相一体”特征,在岩石化学成份上表现为富硅,碱,铁而贫镁,锰,钙,岩石结晶分异指数为77－93,稀土元素铕亏损明显,放射性成因铀铅含量高,岩石蚀变表现为面式分布,具前锋带特点,这一发现对赣杭带寻找新的富大铀矿远景区有着重要的指标意义。
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| 关 键 词： | 天姆尖 碎斑熔岩 破火山口 放射性 铀矿床 赣杭构造带 相山 热液蚀变 |
| 文章编号： | 0495-5331(2002)02-0055-04 |
| 修稿时间： | 2001年8月6日 |
DISCOVERY OF PORPHYROCLASTIC LAVA IN TIANMUJIAN CALDERA AND ITS SIGNIFICANCE |
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| LIN Zi-yu,CHEN Ming-zuo,XU Jin-shan.DISCOVERY OF PORPHYROCLASTIC LAVA IN TIANMUJIAN CALDERA AND ITS SIGNIFICANCE[J].Geology and Prospecting,2002,38(2):55-58. |
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| Authors: | LIN Zi-yu CHEN Ming-zuo XU Jin-shan |
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| Abstract: | A large area of porphyroclastic lava at Tianmujian caldera in Ganhang belt was identified for the first time. The lava has typical characteristic of "three facies around one caldera", and is chemically rich in Si, alkali, Fe and dilution in Mg, Mn, and Ca. The lava has also high differentiation index and lead decayed from uranium. The REE pattern has remarkable depletion of Eu. The rock alteration is widely planar distribution and has the characteristic of the margin zone. This discovery has significance for the future uranium prospecting. |
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| Keywords: | Tianmujian porphyroclastic lava caldera |
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