| 南极罗斯岛及泰勒谷新生代火山岩微量元素特征及岩石成因 |
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| 引用本文： | 石林,解广轰.南极罗斯岛及泰勒谷新生代火山岩微量元素特征及岩石成因[J].极地研究,1995,7(3):47-55. |
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| 作者姓名： | 石林 解广轰 |
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| 作者单位： | 中国科学院广州地球化学研究所 |
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| 摘 要： | 本文对采自南极罗斯岛及泰勒谷的新生代火山岩（包括鸟角碱玄岩、伊万思角歪长粗面响岩、罗德角碱玄响岩、克雷特山碱玄岩、碧玄岩博尼湖南岸碧玄岩）中的微量元素、稀土元素及同位素进行了系统的研究。查明研究区的火山岩未遭受地壳混染；证实它们可能来自两种不同的地幔源区。在岩浆演化方式上两套岩石也有所不同，碱玄岩和碧玄岩以地幔平衡部分熔融作用为主，而粗面响岩、碱玄响岩则以分离结晶作用为主。地幔部分熔融度为１．４６～３．５７％。最后对该区地幔的性质进行了初步讨论
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| 关 键 词： | 南极 火山岩 微量元素 地幔源区 |
CHARACTERISTICS OF TRACE ELEMENTS AND GENESIS OF CENOZOIC VOLCANIC ROCKS FROM ROSS ISLAND AND TAYLOR VALLEY,ANTARCTICA |
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| Shi Lin,Xie Guanghong.CHARACTERISTICS OF TRACE ELEMENTS AND GENESIS OF CENOZOIC VOLCANIC ROCKS FROM ROSS ISLAND AND TAYLOR VALLEY,ANTARCTICA[J].Chinese Journal of Polar Research,1995,7(3):47-55. |
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| Authors: | Shi Lin Xie Guanghong |
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| Abstract: | This paper studies systematically trace elements,REE and Sr isotopes of rocks collected from 5 different regions of Ross Island and Taylor Valley, Antarctica . Ratios of 87 Sr/ 86 Sr in all samples range from 0.703000 to 0.704532.Ratios of Th/Ta and Hf/Sm in volcanic rocks of each region are essentially constant,they can be classified into two groups.One group includes the samples from Cape Bird, Crater and southern bank of Bonney Lake. Their average ratios of Th/Ta and Hf/Sm are about 1.0773 and 0.8144 respectively.The other group includes the samples from Cape Evens and Cape Royds.Their average ratios of Th/Ta and Hf/Sm are about 0.1460 and 1.6580. All the features indicate that magma in the study area are almost free from contamination with crustal substance and probably derived from the two different magma sources in the mantle.All the dots of samples on La/Sm La and Ce/Yb Ce evince two different trends of magma differentiation, one of which including tephrite,basarite is considered as a major result of partial melting of equilibrium in the mantle,and the other including trachyte,ventrllite as a result of magma fractional crystallization. The fusibility of magma in mantle is about 1.46-3.57%.Properties of the mantle in the regions are also discussed generally. A conclusion is drawn that the first group is probably derived from magma resources of enrichment in LREE,U,Ta and so on. |
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| Keywords: | s Antarctica volcanic rocks trace elements magma sources in mantle |
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