| 绿岩套和蛇绿岩套的区分标志 |
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| 引用本文： | 郑新华,白文吉.绿岩套和蛇绿岩套的区分标志[J].岩石矿物学杂志,1988,7(3):193-202. |
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| 作者姓名： | 郑新华 白文吉 |
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| 作者单位： | 中国地质科学院地质研究所
(郑新华)，中国地质科学院地质研究所(白文吉) |
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| 摘 要： | 综合绿岩、蛇绿岩的有关概念、地质环境、岩石学、地球化学特征,论述蛇绿岩和绿岩之间的异同。 目前由于太古宙和显生宙地质构造研究的进展,使人们对绿岩套和蛇绿岩套的特征及其相互之间的异同性、联系性和形成环境越来越感兴趣。同时,在不同地区的地质构造研究中,对上述两种岩套在概念上和成因上存在混淆。本文将讨论这一问题。
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| 关 键 词： | 绿岩 蛇绿岩 标志 |
A Comparison Between Greenstone Suite and Ophiolite Suite |
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| Zheng Xinhua Bai Wenji.A Comparison Between Greenstone Suite and Ophiolite Suite[J].Acta Petrologica Et Mineralogica,1988,7(3):193-202. |
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| Authors: | Zheng Xinhua Bai Wenji |
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| Abstract: | The importance of the greenstone formations preservative in the cratons and the ophiolite complexes present in the geosynclines of China has become increasingly recognized during the last few years.The purpose of this paper is to make a comparison between greenstone suite and ophiolite suite and to show their differences.It is well known that the greenstone and the ophiolite are actually different both in their concepts and characters. The authers have made in this paper the comparison between them using the data from the world.It is believed that greenstone belts were derived from Archean basin with sialic basement and ophiolites were formed in the oceanic basin with simatic basement. Greenstone belt is as an autochthonous volcanic-sediment located within the cratons, while ophiolite is regarded as an allocthon emplaced into the geosyncline. In general, the age of greenstone is confined to Archean and ophiolite belongs to phanerosoic age. Greenstone sequence can be divided into three divitions (or subsequences), from the lower to the upper horizon, they are ultramafic layer (including komatiites), mafic volcanic layer, sialic volcanic and sedimentary layer. In the ophiolite sequence peridotite tectonite occurs as a basement in the lower part, and in the middle of section there occur the cumulative rocks which on the top are overlain by the mafic lava. Unlike the ophiolite sequence, the greenstone sequences have lock of sheeted dyke complex. The volcanic rocks of greenstone in petrochemistry exhibit generally a bimodal suite which is absented for volcanic of ophiolites. The greenstone sequence shows generally 1-3 or more cycles of development, and ophiolite suite has only one sequence.In addition, greenstone suite differs from ophiolite sutite either in geochemistry and REE, or in metamorphism, tectonics, and mineralizations. |
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| Keywords: | greenstone ophiolite |
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