福建岱前山辉长岩体的地球化学特征与成因探讨
GEOCHEMISTRY AND GENESIS OF DAIQIANSHAN GABBRO, FUJIAN PROVINCE
查看参考文献33篇
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文摘
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岱前山辉长岩体沿福建长乐-南澳大断裂带分布,侵位于沿海的绿片岩相和角闪岩相的变质岩中及内陆的中生代火山岩中,对其成因存在较多分歧.该岩体表现为与俯冲有关的岛弧地球化学特点,但在时间上又与古太平洋板块低角度歪斜俯冲、晚中生代的变质事件、平潭-东山变质带抬升和长乐-南澳剪切带运动在时间上基本一致.对于其成因不能简单的用拉张或碰撞加以解释,是受俯冲流体交代的上地幔,经部分熔融沿长乐-南澳断裂-应力转换带侵入.它与中国东南部出露的其它基性岩同源,但并未受到地壳的混染作用.计算结果表明,岱前山岩体经7%的部分熔融形成,其Sm、Nd含量高于原始地幔. |
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其他语种文摘
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The Daiqianshan mafic intrusion is situated along the Changle-Nanao fault zone in the Fujian coastal area. The rock body intruded the metamorphic rocks which are composed of biotite gneiss, amphibole schist, sillmanite schist and Mesozoic volcanic rocks. This paper shows that the rock body possesses subduction-related signatures with island-arc affinity. However, the age of the rock is close to the timing of low-angle oblique subduction of the ancient Pacific plate, high-pressure metamorphic event, uplift of the Kngtan-Dongshan metamorphic belt and movement along the Changle-Nanao shear zone. So the genesis of the rock shouldn't be interpreted merely as lithospheric extension or collision events, it might be derived from the upper mantle and intruded along the Changle-Nanao fault zone, and also had experienced metasomatism prior to intrusion. The rock body has the same source like other mafic rocks exposed in southeastern China, but the Daiqianshan intrusion has not experienced much crustal assimilation. One degree of partial melting is estimated at about 7.4%, and the Sm, Nd concentrations of the source rocks are slightly higher than those of the pre-mantle source. |
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来源
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矿物学报
,2004,24(3):245-252 【核心库】
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关键词
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岱前山
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俯冲
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拉张
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岩石圈地幔
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部分熔融
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地址
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中国科学院地球化学研究所, 贵州, 贵阳, 550002
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1000-4734 |
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学科
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地质学 |
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基金
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中国科学院知识创新工程项目
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国家自然科学基金国家杰出青年科学基金
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文献收藏号
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CSCD:1686421
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