| 桐柏北部黄岗侵入杂岩岛弧构造环境的厘定 |
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| 引用本文： | 张利,周炼,王林森,凌文黎.桐柏北部黄岗侵入杂岩岛弧构造环境的厘定[J].矿物岩石地球化学通报,2001,20(4):245-247. |
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| 作者姓名： | 张利 周炼 王林森 凌文黎 |
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| 作者单位： | 中国地质大学地球科学学院,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金 ( 4 0 0 730 0 5 )，国家重点基础研究发展规划项目 (G19990 75 5 0 6 )资助 |
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| 摘 要： | 出露于北秦岭桐柏北部的黄岗侵入杂岩形成于早古生代 ,有超基性、基性和中酸性岩石产出 ,以中酸性岩石为主。主量元素和微量元素地球化学特征显示 ,黄岗侵入杂岩是同源岩浆分异结晶的产物 ,同位素示踪反映岩浆中含有一定比例的陆壳物质。分析表明 ,黄岗侵入杂岩形成于类似大洋板块俯冲的岛弧构造环境 ,与二郎坪弧后盆地向北的俯冲消减有密切联系 ,其中的陆壳物质来自俯冲板上陆壳沉积物的再循环。
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| 关 键 词： | 岛弧构造环境 陆壳物质再循环 黄岗侵入杂岩 地球化学 |
| 文章编号： | 1007-2802(2001)04-0245-03 |
| 修稿时间： | 2001年6月26日 |
Huanggang Intrusive Complex in Northern Tongbai Area: Island-arc Tectonic Environment |
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| ZHANG Li,ZHOU Lian,WANG Lin-sen, LING Wen-li.Huanggang Intrusive Complex in Northern Tongbai Area: Island-arc Tectonic Environment[J].Bulletin of Mineralogy Petrology and Geochemistry,2001,20(4):245-247. |
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| Authors: | ZHANG Li ZHOU Lian WANG Lin-sen LING Wen-li |
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| Abstract: | The Huanggang intrusive complex mainly consists of ultra-basic, basic, intermediate and acid rocks, dominated by intermediate and basic rocks. Geochemical characteristics suggested that the complex was derived from the fractional crystallization of co-source magma. Isotope analysis showed the magma was mixed with large amount of crustal substance. The complex was formed in island-arc tectonic environment and similar to the one formed in the setting of ocean plate subduction and was closely related to the northward subduction of the Erlangping back-arc basin. The mixed crustal substance is the product of the recycling of crustal sediments on the subducted slab. |
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| Keywords: | arc-back environment recycling of crustal substance Huanggang intrusive complex geochemisty |
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