| 辽东地区新太古代变质深成岩岩石化学特征及构造背景 |
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| 引用本文： | 赵丽君,吕晓瑜,王岐.辽东地区新太古代变质深成岩岩石化学特征及构造背景[J].地质与资源,2012,21(6):501-507. |
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| 作者姓名： | 赵丽君 吕晓瑜 王岐 |
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| 作者单位： | 辽宁省地质勘查院, 辽宁 大连 116110 |
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| 摘 要： | 辽东地区新太古代构成了华北陆块重要结晶基底.以辽吉古元古代裂谷为界，分为南北两个微陆块.北部微陆块由新太古代付家堡子片麻杂岩（U-Pb法2730 Ma）、虎庄片麻岩（U-Pb法2524.85 Ma）、连山关花岗岩（U-Pb法2563 Ma）组成，南部微陆块由得胜片麻杂岩（U-Pb法2519 Ma）组成.北部微陆块岩石地球化学显示钾玄岩系列-钠质钙碱系列，正铕异常-负铕异常轻稀土富集型特征.岩浆演化由钠质钙碱系列→钾质钙碱系列.源区性质为地壳深熔，相当于变质泥岩、变质杂砂岩部分熔融.构造背景为活动大陆边缘，由造山早期构造拉张环境上侵就位（付家堡子片麻杂岩）→造山主期（虎庄片麻岩）和造山晚期（连山关花岗岩）挤压环境同构造上侵就位.地壳演化由造山早期拉张→主造山挤压.南部微陆块岩石地球化学显示高铝、镁特征，与埃达克岩相近，稀土总量低，属负铕异常轻稀土富集型.岩浆具钠质演化趋势.源区性质具板片俯冲重熔特征，相当基性岩部分融熔，为板片俯冲构造背景.南部微陆块埃达克岩存在，暗示2500 Ma年前后，南部微陆块向北俯冲，形成辽东地区太古宙统一大陆.
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| 关 键 词： | 新太古代 变质深成岩 岩石地球化学 岩浆源区 构造背景 辽东地区 |
| 收稿时间： | 2011-12-22 |
LITHOCHEMISTRY AND TECTONIC SETTING OF THE NEOARCHEAN METAMORPHIC PLUTONIC ROCKS IN EASTERN LIAONING REGION |
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| ZHAO Li-jun
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LV Xiao-yu
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WANG Qi.LITHOCHEMISTRY AND TECTONIC SETTING OF THE NEOARCHEAN METAMORPHIC PLUTONIC ROCKS IN EASTERN LIAONING REGION[J].Geology and Resources,2012,21(6):501-507. |
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| Authors: | ZHAO Li-jun LV Xiao-yu WANG Qi |
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| Institution: | Liaoning Institute of Geological Survey, Dalian 116110, Liaoning Province, China |
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| Abstract: | The Neoarchean rocks in Eastern Liaoning form the basement of North China landmass,which is divided by the Paleoproterozoic Liaoning-Jilin rift into two micro-landmasses in north and south.The northern micro-landmass is composed of Fujiapuzi gneiss complex(U-Pb 2730 Ma), Huzhuang gneiss(U-Pb 2524.85 Ma)and Lianshanguan granite(U-Pb 2563 Ma). The southern micro-landmass consists of Desheng gneiss complex(U-Pb 2591 Ma). The northern microlandmass geochemically presents the characteristics of shoshonite series-sodic calc-alkaline series,belonging to LREE enriched type with positive to negative Eu anomalies.The magma evolved from sodic calc-alkaline to potassic calc-alkaline series.The tectonic setting is active continental margin,with crustal evolution from extension in early orogenic period to compression in major orogenic period.The geochemistry of the rocks in the southern micro-landmass is characterized by high Al and Mg,which is similar to that of adakite,with low total REE,belonging to LREE enriched type with negative Eu anomaly.The magmatic evolution shows sodic trend.The existence of adakite in the southern micro-landmass suggests that the southern micro-landmass subducted northward around 2500 Ma,forming the united Archean continent in Eastern Liaoning region. |
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| Keywords: | Neoarchean metamorphic plutonic rock lithogeochemistry magmatic source tectonic setting Eastern Liaoning |
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