| 阿尔金山北缘喀腊大湾地区早古生代中酸性侵入岩岩石地球化学特征及构造意义 |
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| 引用本文： | 刘牧,陈柏林,李松彬.阿尔金山北缘喀腊大湾地区早古生代中酸性侵入岩岩石地球化学特征及构造意义[J].地质与资源,2014,23(4):369-375. |
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| 作者姓名： | 刘牧 陈柏林 李松彬 |
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| 作者单位： | 1. 俄克拉荷马大学 地球与能源学院, 美国 俄克拉荷马州 73072;2. 中国地质科学院地质力学研究所, 北京 100081 |
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| 基金项目： | “十二五”国家科技支撑计划项目新疆跨境成矿带战略性矿产资源预测与靶区评价专题“阿尔金成矿带多元信息成矿预测与找矿示范”(编号2011BAB06B08-04);中国地质调查局地质矿产调查专项“阿尔金喀腊大湾地区铁多金属矿构造控矿研究与找矿预测”(编号1212011085043)联合资助 |
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| 摘 要： | 喀腊大湾地区位于阿尔金山脉东北缘,当地早古生代时期构造环境复杂并且伴随剧烈的花岗质岩浆活动.通过对区域内早古生代中酸性侵入岩5个岩体(大平沟岩体、阿北银铅矿岩体、阿北岩体、4337北花岗岩体、喀腊大湾南岩体)的岩石学、岩相学、地球化学特征研究,探讨早古生代区域重大构造事件和构造环境.南部的喀腊大湾南岩体表现低钾性质,其余4个岩体样本为中高钾钙碱性中酸性岩,并且有向高钾演变的趋势,铝饱和指数在1.0~1.1之间,数据统计和分析大部分样品具有I型花岗岩特征,少部分显示了I型向S型过渡的性质,代表了洋壳-陆壳活动性大陆边缘的环境.结合喀腊大湾周边地质背景,本地区应该是阿尔金古洋壳和塔里木地块南北向碰撞作用的火山岛弧区域.
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| 关 键 词： | 阿尔金山 早古生代 花岗岩 地球化学 构造环境 |
| 收稿时间： | 2013-09-02 |
GEOCHEMISTRY AND TECTONIC IMPLICATION OF THE EARLY PALEOZOIC INTRUSIVE ROCKS IN THE KALADAWAN AREA,NORTHERN ALTUN MOUNTAINS |
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| LIU Mu
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CHEN Bai-lin
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LI Song-bin.GEOCHEMISTRY AND TECTONIC IMPLICATION OF THE EARLY PALEOZOIC INTRUSIVE ROCKS IN THE KALADAWAN AREA,NORTHERN ALTUN MOUNTAINS[J].Geology and Resources,2014,23(4):369-375. |
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| Authors: | LIU Mu CHEN Bai-lin LI Song-bin |
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| Institution: | 1. ConocoPhilips School of Earth and Energy, University of Oklahoma, Norman, OK 73072, USA;2. Institute of Geomechanics, CAGS, Beijing 100081, China |
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| Abstract: | The Kaladawan area is located in the northeast of Altun Mountains,where the Early Paleozoic tectonic settingswere complicated,accompanied by intense granitic magmatism.Based on the research of petrology,geochemistry and geochronology of the Early Paleozoic acid-intermediate intrusive rocks in this area,the regional geological events and tectonic settings are discussed.Four of the five plutons in this study are characterized by high-K calc-alkaline.The other presents low-K character.Most of the samples analyzed show the characteristics of Ⅰ-type granite,with a few as transitional products from Ⅰ-type to S-type,indicating the active continental margin environment of oceanic-continental crust.Regards Combining the surrounding geological background,this region should be the volcanic island arc when the ancient Altun oceanic crust collided with Tarim massif. |
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| Keywords: | Altun Mountains Early Paleozoic era granite geochemistry tectonic setting |
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