柴达木地块北缘南北沟岩体地球化学特征及成矿前景

南北沟岩体位于柴达木地块北缘,出露面积4.5km2。岩石主要类型有淡色辉长岩、辉长岩、暗色辉长岩,各岩石类型之间多为过渡关系,局部呈侵入接触。主量元素化学组成属拉斑玄武岩系列。岩石相对富集大离子亲石元素,亏损高场强元素,明显亏损Nb、Ta。岩体原生岩浆属于高镁拉斑玄武岩（MgO质量分数为11.1%）,在岩浆演化过程中遭受了一定程度中—上地壳物质的同化混染作用。岩体形成于古岛弧环境,是早古生代柴达木地块向祁连地块俯冲过程的产物。从岩浆分异程度、原生岩浆性质、同化混染等方面综合评价认为,南北沟岩体具有较好的铜镍硫化物矿床成矿潜力。...

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Published in地球科学与环境学报 Vol. 37; no. 1; pp. 12 - 23
Main Author 姜常义 王子玺 杜玮 王梦玺
Format Journal Article
LanguageChinese
Published 长安大学地球科学与资源学院，陕西西安 710054 2015
长安大学西部矿产资源与地质工程教育部重点实验室，陕西西安 710054%长安大学地球科学与资源学院,陕西西安,710054
Subjects
原生岩浆
地壳混染
地球化学
成矿潜力
构造环境
柴达木地块
铜镍硫化物矿床
crustal contamination
地壳混染
ore-forming
地球化学
geochemistry
primary magma
铜镍硫化物矿床
构造环境
structural environment
成矿潜力
柴达木地块
Cu-Ni sulfide deposit
原生岩浆
Qaidam massif
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ISSN1672-6561

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Summary:南北沟岩体位于柴达木地块北缘,出露面积4.5km2。岩石主要类型有淡色辉长岩、辉长岩、暗色辉长岩,各岩石类型之间多为过渡关系,局部呈侵入接触。主量元素化学组成属拉斑玄武岩系列。岩石相对富集大离子亲石元素,亏损高场强元素,明显亏损Nb、Ta。岩体原生岩浆属于高镁拉斑玄武岩（MgO质量分数为11.1%）,在岩浆演化过程中遭受了一定程度中—上地壳物质的同化混染作用。岩体形成于古岛弧环境,是早古生代柴达木地块向祁连地块俯冲过程的产物。从岩浆分异程度、原生岩浆性质、同化混染等方面综合评价认为,南北沟岩体具有较好的铜镍硫化物矿床成矿潜力。
Bibliography:JIANG Chang-yi , WANG Zi-xi , DU Wei , WANG Meng-xi （1. School of Earth Science and Resources, Chang＇an University, Xi＇an 710054, Shaanxi, China; 2. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang＇an University, Xi＇an 710054, Shaanxi, China）
61-1423/P
Nanbeigou intrusion is located in the northern margin of Qaidam massif,and the outcrop area is 4.5km2.The intrusion is emplaced into amphibole plagiogneiss from Paleoproterozoic Dakendaban Group and amphibolite from Mesoproterozoic.It consists of pale gabbro,gabbro,melagabbro.They extend mainly gradual transition,and part shows intrusive contact.Rock alteration is strong,most of pyroxenes alter to amphibole,and part shows biotitization and chloritization;plagioclase shows saussuritization at different levels.Chemical composition of major element belongs to tholeiitic series.The rocks relatively enrich in large ion lithophile element（LILE）,deplete in high field strength element（HFSE）,and obviously deplete in Nb
ISSN:1672-6561