内蒙古双尖子山银多金属矿床花岗斑岩年代学、地球化学特征及构造意义

本文对内蒙古双尖子山银多金属矿床花岗斑岩进行了锆石SHRIMP U-Pb定年,并对花岗斑岩的主量元素、微量元素组成进行了分析研究。结果显示,双尖子山花岗斑岩加权平均年龄为（133.4±1.2）Ma,为大兴安岭南段早白垩世岩浆活动集中期产物;花岗斑岩SiO2含量为68.81%-70.05%,低MgO、TiO2,K2O/Na2O为0.97-1.27,较为富钾;A/CNK在0.94-1.12之间,属准铝-弱过铝系列;富集Rb、Th、U、K等大离子亲石元素（LILE）,亏损Sr、P、Ti等高场强元素（HFSE）;稀土总量ΣREE中等,δEu为0.55-0.62,Eu中等负异常。本文认为双尖子山银多金属...

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Bibliographic Details
Published in地质与勘探 Vol. 53; no. 3; pp. 495 - 507
Main Author 顾玉超 陈仁义 贾斌 鞠楠
Format Journal Article
LanguageChinese
Published 中国地质调查局沈阳地质调查中心,辽宁沈阳 110034%中国地质调查局油气资源调查中心,北京,100029%中国地质调查局沈阳地质调查中心,辽宁沈阳,110034 2017
中国地质大学(北京)地球科学与资源学院,北京 100083
Subjects
SHRIMPU-Pb定年
内蒙古
双尖子山
构造背景
花岗斑岩
锆石
SHRIMP U-Pb dating
内蒙古
SHRIMP U-Pb定年
zircon
构造背景
Inner Mongolia
双尖子山
Shuangjianzishan
tectonic setting
花岗斑岩
锆石
granite porphyry
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ISSN0495-5331

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Summary:本文对内蒙古双尖子山银多金属矿床花岗斑岩进行了锆石SHRIMP U-Pb定年,并对花岗斑岩的主量元素、微量元素组成进行了分析研究。结果显示,双尖子山花岗斑岩加权平均年龄为（133.4±1.2）Ma,为大兴安岭南段早白垩世岩浆活动集中期产物;花岗斑岩SiO2含量为68.81%-70.05%,低MgO、TiO2,K2O/Na2O为0.97-1.27,较为富钾;A/CNK在0.94-1.12之间,属准铝-弱过铝系列;富集Rb、Th、U、K等大离子亲石元素（LILE）,亏损Sr、P、Ti等高场强元素（HFSE）;稀土总量ΣREE中等,δEu为0.55-0.62,Eu中等负异常。本文认为双尖子山银多金属矿床为多期次叠加的岩浆热液型矿床,160Ma和133Ma可能分别是岩浆活动的两个高峰期。花岗斑岩形成于陆内晚造山期-造山期后的伸展环境,蒙古-鄂霍次克洋俯冲板片在深部断离,引发软流圈物质上涌,这是导致大兴安岭南段早白垩世岩石圈伸展环境的主要机制。
Bibliography:11-2043/P
zircon, SHRIMP U -Pb dating, tectonic setting, granite porphyry, Shuangjianzishan, Inner Mongolia
This paper presents a series of studies on the granite porphyry from the Shuangjiauzishan silver polymetallic deposit, including dating of zir- con SHRIMP U - Pb, and analysis of major elements and trace elements. The results show that the granite porphyry, a product of active magmatic activity in the southern Dahinggan Mountains during the early Cretaceous, has an age of （ 133.4 _ 1.2） Ma on average. It contains 68.81% - 70.05% of SiO2 , and small amounts of MgO and TiO2. The K2O/Na2O value is between 0.97 to 1.27, indicating a feature of slight potassium - rich. The A/CNK is be- tween 0.94 and 1.12, which belongs to metaluminous -weak peraluminous series. The lithophylic elements （LILE） such as Rb, Th, U and K are rich, while HFSE such as Sr, P, and Ti are deficit. The total amount of race earth content EREE is normal. ~Eu is between 0.55 to 0.62. Eu is medium nega- tive anomalous. We conclude that the
ISSN:0495-5331