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    广西昆仑关A型花岗岩地球化学特征及构造意义

    谭俊 魏俊浩 李水如 王忠铭 付乐兵 张可清

    谭俊, 魏俊浩, 李水如, 王忠铭, 付乐兵, 张可清, 2008. 广西昆仑关A型花岗岩地球化学特征及构造意义. 地球科学, 33(6): 743-754.
    引用本文: 谭俊, 魏俊浩, 李水如, 王忠铭, 付乐兵, 张可清, 2008. 广西昆仑关A型花岗岩地球化学特征及构造意义. 地球科学, 33(6): 743-754.
    TAN Jun, WEI Jun-hao, LI Shui-ru, WANG Zhong-ming, FU Le-bing, ZHANG Ke-qing, 2008. Geochemical Characteristics and Tectonic Significance of Kunlunguan A-Type Granite, Guangxi. Earth Science, 33(6): 743-754.
    Citation: TAN Jun, WEI Jun-hao, LI Shui-ru, WANG Zhong-ming, FU Le-bing, ZHANG Ke-qing, 2008. Geochemical Characteristics and Tectonic Significance of Kunlunguan A-Type Granite, Guangxi. Earth Science, 33(6): 743-754.

    广西昆仑关A型花岗岩地球化学特征及构造意义

    基金项目: 

    教育部博士点基金项目 20040491502

    全国危机矿山接替资源找矿项目 2006020035

    详细信息
      作者简介:

      谭俊(1982-),男,博士研究生,主要从事地球化学及矿产普查与勘探研究工作.E-mail:tanjunallan@163.com

    • 中图分类号: P588.12

    Geochemical Characteristics and Tectonic Significance of Kunlunguan A-Type Granite, Guangxi

    • 摘要: 昆仑关岩体位于广西南丹-昆仑关燕山期花岗岩带西南端, 岩石类型为黑云母花岗岩.岩相学及化学成分显示其属高钾钙碱性岩系, 具高硅、富碱和铝、低磷和钛的特点, SiO2含量为68.13~72.61, K2O/Na2O比值介于1.28~1.69之间, 铝指数A/CNK=0.72~1.28, 属准铝质一强过铝质岩石.富集Ga、Rb、Th、U、Pb等元素, 而强烈亏损13a、Nb、Sr、P和Ti.稀土元素具明显负Eu异常, 总体呈现轻稀土富集的右倾"V"形配分模式.昆仑关古民单元锆石LA-ICP-MSU-Pb定年结果为93±1Ma, 形成于晚白垩世.矿物组成及地球化学特征确定了南丹-昆仑关花岗岩带是华南西南端一条重要的铝质A型花岗岩带, 控岩断裂构造为NW向南丹一昆仑关深大断裂.岩石学及主量和微量元素(含稀土)特征表明岩体侵位于后碰撞阶段的张性构造环境.结合研究范围在晚白垩世的构造背景及区域应力场匹配组合关系, 认为其与印度板块在该时期北移所引起的古太平洋板块高角度俯冲所导致的弧后拉张有关, 与浙闽沿海A型花岗岩或碱性岩分别代表了匹配构造体制下的两条A型花岗岩带.

       

    • 图  1  西南丹一昆仑关地区大地构造位置图(a)、广西构造略图(b)及昆仑关岩体地质图(c)

      底图分别据王强等(2005)、广西壮族自治区区域地质测量队(1972)以及广西有色金属地质研究所(1993)改编.也图中断裂编号依次为:①政和--大埔断裂;②福安一南靖断裂;③长乐--南澳断裂;④南丹--昆仑关断裂.b.图中斜矩形示南丹--昆仑关铝质A型花岗岩带.a奥陶系及白垩系地层位于图幅外.1.第四系;2.第三系;3.三叠系;4.二叠系;5.石炭系;6.泥盆系;7.寒武系;8.晚白垩世A型花岗岩或碱性岩;9. 晚白垩世断陷盆地

      Fig.  1.  Sketch maps showing tectonic location of Nandan-Kunlunguan belt, Guangxi(a), simplified tectonic of Guangxi(b), and geological character of Kunlunguan intrusion(c)

      图  2  仑关岩体的全碱--SiO2(即TAS)岩石分类图解(a)和K2O-SiO2图解(b)

      碱性与亚碱性系列划分曲线据Irvine and Baragar(1971);岩系划分据Peccerillo and Taylor(1976);南丹地区大厂(6个样品)和芒场(2个样品)矿田同时代黑云母花岗岩阴影投影范围据蔡明海等(2004)确定

      Fig.  2.  TAS classification(a) and K2O-SiO2 diagram(b)of Kunlunguan intrusion

      图  3  仑关岩体原始地幔标准化微量元素蛛网图(a)及球粒陨石标准化稀土配分曲线(b)

      原始地幔和球粒陨石标准据Sun and McDonough(1989);浙闽沿海晚白垩世铝质A型花岗岩椐邱检生等(1999, 2000),共11个样品点;图例同图 2。下同

      Fig.  3.  Pnmitive mantle normalized trace element distributions(a) and chondfite normalized REE patterns(b)

      图  4  仑关岩体A型花岗岩判别图解

      S、I、M与A型花岗岩划分据Whalen et al.(1987);南丹地区大厂(4个样品)和芒场(4个样品)矿田花岗岩数据据蔡明海等(2004)

      Fig.  4.  A-type granite discrimination diagram of Kunlunguan intrusion

      图  5  古民黑云母花岗岩(NY-3-10)中锆石形态阴极发光(CL)图像

      圆圈及圈中(外)数字分别表示分析点位和测点编号,圈外年龄示206Pb/238U表面年龄

      Fig.  5.  Cathodo luminescena images showing typical zircon morphology of Gumin biotite granite (NY-3-10)

      图  6  民黑云母花岗岩(NY-3-10)锆石LA-ICP-MS U-Pb年龄谐和图

      加权平均年龄为去掉7.9、14和16号测点(图中阴影分析点)外12粒岩浆锆石的加权结果

      Fig.  6.  Coneordia plots for zircons from Gumin biotite granite

      图  7  昆仑关岩体的Rb/30-Hf-3Ta判别图解

      Fig.  7.  Rb/30-Hf-3Ta discrimination plot of Kunlunguan intrusion

      图  8  仑关岩体的R1-104Ga/Al(a)和Nb-Y-Ce(b)图解

      Fig.  8.  R1-104Ga/AI(a) and Nb-Y-Ce(b)diagrams of Kunlunguan intrusion

      表  1  仑关岩体主量元素(%)和微量元素(10-6)分析结果

      Table  1.   Major and trace element compositions of Kunlunguan intrusion

      表  2  昆仑关岩体古民单元(NY-3-10)LA-ICP-MS错石UPb分析结果

      Table  2.   LA-ICP-MS zircon U-Pb dating data for Gumin unit(NY-3-10), Kunlunguan intrusion

      表  3  昆仑关岩体古民单元(NY-3-10)错石稀土元素分析结果

      Table  3.   Zircon trace element compositions for Gumin unit(NY-3-10), Kunlunguan intrusion

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    • 收稿日期:  2008-04-25
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