新疆东准噶尔绿石沟高Ba-Sr石英二长岩的锆石U-Pb年龄、成因及地质意义
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  • 英文篇名:Zircon U-Pb age and petrogenesis of the Lushigou high Ba-Sr quartz-monzonite in East Junggar,Xinjiang,and its geological significance
  • 作者:赵建新 ; 童英 ; 孟贵祥 ; 王涛 ; 张招崇 ; 张建军
  • 英文作者:ZHAO Jian-xin;TONG Ying;MENG Gui-xiang;WANG Tao;ZHANG Zhao-chong;ZHANG Jian-jun;Institute of Geology,Chinese Academy of Geological Sciences;No.912 Geological Surveying Party,Jiangxi Bureau of Geology and Mineral Exploration and Development;Institute of Mineral Resources,Chinese Academy of Geological Sciences;China University of Geosciences;
  • 关键词:东准噶尔 ; 琼河坝 ; 铜矿 ; 高Ba-Sr ; 石炭纪
  • 英文关键词:East Junggar;;Qiongheba;;copper deposit;;high Ba-Sr;;Carboniferous
  • 中文刊名:YSKW
  • 英文刊名:Acta Petrologica Et Mineralogica
  • 机构:中国地质科学院地质研究所;江西省地质矿产勘查开发局912地质队;中国地质科学院矿产资源研究所;中国地质大学(北京);
  • 出版日期:2017-09-25
  • 出版单位:岩石矿物学杂志
  • 年:2017
  • 期:v.36;No.169
  • 基金:中国地质调查局资助项目(12120113096500,12120113094000,1212010811933)~~
  • 语种:中文;
  • 页:YSKW201705015
  • 页数:12
  • CN:05
  • ISSN:11-1966/P
  • 分类号:154-165
摘要
绿石沟岩体位于东准噶尔琼河坝矿集区,向东侵入到绿石沟铜矿赋矿围岩中泥盆统北塔山组火山岩中。LA-ICP-MS锆石U-Pb测年显示该岩体形成于354±1Ma,为早石炭世。其主要岩石类型为石英二长岩,含有大量的基性微粒包体,具有较高的硅、钙、钾含量(SiO_2=62.31%~65.31%,CaO=3.71%~4.89%,K_2O=2.85%~3.54%),属高钾钙碱性系列。铝含量较高(Al_2O_3=15.44%~16.29%),属准铝质(A/CNK=0.93~0.99,A/NK=1.68~1.96)Ⅰ型花岗岩。稀土元素总量较低(ΣREE=90.82×10~(-6)~111.36×10~(-6)),轻稀土元素相对富集,Eu呈弱的负异常(δEu=0.68~0.87)。富集大离子亲石元素(K、Rb、Ba、Sr等),亏损高场强元素(Nb、Ta、P、Ti等),具有高Ba(758×10~(-6)~1113×10~(-6))、Sr(401.8×10~(-6)~512.5×10~(-6))含量和高的(La/Yb)_N、Sr/Y值,显示出高Ba-Sr花岗岩的特征,应是幔源基性岩浆与壳源岩浆混合的产物,可能形成于俯冲环境向造山后环境的构造转换阶段。
        The Liishigou pluton is located in the Qiongheba ore concentration area in East Junggar. This pluton intruded into the host rock of the Lushigou copper deposit. LA-ICP-MS U-Pb dating of zircons from this pluton yielded an early Carboniferous age of 354 ± 1 Ma. The main rock type of the pluton is quartz-monzonite with many mafic-ultral mafic enclaves inside. These quartz-monzonites have high SiO_2(62.31%~65.31%), Al_2O_3(15.44%~16.29%),CaO(3.71%~4.89%) and K_2O(2.85%~3.54%) contents,exhibiting high-K calcalkaline and metaluminous characteristics(A/CNK=0.93~0.99,A/NK=1.68~1.96),and belonging to I-type granite. The total REE values of them are low(90.82×10~(-6)~111.36×10~(-6)) with relative enrichment of LREE and Eu negative anomaly(δEu=0.68~0.87). The primitive mantle normalized trace element patterns are characterized by the enrichment of the LILE(K, Rb, Ba, Sr) and depletion of the HFSE(Nb, Ta, P, Ti). The quartz-monzonite has high Ba(758×10~(-6)~1113×10~(-6)),Sr(401.8×10~(-6)~512.5×10~(-6)) values with high(La/Yb)_N, Sr/Y ratios, distinct Nb, Ta and Ti depletion, and are comprehensively called high Ba-Sr granitoid.These characters indicate that the Liishigou pluton was probably formed by the magma-mixing of the mantle-derived mafic magma and crustal partial melting magma during the tectonic transition period from subduction to post-orogenic setting in the late Paleozoic.
引文
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