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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
Zircon U-Pb age and petrogenesis of the Lüshigou high Ba-Sr quartz-monzonite in East Junggar, Xinjiang, and its geological significance
投稿时间:2013-10-08  修订日期:2017-07-26
中文关键词: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
基金项目:中国地质调查局资助项目(12120113096500,12120113094000,1212010811933)
作者单位E-mail
赵建新 中国地质科学院 地质研究所, 北京 100037;江西省地质矿产勘查开发局912地质队, 江西 鹰潭 335001  
童英 中国地质科学院 地质研究所, 北京 100037 yingtong@cags.ac.cn 
孟贵祥 中国地质科学院 矿产资源研究所, 北京 100037  
王涛 中国地质科学院 地质研究所, 北京 100037  
张招崇 中国地质大学(北京), 北京 100083  
张建军 中国地质科学院 地质研究所, 北京 100037  
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中文摘要:
      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±1 Ma,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(SiO2=62.31%~65.31%,CaO=3.71%~4.89%,K2O=2.85%~3.54%),属高钾钙碱性系列。铝含量较高(Al2O3=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(∑REE=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 (758×10-6~1 113×10-6)、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。
英文摘要:
      The Lüshigou pluton is located in the Qiongheba ore concentration area in East Junggar. This pluton intruded into the host rock of the Lüshigou 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 SiO2 (62.31%~65.31%), Al2O3 (15.44%~16.29%), CaO (3.71%~4.89%) and K2O (2.85%~3.54%) contents, exhibiting high-K calc-alkaline 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 (758×10-6~1 113×10-6), 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 Lüshigou 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.
赵建新,童英,孟贵祥,王涛,张招崇,张建军,2017,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[J].岩石矿物学杂志,36(5):743~754.
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