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| 福建紫金山矿田罗卜岭铜钼矿化斑岩锆石LA-ICP- MS U-Pb年龄及成矿岩浆高氧化特征研究 | |
| 引用本文： | 黄文婷,李晶,梁华英,王春龙,林书平,王秀璋.福建紫金山矿田罗卜岭铜钼矿化斑岩锆石LA-ICP- MS U-Pb年龄及成矿岩浆高氧化特征研究[J].岩石学报,2013,29(1):283-293. |
| 作者姓名： | 黄文婷 李晶 梁华英 王春龙 林书平 王秀璋 |
| 作者单位： | 1. 中国科学院广州地球化学研究所,中国科学院矿物学与成矿学重点实验室,广州510640;中国科学院大学,北京 100049 2. 中国科学院广州地球化学研究所,中国科学院矿物学与成矿学重点实验室,广州510640;紫金矿业集团股份有限公司,上杭364200 3. 中国科学院广州地球化学研究所,中国科学院矿物学与成矿学重点实验室,广州510640 |
| 基金项目： | 本文受中国科学院重大项目(KZCX1-YW-15-3);中国科学院重点国际合作项目(GJHZ1127);国家自然科学基金项目(41172080、41121002、41272099)和国土资源部深部矿产资源立体探测技术及实验研究项目(SinoProbe-03-01)联合资助. |
| 摘 要： | 罗卜岭斑岩铜钼矿床是紫金山Cu-Au-Mo浅成低温-斑岩矿田内新近发现的大型斑岩铜钼矿床,本文在岩芯及光薄片系统观察的基础上,分析了矿化斑岩锆石LA-ICP-MS U-Pb年龄及锆石Ce4/Ce3+比值.罗卜岭赋矿斑岩体可分为两期,早期为角闪黑云母花岗闪长斑岩及黑云母花岗闪长斑岩,晚期为黑云母花岗闪长斑岩.早期角闪黑云母花岗闪长斑岩和黑云母花岗闪长斑岩锆石LA-ICP-MS U-Pb年龄分别为103.7±1.2Ma,MSWD=0.33和103.0±0.9Ma,MSWD=1.00;晚期黑云母花岗闪长斑岩锆石LA-ICP-MS U-Pb年龄为97.6±2.1Ma,MSWD=6.00.罗卜岭成矿斑岩基质普遍发育硬石膏,两期成矿斑岩锆石都具较高的Ce4 +/Ce3平均值,在630 ～770之间,高于区内非成矿花岗岩锆石的Ce4+/Ce3+平均值(182 ～577),显示罗卜岭斑岩矿床成矿岩浆具有高氧逸度的特征.据罗卜岭斑岩矿床的形成时代、高氧逸度岩浆特征,结合华南地区中生代构造背景,我们初步认为罗卜岭斑岩矿床的形成可能和中生代古太平洋向北西西方向俯冲有关. |
| 关 键 词： | 斑岩铜钼矿床 锆石U-Pb年龄 花岗闪长斑岩 紫金山 |
| 收稿时间： | 4/5/2012 12:00:00 AM |
| 修稿时间： | 2012/11/25 0:00:00 |
Zircon LA-ICP-MS U-Pb ages and highly oxidized features of magma associated with Luoboling porphyry Cu-Mo deposit in Zijinshan ore field, Fujian Province |
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| HUANG WenTing,LI Jing,LIANG HuaYing,WANG ChunLong,LIN ShuPing and WANG XiuZhang.Zircon LA-ICP-MS U-Pb ages and highly oxidized features of magma associated with Luoboling porphyry Cu-Mo deposit in Zijinshan ore field, Fujian Province[J].Acta Petrologica Sinica,2013,29(1):283-293. | |
| Authors: | HUANG WenTing LI Jing LIANG HuaYing WANG ChunLong LIN ShuPing and WANG XiuZhang |
| Institution: | Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;Zijin Mining Group Co., Ltd, Shanghang 364200, China;Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China;University of Chinese Academy of Sciences, Beijing 100049, China;Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China |
| Abstract: | The Luoboling large porphyry Cu-Mo deposit is a recently discovered deposit in the Zijinshan Cu-Au-Mo ore field. Based on the relationship of the porphyries and the systematically petrographic study, the ore-bearing porphyries can be divided into early stage hornblende biotite granodiorite porphyry and biotite granodiorite porphyry and late stage biotite granodiorite porphyry. The early stage hornblende biotite granodiorite porphyry and biotite granodiorite porphyry has zircon LA-ICP-MS U-Pb age of 103.7±1.2Ma, with MSWD=0.33 and of 103.0±0.9Ma with MSWD=1.00, respectively, and the late stage biotite granodiorite porphyry has zircon LA-ICP-MS U-Pb age of 97.6±2.1Ma with MSWD=6.00. Zircon grains from two stage ore bearing porphyries have much higher average Ce4+/Ce3+ ratios (630~770) than those (182~577) of barren granites in the ore field. Based on the zircon high Ce4+/Ce3+ ratios and the wide occurrence of anhydrite in the ore-bearing porphyries, it is concluded that the ore-bearing magma was characterized by a relatively high oxygen fugacity. According to emplaced age and high oxygen fugacity of ore forming magma, and tectonic setting of the South China in the Mesozoic, the Luoboling ore-bearing porphyries are regarded to be triggered by the westward subduction of paleo-Pacific plate during Mesozoic. |
| Keywords: | Porphyry Cu-Mo deposit Mineralization age Granodiorite porphyry Zijinshan |
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