| 宁芜盆地钟姑矿田典型铁矿成矿岩体Hf-O同位素特征及地质意义 |
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| 引用本文： | 孙维安,袁峰,邓宇峰,刘光贤,杨迪,李现锁,傅斌.宁芜盆地钟姑矿田典型铁矿成矿岩体Hf-O同位素特征及地质意义[J].岩石学报,2017,33(11):3559-3580. |
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| 作者姓名： | 孙维安 袁峰 邓宇峰 刘光贤 杨迪 李现锁 傅斌 |
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| 作者单位： | 合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学矿床成因与勘查技术研究中心, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学矿床成因与勘查技术研究中心, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学矿床成因与勘查技术研究中心, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学矿床成因与勘查技术研究中心, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学矿床成因与勘查技术研究中心, 合肥 230009,合肥工业大学资源与环境工程学院, 合肥 230009;合肥工业大学矿床成因与勘查技术研究中心, 合肥 230009,澳大利亚国立大学地球科学研究中心, 堪培拉 0200 |
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| 基金项目： | 本文受国家重点研发计划项目（2016YFC0600206、2016YFC0600209）、国家自然科学基金重点国际合作研究项目（41320104003）和面上项目（41672069）联合资助. |
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| 摘 要： | 钟姑矿田位于宁芜盆地南部,受矿田内格状构造控制产出一系列早白垩世(129~132Ma)闪长岩及二长岩类侵入体,与铁矿床的形成密切相关,而区域内成矿岩体的研究尤其是岩浆岩的起源和演化有待进一步探讨。本次工作以矿田内的姑山辉石闪长玢岩、龙山辉石闪长岩、白象山闪长岩、钟九闪长岩和太平山二长岩等与铁成矿有关的岩体为研究对象,开展LA-ICP-MS原位锆石Hf同位素和SHRIMP原位O同位素研究。结果显示,钟姑矿田各成矿岩体具有较一致的锆石Hf-O同位素组成,~(176)Hf/~(177)Hf值为0.282425~0.282695,εHf(t)值为-12.3~-3.9,tDM2范围在1.26~1.86Ga;锆石δ18O集中于3.34‰~8.05‰,捕获锆石的176Hf/177Hf比值为0.282324~0.282487,εHf(t)=-15.8~-10.1,锆石tDM2年龄在1.72~20.8Ga之间,锆石δ~(18)O相对集中于5.90‰~6.51‰。钟姑矿田岩浆岩起源于富集的岩石圈地幔,同位素特征指示其携带板块俯冲和蚀变洋壳信息,钟姑矿田的成岩成矿作用应与伸展背景下古太平洋板块俯冲有关。与长江中下游其他矿集区岩浆岩对比研究表明,包括宁芜在内的长江中下游地区岩浆岩具有相同的地幔源区,以铁矿床为主的宁芜和庐枞盆地岩浆岩源区成分以交代岩石圈地幔为主,而以铜陵、繁昌为代表的铜多金属成矿区的岩浆岩受长江中下游新元古代基底的更多影响。
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| 关 键 词： | 锆石Hf-O同位素 钟姑矿田 宁芜盆地 地球化学 铁矿床 |
| 收稿时间： | 2017/4/25 0:00:00 |
| 修稿时间： | 2017/9/29 0:00:00 |
Hf-O isotope characteristics for ore-related intrusions of typical iron deposits in Zhonggu ore field, Ningwu basin |
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| SUN WeiAn,YUAN Feng,DENG YuFeng,LIU GuangXiang,YANG Di,LI XianSuo and FU Bin.Hf-O isotope characteristics for ore-related intrusions of typical iron deposits in Zhonggu ore field, Ningwu basin[J].Acta Petrologica Sinica,2017,33(11):3559-3580. |
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| Authors: | SUN WeiAn YUAN Feng DENG YuFeng LIU GuangXiang YANG Di LI XianSuo and FU Bin |
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| Institution: | School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China,School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China;Ore Deposit and Exploration Centre, Hefei University of Technology, Hefei 230009, China and Research School of Earth Sciences, The Australian National University, Canberra 0200, Australian |
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| Abstract: | |
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| Keywords: | Hf-O isotope Zhonggu ore field Ningwu Basin Geochemistry Iron deposit |
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