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地质科学  2009, Vol. 44 Issue (1): 231-244    DOI:
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湖北枣阳大阜山镁铁/超镁铁杂岩体与金红石矿床成因
洪吉安1, 马斌1, 黄琦2
1. 中国科学技术大学地球和空间科学学院壳幔物质与环境重点实验室, 合肥, 230026;
2. 湖北省地质矿产局鄂西北地质研究所, 湖北, 襄樊, 441000
The Dafushan mafic/ultramafic complex and genesis of the related rutile ore deposit at Zaoyang,Hubei
Hong Ji'an1, Ma Bin1, Huang Qi2
1. Key Laboratory of Crest-Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026;
2. Institute of Northwest Hubei Geodogy, Bureau of Geology and Minerai Resources of Hubei Prouince, Xdangfan, Hubei 441000
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摘要 湖北省北部枣阳市境内的大阜山镁铁/超镁铁杂岩体主要由未变质的纯橄岩和橄长岩组成,伴生变质的石榴石角闪石岩、石榴石钠黝帘石角闪石岩和角闪石钠黝帘石岩.杂岩体的围岩为大理岩.该岩体中的金红石矿床产于变质的石榴石角闪石岩或蚀变的石榴石角闪石岩中.橄长岩中锆石SHRIMP U-Pb同位素定年结果表明镁铁/超镁铁质岩体的成岩年龄约为600Ma.变质的岩石和未变质的岩石几乎具有完全相同的地球化学特征,表明前者的原岩应为橄长岩,整个岩体是一个分异的镁铁/超镁铁侵入体.金红石赋存于角闪石解理中等岩相特征表明矿床的含矿岩石就是石榴石角闪石岩,不是由石榴石辉石岩退变质形成的;且其中的石榴石为钙铁榴石,不是富镁、富铝的与高压/超高压作用有关的石榴石.金红石矿床的形成和岩体的局部变质应该与由北向南的近水平推覆构造有关,动力变质作用提供的热和流体,结合推覆过程中的变形作用,导致围岩大理岩和镁铁质岩体发生交代作用,形成石榴石角闪石岩和金红石矿床.
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关键词金红石矿床   橄长岩   石榴石角闪石岩   动力变质   湖北大阜山     
Abstract: The Dafushan mafic/ultramafic complex at Zaoyang, northern Hubei, located to the south of the Qinling-Tongbai-Dabie orogen.The complex consisted dominantly of not only peridotite arid troctolite,but also garnet amphibolite,garnet saussurite amphibolite and amphibole saussuritite, and surounded by the marble.The hosting ruble ore doposit occurred within metamorphic garnet amphibolite or altered garnet amphiholites.The zircon U-Pb SHRIMP data from the troctolite showed the emplacement age about 600 Ma for the mafic/ultramafic intrusions.All these rocks shared almost the same geoohemical characteristics for the unaltered maficlultramafic intrusive rocks and the metamorphic rocks,which suggested the protoliths of the metamorphic garnet amphibolite being probably troctolite,and all the complex being a differentiated mafic/ ultramafic intrusive body.The ruble occurring within the intersections of two cleavages of amphibote suggested that the primary ore-host rock should be garnet amphibolite rather than garnet pyroxenite,which was thought to be retrograded to later garnet amphibolite.The garnet was andradite rather than Mg and Al-rich one related to high-pressure metamorphism, suggesting none of involvement into the lndosinian ultrahigh pressure metamorphism.The formation of ruble ore deposit and localized metamorphism for the maficluItramafic complex might be resulted from the horizontal thrusting southwards.The energy and fluid by the thrusting combined with the deformation of the mafic/ultramaflc intrusive rocks caused the metasomatic metamorphism between the intrusive body and its wall rock carbonate one, and formed garnet amphibolites and ruble ore deposit.
Key wordsRuble ore   Troetolite   Garnet amphibolites   Dynamical metamorphism   Dafustian in Hubei   
收稿日期: 2007-10-29;
基金资助:

国家自然科学基金资助项目(批准号:40673007).

作者简介: 洪吉安,男,1968年5月生,博士,岩石学专业.e-mail:hja@ustc.edu.cn
引用本文:   
. 2009, 湖北枣阳大阜山镁铁/超镁铁杂岩体与金红石矿床成因. 地质科学, 44(1): 231-244.
. The Dafushan mafic/ultramafic complex and genesis of the related rutile ore deposit at Zaoyang,Hubei[J]. Chinese Journal of Geology, 2009, 44(1): 231-244.
 
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[1] 敖卫华, 黄文辉, 唐修义, 陈萍. 构造附加动力对煤变质过程的影响[J]. 地质科学, 2012, (2): 517-529.
 
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