天山北部石炭纪埃达克岩-高镁安山岩-富Nb岛弧玄武质岩:对中亚造山带显生宙地壳增生与铜金成矿的意义

王强 赵振华 许继峰 Derek A.WYMAN 熊小林 资峰 白正华. 天山北部石炭纪埃达克岩-高镁安山岩-富Nb岛弧玄武质岩:对中亚造山带显生宙地壳增生与铜金成矿的意义[J]. 岩石学报, 2006, 22(1): 11-30.
引用本文: 王强 赵振华 许继峰 Derek A.WYMAN 熊小林 资峰 白正华. 天山北部石炭纪埃达克岩-高镁安山岩-富Nb岛弧玄武质岩:对中亚造山带显生宙地壳增生与铜金成矿的意义[J]. 岩石学报, 2006, 22(1): 11-30.
WANG Qiang, ZHAO ZhenHua, XU JiFeng, Derek A. WYMAN, XIONG XiaoLin, ZI Feng, BAI ZhengHua. Carboniferous adakite-high-Mg andesite-Nbenriched basaltic rock suites in the Northern Tianshan area:Implications for Phanerozoic crustal growth in the Central Asia Orogenic Belt and Cu-Au mineralization.[J]. Acta Petrologica Sinica, 2006, 22(1): 11-30.
Citation: WANG Qiang, ZHAO ZhenHua, XU JiFeng, Derek A. WYMAN, XIONG XiaoLin, ZI Feng, BAI ZhengHua. Carboniferous adakite-high-Mg andesite-Nbenriched basaltic rock suites in the Northern Tianshan area:Implications for Phanerozoic crustal growth in the Central Asia Orogenic Belt and Cu-Au mineralization.[J]. Acta Petrologica Sinica, 2006, 22(1): 11-30.

天山北部石炭纪埃达克岩-高镁安山岩-富Nb岛弧玄武质岩:对中亚造山带显生宙地壳增生与铜金成矿的意义

  • 基金项目:

    国家重点基础研究发展规划项目(2001CB409803)、国家自然科学基金项目(40421303、40372041、40572042、40425003)和中国科学院知识创新项目(KZCX3-SW-122,KZCX2-SW-117和A15-041107)的资助.致谢 第一作者衷心地感谢高俊研究员、刘伟研究员一直对本研究的关心和支持.张旗研究员、钱青博士对本文的初稿提出了宝贵的建议,戴撞模研究员帮助进行了^40Ar-^39Ar年龄分析,唐功建帮助收集了部分资料,一并表示感谢!

Carboniferous adakite-high-Mg andesite-Nbenriched basaltic rock suites in the Northern Tianshan area:Implications for Phanerozoic crustal growth in the Central Asia Orogenic Belt and Cu-Au mineralization.

  • 新疆天山北部地区存在有石炭纪的埃达克岩-高镁安山岩-富Nb玄武质岩组合,并且其中许多岩石与铜(金)矿床伴生(如达巴特、阿希、土屋-延东、赤湖,等等)。埃达克岩富钠、高Sr但亏损Y与Yb,无明显Eu-正Eu异常以及正Sr异常与Nb、Ti亏损。高镁安山(闪长)岩是本次研究首次报道的,这些岩石无明显Eu-正Eu异常以及Nb、Ti亏损,普遍具有高的MgO和Cr、Ni含量,其中阿希金矿区一些样品类似于日本西南新生代Setouchi弧火山岩带中的赞岐岩类。富Nb玄武质岩富钠贫钾,具有微弱负.正Ba、Nb和Ti异常以及高的Nb/La比值,不同于大多数正常岛弧玄武岩。天山北部地区石炭纪埃达克岩具有高的8Nd(t)(+3.4-+9.0)和低的(^87Sr/^86Sr)i(0.7032—0.7043)。富Nb玄武质岩具有变化的εNd(t)(+3.6-+11.6)和(^87Sr/^86Sr);(0.7007—0.7067)。我们的研究表明,天山北部地区石炭纪埃达克岩-高镁安山岩-富Nb玄武质岩组合可能是“埃达克岩交代的岛弧岩浆岩系列”。埃达克岩最有可能由石炭纪北天山洋的年轻洋壳在俯冲过程中熔融形成。另外,俯冲板片产生的熔体以及所释放的少量流体在上升过程中可能交代地幔楔橄榄岩或与其发生反应:一方面,触发地幔楔橄榄岩发生熔融形成富Nb岛弧玄武质岩;另一方面,地幔组分迅速进入到板片熔体中,导致其地幔组分增加,乃至形成高镁安山岩。因此,天山北部地区石炭纪埃达克岩-高镁安山岩-富Nb玄武质岩组合表明:(1)天山北部地区石炭纪可能为岛弧环境而非裂谷环境;(2)天山地区石炭纪的地壳生长可能以侧向增生为主;(3)除了亏损地幔之外,俯冲洋壳的熔融可能也在地壳的生长中发挥了重要的作用;(4)俯冲板片产生的埃达克质岩浆具有高的氧逸度,而其与地幔楔橄榄岩的强烈相互作用将导致地幔中的金属硫化物分解,成矿金属元素进入到岩浆中。这可能是新疆北部铜金矿化与一些埃达克岩、高镁安山(闪长)岩或富Nb岛弧玄武质岩密切共生的基本原因。
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出版历程
收稿日期:  2005-11-22
修回日期:  2005-12-09
刊出日期:  2006-01-31

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