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首页> 外文期刊>Journal of Asian earth sciences >Geological, geochronological, and mineralogical constraints on the genesis of the Chengchao skarn Fe deposit, Edong ore district, Middle-Lower Yangtze River Valley metallogenic belt, eastern China
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Geological, geochronological, and mineralogical constraints on the genesis of the Chengchao skarn Fe deposit, Edong ore district, Middle-Lower Yangtze River Valley metallogenic belt, eastern China

机译：中国东部长江中下游成矿带鄂东矿区成潮矽卡岩铁矿成因的地质，年代学和矿物学约束

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摘要

The Edong ore district is located within the westernmost Middle-Lower Yangtze River Valley metallogenic belt (MLYRB), and hosts the largest concentration of skarn Fe deposits in China, although the origin of these deposits remains controversial. The Chengchao deposit is the largest skarn Fe deposit so far discovered within the MLYRB, and provides a good opportunity to address the debate surrounding the origin of these skarn Fe deposits. Here, we present geological, geochronological, and mineralogical data from the Chengchao skarn deposit and associated intrusions, and discuss the relationships between granitoids and mineralization in the Chengchao deposit. The NW-SE-striking orebodies in the study area have porphyritic quartz monzonite and/or granite footwalls, and Triassic marble or diorite hangingwalls, indicating a spatial relationship between these intrusions and Fe mineralization. Zircon U-Pb data from the granite, porphyritic quartz monzonite, diorite, and porphyritic diabase dike within the deposit show ages of 129 ±1, 128 ±1, 140 ±1, and 126 + 1 Ma, respectively. These ages and the previously reported ages on the timing of mineralization suggest that the porphyritic quartz monzonite and granite are coeval with the formation of the skarn Fe deposit. Our data confirm that the granitic rocks are temporally associated with Fe mineralization. The prograde substage of skarn development is characterized by two stages of andradite (Adr_(98-38)Grs_(61-2) Prp_(2-0)Sps_(1-0)Alm_(1-0)) and diopside (Di_(95-61)Hd_(37-5)Jo_(3-0)), including an early stage of garnet and pyroxene formation that is genetically associated with the mineralization. The early stage garnets are more andra-dite-rich (Adr_(98-50)Grs_(49-2)Prp_(1-0)Sps_(1-0)Alm_0) than the late veinlet garnets characterized by intermediate grandite compositions (Adr_(67-37)Grs_(61-31)Prp_(2-0)Sps_(1-0)Alm_(1-0)). The early stage pyroxenes (Di_(95-74)Hd_(26-5)Jo_(1-0)) are compositionally distinct from the late stage pyroxenes (Di_(84-61)Hd_(37-16)Jo_(3-0)). Compositional variations of early stage garnets in the zoned skarns indicate that skarn formation and Fe mineralization are genetically associated with the porphyritic quartz monzonite and granite intrusions. The geological, geochronological, and mineralogical evidence indicates that the porphyritic quartz monzonite and granite intrusions in the Chengchao Fe deposit are spatially, temporally, and genetically associated with Fe mineralization.
机译：鄂东矿区位于长江中下游最西部成矿带（MLYRB）内，是中国矽卡岩型铁矿床的最大聚集地，尽管这些矿床的来源仍存在争议。澄超矿床是迄今为止在MLYRB内部发现的最大的矽卡岩型铁矿床，为解决围绕这些矽卡岩型铁矿床起源的争论提供了一个很好的机会。在这里，我们介绍了成潮矽卡岩矿床的地质，年代学和矿物学数据以及相关的侵入岩，并讨论了成潮矿床中花岗岩与矿化之间的关系。研究区的西北向SE矿体具有斑状石英蒙脱石和/或花岗岩底盘，以及三叠纪大理石或闪长岩壁，表明这些侵入与铁矿化之间存在空间关系。沉积物中花岗岩，斑状石英蒙脱石，闪长岩和斑状辉绿岩堤的锆石U-Pb数据分别显示年龄为129±1、128±1、140±1和126 + 1 Ma。这些年龄和先前报道的矿化时间年龄表明，斑岩性石英蒙脱石和花岗岩与矽卡岩铁矿床的形成同时期。我们的数据证实，花岗岩岩在时间上与铁矿化有关。矽卡岩发育的晚期子阶段的特征是andradite（Adr_（98-38）Grs_（61-2）Prp_（2-0）Sps_（1-0）Alm_（1-0））和透辉石（Di_（ 95-61）Hd_（37-5）Jo_（3-0）），包括石榴石和辉石形成的早期阶段，这与成矿作用在遗传上相关。早期石榴石比以中层花岗岩组成（Adr_）为特征的晚期小石榴石具有更高的安德拉特石榴石（Adr_（98-50）Grs_（49-2）Prp_（1-0）Sps_（1-0）Alm_0）。 （67-37）Grs_（61-31）Prp_（2-0）Sps_（1-0）Alm_（1-0））。早期辉石（Di_（95-74）Hd_（26-5）Jo_（1-0））在成分上不同于晚期辉石（Di_（84-61）Hd_（37-16）Jo_（3-0 ））。带状矽卡岩中早期石榴石的成分变化表明，矽卡岩的形成和铁矿化与斑岩性石英蒙脱石和花岗岩侵入体有遗传联系。地质，年代学和矿物学证据表明，成朝铁矿床中的斑岩性石英辉石和花岗岩侵入体在空间，时间和遗传上与铁矿化有关。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第1期|68-82|共15页
  • 作者

    Lei Yao; Guiqing Xie; Jingwen Mao; Zhicheng Lue; Caisheng Zhao; Xianwei Zheng; Ning Ding;

  • 作者单位

    Faculty of Geosciences and Resources, China University of Geosciences, Beijing 100083, People's Republic of China ,Development and Research Center, China Geological Survey, Beijing 100037, People's Republic of China ,Mineral Exploration Technical Guidance Center, Ministry of Land and Resources of the People's Republic of China (MLR), Beijing 100120, People's Republic of China;

    Ministry of Land and Resources of the People's Republic of China (MLR), Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China ,Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, No. 26 Baiwanzhuang Road, Beijing 100037, People's Republic of China;

    Ministry of Land and Resources of the People's Republic of China (MLR), Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, People's Republic of China;

    Development and Research Center, China Geological Survey, Beijing 100037, People's Republic of China ,Mineral Exploration Technical Guidance Center, Ministry of Land and Resources of the People's Republic of China (MLR), Beijing 100120, People's Republic of China;

    Technology and International Cooperation Division, Ministry of Land and Resources of the People's Republic of China (MLR), Beijing 100034, People's Republic of China;

    Chengchao Iron Mine of Wuhan Iron & Steel Group Minerals Co., Ltd, Ezhou 436051, People's Republic of China;

    Geological Survey of Anhui Province, Hefei 230001, People's Republic of China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Skarn Fe deposit; Zircon U-Pb dating; Mineralogy; Edong ore district; Middle-Lower Yangtze River Valley; metallogenic belt;

    机译：矽卡岩铁矿床;锆石U-Pb约会;矿物学;鄂东矿区长江中下游流域;成矿带;

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