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首页> 外文期刊>Zeitschrift der Deutschen Gesellschaft fur Geowissenschaften: ZDGG >Mineralogical characterization of podiform chromitite deposits in the Mirdita Ophiolite, Albania
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Mineralogical characterization of podiform chromitite deposits in the Mirdita Ophiolite, Albania

机译：米德托氏菌矿床矿床矿床矿床沉积物，阿尔巴尼亚

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The Mirdita Ophiolite in Albania is part of an ophiolite belt occurring between the Apulian and Pelagonian subcontinents in the Balkan Peninsula. Within the Eastern Mirdita Ophiolite major chromite deposits are currently under production. Chromite is an important mineral for the supply of chromium that is a crucial component for steelmaking (ferrochrome market). The German market is entirely dependent on external suppliers. The main chromite production worldwide occurs as stratiform deposits associated with layered ultramafic-mafic intrusions as well as podiform chromite deposits within ophiolites. Various chromite ore-textures at the chromite deposits in Bulqiza range from massive, nodular to disseminated mineralization. The ratios Cr# (100~*Cr/Cr+Al) and Mg# (100~*Mg/Mg~+Fe~(2+)) of chromite are useful to study the crystallization history as well as post-magmatic processes affecting the chromite chemistry. The mineral chemistry of chromite, clinopyroxene, orthopyroxene, olivine, and serpentine was analysed by electron microprobe. Chromite chemistry indicates that pristine chromite exhibit a range in Cr# (69 to 93) and in Mg# (61 to 72). Serpentinization is typically observed within all investigated chromite deposits in the Mirdita Ophiolite. The degree of serpentinization increases from harzburgitic host to dunite envelope to nodular chromitite to disseminated chromitite to massive chromitite. Serpentine mesh cell pseudomorphs after olivine and pyroxene are frequently observed. Different generations of serpentinization and postmagmatic processes are generally present.
机译：阿尔巴尼亚的米尔迪塔蛇绿岩是发生在巴尔干半岛阿普利安和佩拉哥尼亚次大陆之间的蛇绿岩带的一部分。在东米尔迪塔蛇绿岩中，目前正在开采主要的铬铁矿矿床。铬铁矿是一种重要的铬供应矿物，铬是炼钢的关键成分（铬铁市场）。德国市场完全依赖外部供应商。世界范围内的铬铁矿主要产自与层状超镁铁质-镁铁质侵入体相关的层状矿床，以及蛇绿岩中的豆荚状铬铁矿矿床。布尔奇扎铬铁矿矿床的各种铬铁矿矿石结构从块状、结节状到浸染状矿化不等。铬铁矿的Cr#（100~*Cr/Cr+Al）和Mg#（100~*Mg/Mg+Fe~（2+）比值有助于研究结晶历史以及影响铬铁矿化学的岩浆后过程。用电子探针分析了铬铁矿、单斜辉石、斜方辉石、橄榄石和蛇纹石的矿物化学。铬铁矿化学表明，原始铬铁矿的Cr#（69至93）和Mg#（61至72）范围较大。在Mirdita蛇绿岩中所有调查的铬铁矿矿床中，通常都观察到蛇纹石化。蛇纹石化程度从方辉橄榄岩寄主到纯橄榄岩包层，再到结节状铬铁矿，再到浸染状铬铁矿，再到块状铬铁矿。经常观察到橄榄石和辉石之后的蛇纹石网状细胞假象。通常存在不同世代的蛇纹石化和岩浆期后过程。

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