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地质学报  2012 

白云鄂博地区相关地质单元的铁同位素特征及其对白云鄂博矿床成因的制约

, PP. 819-828

Keywords: 白云鄂博,Fe同位素,条带状铁建造,微晶丘,铁矿

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Abstract:

白云鄂博Fe-REE-Nb矿床是世界著名的巨型多金属矿床,它的成因一直是个激烈争论的问题,观点主要集中在沉积成因和岩浆成因上,而铁的物质来源问题是争论的焦点之一。近年来Fe同位素的快速发展为解决白云鄂博铁矿的成因提供了新思路。对白云鄂博地区发育的白云鄂博群尖山组铁质板岩、宽沟北沉积型铁矿、腮林忽洞微晶丘、灰绿岩墙这些相关地质单元的Fe同位素组成特征进行了研究,为白云鄂博矿床成因研究提供了最直接的参考。结果表明,尖山组铁质板岩的δ??56?Fe值为-0.49‰~0.48‰,平均值为-0.03‰±0.84‰,2SD,?n?=5;宽沟北沉积型铁矿的δ??56?Fe值为-0.68‰~0.23‰,平均值为-0.10‰±0.78‰,2SD,?n?=5;腮林忽洞微晶丘δ??56?Fe值为?-0.64‰?~0.12‰,平均值为-0.28‰±0.57‰,2SD,?n?=6;辉绿岩的Fe同位素组成δ??56?Fe值集中在0.11‰~?0.16‰?。腮林忽洞微晶丘总体上比白云鄂博赋矿白云岩富集Fe的轻同位素,Fe同位素组成变化也相对更大,表明两者可能有不同的成因。白云鄂博地区尖山组铁质板岩、宽沟北沉积型铁矿与世界其他地区含铁沉积建造的Fe同位素组成类似,其共同特征是,Fe同位素变化较大,总体上δ??56?Fe大于0‰。这一特征与白云鄂博铁矿的Fe同位素组成差别较大。白云鄂博矿床的δ??56?Fe集中在0‰附近,与白云鄂博地区灰绿岩、世界不同地区火成岩和岩浆型铁矿的Fe同位素组成特征一致。表明白云鄂博铁矿可能不是沉积成因的,更有可能与岩浆作用有关。

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