Chemical composition of the chromite and diamond potentiality of Bailushan rock mass in Suining area of Xuzhou
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摘要: 白露山岩体是苏北地区重要的金刚石含矿岩体。通过研究该岩体中的铬铁矿化学成分,探讨其成因及金刚石的含矿性,进一步分析金刚石的成矿潜力。白露山岩体中的铬铁矿具有高Cr、低Al、高Mg的特征,属于镁铬铁矿,是深部地幔橄榄岩结晶而成的,不是岩体本身的结晶产物,可能来源于岩体中的深源捕虏体。铬铁矿的结晶温度为1 253~1 354 ℃,与金刚石的形成温度(1 150~1 400 ℃)相近,二者关系密切。铬铁矿化学成分与山东、辽宁含矿金伯利岩中铬铁矿的化学成分较相似,多数属于S4组和S6组铬铁矿,少数属于S1组和S2组铬铁矿,其中S1组和S2组铬铁矿是含矿岩体的标型矿物。白露山岩体具有良好的金刚石成矿潜力和找矿前景。Abstract: Bailushan rock mass is an important diamond-bearing rock mass in Northern Jiangsu Province. On the basis of the chemical composition of the chromite in Bailushan rock mass, the authors discussed its genesis and significance of the diamond potentiality and analyzed the diamond mineralization potential of Bailushan rock mass. The chromite in Bailushan rock mass has characteristics of high Cr, low Al and high Mg, which belongs to the magnochromite. It was crystallized from the peridotite that originated from the deep mantle, not a crystalline product of the rock mass, which is most likely derived from a deep-source trap in the rock mass. The crystallization temperature is 1 253~1 354 ℃, which is consistent with the formation temperature of the diamond (1 150~1 400 ℃), indicating a close relationship between them. The chemical composition of the chromite from Bailushan rock mass is very similar to that from the ore-bearing kimberlites in Shandong and Liaoning. Most chromites belong to S4 and S6, and a few chromites belong to S1 and S2. S1 and S2 chromites are the marked minerals of diamond-bearing rock mass. Bailushan rock mass has good diamond potential and prospecting prospects.
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Keywords:
- Bailushan rock mass /
- chromite /
- chemical compostion /
- diamond potentiality
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