Characteristics of the genetic mineralogy of pyrite and its significance for prospecting in the Denggezhuang gold deposit, Jiaodong Peninsula, China
Characteristics of the genetic mineralogy of pyrite and its significance for prospecting in the Denggezhuang gold deposit, Jiaodong Peninsula, China
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DOI：
10.1007/s11430-013-4706-2
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发表时间：
2014-01
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影响因子：
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通讯作者：
J. Xue;Sheng‐Rong Li;Wen Sun;YunQiang Zhang;Xu Zhang
中科院分区：
文献类型：
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作者：
J. Xue;Sheng‐Rong Li;Wen Sun;YunQiang Zhang;Xu Zhang
本文通过对邓各庄石英脉型金存款矿床的晶体习性、化学成分、黄铁矿热电性特征及矿物学填图的详细研究，揭示了大深度范围内黄铁矿标型参数的变化规律及金的富集规律，为深部找矿预测提供了矿物标志。本文初步探讨了矿化强度与矿物学参数时空演化的相关性，阐明了金成矿的物理化学条件，为深部成矿预测提供了有用的信息。黄铁矿的结晶习性十分复杂，主要以{100}、{210}及它们的组合形式存在。{210}和{100}+{210}与金矿化成矿呈正相关，{100}+{210}可作为寻找富矿段的有效指标。黄铁矿的组成以贫S富As为特征。其典型微量元素为Mo、As、Pb、Cu、Bi、Zn、Au、Co、Se、Sb、Ag、Ni、Cr、Te。不同阶段黄铁矿微量元素含量的平均值表明，从成矿早期到成矿期，结晶温度逐渐降低。Au、Ag的沉淀富集主要发生在石英黄铁矿阶段（III）和多金属矿物阶段（IV）。P型黄铁矿的出现率（P（%））为83.52%。与胶东半岛其他矿床相比，邓各庄金存款矿床中黄铁矿的热电系数（α）具有较大的离散性。黄铁矿I ~ V的电导率组合特征为P <$N→P>N→P <$N→P <$N → P <$N，这通常被认为是有利成矿的。As+Sb+Se+Te和Co+Ni的相对含量与P型和N型的平均值及其出现率密切相关。根据黄铁矿结晶温度、矿化强度和剥蚀程度，邓各庄金存款的成矿温度为150-322°C，属中低温。矿体已剥蚀至中上部，矿体规模大于900 m。根据黄铁矿热电系数的垂直分带和P型黄铁矿填图，认为I2- 2号矿体94线东北部-425 ~-800 m段具有找矿潜力。
This paper reports the variation rules for the typomorphic parameters of the pyrite and the gold enrichment rules of the Denggezhuang quartz vein gold deposit at a large-depth scale, providing the mineral signs for deep prospecting prediction through detailed study of the characteristics of crystal’ habits, chemical composition, the thermoelectricity of pyrites, and mineralogical mapping. This paper primarily discusses the correlation between the mineralization intensity and the space-time evolution of the mineralogical parameters, clarifies the physicochemical conditions during gold mineralization, and provides information useful for deep mineralization prediction. We demonstrate that the crystal habits of the pyrites are very complex, primarily occurring as {100}, {210}, and their combinate form. {210} and {100}+{210} have positive correlations with gold mineralization, and {100}+{210} therefore can be useful for locating rich ore segments. The composition of pyrites is characteristically poor in S and rich in As. Their typical trace elements are composed of Mo, As, Pb, Cu, Bi, Zn, Au, Co, Se, Sb, Ag, Ni, Cr, and Te. The average contents of trace elements in pyrites from various stages show that the crystallizing temperature gradually decreased from an early stage to the metallogenic episodes. The precipitation and accumulation of Au and Ag occur primarily in the quartz-pyrite stage (III) and the polymetal minerals stage (IV). The occurrence rate of P-type pyrites (P(%)) is 83.52%. There is a larger dispersion of the thermoelectrical coefficient of pyrite (α) in the Denggezhuang gold deposit than in other deposits in the Jiaodong Peninsula. The electrical conductivity assemblage of pyrites from I to V is characterized by P⩾N→P>N→P≫N→P≫N→P⩾N, which is usually considered beneficial for mineralization. The relative contents of As+Sb+Se+Te and Co+Ni are closely correlated to P-type and N-type average values and their occurrence rates. According to the crystallizing temperature of pyrite, the mineralization intensity, and the denudation degree, the mineralization temperature of the Denggezhuang gold deposit is in the range of 150–322°C and is of a medium-low temperature. The orebody has already become denuded to the top-middle of the orebody, and the size of the orebody is larger than 900 m. Based on the vertical zoning of the thermoelectrical coefficients of pyrites and P-type pyrite mapping, it is suggested that the segment between −425 and −800 m may have exploration potential to the northeast of line 94 of the No. I2-2orebody.