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Re-Os PYRITE GEOCHRONOLOGY OF THE YELLOWHEAD-TYPE MINERALIZATION, PEND OREILLE MINE, KOOTENAY ARC, METALINE DISTRICT, WASHINGTON
Economic Geology ( IF 5.8 ) Pub Date : 2020-11-01 , DOI: 10.5382/econgeo.4720
Suzanne Paradis 1 , Danny Hnatyshin 2, 3 , George J. Simandl 4, 5 , Robert A. Creaser 2
Affiliation  

Pend Oreille, a carbonate-hosted Zn-Pb sulfide deposit, is the only base metal mine recently in production within the historically prolific Kootenay arc belt. The deposit consists of two spatially and lithologically distinct types of stratabound, carbonate-hosted Zn-Pb mineralization: Josephine and Yellowhead. The Yellowhead-type sulfide mineralization, the focus of this study, consists of en échelon tabular to lensoidal pyrite-sphalerite–rich orebodies hosted by the middle Cambrian to Early Ordovician Metaline Formation. The Yellowhead-type mineralization is characterized by carbonate replacement and open-space filling textures, indicating diagenetic and epigenetic origin. As with most low-temperature deposits not directly associated with igneous activity, the timing of sulfide mineralization has traditionally been difficult to constrain using radiometric methods.In this study, we present a new Re-Os age of 512 ± 17 Ma from the Yellowhead mineralization. Combining this age date with the Cambrian-Ordovician fossil record of the host Metaline Formation and detailed textural analysis of the mineralization, we conclude that the Yellowhead sulfide mineralization is largely diagenetic in origin. Such an origin for the Yellowhead mineralization is similar to that of Irish-type deposits worldwide. For explorationists, the presence of Irish-type deposits in the United States portion of the Kootenay arc opens the possibility of discovering similar mineralization in the Canadian extension of the Kootenay arc.

中文翻译:

黄头型矿化的Re-Os黄铁矿年代学,彭德雷里尔矿,库特纳伊弧,金属矿区,华盛顿

Pend Oreille是由碳酸盐形成的Zn-Pb硫化物矿床,是最近在历史悠久的Kootenay弧带中唯一生产的贱金属矿。该矿床由两种在空间和岩性上不同的,由地层约束的,碳酸盐岩包裹的Zn-Pb矿化组成:约瑟芬和黄石。这项研究的重点是Yellowhead型硫化物矿化,其组成是由中寒武纪至奥陶纪早期金属矿形成的富含埃谢隆的板状至片状黄铁矿-闪锌矿富矿。Yellowhead型矿化的特征是碳酸盐替代和开放空间填充质地,表明成岩和表观成因。与大多数与火成活动不直接相关的低温沉积物一样,传统上,使用放射线法很难控制硫化物矿化的时间。在这项研究中,我们提出了黄头矿化的新Re-Os年龄512±17 Ma。结合该年龄数据与宿主金属矿床的寒武纪-奥陶纪化石记录以及矿化的详细组织分析,我们得出结论,黄石硫化物矿化的成因主要是成岩作用。Yellowhead矿化的起源与全球爱尔兰类型的矿床相似。对于勘探者而言,在库特尼弧的美国部分存在爱尔兰型矿藏,为在库特尼弧的加拿大延伸区发现类似矿化提供了可能性。我们提出了一个来自Yellowhead矿化的新Re-Os年龄512±17 Ma。结合该年龄数据与宿主金属矿床的寒武纪-奥陶纪化石记录以及矿化的详细组织分析,我们得出结论,黄石硫化物矿化的成因主要是成岩作用。Yellowhead矿化的起源与全球爱尔兰类型的矿床相似。对于勘探者而言,在库特尼弧的美国部分存在爱尔兰型矿藏,为在库特尼弧的加拿大延伸区发现类似矿化提供了可能性。我们提出了一个来自Yellowhead矿化的新Re-Os年龄512±17 Ma。结合该年龄数据与宿主金属矿床的寒武纪-奥陶纪化石记录以及矿化的详细组织分析,我们得出结论,黄石硫化物矿化的成因主要是成岩作用。Yellowhead矿化的起源与全球爱尔兰类型的矿床相似。对于勘探者而言,在库特尼弧的美国部分存在爱尔兰型矿藏,为在库特尼弧的加拿大延伸区发现类似矿化提供了可能性。我们得出的结论是,黄石硫化物矿化的成因主要是成岩作用。Yellowhead矿化的起源与全球爱尔兰类型的矿床相似。对于勘探者而言,在库特尼弧的美国部分存在爱尔兰型矿藏,为在库特尼弧的加拿大延伸区发现类似矿化提供了可能性。我们得出的结论是,黄石硫化物矿化的成因主要是成岩作用。Yellowhead矿化的起源与全球爱尔兰类型的矿床相似。对于勘探者而言,在库特尼弧的美国部分存在爱尔兰型矿藏,为在库特尼弧的加拿大延伸区发现类似矿化提供了可能性。
更新日期:2020-09-22
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