橄欖石成分揭示了加拿大安大略省安山岩钯矿化Lac des Iles岩群的母岩是安山岩

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2024-05-14 DOI:10.1007/s00126-024-01257-4
W. D. Smith, L. Fay, J. E. Mungall, M. Shahabi Far, L. Djon
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引用次数: 0

摘要

这里首次报道了长石蛭石和哈兹伯格岩,它们位于南部的伊勒湖复合体中;伊勒湖复合体是一个约 2.69 千兆年前的弧状黑云母侵入体,在变粒和角砾岩化的榴辉岩中蕴藏着世界级的钯矿化。含橄榄石的岩石(Mg#75.9-80.8)颗粒中等到粗大,蛇纹石化程度从弱到强,并以不同程度的蚀变诺拉石为边界。它们具有相对较高的 Al2O3 含量(4.8-10.3 wt.%)、明显的负 Nb/Nb* 值(0.07-0.25)、平坦至浅负斜的 REE 剖面(La/YbN 1.3-4.4)以及可变的 Eu/Eu* 值(0.4-1.6)。弱蚀变样品包括亚方形橄榄石(Fo78.6-81.8),带有多矿物熔融包裹体和包晶正长石边缘、积层正长石、亚黝帘石clinopyroxene,以及塑性变形和成团的斜长石晶体。随着蚀变程度的增加,橄榄石被滑石、碳酸盐、磁铁矿和铁硫化物组合不同程度地蛇纹石化或假象取代。带有铂族矿物(zvyagintsevite、kotulskite 和 sperrylite)的稀疏散布的辉铜矿-黄铜矿-黄铁矿(±闪锌矿)斑点非常罕见,通常部分被磁铁矿取代。镍的浓度主要受橄榄石(1900-4200 ppm Ni)控制,整个岩石中氧化镁和镍含量之间的正相关关系也证明了这一点。硫、铜、钯和铂呈正相关,钯/铂值范围在 2.6 到 6.7 之间。通过模拟水成安山岩岩浆与前生长石堆积物的分批结晶,可以复制整个岩石和矿物成分。母岩浆在喷出时可能处于或接近硫化物饱和状态,并可能与富含挥发性物质的相共存。Lac des Iles复合体可作为与阿基坦大陆弧有关的岩浆硫化物矿床的典型范例,其母岩是肥沃的安山岩母岩,由原始弧下地幔熔体在幼壳中分化形成。
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Olivine compositions reveal an andesitic parent magma for the Archean palladium-mineralized Lac des Iles Complex of Ontario, Canada

Feldspathic lherzolite and harzburgite are reported here for the first time in the southern Lac des Iles Complex; an ~ 2.69-Ga arcuate mafic intrusion that hosts world-class Pd mineralization within varitextured and brecciated gabbronoritic rocks. The olivine-bearing rocks (Mg#75.9–80.8) are medium- to coarse-grained, weakly to strongly serpentinized, and bordered by variably altered norite. They possess relatively high Al2O3 contents (4.8–10.3 wt.%), pronounced negative Nb/Nb* (0.07–0.25) values, flat to shallow negatively sloping REE profiles (La/YbN 1.3–4.4), and variable Eu/Eu* (0.4–1.6) values. Weakly altered samples comprise subhedral olivine (Fo78.6–81.8) with polymineralic melt inclusions and peritectic orthopyroxene rims, cumulus orthopyroxene, sub-poikilitic clinopyroxene, as well as plastically deformed and clustered plagioclase crystals. With increasing degrees of alteration, olivine is variably serpentinized or pseudomorphically replaced by an assemblage of talc, carbonate, magnetite, and Fe-sulfides. Sparsely disseminated pentlandite-chalcopyrite-pyrrhotite (± sphalerite) blebs with platinum-group minerals (zvyagintsevite, kotulskite, and sperrylite) are rare and commonly partially replaced by magnetite. Nickel concentrations are primarily controlled by olivine (1900–4200 ppm Ni), as supported by a positive correlation between whole-rock MgO and Ni contents. Sulfur, Cu, Pd, and Pt show positive correlations and Pd/Pt values range from 2.6 to 6.7. The whole-rock and mineral compositions can be replicated through the modeling of batch crystallization of a hydrous andesitic magma that has interacted with antecedent feldspathic cumulates. The parent magma was likely at or close to sulfide saturation upon emplacement and may have co-existed with a volatile-rich phase. The Lac des Iles Complex may serve as a type example of Archean continental arc-related magmatic sulfide deposits, fed by fertile andesitic parent magmas formed through the differentiation of primitive sub-arc mantle melts in the juvenile crust.

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来源期刊
Mineralium Deposita
Mineralium Deposita 地学-地球化学与地球物理
CiteScore
11.00
自引率
6.20%
发文量
61
审稿时长
6 months
期刊介绍: The journal Mineralium Deposita introduces new observations, principles, and interpretations from the field of economic geology, including nonmetallic mineral deposits, experimental and applied geochemistry, with emphasis on mineral deposits. It offers short and comprehensive articles, review papers, brief original papers, scientific discussions and news, as well as reports on meetings of importance to mineral research. The emphasis is on high-quality content and form for all articles and on international coverage of subject matter.
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