Sulfide and Fe-Ti-P liquid immiscibility in the Ni-Cu-Co ovoid deposit of the Voisey’s Bay complex, Labrador, Canada

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Stefano Caruso, Margaux Le Vaillant, Stephen J. Barnes, Ville J. Virtanen, Giada Iacono-Marziano
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Abstract

In the Voisey’s Bay complex, sulfide-matrix breccias developed through the percolation of dense sulfide melt, leading to the displacement of the silicate melt within partially molten silicate-matrix breccias. In these sulfide matrix-breccias, hydrous silicate rims are commonly present at the interface between the sulfide matrix and the silicate framework. Multiple lines of evidence support a magmatic origin of these hornblende-biotite rims, which was largely coeval with the emplacement of the sulfide melt in the magmatic breccias. The formation of the hornblende-biotite rims required the addition of alkalis and water that could not have entirely been sourced from either the sulfide melt or the silicate framework. Through the integration of compositional maps with major and trace element analyses of the main accessory minerals, we propose that the critical components required for the development of the hydrous silicate rims in sulfide-matrix breccias originated from an immiscible Fe-Ti-P melt. Distinct textural and compositional features of apatite, hercynite, ilmenite and magnetite support the presence of small amounts of Fe-Ti-P melt in the sulfide melt. This Fe-Ti-P melt likely formed through melt immiscibility in the early stages of the development of the Voisey’s Bay complex, and was transported in the magma conduits together with the sulfide melt.

Abstract Image

加拿大拉布拉多沃韦西湾复合体镍铜钴卵形矿床中的硫化物和铁钛铂液态不溶性
在沃塞湾复合地层中,硫化物基质角砾岩是通过高密度硫化物熔体的渗滤作用形成的,导致硅酸盐熔体在部分熔融的硅酸盐基质角砾岩中发生位移。在这些硫化物基质角砾岩中,硫化物基质与硅酸盐框架之间的界面通常存在水合硅酸盐边缘。多种证据表明,这些角闪石-黑云母边缘起源于岩浆,在很大程度上与岩浆角砾岩中硫化物熔体的置换同时发生。角闪石-生物岩边缘的形成需要添加碱和水,而这些碱和水不可能完全来自硫化物熔体或硅酸盐框架。通过将成分图与主要附属矿物的主要元素和痕量元素分析相结合,我们提出硫化物基质角砾岩中水合硅酸盐边缘形成所需的关键成分源自不相溶的Fe-Ti-P熔体。磷灰石、hercynite、钛铁矿和磁铁矿独特的纹理和成分特征证明硫化物熔体中存在少量的Fe-Ti-P熔体。这种Fe-Ti-P熔体很可能是在沃塞湾复合体发展的早期阶段通过熔融不溶性形成的,并与硫化物熔体一起在岩浆导管中运移。
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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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