加拿大育空地区Finlayson湖区ABM置换型火山岩块状硫化物矿床的矿物学与矿物化学

IF 4.4 2区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS Mineralium Deposita Pub Date : 2023-10-06 DOI:10.1007/s00126-023-01217-4
Nikola Denisová, Stephen J. Piercey, Markus Wälle
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引用次数: 0

摘要

ABM矿床是加拿大育空地区Finlayson Lake VMS地区一个由Yukon - tanana地块弧后亲和岩组成的双峰长英质、置换型火山岩块状硫化物矿床(VMS)。块状硫化物带呈叠置和层控透镜状,与火山地层近平行,被普遍存在的白色云母和/或绿泥石蚀变所包围。在块状硫化物透镜体中局部出现了火山岩残余碎屑和保存的层理,表明成矿是通过海底替换原有地层形成的。ABM矿床有3种矿物组合:(1)黄铁矿-黄铜矿-磁铁矿-磁黄铁矿组合,与cu - bi - se - co富集有关,出现在块状硫化物透镜体的中心;(2)黄铁矿-闪锌矿组合,多产于晶状体边缘,富集Zn-Pb-Ag-Au-Hg-As-Sb-Ba;(3)与绿泥石蚀变有关的黄铜矿-磁黄铁矿-黄铁矿条带组成的小型组合,主要发生在硫化物透镜体边缘。结合原位地球化学观测,对原生、带炼和变质结构进行了岩石学观察,结果表明黄铁矿-闪锌矿组合形成温度(~ 270℃)低于其他两种矿物组合(~ 270 ~ 350℃),并且所有矿物组合中的矿物化学均受到绿片岩相变质作用的影响,但影响仅限于重结晶、小尺度再活化(~ 1 m)和微量元素重分布。
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Mineralogy and mineral chemistry of the ABM replacement-style volcanogenic massive sulfide deposit, Finlayson Lake district, Yukon, Canada

The ABM deposit is a bimodal-felsic, replacement-style volcanogenic massive sulfide deposit (VMS) that is hosted by back-arc affinity rocks of the Yukon–Tanana terrane in the Finlayson Lake VMS district, Yukon, Canada. Massive sulfide zones occur as stacked and stratabound lenses subparallel to the volcanic stratigraphy, surrounded by pervasive white mica and/or chlorite alteration. Remnant clasts of volcanic rocks and preserved bedding occur locally within the massive sulfide lenses and indicate that mineralization formed through subseafloor replacement of pre-existing strata. Three mineral assemblages occur at the ABM deposit: (1) a pyrite–chalcopyrite–magnetite–pyrrhotite assemblage that is associated with Cu–Bi–Se–Co-enrichment and occurs at the center of the massive sulfide lenses; (2) a pyrite–sphalerite assemblage, which occurs more commonly towards lens margins and is enriched in Zn–Pb–Ag–Au–Hg–As–Sb–Ba; and (3) a minor assemblage comprising chalcopyrite–pyrrhotite–pyrite stringers associated with pervasive chlorite alteration, which occurs mostly at the sulfide lens margins. Petrographic observations of preserved primary, zone refining, and metamorphic textures in combination with in situ geochemistry show that the pyrite–sphalerite assemblage formed at lower temperatures (< 270 °C) than the other two mineral assemblages (~ 270–350 °C), and that mineral chemistry in all mineral assemblages was affected by greenschist facies metamorphism, although the effects are limited to recrystallization, small-scale remobilization (< 1 m) and trace element redistribution.

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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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