Evidence for iron-rich sulfate melt during magnetite(-apatite) mineralization at El Laco, Chile

被引：31

作者：

Bain, Wyatt M. ^{[1
]}

Steele-MacInnis, Matthew ^{[1
]}

Tornos, Fernando ^{[2
,3
]}

Hanchar, John M. ^{[3
]}

Creaser, Emily C. ^{[1
]}

Pietruszka, Dorota K. ^{[3
]}

机构：

[1] Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada

[2] CSIC UCM, Inst Geociencias IGEO, Dr Severo Ochoa 7, Madrid 28040, Spain

[3] Mem Univ Newfoundland, Dept Earth Sci, St John, NF A1B 3X5, Canada

来源：

GEOLOGY | 2021年 / 49卷 / 09期

基金：

加拿大自然科学与工程研究理事会;

关键词：

FLUID INCLUSIONS; KIRUNA-TYPE; NORTHERN CHILE; ORIGIN; VOLCANO; ISOTOPE; SYSTEM; ORE; CARBONATE; EVOLUTION;

D O I：

10.1130/G48861.1

中图分类号：

P5 [地质学];

学科分类号：

0709 ; 081803 ;

摘要：

The origins of Kiruna-type magnetite(-apatite) [Mt(-Ap)] deposits are contentious, with existing models ranging from purely hydrothermal to orthomagmatic end members. Here, we evaluate the compositions of fluids that formed the classic yet enigmatic Mt(-Ap) deposit at El Laco, northern Chile. We report evidence that ore-stage minerals crystallized from an Fe-rich (6-17 wt% Fe) sulfate melt. We suggest that a major component of the liquid was derived from assimilation of evaporite-bearing sedimentary rocks during emplacement of andesitic magma at depth. Hence, we argue that assimilation of evaporite-bearing sedimentary strata played a key role in the formation of El Laco and likely Mt(-Ap) deposits elsewhere.

引用

页码：1044 / 1048

页数：5

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