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

共 36 条

[11] KIRUNA-TYPE DEPOSITS - THEIR ORIGIN AND RELATIONSHIP TO INTERMEDIATE SUBVOLCANIC PLUTONS IN THE GREAT BEAR MAGMATIC ZONE, NORTHWEST CANADA [J].

HILDEBRAND, RS .

ECONOMIC GEOLOGY, 1986, 81 (03) :640-659

[12] Giant Kiruna-type deposits form by efficient flotation of magmatic magnetite suspensions [J].

Knipping, Jaayke L. ;

Bilenker, Laura D. ;

Simon, Adam C. ;

Reich, Martin ;

Barra, Fernando ;

Deditius, Artur P. ;

Lundstrom, Craig ;

Bindeman, Ilya ;

Munizaga, Rodrigo .

GEOLOGY, 2015, 43 (07) :591-594

[13]

Lovering D.G., 1982, MOLTEN SALT TECHNOLO, DOI [10.1007/978-1-4757-1724-2, DOI 10.1007/978-1-4757-1724-2]

[14] Sedimentary aspects and paleoenvironmental evolution of a rift basin: Salta Group (Cretaceous-Paleogene), northwestern Argentina [J].

Marquillas, RA ;

del Papa, C ;

Sabino, IF .

INTERNATIONAL JOURNAL OF EARTH SCIENCES, 2005, 94 (01) :94-113

[15] BUFFERING OF MELT OXYGEN FUGACITY BY SULFUR REDOX REACTIONS IN CALC-ALKALINE MAGMAS [J].

MATTHEWS, SJ ;

JONES, AP ;

BEARD, AD .

JOURNAL OF THE GEOLOGICAL SOCIETY, 1994, 151 :815-823

[16] Active skarn formation beneath Lascar Volcano, northern Chile: A petrographic and geochemical study of xenoliths in eruption products [J].

Matthews, SJ ;

Marquillas, RA ;

Kemp, AJ ;

Grange, FK ;

Gardeweg, MC .

JOURNAL OF METAMORPHIC GEOLOGY, 1996, 14 (04) :509-530

[17] HYDROGEN MOVEMENT INTO AND OUT OF FLUID INCLUSIONS IN QUARTZ - EXPERIMENTAL-EVIDENCE AND GEOLOGIC IMPLICATIONS [J].

MAVROGENES, JA ;

BODNAR, RJ .

GEOCHIMICA ET COSMOCHIMICA ACTA, 1994, 58 (01) :141-148

[18] Immiscible shoshonitic and Fe-P-oxide melts preserved in unconsolidated tephra at El Laco volcano, Chile [J].

Mungall, J. E. ;

Long, K. ;

Brenan, J. M. ;

Smythe, D. ;

Naslund, H. R. .

GEOLOGY, 2018, 46 (03) :255-258

[19] Subvolcanic contact metasomatism at El Laco Volcanic Complex, Central Andes [J].

Naranjo, Jose A. ;

Henriquez, Fernando ;

Nystrom, Jan O. .

ANDEAN GEOLOGY, 2010, 37 (01) :110-120

[20]

Naslund H.R., 2002, HYDROTHERMAL IRON OX, V2, P207

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