Abstract The Magino gold deposit, located within the Michipicoten greenstone belt of the Wawa subprovince (Ontario, Canada), is a past-producing underground mine which has recently begun production as an open-pit gold mine with 4.5 Moz of Au in resources. Gold is primarily hosted within the ca. 2724 Ma Webb Lake stock, a steeply dipping, tabular, multiphase tonalitic intrusion oriented parallel to the penetrative regional S2 foliation along the Goudreau Lake deformation zone. The Magino deposit underwent two gold mineralization events (Au1, Au2) and three ductile deformation events (D2, D3, D4). The main gold event (Au1) is expressed by pervasive biotitic/phengitic alteration of the stock and the emplacement of auriferous sugary quartz veins. The veins have a molybdenite Re-Os age of 2731 ± 6.9 Ma, which is indistinguishable from that of the host Webb Lake stock. Quartz-feldspar porphyry dikes cogenetic with the Webb Lake stock cut across the veins and are transposed, stretched, and folded parallel to the S2 foliation within high-strain corridors in the stock, supporting a pre-D2 timing for the Au1 event. These D2 high-strain corridors formed during localization of deformation along Au1 hydrothermally altered zones. The Au2 event occurred during the D2 event and is associated with the emplacement of N-trending quartz-tourmaline-carbonate veins with albitic alteration selvages, which were later deformed during D3 dextral reactivation of the high-strain corridors. Later D4 vertical loading produced a subhorizontal crenulation cleavage, which is overprinted by chloritoid porphyroblasts that grew during late upper greenschist facies peak metamorphism. The Magino deposit is an example of an Archean intrusion-related gold system, which was structurally modified and overprinted by a syndeformation epigenetic gold mineralization event and late metamorphism.

Ian C. Campos

Bruno Lafrance

Ross Sherlock

Paul Dunbar

Blake Mclaughlin

Stefan Kruse

Robert Creaser

Derek D.V. Leung

Economic Geology

该杂志现为半季刊，由经济地质出版公司 (PUBCO) 于 1905 年首次出版，该公司是一家非营利性公司，旨在出版经济地质学期刊。 1920 年 SEG 成立时，PUBCO 和 SEG 之间的合作安排使该杂志成为该学会的官方机构，PUBCO 同意在封面上的“经济地质学家学会公报”标题下使用该学会的名称”。PUBCO 和 SEG 继续作为合作但独立的实体运营，直到 2001 年 PUBCO 董事会和 SEG 理事会一致同意批准正式的合并协议。PUBCO 董事会以前的活动是现在由出版委员会执行，这是 SEG 内的一个新的自治单位。

Economic Geology is a semi-annual journal first published by the Economic Geology Publishing Company (PUBCO) in 1905. PUBCO is a non-profit organization dedicated to publishing in the field of economic geology. In 1920, with the establishment of SEG, a collaborative arrangement between PUBCO and SEG made Economic Geology the official journal of the society, with PUBCO agreeing to use the title "Bulletin of the Society of Economic Geologists" on the cover. Since then, PUBCO and SEG have operated as collaborative yet independent entities until 2001, when the boards of PUBCO and SEG unanimously agreed to a formal merger. The functions previously held by the PUBCO board are now executed by the new autonomous unit within SEG known as the Publishing Committee.

《Economic Geology》是一本由经济地质出版公司（PUBCO）于1905年首次出版的半季刊。PUBCO是一家非营利性机构，专注于经济地质学领域的出版。1920年，随着SEG的成立，PUBCO与SEG之间建立了合作关系，使《Economic Geology》成为SEG的官方期刊。PUBCO同意在封面上使用“经济地质学家学会公报”的标题。自那时起，PUBCO和SEG作为合作但独立的实体继续运营，直到2001年，PUBCO董事会和SEG理事会一致同意正式合并。PUBCO董事会以前的职能现在由SEG内部的新自治单位——出版委员会执行。

Category	Quartile
地球科学	1
地球科学, 地球化学与地球物理	1
地球科学, 矿物学	1

The Magino Gold Deposit, Ontario, Canada: An Overprinted Archean Intrusion-Related Gold Deposit

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