The Canadian Malartic gold deposit was produced by a hydrothermal system that altered the host metasedimentary rocks of the Pontiac Group, metavolcanic rocks of the Piché Group, and associated porphyritic intrusions and mafic dykes. The isotopic footprint in Pontiac metasedimentary rocks is marked by an increase in δ2H values from − 91‰ near mineralization to background values of ca. − 59‰, whereas δ18O values remain relatively constant near 10‰. The isotopic footprint in mafic dykes is marked by an increase in δ2H values from − 84‰ near mineralization to background values of ca. − 73‰, and a decrease in δ18O values from 9.8‰ near mineralization to background values of ca. 8.3‰. Kriging of oxygen and hydrogen isotopic compositions around the Canadian Malartic deposit delineates the isotopic footprint of the deposit. In greywackes, the − 59‰ δ2H isopleth encircles the mineralized domain and is elongated towards the northwest and southeast. In mafic dykes, the − 73‰ δ2H isopleth encircles the mineralized domain as well as a large area to the south and southeast, whereas the 8.3‰ δ18O isopleth encircles the center of the mineralized system and extends over an area towards the southeast. Host rock oxygen and hydrogen isotope compositions therefore define a cryptic alteration footprint up to 2.5 km outside of the Canadian Malartic deposit. The isotopic composition of the metamorphic fluid in equilibrium with the average least altered greywacke at upper greenschist to amphibolite conditions of ca. 550 °C is approximately δ18O = 8.6‰ and δ2H = − 19‰. This is close to the composition of the mineralizing fluid at the Canadian Malartic deposit reported by previous studies. Fluid/rock oxygen and hydrogen isotope exchange modeling indicate that the isotopic footprint formed at relatively low fluid/rock ratios up to 0.5 at temperatures near 350–400 °C.

中文翻译：

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加拿大魁北克省庞蒂亚克省加拿大 Malartic 金矿床全岩 δ2H 和 δ18O 足迹

加拿大 Malartic 金矿床是由热液系统产生的，该系统改变了庞蒂亚克群的主变质沉积岩、皮切群的变质火山岩以及相关的斑状侵入体和镁铁质岩脉。庞蒂亚克变质沉积岩中的同位素足迹的特征是 δ2H 值从矿化附近的 - 91‰ 增加到约 10 的背景值。− 59‰，而 δ18O 值在 10‰ 附近保持相对恒定。镁铁质岩脉中的同位素足迹的特点是 δ2H 值从矿化附近的 - 84‰ 增加到约 10 的背景值。− 73‰，δ18O 值从矿化附近的 9.8‰ 降低到大约背景值。8.3‰。加拿大 Malartic 矿床周围氧和氢同位素组成的克里金法描绘了该矿床的同位素足迹。在格雷瓦克斯，− 59‰ δ2H等值线环绕矿化域，向西北和东南方向拉长。在镁铁质岩脉中，-73‰δ2H等值线围绕矿化域以及南部和东南部的大片区域，而8.3‰δ18O等值线围绕矿化系统的中心并向东南延伸。因此，主岩氧和氢同位素组成在加拿大马拉蒂克矿床外 2.5 公里处定义了一个隐蔽的蚀变足迹。变质流体的同位素组成与上绿片岩到角闪岩条件的平均变化最小的灰岩平衡。550 °C 约为 δ18O = 8.6‰ 和 δ2H = − 19‰。这与之前研究报告的加拿大 Malartic 矿床中矿化流体的成分接近。