The Snow Lake camp is located in the ca. 1.89 Ga Flin Flon-Glennie Complex in the Paleoproterozoic Trans-Hudson orogen, Manitoba, Canada. The Flin Flon-Glennie Complex is bordered by the ca. 1.855 to 1.84 Ga metasedimentary Kisseynew domain to the north and by the Archean Superior craton to the east and is underlain by the Archean Sask microcraton. It hosts several orogenic gold deposits, including the No. 3 zone, Boundary zone, and New Britannia deposit (Toots, Dick, Hogg, Ruttan, and Mine East zones), which formed during thrusting of the Flin Flon-Glennie Complex and Kisseynew domain over the Sask microcraton. The New Britannia deposit produced 1.6 Moz Au and is the largest orogenic gold deposit in the Trans-Hudson orogen in Manitoba. The deposits consist of quartz ± carbonate veins surrounded by alteration zones of biotite, hornblende, plagioclase ± carbonate, diopside, orthoclase, and garnet. The veins and ore zones are folded within the hinge of the synthrusting Nor-Acme anticline, which has an axial plane cleavage defined by biotite and hornblende, but they also cut across the hinge of the anticline and contain foliated fragments of the wall rocks. These mutually overprinting relationships suggest that the veins and ore zones are synfolding. Garnet, diopside, and amphibole porphyroblasts grew during folding because they overgrow the foliation, which also wraps around them. Inclusions of gold and sulfide minerals within the porphyroblasts indicate that mineralization was emplaced early during folding at greenschist or lower amphibolite metamorphic conditions prior to the growth of the porphyroblasts at peak middle amphibolite metamorphic conditions. These observations are corroborated by laser ablation-inductively coupled plasma-mass spectrometry element maps of arsenopyrite grains. These maps reveal a primary internal enrichment of gold in arsenopyrite grains from the Toots, No. 3, and Boundary zones and a lack of primary lattice-bound gold in arsenopyrite grains of the Dick, Ruttan, and Mine East zones. The latter results from the deposition or remobilization of gold during a second hydrothermal event that occurred during shearing of these ore zones along a structure, the Howe Sound fault, which acted as a detachment surface during folding. The Snow Lake deposits are examples of orogenic gold deposits that formed early during a major thrusting and folding event and were later modified and metamorphosed at middle amphibolite facies conditions during the same progressive orogenic event.

中文翻译：

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加拿大马尼托巴省的雪湖矿床：渐进和渐进造山事件期间变质角闪岩相造山金矿床的形成

雪湖营地位于约。1.89 Ga Flin Flon-Glennie 杂岩，位于加拿大马尼托巴省古元古代跨哈德逊造山带。弗林弗伦-格伦尼综合体 (Flin Flon-Glennie Complex) 毗邻约。北部为 1.855 至 1.84 Ga 变沉积基西纽域，东部为太古代超克拉通，其下方为太古代萨斯克微克拉通。它拥有多个造山金矿床，包括 3 号带、边界带和新不列颠尼亚矿床（Toots、Dick、Hogg、Ruttan 和 Mine East 区域），这些金矿床是在 Flin Flon-Glennie 杂岩和 Kisseynew 域的逆冲过程中形成的萨斯克微克拉通上空。新不列颠尼亚矿床产出了 1.6 Moz Au，是马尼托巴省 Trans-Hudson 造山带最大的造山金矿床。矿床由石英±碳酸盐脉组成，周围环绕着黑云母、角闪石、斜长石±碳酸盐、透辉石、正长石和石榴石的蚀变带。矿脉和矿带折叠在合成 Nor-Acme 背斜的铰链内，该背斜具有由黑云母和角闪石限定的轴向平面解理，但它们也穿过背斜的铰链并包含围岩的叶状碎片。这些相互叠印的关系表明矿脉和矿带是同折叠的。石榴石、透辉石和角闪石原卟啉细胞在折叠过程中生长，因为它们的叶状结构过度生长，而叶状结构也包裹着它们。成斑岩内的金和硫化物矿物包裹体表明，在绿片岩或下角闪岩变质条件下的折叠过程中，早于成斑岩在中角闪岩变质峰值条件下生长之前，矿化就已形成。这些观察结果得到毒砂颗粒激光烧蚀-电感耦合等离子体质谱元素图的证实。这些地图揭示了来自 Toots、No. 3 和 Boundary 区域的毒砂颗粒中金的初级内部富集，以及来自 Dick、Ruttan 和 Mine East 区域的毒砂颗粒中缺乏初级晶格束缚金。后者是由于第二次热液事件期间金的沉积或再活动造成的，该热液事件发生在沿豪湾断层结构剪切这些矿带期间，该断层在折叠过程中充当分离面。Snow Lake 矿床是造山金矿床的例子，这些矿床在主要的逆冲和褶皱事件期间形成，后来在同一渐进造山事件期间在中角闪岩相条件下发生改造和变质。