We investigate the relative and absolute timing associated with the formation of the world-class Dead Bullock Soak (DBS) mining camp. The study area is situated in the Paleoproterozoic Granites-Tanami Gold Province in the Northern Territory, Australia, and consists of five orogenic gold deposits, including the Callie deposit with a resource of 14.2 Moz Au. At DBS, the ore is hosted in Paleoproterozoic metasedimentary rocks and consists of two contrasting styles of mineralization, vein-hosted and stratabound. The vein-hosted mineralization consists of visible gold in quartz, chlorite, carbonate veins preferentially hosted in finely laminated, decarbonized siltstones. In contrast, the stratabound mineralization consists of free gold associated with arsenopyrite concentrated in bedding-parallel sulfide-rich layers, hosted in iron-rich siltstones. This study combines structural and petrographic analysis with detailed U–Pb geochronological data on hydrothermal and metamorphic xenotime and monazite to constrain the relative and isotopic timing of ore formation in the DBS mining camp. The results of this study show that both mineralization styles developed within a series of NE-trending and SE-dipping vein corridors or structural pathways, associated with the development of axial planar fabric related to small-scale F 2 folds. U–Pb geochronology shows that both mineralization styles formed at c. 1805 Ma, approximately 35 m.y. after peak metamorphism at c. 1840 Ma. A post-mineralization hydrothermal event is locally remobilizing gold and yields an age of c. 1790 Ma, which provides a minimum age for gold deposition.

中文翻译：

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澳大利亚世界级 Dead Bullock Soak 矿场同时形成脉状和层状金矿化

我们调查了与世界级 Dead Bullock Soak (DBS) 采矿营地形成相关的相对和绝对时间。研究区位于澳大利亚北领地古元古代花岗岩-塔纳米金矿区，由5个造山带金矿床组成，包括资源量为14.2 Moz Au的Callie金矿床。在 DBS，矿石位于古元古代变沉积岩中，由两种截然不同的矿化类型组成，脉状和层状。脉状矿化由石英、绿泥石、碳酸盐矿脉中的可见金组成，优先存在于细层状脱碳粉砂岩中。相比之下，层控矿化由与砷黄铁矿相关的游离金组成，这些金矿集中在与层理平行的富含硫化物层中，位于富含铁的粉砂岩中。本研究将构造和岩石学分析与关于热液和变质磷钇矿和独居石的详细 U-Pb 年代学数据相结合，以限制 DBS 采矿营地成矿的相对和同位素时间。这项研究的结果表明，这两种矿化类型都在一系列 NE 向和 SE 倾斜的静脉廊道或构造通道内发育，与小尺度 F 2 褶皱相关的轴向平面结构的发育有关。U-Pb 年代学表明两种矿化样式都形成于 c。1805 Ma，大约 35 my 在 c. 1840 年 矿化后的热液事件正在局部重新动员金并产生 c 的年龄。1790 Ma，这提供了金沉积的最小年龄。