Linking Neoproterozoic lode gold provinces to a metasomatized mantle

The Pb isotopes of pyrite indicated a metasomatized lithospheric mantle origin of the gold deposits in the region, which is similar to local mafic dikes. In addition, the gold deposits are strengthened by crustal contamination progressing from south to north of the Huangling area. ... The main ore types are gold-bearing pyrite, with occasional ...

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New theory aims to explain how gold, platinum …

By re-examining conventional wisdom, researchers at Yale University and the Southwest Research Institute have come up with a new theory on how gold and platinum deposits ended up on earth's...

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Gold Ore

i found gold ore in the yeti cave at coords 43,30 above southshore in the alteic mountains above southshore. Comment by Thottbot I've seen gold at the Angerfang Camp Mountain area as well, just above the Excavation site. Comment by Thottbot yea well i have found gold alot on Ashenvale and alot more round Thousand needles.

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Mantle, crustal and atmospheric noble gases in Ailaoshan gold …

Helium and argon isotopic and elemental compositions of fluids released by crushing pyrite grains are reported from the Ailaoshan Gold Province, China. The province is a series of gold deposits hosted on a 200-km segment of a major normal fault formed during Eocene extension. The deposits have been well characterised using conventional geochemical and microthermometric …

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Chronology and Crust‐Mantle Mixing of Ore‐forming …

Combined with the zircon age—Hf isotope correlation diagram, the aforementioned data indicate that the source reservoir might be a region that is mixed with depleted mantle and ancient crust, which possibly contains more materials sourced from depleted mantle. Rock-forming ages and ore-forming ages of the Duolong ore concentrate area are 120 ...

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Gold source and ore-forming process of the Linglong gold …

Pyrite in the Jiaodong gold province can be used to effectively trace the source of ore-forming materials and the ore-forming process because it is the main gold-bearing mineral and developed in the whole metallogenic stage (Li et al., 2018, Tang et al., 2021).Despite the analysis of in-situ elemental and isotopic compositions of pyrite in various deposits within the …

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Mantle-rooted fluid pathways and world-class gold …

Gold exploration accounts for >50% of the world's annual exploration investment, and orogenic gold deposits provide over 50% of the global gold production, making them the most prominent deposit type (Pohl, 2022).Jiaodong is the only known late Mesozoic giant gold province in the world that occurs within a Precambrian metamorphic terrane (Goldfarb and Santosh, …

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Unraveling the Effects of Melt Mantle Interactions on …

Earth's mantle during gold metallogenesis. Our data reveal that an initially reduced silicate melt (1FMQ 2.2 to 1.2) was oxidized to 1FMQ between 0 and 1.2 during ... boosting the potential of the melt to scavenge ore metals such as gold. We suggest that large redox gradients resulting from the interaction between ascending melts and

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Fluid origin and critical ore-forming processes for the giant gold …

The Jiaodong Peninsula is the largest gold province in China (Fig. 1), which hosts over 100 gold deposits with more than 5000 t of gold within an area of less than 30,000 km 2 (Deng et al., 2020). The gold deposits are fault-controlled, most of which occur along the NE- to NEE-trending faults.

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Study identifies how gold reaches Earth's surface

A research team including a University of Michigan scientist has discovered a new gold-sulfur complex that helps researchers understand how gold deposits are formed. Gold in ore deposits associated with volcanoes around the Pacific Ring of Fire originates in Earth's mantle and is transported by magma to its surface.

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Crust-mantle structures and gold enrichment mechanism of …

Gold enrichment mechanism of ore-forming fluid is the essence of gold metallization. This paper summarizes the distinguishing symbols of mantle fluid and effect of crust-mantle structure on …

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Spatial coupling relationship between faults and gold …

Gold ore bodies in the Jiaodong Peninsula occur inside or on the periphery of Mesozoic granite. Strong magmatic activities during the transition from enriched to depleted mantle provided the necessary metallogenic and thermal dynamic environment for gold mineralisation. ... 2016), strongly support that the change of Cretaceous mantle properties ...

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Evidence of mantle-rooted fluids and multi-level …

the mantle-rooted fluids had involved in ore-forming processes[6]. In the area, basic rocks widely ... Their similar occurrences and continuous change of chemical ... researchers have three different points on the ore-forming fluids of the Xiadian gold deposit: (1) mixed fluids (including meteoric water, metamorphic and magmatic hydrother- ...

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Mantle oxidation by sulfur drives the formation of giant gold …

Oxidation of the sub-arc mantle driven by slab-derived fluids has been hypothesized to contribute to the formation of gold deposits in magmatic arc environments that host the majority of metal resources on Earth. However, the mechanism by which the infiltration of slab-derived fluids into the mantle …

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Study sheds light on how gold reaches the Earth's …

In a nutshell, when gold in the mantle is exposed to a fluid containing sulfur, the gold bonds to the sulfur molecules, creating a gold-trisulfur complex. This compound is highly mobile in...

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Mantle-derived gold scavenged by bismuth-(tellurium)-rich …

Numerous Mesozoic gold deposits are widely distributed in the North China Craton (NCC) with total Au reserves of over 5000 tons (Zhu et al., 2015) (Fig. 1), making up a unique giant gold province in the ancient craton.These gold deposits formed coincidently with large-scale craton destruction in Mesozoic (Li et al., 2012a), nearly 1800 Myrs later than the final …

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The role of an oxidized lithospheric mantle in gold mobilization

Phanerozoic orogenic gold mineralization at craton margins is related to the metasomatism of the lithospheric mantle by crustal material. Slab subduction transfers Au from …

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The Genesis Mechanism of the Mantle Fluid Action and …

@article{Xianfan2012TheGM, title={The Genesis Mechanism of the Mantle Fluid Action and Evolution in the Ore‐Forming Process: A Case Study of the Laowangzhai Gold Deposit in Yunnan, China}, author={Liu Xianfan and Li Chunhui and Lu Qiuxia and Deng Biping and Song Xiangfeng and Zhao Fufeng and Chu Yating and Xiao Jixiong and Yi Liwen and Huang ...

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Unraveling the Effects of Melt Mantle Interactions on …

Earth's mantle during gold metallogenesis. Our data reveal that an initially reduced silicate melt (1FMQ 2.2 to 1.2) was oxidized to 1FMQ between 0 and 1.2 during ... apatite, XANES, gold, ore deposits Frontiers in Earth Science| 1 February2020|Volume 8|Article 29. feart-08-00029 February 8, 2020 Time: 12:31 # 2 Tassara et ...

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Environmental Science chapter 12 Flashcards

Study with Quizlet and memorize flashcards containing terms like Gold ore can be removed ore with a highly toxic chemical called cyanide through series of leaching operations., What kind of movement does the heat within the core and mantle direly generate?, The location of plate boundaries is most helpful is predicting the. and more.

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UMich study uncovers the mechanism behind gold deposit …

These zones create processes that concentrate minerals into ore deposits. High-temperature, water-based hydrothermal fluids play a role in forming these deposits, including …

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Mantle oxidation by sulfur drives the formation of giant gold …

Oxidation of the sub-arc mantle driven by slab-derived fluids has been hypothesized to contribute to the formation of gold deposits in magmatic arc environments that host the majority of metal resources on Earth. However, the mechanism by which the infiltration of slab-derived fluids into the mantle wedge changes its oxidation state and affects Au enrichment remains poorly …

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The gold mineral systems of the West Qinling orogen, …

The consistency of ore-forming material sources and initial ore-forming fluid components, and the differences in geological factors such as ore body emplacement depth and structure led to the diversity of ore types, ore mineral assemblages and ore-forming element assemblages of gold deposits in the orogenic, which constituted a giant orogenic ...

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Evidence of mantle-rooted fluids and multi-level circulation ore …

Metallogensis of the Xiadian gold deposit in Shandong Province has been a question under dispute for a long time. There are many points such as metamorphic hydrothermal, magamatic hydrothermal and meteoric water. ... Detailed study shows that mantle-rooted fluids were involved in the ore-forming processes. Evidence for this argumentation comes ...

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Mantle Oxidation, Sulfur Speciation, and the Genesis of Giant …

Overall, this study demonstrates that mantle oxidation by S–bearing aqueous fluids is a key trigger mechanism for gold enrichment, with the trisulfur radical ion (S3-) playing …

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Study identifies how gold reaches Earth's surface

Gold in ore deposits associated with volcanoes around the Pacific Ring of Fire originates in Earth's mantle and is transported by magma to its surface. But how that gold is …

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Ore-forming fluid characteristics of Jiaodong-type gold …

The Early Cretaceous gold deposits in the North China Craton are known as Jiaodong-type gold deposits. Here, we summarize a quantity of reported (including this study) pyrite trace element, δ34S, and Pb isotope data from the Jiaodong, Xiaoqinling, and Central Taihangshan gold fields to comprehensively reveal the characteristics of the ore-forming fluids …

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Rapid Tectonic Transition, Crust-Mantle Interaction And Gold

Lithospheric delamination at ca. 120 Ma triggered upwelling of enriched lithospheric mantle–derived melts, which migrated massive volatiles and ore–forming materials along fractures to shallow crustal levels, and crust–mantle interactions may further enriched gold metal.

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Chronology and Crust‐Mantle Mixing of Ore

The Naruo porphyry copper‐gold deposit (hereinafter referred to as the Naruo deposit) in Tibet is a potentially ultra‐large, typical gold‐rich porphyry copper deposit, which was recently discovered in the Bangongco‐Nujiang metallogenic belt. This study analyzed U‐Pb chronology and Hf isotopes of the ore‐bearing granodiorite porphyry in the Naruo deposit using …

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Gold in the mantle: A global assessment of abundance

Gold has been one of the least studied elements in the mantle. There are several reasons for this, including the very low levels of Au in the mantle, making analysis difficult, and the mono-isotopic nature of Au, which makes isotope dilution, the technique commonly used to analyse the geochemically similar platinum group elements (PGE), impossible.

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Earth's Gold-Mining Machine | Evolution News

The next question they looked at was how this change in oxidation affects the movement of gold. As the mantle becomes oxidized by these fluids, the sulfur species change from reduced forms such as HS – and H 2 S to more oxidized forms such as SO 4 2-.

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Deciphering ore-forming fluid evolution processes of the Yuerya gold

Sulfides are ubiquitous in various metal deposits and are usually important carriers of useful metal elements (Jean and Michael, 1985, Hyland and Bancroft, 1989, Maddox et al., 1998, Abraitis et al., 2004, Deditius et al., 2008, Prol-Ledesma et al., 2010).Pyrite, the primary sulfide mineral in gold deposits, also serves as the principal carrier of gold, with approximately …

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