Calcite trace element geochemistry of Au deposits in the Singu-Tabeikkyin Gold District, Myanmar: Implications for the sources of ore-forming fluids

Myint, Aung Zaw; Wagner, Thomas; Fußwinkel, Tobias

doi:10.1016/j.oregeorev.2022.104892

Cited by 8 publications

(6 citation statements)

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“…However, all three types of calcites studied were depleted in LREE and enriched in MREE (Figure 4), consistent with the REE patterns of ore-stage calcites from other CTDs (e.g., Shuiyindong, Zhesang, Zimudang) in the Nanpanjiang basin [24,25]. The REE pattern of calcite is influenced by co-precipitated minerals, Fe-Mn contents, and the hydrothermal fluid composition [19,54]. The co-precipitated minerals with calcites at the Lannigou mainly include quartz, arsenian pyrite, arsenopyrite, realgar, and orpiment (Figure 3), none of which are major REE carriers.…”

Section: Fluid Nature and Sources Responsible For The Precipitation O...supporting

confidence: 79%

“…The Lannigou gold deposit is hosted in Triassic siliciclastic rocks; hydrothermal fluid inevitably reacted with those country rocks. The breakdown of plagioclase in clastic country rocks in response to the interaction with hydrothermal fluid could represent a dominant mechanism underlying our observed positive Eu normally in Cal-1 and Cal-2 [19]. In contrast, Cal-3 exhibits slightly negative Eu anomalies, which may reflect limited fluid-rock interactions.…”

Section: Fluid Nature and Sources Responsible For The Precipitation O...mentioning

confidence: 75%

“…The three types of calcites had δ 13 C variations of −4.4 to 0.9‰, well within the range of marine carbonates (Fi Hence, the carbon in calcites primarily originated from regional Paleozoic mar The REE patterns of calcite can indicate fluid sources [57,58]. The three types of calcites from the Lannigou gold deposit exhibited MREE-enriched patterns (Figure 4), inconsistent with the calcites formed in magmatic-hydrothermal environments (e.g., skarn and carbonatite deposits), which are typically enriched in LREE [19,20]. However, the three calcite sample types were comparable to the LREE-depleted patterns in orogenic-style gold deposits [59], implying that our studied calcites may precipitate from metamorphic-related fluid.…”

Section: Fluid Nature and Sources Responsible For The Precipitation O...mentioning

confidence: 87%

“…Calcite is a common mineral in hydrothermal deposits; its elemental and isotopic compositions record a wealth of information regarding fluid sources and evolution [18][19][20]. Moreover, Sm-Nd geochronology can be applied to constrain the timing of hydrothermal events [21][22][23].…”

Section: Peer Review 2 Of 17mentioning

confidence: 99%

“…Calcite is a common mineral in hydrothermal deposits; its elemental and isotopic compositions record a wealth of information regarding fluid sources and evolution [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Multi-Phase Hydrothermal Fluid Events in the Giant Lannigou Gold Deposit, SW China: Insights from Calcite Sm–Nd Age, Trace Elements, and C-O-Sr Isotopes

Li,

Hu,

Tian

et al. 2023

Minerals

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The Nanpanjiang basin hosts the world’s second-largest concentration of Carlin-type gold deposits. To decipher the origin and evolution of hydrothermal fluid, this study conducted Sm–Nd dating, in-situ trace element, and C-O-Sr isotopic analyses on three types of calcite samples from the giant Lannigou gold deposit in the Nanpanjiang basin, SW China. The type-I calcite, intergrown with Au-bearing arsenian pyrite, has an Sm–Nd isochron age of 213 ± 7 Ma (MSWD = 0.81), indicating that gold mineralization occurred in Late Triassic. The type-II calcite, which coexists with high-maturity bitumens and cut through the main-stage gold orebodies, yields an Sm–Nd age of 188 ± 14 Ma (MSWD = 0.34), representing a post-ore hydrocarbon accumulation event. The type-I and type-II calcite samples have low REE contents (5.28–51.6 ppm) and exhibit MREE-enriched and LREE-/HREE-depleted patterns. Combined with their identical C-O-Sr isotopes, we suggest that hydrothermal fluids responsible for the precipitation of type-I and type-II calcite samples were derived from a mixed metamorphic fluid and meteoric water source. In contrast, the type-III calcite samples, associated with realgar and orpiment, have distinct Mn, Sr, and As contents, REE patterns, and C-O-Sr isotopic composition from the type-I and II calcites, suggestive of different fluid sources. Based on our and previously published data, we propose that the fluid evolution, gold mineralization, and hydrocarbon accumulation in the Nanpanjiang basin are closely related to the Indosinian and Yanshanian orogenies in South China.

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Section: Fluid Nature and Sources Responsible For The Precipitation O...supporting

confidence: 79%

Section: Fluid Nature and Sources Responsible For The Precipitation O...mentioning

confidence: 75%

Section: Fluid Nature and Sources Responsible For The Precipitation O...mentioning

confidence: 87%

Section: Peer Review 2 Of 17mentioning

confidence: 99%

“…Calcite is a common mineral in hydrothermal deposits; its elemental and isotopic compositions record a wealth of information regarding fluid sources and evolution [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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