Hydrothermal apatite as a robust U–Th–Pb chronometer for the Carlin-type gold deposits in the Youjiang basin, SW China

Gao, Wei; Rui-zhong, HU; Huang, Yong; Zhu, Junjiang; Li, Qiuli; Lu, Mengji; Bi, Xian‐Wu; Liu, Jianzhong

doi:10.1007/s00126-023-01196-6

Cited by 7 publications

(2 citation statements)

References 92 publications

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“…It is located on the eastern flank of the NNE-trending Laizhishan anticline in the northern portion of the Nanpanjiang basin (Figure 2). The exposed strata in the ore district comprise Upper Carboniferous to Permian thick-bedded carbonate rocks (e.g., limestone, dolomitic limestone, bioclastic limestone, and reef limestone) and Triassic terrigenous clastic rocks, which from the bottom to the top include the Xuman, Niluo, Bianyang, and Luolou formations [7,26,34]. Gold mineralization is mainly hosted in the third and fourth subunits of the fourth Middle Triassic Xuman Formation (T 2 xm 4-3 and T 2 xm 4-4 ) unit and the Middle Triassic Bianyang Formation (T 2 by) (Figure 2).…”

Section: Ore Deposit Geologymentioning

confidence: 99%

“…The Dian-Qian-Gui region is the world's second-largest CTD district (Figure 1), containing more than 200 gold deposits or occurrences with >800 tons of total proven Au reserves [3]. Recently, significant progress has been made in the metallogenic age [4][5][6][7], source of ore-forming materials [8][9][10][11], and metallogenic regularity [12][13][14] of these deposits. However, the nature and origin of oreforming fluid for these deposits are highly debated [15][16][17], significantly hampering our understanding of the ore genesis of these deposits.…”

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: Ore Deposit Geologymentioning

confidence: 99%