Magma mixing and gold mineralization in the Maevatanana gold deposit, Madagascar

Yang, Xian; Li, Chao; Hou, Kejun; Li, Guang-rong; Liu, Jiajun

doi:10.1016/j.oregeorev.2017.08.006

Cited by 4 publications

(1 citation statement)

References 75 publications

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“…Furthermore, the mixing and mingling processes involving crustal-and mantle-derived magma may contribute to the formation of endogenetic metal deposits, especially gold deposits [10,12,13]. The Early Cretaceous granitic plutons enclosing MMEs formed by magma mixing and mingling, such as the Guojialing and Weideshan granitic intrusions, may be associated with gold deposits in the Jiaodong Peninsula in the eastern NCC [10].…”

Section: Introductionmentioning

confidence: 99%

The Early Cretaceous Granitoids and Microgranular Mafic Enclaves of Sanguliu Pluton, the Liaodong Peninsula: Implications for Magma Mixing and Decratonic Gold Mineralization in the Eastern North China Craton

Chen

et al. 2022

Minerals

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Some Early Cretaceous granitoids characterized by abundant mafic microgranular enclaves (MMEs) formed by magma mixing have been associated with gold deposits in the eastern North China Craton (NCC). However, the genetic connection of magma mixing with gold mineralization remains unclear. The zircon U–Pb ages and in situ Lu-Hf isotopic compositions, whole-rock major- and trace-element and Sr–Nd–Pb isotopic compositions, as well as EPMA biotite compositions, were presented for the Sanguliu granodiorite and enclaves in the Liaodong Peninsula in order to obtain insights into the spatial and temporal distribution, and internal connection of magma mixing with the decratonic gold deposits in the eastern NCC. The Sanguliu granodiorite yielded coeval formation ages with the enclaves (~123 Ma), and their acicular apatites and plagioclase megacrysts suggest that the enclaves were formed by mixing between mafic and felsic magmas. Geochemically, the Sanguliu granodiorite is high-K calc-alkaline I-type granite, with an initial 87Sr/86Sr ratio of 0.70552 to 0.71470 and strongly negative εNd(t) (−11.4 to −21.3) and zircon in situ εHf(t) values (−15.1 to −25.4), indicating that the felsic magmas were ancient lower crust with the involvement of mantle-derived materials. Meanwhile, the enclaves have high MgO (4.18 to 6.17 wt.%), Cr (45.91 to 290.04 ppm), and Ni (19.65 to 88.18 ppm) contents, with high Mg# values of 50 to 57 at intermediate SiO2 contents (53.68 to 55.78 wt.%), highly negative εNd(t) values (mostly −18.42 to −22.03), and in situ zircon εHf(t) values (−18.6 to −22.7), indicating that the mafic magma was mainly derived from the enriched lithospheric mantle. Furthermore, the biotites from the Sanguliu granodiorite clustered between the MH and NNO buffers in the Fe2+–Fe3+–Mg diagram. This, combined with the high Ce/Ce* ratios (1.30 to 107.18) of the zircons, indicates that the primary magmas forming the Sanguliu granodiorite had a high oxygen fugacity, which is favorable for gold mineralization. These findings, together with previous studies of the Early Cretaceous granitoids with enclaves in the eastern NCC, suggest that magma mixing commonly occurred during 110–130 Ma and is temporally, spatially, and genetically related to decratonic gold systems in eastern NCC.

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Section: Introductionmentioning

confidence: 99%

The Early Cretaceous Granitoids and Microgranular Mafic Enclaves of Sanguliu Pluton, the Liaodong Peninsula: Implications for Magma Mixing and Decratonic Gold Mineralization in the Eastern North China Craton

Chen

et al. 2022

Minerals

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Gold mineralization assisted by crustal melting: the case of the Maevatanana mesothermal gold deposit, Madagascar

Yang

Carranza

et al. 2019

Arab J Geosci

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Barren ground depressions, natural H2 and orogenic gold deposits: Spatial link and geochemical model

Malvoisin

Brunet

2023

Science of The Total Environment

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Magma mixing and gold mineralization in the Maevatanana gold deposit, Madagascar

Cited by 4 publications

References 75 publications

The Early Cretaceous Granitoids and Microgranular Mafic Enclaves of Sanguliu Pluton, the Liaodong Peninsula: Implications for Magma Mixing and Decratonic Gold Mineralization in the Eastern North China Craton

The Early Cretaceous Granitoids and Microgranular Mafic Enclaves of Sanguliu Pluton, the Liaodong Peninsula: Implications for Magma Mixing and Decratonic Gold Mineralization in the Eastern North China Craton

Gold mineralization assisted by crustal melting: the case of the Maevatanana mesothermal gold deposit, Madagascar

Barren ground depressions, natural H2 and orogenic gold deposits: Spatial link and geochemical model

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