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• W2913005539 endingPage "214" @default.
• W2913005539 startingPage "200" @default.
• W2913005539 abstract "Apatite as an excellent tracer of the magmatic and metallogenic processes, can incorporate large amounts of trace elements sensitive to melting and/or ore-fluid evolution. This paper reports a combined study of in situ apatite geochemistry and whole-rock geochemistry for Early Cretaceous ore-bearing (Group I) and ore-barren porphyries (Group II) in the Liguo Fe-Cu-Au deposit for the deciphering of its petrogenesis and the control factors of mineralization. The apatite from both Group I and Group II is magmatic fluorapatite, characterized by Eu negative anomalies, an enrichment of LREEs, and a depletion of HREEs. Meanwhile, both groups have high Sr/Y and delta Eu, indicating porphyry adakitic characteristics in origin. Compared to isotopes of whole rocks, the variable Sr-87/Sr-86 (0.70250-0.71262) and delta O-18 (6.22-9.00) values of both groups of apatite imply contributions of mantle-, crust- and/or sediment-derived materials. Although Group I apatite and II apatite show some similar geochemical characteristics, Group I apatite precedes the crystallization of plagioclase with no Sr-(La/Yb)(N)/(La/ Sm)(N)/(Sm/Yb)(N) correlations, whereas Group II apatite coincides with plagioclase crystallization, displaying positive correlations. The geochemistry of the elements (delta Eu, delta Ce, MnO and V) of these apatite groups, which are sensitive to a redox state, shows high oxygen fugacity (between HM and NNO), and Group I apatite has systematically higher oxygen fugacity than Group II apatite. More importantly, these different trace elements and oxygen fugacity characteristics between Group I apatite and Group II apatite can be used as an indicator of mineralization, and allow the skarn Fe-Cu-Au mineralization range to be drawn for the first time. Furthermore, the estimated F and Cl contents of the host parent magma (F = 1300-2446 ppm, Cl = 140-4780 ppm) are higher than those in a primitive mantle and average continental crust, suggesting an enrichment process of F and Cl. According to the above adakitic characteristics, high oxygen fugacity, and high F and Cl contents, the Pacific Plate subduction may be the main dynamic mechanism of the diagenesis and mineralization found in Liguo." @default.
• W2913005539 created "2019-02-21" @default.
• W2913005539 creator A5007397610 @default.
• W2913005539 creator A5008199435 @default.
• W2913005539 creator A5019397663 @default.
• W2913005539 creator A5025768990 @default.
• W2913005539 creator A5042943723 @default.
• W2913005539 creator A5060844794 @default.
• W2913005539 creator A5074329137 @default.
• W2913005539 date "2019-04-01" @default.
• W2913005539 modified "2023-10-16" @default.
• W2913005539 title "In situ elemental and Sr-O isotopic studies on apatite from the Xu-Huai intrusion at the southern margin of the North China Craton: Implications for petrogenesis and metallogeny" @default.
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