The links between the adakitic rocks and Cu-Au mineralization have long been argued.This study investigates petrogenesis and its link to mineralization potential by a series of in-situ geochronological and geochemical...The links between the adakitic rocks and Cu-Au mineralization have long been argued.This study investigates petrogenesis and its link to mineralization potential by a series of in-situ geochronological and geochemical signatures of apatite and zircon in three ore-related intrusions and one-barren intrusion in the Middle-Lower Yangtze River Metallogenic Belt(MLYRB).Zircon U-Pb dating yield ages of 139–143 Ma and 121 Ma for the ore-related and ore-barren intrusions,respectively.The ore-related rocks have higher apatite Sr/Y(1.57–9.69),(La/Yb)_(N)(16.7–159.5),andδEu(0.45–0.74)than the ore-barren rocks of 0.57–1.02,19.3–24.1 and 0.40–0.45,respectively,indicating the former has an adakitic affinity,while the latter has a non-adakitic affinity.The ore-related rocks have enriched zircon Hf isotopes withε_(Hf)(t)values of-15.9 to-5.5 and T_(DMC)ages of 2408–1655 Ma and apatite Sr-Nd isotopes,indicating that the ore-related magmas were mainly originated from partial melting of subducted oceanic crust.The orebarren rocks have higherε_(Hf)(t)values of-6.6 to-4.6 and lower T_(DMC)ages of 1598–1469 Ma and apatite Sr-Nd isotopes,indicating a lithospheric mantle source.The ore-related rocks have higher oxygen fugacity of mean∆FMQ+2.00 and X_(F)/X_(OH)of 8.36–175 than the ore-barren rocks of mean∆FMQ+1.43 and3.72–4.96.It was inferred that magma source,water content,and oxygen fugacity emerge as critical factors governing the regional Cu-Au mineralization potential.展开更多
基金supported by the National Natural Science Foundation of China(42472117)the China Geological Survey Project(DD20230040)+1 种基金the Natural Science Foundation of Anhui Province(2108085MD133)the PI Project of Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou)(GML2020GD0802)。
文摘The links between the adakitic rocks and Cu-Au mineralization have long been argued.This study investigates petrogenesis and its link to mineralization potential by a series of in-situ geochronological and geochemical signatures of apatite and zircon in three ore-related intrusions and one-barren intrusion in the Middle-Lower Yangtze River Metallogenic Belt(MLYRB).Zircon U-Pb dating yield ages of 139–143 Ma and 121 Ma for the ore-related and ore-barren intrusions,respectively.The ore-related rocks have higher apatite Sr/Y(1.57–9.69),(La/Yb)_(N)(16.7–159.5),andδEu(0.45–0.74)than the ore-barren rocks of 0.57–1.02,19.3–24.1 and 0.40–0.45,respectively,indicating the former has an adakitic affinity,while the latter has a non-adakitic affinity.The ore-related rocks have enriched zircon Hf isotopes withε_(Hf)(t)values of-15.9 to-5.5 and T_(DMC)ages of 2408–1655 Ma and apatite Sr-Nd isotopes,indicating that the ore-related magmas were mainly originated from partial melting of subducted oceanic crust.The orebarren rocks have higherε_(Hf)(t)values of-6.6 to-4.6 and lower T_(DMC)ages of 1598–1469 Ma and apatite Sr-Nd isotopes,indicating a lithospheric mantle source.The ore-related rocks have higher oxygen fugacity of mean∆FMQ+2.00 and X_(F)/X_(OH)of 8.36–175 than the ore-barren rocks of mean∆FMQ+1.43 and3.72–4.96.It was inferred that magma source,water content,and oxygen fugacity emerge as critical factors governing the regional Cu-Au mineralization potential.
