十行带南带圆珠顶花岗质斑岩年代学、地球化学及对Cu-Mo矿化的意义
The Shi-Hang zone is an important NE-SW-trending Mesozoic magmatic belt inSouth China,which is dominated by granites with relativelyhigh εNd(t)values andyoung TDM model ages.Here,we present laser ablation inductively coupled plasmamass spectrometry(LA-ICP-MS)zircon U–Pb ages,major and trace elementcompositions,and Sr-Nd-Hf isotope data for the Yuanzhuding porphyritic granitoidswithin the southwestern Shi-Hang zone,and use these data to determine the origin ofthis granitoid and its relationship with Cu–Mo mineralization.Zircon U–Pb datingindicates that these granitoids were emplaced at 157.8±1.1Ma. They have initial87Sr/86Sr ratios of 0.70941-0.71398,εNd(t) values of -3.15 to -2.02, and in situ zirconεHf(t) values of +1.71 to +6.17.Geochemically,most of them are high-K calc-alkalineand show an adakitic affinity.They are more likely to emplace in a continental arcsetting related to westward subduction of the palaeo-Pacific plate. Their parentalmagmaoriginated chiefly from the overlying sediments of the downgoing slab,andsubsequently interacted withthe lithospheric mantle wedge at the temperatures of～790℃.High oxygen fugacity during magmatic evolution played a crucial role in thedevelopment of Cu–Mo mineralization within the Yuanzhuding.The discovery of theYuanzhuding deposit implies that theChenzhou–Huaiji fault belt is most likely prospective for mineral exploration for porphyry Cu–Mo deposits.
岩石学 花岗质斑岩 年代学 地球化学 Cu-Mo矿化
钟立峰 李杰 彭头平 夏斌 刘立文
中国科学院南海海洋研究所,中国科学院边缘海地质重点实验室,广州 510301 中国科学院广州地球化学研究所,同位素地球化学国家重点实验室,广州 510640 中山大学,海洋石油勘探开发广东普通高校重点室验室,广州 510006 广东省地质局第五地质大队,肇庆 526020
国内会议
广州
中文
696-697
2013-10-01（万方平台首次上网日期，不代表论文的发表时间）