投稿时间：2025-07-09
修订日期：2025-10-17
网络发布日期：2026-01-04
中文摘要:赣南新安钼矿床位于南岭成矿带与武夷成矿带交汇部位，是新探明的中型钼矿床。钼矿体主要产于花岗闪长岩与围岩侵入接触界线附近，以浸染型和细脉-浸染型钼矿化为主，具有斑岩型钼矿床矿化特征。花岗闪长岩地球化学分析显示，岩石具有高碱、富Al及贫Ti、Mg、P特征，属弱过铝质钙碱性岩类；轻重稀土分馏明显，Eu无异常，稀土配分曲线为右倾型。文章利用LA-ICP-MS锆石U-Pb定年方法测得花岗闪长岩年龄为162.5~170.9 Ma，谐和年龄为(165.4±0.3)Ma(MSDW=0.6)，成岩时代属中侏罗世。锆石n(176Lu)/n(177Hf)=0.000 916~0.001 572，εHf(t)=−10.9~−5.5，二阶段模式年龄（TDM2）为1.56~1.90 Ga，显示其岩浆起源于古元古代地壳部分熔融，可能混有不同程度的幔源岩浆物质。综合分析认为，新安钼矿床成岩与成矿作用均发生于中侏罗世，是赣南新厘定的Mo成矿作用期，为区内钼矿找矿工作提出新方向。
Abstract:The Xin’an Mo deposit is a newly identified medium-sized Mo deposit in southern Jiangxi Province, which is located at the junction of the Nanling and Wuyi metallogenic belts. The disseminated and disseminated-veinlet Mo ore bodies are mainly distributed near the intrusive contact boundary between granodiorite and the surrounding rock, which has the mineralization characteristics of porphyry Mo deposit. The whole-rock geochemical analyses show that granodiorite has the features of week peraluminous, calc-alkali series, high Al2O3 and LREE contents, along with low TiO2, MgO, and P2O5 Values. The REE distribution curve shows a typical right-skewed distribution pattern. LA-ICP-MS Zircon U-Pb dating of granodiorite yields emplacement age of 162.5~170.9 Ma, with a concordia age of (165.4±0.3)Ma (MSWD=0.6), indicating the magmatic intrusion diagenesis occurred in the Middle Jurassic. The n(176Lu)/n(177Hf) and εHf(t) values are 0.000 916~0.001 572 and −10.9~−5.5, respectively, and TDM2 are 1.59 Ga~1.90 Ga, indicating primary reworking of the Paleoproterozoic crust with different degrees of mantle-derived magma material. The comprehensive analysis shows that the diagenesis and Mo mineralization in Xin’an Mo deposit both occurred during the Middle Jurassic, representing a newly defined Mo mineralization phase in southern Jiangxi Province. This provides a new direction for Mo prospecting work in this region.
keywords:Xin’an Mo deposit granodiorite geochemical characteristics zircon U-Pb age Lu-Hf isotope southern Jiangxi Province
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基金项目:本文得到江西省地质局青年科技带头人培养项目（编号：2024JXDZKJRC01）和国家重点研发计划项目（编号：2021YFC2901702）联合资助
引用文本：
谢刚,李伟,陈斌锋,彭琳琳,连敦梅.2025.赣南新安钼矿床花岗闪长岩岩石地球化学、锆石U-Pb测年、Hf同位素研究及其意义[J].矿床地质,44(6):1209~1223XIE Gang,LI Wei,CHEN BinFeng,PENG LinLin,LIAN DunMei.2025.Geochemical characteristics, U-Pb age and Hf isotope of zircons from granodiorite in Xin’an Mo deposit, southern Jiangxi Province and its significance[J].Mineral Deposits44(6):1209~1223
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