The Daheishan porphyry Mo deposit was recently discovered in the northern segment of the Great Xing'an Range, NE China. Three main types of granitoids are identified in this deposit: granodiorite, fine‐grained granite, and porphyritic granite. The orebodies are dominantly hosted within the granodiorite and in the contact zone between the granodiorite and tuff or hornfels, while no mineralization has been found in the fine‐grained granite or the porphyritic granite. We present in situ LA‐ICP‐MS zircon U‐Pb dates for the granodiorite, fine‐grained granite, and porphyritic granite, which yielded 146.9 ± 1.1 Ma (2σ), 146.6 ± 1.7 Ma (2σ), and 149.7 ± 4.2 Ma (2σ), respectively. Their ε_Hf(t) values range from 3.9 to 12.2, associated with young crustal model ages (T_DM2) ranging from 524 Ma to 849 Ma, indicating that their parental magmas may have been generated by partial melting of the Neoproterozoic–Cambrian crustal components. The formation of the Daheishan deposit was genetically related to the subduction of the Paleo‐Pacific Plate.

《地球科学》(ISSN 1000-2383;CN42-1874/P) (原刊名《地球科学——中国地质大学学报》ISSN 1000-2383;CN42-1233/P)，创刊于1957年，是由教育部主管、中国地质大学主办的综合性地学学术理论期刊，月刊，2015年改名为《地球科学》,她以反映中国地质大学教学与科研最新的、高水平的基础地质、应用地质、资源与环境地质及地学工程技术研究成果为主要任务。

The Youjiang metallogenic province (YMP) is a famous ore-concentrating area in South China, known for its substantial Carlin-type gold deposits, antimony deposits, and mercury deposits. Previous studies have yielded conflicting views regarding the ages of mineralization in this area, particularly regarding the occurrence of Yanshanian versus Indosinian ore-forming events during the Mesozoic era. To resolve these discrepancies, this study utilized in situ LA-ICP-MS U-Pb dating on carbonate minerals from the Lannigou Carlin-type Au deposit, the Lanmuchang Hg-(Tl) deposit, and the Sixiangchang Hg deposit to accurately determine their mineralization ages. Our results indicate that the three deposits formed at 137 ± 9 Ma, ~97 Ma, and 454 ± 21 Ma, respectively. By integrating previously reported geochronological data, we propose that the low-temperature Au-As-Sb-Hg-Tl deposits in the YMP were formed during two major periods, Late Triassic and Late Jurassic to Cretaceous, with the latter being more prevalent. Additionally, there was a Paleozoic hydrothermal mercury mineralization event at the northeastern edge of this region. These newly acquired data significantly enhance our understanding of multistage, low-temperature mineralization events in the YMP. Our study also demonstrates that in situ carbonate U-Pb dating is an excellent method for investigating the timing of low-temperature mineralization events.

《地球科学》(ISSN 1000-2383;CN42-1874/P) (原刊名《地球科学——中国地质大学学报》ISSN 1000-2383;CN42-1233/P)，创刊于1957年，是由教育部主管、中国地质大学主办的综合性地学学术理论期刊，月刊，2015年改名为《地球科学》,她以反映中国地质大学教学与科研最新的、高水平的基础地质、应用地质、资源与环境地质及地学工程技术研究成果为主要任务。

攀西地区与二叠纪镁铁-超镁铁岩有关的钒钛磁铁矿床和铜镍硫化物矿床伴生有可观的钴资源。为实现对铜镍硫化物矿床中钴的资源评价与综合利用,本文选取攀西地区的羊合五铜镍矿床为例,阐述钴在全岩和矿物中的分布特征,查明其赋存状态,在此基础上讨论了岩浆作用过程中钴的富集机制。在全岩层面,辉石岩带具有最高的钴含量(177×10^-6),其次为斜长辉石岩带(133×10^-6)、橄榄辉石岩带(103×10^-6)、辉长岩带(63.4×10^-6)。在矿物层面,各类矿物平均钴含量从高到低依次为镍黄铁矿(3.56%)、橄榄石(175×10^-6)、磁黄铁矿(96.6×10^-6)、角闪石(54.8×10^-6)、钛铁矿(34.2×10^-6)、辉石(31.0×10^-6)、黄铜矿(1.15×10^-6)、斜长石(0.05×10^-6)。矿物微区原位分析结果结合镜下观察发现镍黄铁矿为矿床中最重要的载钴矿物。镍黄铁矿根据其形态、分布位置可分为三类:(1)分布于硫化物颗粒边缘,呈棒状或楔状充填于硫化物颗粒中的填隙状镍黄铁矿(PnI);(2)分布于硫化物颗粒内部,呈规则或较规则状的颗粒状镍黄铁矿(PnII);(3)分布于硫化物颗粒内部和边缘,呈出溶针状、毛刷状或火焰状的出溶状镍黄铁矿(PnIII)。这三类镍黄铁矿的钴含量依次降低,分别为5.44%、3.54%、1.70%,反映了随着成矿过程推进,岩浆温度降低,结晶出的镍黄铁矿形态也发生变化,钴含量越来越低。矿物中的Co-Ni(Fe)负相关表明钴主要以类质同象形式替换Ni²⁺、Fe²⁺等二价阳离子。钴富集机制主要包括硫化物熔离、硫化物熔体结晶和硅酸盐熔体的分异结晶作用。硫化物熔离过程的钴富集系数为28~35,根据母岩浆与镍黄铁矿钴含量计算得硫化物熔体结晶过程中钴富集系数为10~12。硫化物熔离和硫化物熔体结晶对钴的富集效率最高,是最重要的富集机制。本文依据上述地质、地球化学和矿物学研究提出了攀西地区铜镍硫化物矿床中钴的富集机制模型。