巴布亚新几内亚镍元素地球化学特征及成矿潜力  

Geochemical characteristics and metallogenic potential of nickel in Papua New Guinea

作　　者：赵宇浩[1,2,3] 杨志明 朱意萍[1] Kumul CONRAD[4] 杜等虎 Mosusu NATHAN[4] 王天刚 姜瀚涛[1] 姚仲友 ZHAO Yuhao;YANG Zhiming;ZHU Yiping;Kumul CONRAD;DU Denghu;Mosusu NATHAN;WANG Tiangang;JIANG Hantao;YAO Zhongyou(Nanjing Center,China Geological Survey,Nanjing 210016,China;China University of Geosciences(Beijing),Beijing 100083,China;Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China;Mineral Resources Authority of Papua New Guinea,Port Moresby 121,Papua New Guinea;China National Gold Group Co.,Ltd.,Beijing 100011,China)

机构地区：[1]中国地质调查局南京地质调查中心,江苏南京210016 [2]中国地质大学(北京),北京100083 [3]中国地质科学院地质研究所,北京100037 [4]巴布亚新几内亚矿产资源局,莫尔兹比港121 [5]中国黄金集团有限公司,北京100011

出　　处：《地学前缘》2025年第1期183-193,共11页Earth Science Frontiers

基　　金：中国地质调查局地质调查项目(DD20230129);国家重点研发计划项目(2021YFC291804)。

摘　　要：巴布亚新几内亚位于太平洋板块和印度-澳大利亚板块的汇聚边缘,由3个构造单元组成。巴布亚新几内亚发育两种镍矿化类型。2015—2018年开展的巴布亚新几内亚国家尺度地球化学填图,在高地地区、巴布亚半岛和新几内亚群岛采集了1399件水系沉积物样品。本文研究了巴新镍的地球化学背景、空间分布特征和成矿潜力。巴新镍含量在2.7~2430.0μg/g之间,中位数(地球化学基准值)为42.0μg/g,接近上地壳镍元素丰度,高于欧洲、澳大利亚、北美和中国的镍地球化学基准值。由于广泛发育镁铁质-超镁铁质岩浆岩,由巴布亚褶皱带、新几内亚冲断带、奥罗褶皱带、东部褶皱带、东巴布亚复合地体、巴布亚群岛、伯瓦尼-托里塞利地体和菲尼斯特雷地体组成的中央弧陆碰撞带的镍基准值高于美拉尼西亚岩浆弧。地球化学图中,四月蛇绿岩、马鲁姆蛇绿岩和巴布亚超镁铁质岩带等蛇绿杂岩体与高镍含量的区域具有高度耦合对应关系。通过本次工作,圈定了7处镍地球化学省和8处镍地球化学异常区,主要分布于新几内亚逆冲带。8处异常区均具有发育红土型镍矿的潜力,可作为下一阶段巴新镍矿找矿方向。Located at the convergent boundary of the Pacific and Indo-Australian Plates,Papua New Guinea(PNG)consists of three tectonic units and features two nickel mineralization types.National-scale geochemical mapping was conducted in PNG between 20152018,where 1399 samples of stream sediments were collected from the Highlands Region,Papua Peninsula,and New Guinea Islands.This paper reports preliminary study of the geochemical background,spatial distribution characteristics,and metallogenic potential of nickle in PNG.The nickle concentration ranged between 2.72430.0μg/g,with a median value of 42.0μg/g,close to the Ni abundance in the Earth’s upper crust and higher than the geochemical baselines of nickle in Europe,Australia,North America,and China.With widely developed mafic-ultramafic magmatic rocks,the Central Arc Land Collision Zone-consisting the Papuan Fold Belt,New Guinea Thrust Belt,Finisterre Terrane,Aure Fold Belt,Eastern Fold Belt,and Eastern Papuan Composite Terrane—had higher nickle baseline level than the Melanesian Arc.The ophiolitic complexes,such as the April ophiolite,Marum ophiolite,and Papua ultramafic belt,showed good correlation with Ni-enrichment areas.Seven nickle geochemical provinces and eight nickel anomaly areas with laterite mineralization potential were delineated.

关 键 词：国家尺度地球化学填图 镍 异常 红土型矿化 巴布亚新几内亚 

分 类 号：P595[天文地球—地球化学]