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引用本文:谢燮,赵国斌,杨合群,杨生飞,任华宁,贾健,孙新春,黄增保. 甘肃北山孙家岭含钪岩体LA-ICP-MS锆石U-Pb测年及地质意义[J]. 中国地质, 2018, 45(3): 483-492.
XIE Xie,ZHAO Guobin,YANG Hequn,YANG Shengfei,REN Huaning,JIA Jian,SUN Xinchun,HUANG Zengbao. LA-ICP-MS zircon U-Pb dating and geological significance of the Sunjialing scandium mineralized intrusion in the Beishan region, Gansu Province[J]. Geology in China, 2018, 45(3): 483-492(in Chinese with English abstract).
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甘肃北山孙家岭含钪岩体LA-ICP-MS锆石U-Pb测年及地质意义
谢燮1, 赵国斌1, 杨合群1, 杨生飞1, 任华宁1, 贾健2, 孙新春3, 黄增保3
1.中国地质调查局西安地质调查中心, 国土资源部岩浆作用成矿与找矿重点实验室, 陕西 西安 710054;2.新疆维吾尔自治区地质调查院, 新疆 乌鲁木齐 830011;3.甘肃省地质调查院, 甘肃 兰州 730000
摘要:
孙家岭含钪岩体位于哈萨克斯坦板块中星星峡—明水—旱山微板块的雅满苏—红石山—黑鹰山晚古生代裂谷带。岩体侵位于下石炭统白山组,由含斜长石角闪石岩和角闪石岩组成,钪主要赋存于角闪石矿物中。含钪岩体属富铁质超基性岩,全岩成分以高碱、高铝为特征;稀土含量较高,轻稀土略富集,具有明显的负Eu异常;大离子亲石元素(LILE)K、Rb、Ba、Sr、U富集,相对亏损高场强元素(HFSE)Nb、Zr、Hf、Th及P。通过LA-MC-ICP-MS锆石U-Pb测年,首次获得孙家岭含钪岩体中角闪石岩形成于(339.5±2.6)Ma,表明该含矿岩体侵位及矿化作用发生于早石炭世,为裂谷拉张环境下伸展作用的产物。
关键词:  早石炭世  锆石U-Pb年龄  角闪石岩  孙家岭
DOI:10.12029/gc20180305
分类号:P588.1;P597+.3
基金项目:中国地质调查局地质矿产调查专项(12120113047300,12120113046700)资助。
LA-ICP-MS zircon U-Pb dating and geological significance of the Sunjialing scandium mineralized intrusion in the Beishan region, Gansu Province
XIE Xie1, ZHAO Guobin1, YANG Hequn1, YANG Shengfei1, REN Huaning1, JIA Jian2, SUN Xinchun3, HUANG Zengbao3
1.Xi′an Center of China Geological Survey, MLR key Laboratory for the study of Focused Magmatism and Giant ore Deposits Xi′an 710054, Shaanxi, China;2.Xinjiang Geological Survey Academy, Urumqi 830000, Xinjiang, China;3.Geological Survey of Gansu Province, Lanzhou 735000, Gansu, China
Abstract:
Located in the Yamansu-Hongshishan-Heiyingshan Late Paleozoic rift of Xingxingxia-Mingshui-Hanshan microplate in Kazakhstan plate, the Sunjialing scandium mineralized intrusion emplaced in the Early Carboniferous Baishan Formation and consists of plagioclase amphiboles and amphiboles, with scandium mainly occurring in the amphibole. Scandium mineralized intrusion belongs to iron-rich ultrabasic intrusion, whose components are characterized by high alkali and alumina. The content of rare earth is high, and the light rare earth is slightly enriched, with obvious negative δ (Eu) anomaly. LILE elements Rb, Ba, Sr and U are enriched whereas HFSE elements Nb, Zr, Hf, Th, and P, Ti are depleted. LA-MC-ICP-MS zircon U-Pb dating of the hornblende yielded an age of (339.5 ±2.6)Ma, which suggests that both the intrusion of the ore-bearing complex and the mineralization occurred in early Carboniferous in a rift environment.
Key words:  Early Carboniferous  U-Pb zircon ages  hornblendite  Sunjialing