| 小兴安岭南段翠峦杂岩体成因及构造环境：来自地球化学及锆石Hf同位素的证据 |
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| 引用本文： | 杨元江, 张立东, 杨文鹏, 李成禄, 郭凤磊, 赵寒冬, 邓昌州, 沈龙, 申亮. 2024. 小兴安岭南段翠峦杂岩体成因及构造环境：来自地球化学及锆石Hf同位素的证据. 地质通报, 43(2~3): 416-428. doi: 10.12097/gbc.2022.09.019 |
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| 作者姓名： | 杨元江 张立东 杨文鹏 李成禄 郭凤磊 赵寒冬 邓昌州 沈龙 申亮 |
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| 作者单位： | 1.黑龙江省自然资源调查院, 黑龙江 哈尔滨 150036; 2.黑龙江省第一地质勘查院, 黑龙江 牡丹江 157011; 3.中国科学院地球化学研究所, 贵州 贵阳 550081; 4.中国地质调查局发展研究中心, 北京 100037 |
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| 基金项目： | 黑龙江省地质矿产局项目《黑龙江省多宝山矿集区银金矿床成矿规律研究与找矿预测》（编号：HKY202301）、中国地质调查局项目《黑龙江矿产地质志续编与产品服务》（编号：DD20221695-8）、黑龙江省国土资源公益项目《黑龙江省1∶5万矿调成果综合研究及找矿靶区优选》（编号：GY-2018003） |
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| 摘 要： | 通过对黑龙江省小兴安岭南段中奥陶世翠峦杂岩体的年代学、岩石地球化学、锆石Hf同位素特征的研究，探讨岩体的形成时代、成因、物质来源和构造背景。采用LA−ICP-MS锆石U−Pb定年，获得花岗闪长岩和二长花岗岩样品的年龄分别为463±2 Ma和462±2 Ma，时代为中奥陶世。全岩地球化学研究表明，岩石均具有高Si、高K富碱，贫Ti、Mg、Fe、P等特征。大离子亲石元素K、Rb富集，高场强元素Ti、Nb、Ta、P和HREE亏损，具有显著的负Eu异常（δEu=0.38~0.64），以上都显示岩浆的壳源特征。花岗闪长岩锆石的εHf(t)=2.4~ 3.4，数值集中且均分布于球粒陨石线之上，暗示岩浆源区为新生陆壳物质的部分熔融；地壳模式年龄TDMc=1070～1128 Ma，证实该地区存在中元古代地壳增生事件。本次研究认为，翠峦杂岩体形成于洋陆板块俯冲的构造环境。
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| 关 键 词： | 杂岩体 锆石U−Pb年龄 锆石Hf同位素 岩石成因 小兴安岭南段 |
| 收稿时间： | 2022-09-21 |
| 修稿时间： | 2023-02-27 |
Genesis and tectonic setting of Cuiluan plutonic complex in the south section of the Xiaoxing'an Mountains: Evidences of geochemical and zircon Hf isotope |
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| YANG Yuanjiang, ZHANG Lidong, YANG Wenpeng, LI Chenglu, GUO Fenglei, ZHAO Handong, DENG Changzhou, SHEN Long, SHEN Liang. 2024. Genesis and tectonic setting of Cuiluan plutonic complex in the south section of the Xiaoxing'an Mountains: Evidences of geochemical and zircon Hf isotope. Geological Bulletin of China, 43(2~3): 416-428. doi: 10.12097/gbc.2022.09.019 |
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| Authors: | YANG Yuanjiang ZHANG Lidong YANG Wenpeng LI Chenglu GUO Fenglei ZHAO Handong DENG Changzhou SHEN Long SHEN Liang |
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| Affiliation: | 1.Heilongjiang Institute of Natural Resources Survey, Harbin 150036, Heilongjiang, China; 2.The First Institute of Geological Exploration of Heilongjiang Province, Mudanjiang 157011, Heilongjiang, China; 3.Institute of Geochemistry Chinese Academy of Sciences, Guiyang 550081, Guizhou, China; 4.Development and Research Center, China Geology Survey, Beijing 100037, China |
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| Abstract: | This paper studies the chronology, rock geochemistry and zircon Hf isotopic characteristics of the Middle Ordovician Cuiluan plutonic complex in the south section of the Xiaoxing'an Mountains in Heilongjiang Province, focusing on the formation age, petrogenesis, magmatic material source and tectonic background of the rock mass. Using laser ablation plasma mass spectrometer (LA−ICP-MS) zircon U−Pb dating method, the ages of granodiorite and granite porphyry samples are dated to be 463±2 Ma and 462±2 Ma, i.e., Middle Ordovician. The study of rock geochemistry shows that both samples are characterized by high Si and K, rich alkali, and poor Ti, Mg, Fe, P, etc. It is enriched in LILE (e.g., Rb, K ), depleted in HFSE (e.g., Ti, Nb, Ta, P and HREE) with significant negative Eu anomalies（δ Eu= 0.38~0.64), which show the crust source characteristics of magma. Zircon εHf (t)=2.4~3.4, the values are concentrated and distributed above the chondrite line, indicating that the magma source area is the partial melting of the new continental crust material. TDMc = 1128~1070 Ma, confirming the existence of Mesoproterozoic crustal accretion events in this area. This study suggests that the Cuiluan complex was formed in the tectonic environment of subduction of oceanic and continental plates. |
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| Keywords: | plutonic complex zircon U−Pb ages zircon Hf isotope petrogenesis South of Xiaoxing'an Mountains |
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