| 兴蒙造山带北部岩石圈地幔橄榄岩氧逸度特征研究 |
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| 引用本文： | 刘金霖,李怀滨,王建,张云峰.兴蒙造山带北部岩石圈地幔橄榄岩氧逸度特征研究[J].岩石学报,2021,37(7):2073-2085. |
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| 作者姓名： | 刘金霖 李怀滨 王建 张云峰 |
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| 作者单位： | 东北石油大学地球科学学院, 大庆 163318;自然资源部东北亚矿产资源评价重点实验室, 长春 130026;东北石油大学三亚海洋油气研究院, 三亚 572024;吉林大学地球科学学院, 长春 130026 |
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| 基金项目： | 本文受自然资源部东北亚矿产资源评价重点实验室开放课题基金（DBY-KF-18-06）、东北石油大学国家基金培育基金（重点）（2017PYQZL-01）和东北石油大学人才工程科研启动基金（rc201703）联合资助. |
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| 摘 要： | 在大兴安岭北部的诺敏和科洛地区的新生代玄武岩中发现了尖晶石相的橄榄岩包体。地幔橄榄岩中橄榄石的Mg~#说明了研究区上地幔具有部分难熔的特点。在橄榄石含量与Fo图解中,有一部分橄榄岩包体落在太古代和元古代的地幔区域,揭示了研究区的岩石圈地幔存在古老岩石圈地幔的残余。研究区方辉橄榄岩与二辉橄榄岩有显示高氧逸度值FMQ+1.95～3.01,这与一般情况下相对还原的古老岩石圈地幔的低氧逸度值形成鲜明对比,可能为古生代的古亚洲洋以及中生代的古太平洋相继俯冲到了兴蒙造山带之下,导致当时岩石圈地幔的氧化所致。在地幔包体的反应边中发现了富钾熔体(K20 1%-6%),这被认为研究区地幔经历了多期富钾流体活动,富钾流体的来源可能与俯冲再循环的壳源物质有关。
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| 关 键 词： | 造山带地幔 地幔橄榄岩 氧逸度 钾质地幔熔体 俯冲作用 |
| 收稿时间： | 2021/4/13 0:00:00 |
| 修稿时间： | 2021/6/23 0:00:00 |
Characteristics of oxygen fugacity of mantle peridotites in the northern Xing'an-Mongolia Orogenic Belt |
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| LIU JinLin,LI HuaiBin,WANG Jian,ZHANG YunFeng.Characteristics of oxygen fugacity of mantle peridotites in the northern Xing'an-Mongolia Orogenic Belt[J].Acta Petrologica Sinica,2021,37(7):2073-2085. |
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| Authors: | LIU JinLin LI HuaiBin WANG Jian ZHANG YunFeng |
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| Institution: | College of Earth Sciences, Northeast Petroleum University, Daqing 163318, China;Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Changchun 130026, China;Sanya Offshore Oil & Gas Research Institute, Northeast Petroleum University, Sanya 572024, China;College of Earth Sciences, Jilin University, Changchun 130026, China |
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| Abstract: | Spinel peridotite xenoliths have been found in Cenozoic basalts from the Nuomin and Keluo areas in the northern Daxinganling. The Mg# values of olivines in the mantle peridotites indicates that the upper mantle in the study area is partially refractory. According to the olivine modal abundance and Fo diagram, a part of peridotite xenoliths fell in the Archean and Proterozoic mantle fields, revealing remnants of ancient lithospheric mantle in the lithospheric mantle of the study area. In the study area, harzburgite and lherzolite show high oxygen fugacity values (FMQ + 1.95~3.01), which is in sharp contrast to the low values of the relatively reduced ancient lithospheric mantle. It is possible that the Paleozoic Paleo-Asian Ocean and Mesozoic Paleo-Pacific subducted successively under the Xing''an-Mongolia Orogenic Belt, resulting in the oxidation of the lithospheric mantle at that time. K2O (1%~6%) is found in the reaction edge of mantle xenoliths. It is considered that the mantle in the study area has experienced multiple periods of K-rich melt activity, and the source of K-rich melt may be related to the crust source material recycled by subduction. |
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| Keywords: | Orogenic mantle Mantle peridotite Oxygen fugacity Potash mantle melt Subduction |
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