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二叠纪地幔柱与地表系统演变
Permian Mantle Plumes and Earth's Surface System Evolution

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徐义刚 1   钟玉婷 1   位荀 2   陈军 1   刘海泉 3   颉炜 1   罗震宇 1   李洪颜 1   何斌 1   黄小龙 1   王焰 4   陈赟 5  
文摘 本文简要总结了国家重点基础研究发展计划项目《二叠纪地幔柱构造与地表系统演变》的主要研究进展: (1)峨眉山大火成岩省形成于~259Ma,持续时间小于1Ma,是地幔柱头熔融的产物;塔里木大火成岩省为多阶段喷发(~ 300,~ 290, 280Ma),持续时间超过20Ma,是孕育地幔柱活动的产物。(2)利用综合地球物理方法发现峨眉山大火成岩省内带上下地壳界面“消失”、下地壳增厚且具高波速特征、岩石圈地幔减薄,是地幔柱熔融产物在地壳不同深度底侵和内侵的结果。(3)完善了大火成岩省岩浆矿床的形成机理,构建了地幔柱成矿系统的基本框架,提出地幔柱结构、岩浆源区特征、结晶分异过程、硫化物饱和、地壳混染和岩浆侵位过程等是地幔柱成矿的关键控制因素。(4)从相对和绝对时间角度确证了西伯利亚和峨眉山大火成岩省分别对应于二叠纪末(PTB)和瓜德鲁普统-乐平统界线(GLB)生物灭绝事件;重建了华南二叠-三叠纪海水温度和pH值的演变历史,使甄别二叠纪末生物大灭绝的直接诱因成为可能。
其他语种文摘 This paper highlights the main research progresses made under the support of the National 973 project entitled “Permian Large Igneous Province and Surface System Evolution”.(1) The Emeishan Large Igneous Province(LIP) was emplaced at ~ 259Ma with a duration of <1Ma,most likely resulted from melting of a mantle plume head. The Tarim LIP was emplaced at three episodes with a duration of >20Ma,most likely related to an incubating mantle plume under a thick craton. (2) Comprehensive geophysical survery revealed that the crust in the inner zone of the Emeishan LIP is characterized by the lack of the upper-lower crust boundary,presence of a thick and high velocity lower crust and a thinned lithospheric mantle. All these features are attributable to upwelling of an ancient mantle plume and associated magmatic underplating and intraplating at different level of the crust. (3) The formation mechanism of magmatic ore deposits associated with LIPs is refined,and a framework of plume-related mineralization system is established. Following has been identified as key controlling factors in plume-related mineralization: Structure of a plume,magma source,crystal fractionation,sulfide saturation,crustal contamination,and intrusion processes. (4) Both relative temporal correlation and absolute dating confirm the links between the Siberian Traps and Permo-Triassic Boundary(PTB) mass extinction,and between the Emeishan LIP and Guadlupian-Lopingian Boundary(GLB) mass extinction. The reconstruction of Permian-Triassic seawater temperature and pH makes it possible to discriminate the triggers of the end-Permian mass extinction.
来源 矿物岩石地球化学通报 ,2017,36(3):359-373 【核心库】
DOI 10.3969/j.issn.1007-2802.2017.03.001
关键词 大火成岩省 ; 地幔柱 ; 二叠纪 ; 成矿系统 ; 生物灭绝
地址

1. 中国科学院广州地球化学研究所, 同位素地球化学国家重点实验室, 广州, 510640  

2. 国家海洋局第一海洋研究所, 国家海洋局海洋沉积与环境地质实验室, 山东, 青岛, 266061  

3. 中国科学院广州地球化学研究所, 中国科学院院边缘海与大洋地质重点实验室, 广州, 510640  

4. 中国科学院广州地球化学研究所, 中国科学院院矿物学与成矿学重点实验室, 广州, 510640  

5. 中国科学院地质与地球物理研究所, 岩石圈演化国家重点实验室, 北京, 100083

语种 中文
文献类型 研究性论文
ISSN 1007-2802
学科 地质学
基金 中国科学院先导B专项 ;  国家973计划
文献收藏号 CSCD:6012220

参考文献 共 61 共4页

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引证文献 24 篇

1 陈赟 古地幔柱作用“遗迹”的深部地球物理探测———以峨眉山大火成岩省为例 矿物岩石地球化学通报,2017,36(3):394-403
CSCD被引 14 次

2 郭希 峨眉山大火成岩省地壳横波速度结构特征及其动力学意义 地球物理学报,2017,60(9):3338-3351
CSCD被引 7 次

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