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江绍断裂带晚中生代镁铁质火山岩成因及其深部过程意义
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  • 英文篇名:Petrogenesis and geodynamic implications of Late Mesozoic mafic volcanic rocks along the Jiangshan-Shaoxing fault in SE China
  • 作者:秦社彩 ; 范蔚茗 ; 郭锋
  • 英文作者:QIN She Cai;FAN Wei Ming;GUO Feng;Guangzhou Institute of Geochemistry,Chinese Academy of Sciences;
  • 关键词:软流圈-岩石圈相互作用 ; 地球化学 ; 镁铁质火山岩 ; 中生代 ; 江绍断裂带
  • 英文关键词:Lithosphere-asthenosphere interaction;;Geochemistry;;Mafic volcanic lavas;;Late Mesozoic;;The JiangshanShaoxing fault
  • 中文刊名:YSXB
  • 英文刊名:Acta Petrologica Sinica
  • 机构:中国科学院广州地球化学研究所;
  • 出版日期:2019-06-15
  • 出版单位:岩石学报
  • 年:2019
  • 期:v.35
  • 基金:国家自然科学杰出青年基金项目(41525006);; 联合基金项目(U1701461);; 广东省特支计划项目(2015TX01Z219)联合资助
  • 语种:中文;
  • 页:YSXB201906016
  • 页数:15
  • CN:06
  • ISSN:11-1922/P
  • 分类号:296-310
摘要
本文对沿江绍断裂带的江山和浦江两地区中生代镁铁质火山岩进行了Ar-Ar年代学、岩石学和元素-同位素地球化学研究。Ar-Ar年代学结果显示,江山玄武岩的形成年龄约为99Ma,为晚白垩世喷发产物;浦江玄武岩和玄武质安山岩的喷发时间为111~112Ma,属于早白垩世。两区中生代镁铁质火山岩都为中钾钙碱性系列,根据其地球化学指标可划分为三组:第1组为江山OIB型玄武岩,在微量元素组成上无Nb-Ta亏损和Pb负异常,高ε_(Nd)(t)和低(~(87)Sr/~(86)Sr)_i比值,总体上显示出类似洋岛玄武岩的元素-同位素组成特征;第2组为高钛磷玄武岩,Nb-Ta弱负异常和明显Pb正异常,中等ε_(Nd)(t)和(~(87)Sr/~(86)Sr)_i比值;第3组为低钛磷玄武岩,强烈Nb-Ta负异常和中等Pb正异常,低ε_(Nd)(t)(-6.0~-3.7)和高(~(87)Sr/~(86)Sr)_i为特征。三组镁铁质火山岩相互之间缺乏分异演化关系,也不是同一母岩浆经历地壳混染作用的结果。对比三组镁铁质火山岩的La/Nb、Ba/Nb、Zr/Ba比值和Sr-Nd同位素模拟结果,我们认为江绍断裂带晚中生代玄武岩为软流圈-岩石圈相互作用的产物,从早期(111~112Ma)到晚期(99Ma)镁铁质岩浆地幔源区软流圈组分的比例越来越多而岩石圈成份逐渐减少的趋势。考虑到该区晚中生代的盆岭构造格局与邻区郴州-临武断裂带同时期镁铁质岩浆的产出特点,华南地区在早白垩世晚期到晚白垩世期间发生了强烈的岩石圈伸展-减薄作用。
        This paper presents Ar-Ar ages,major&trace element and Sr-Nd isotopic compositions of the mafic volcanic rocks from the Jiangshan and Pujiang regions along the Jiangshan-Shaoxing fault in SE China,with aims to understand their petrogenesis and geodynamic processes.Ar-Ar dating results show that the Jiangshan basalts erupted at ca.99Ma during Late Cretaceous,while the Pujiang mafic lavas(include basalts and basaltic andesites)erupted at ca.111~112Ma,corresponding to Early Cretaceous.The basaltic lavas from both localities show medium-K calc-alkaline affinities and can be further subdivided into three groups on the basis of geochemical variations.Group 1 is the Jiangshan basalt with similar geochemical compositions to oceanic island basalt(OIB),characterized by negligible Nb-Ta anomalies and no negative Pb anomalies and the highestε_(Nd)(t)(+4.4~+5.8)and lowest(~(87)Sr/~(86)Sr)_i(0.7049~0.7050).Group 2 is the Ti-and P-rich basalt from Pujiang,featured by weakly negative Nb-Ta anomalies and strongly positive Pb anomalies,and moderately radiogenic Nd(ε_(Nd)(t)=+1.5~+2.1)and Sr((~(87)Sr/~(86)Sr)_i=0.7062~0.7067)isotopic compositions.Group 3 is the Ti-and P-poor basaltic andesite from Pujiang,showing strongly negative Nb-Ta anomalies and positive Pb anomalies,and the lowestε_(Nd)(t)(-6.0~-3.7)and highest(~(87)Sr/~(86)Sr)_i(0.7083~0.7086).The geochemical variations can be interpreted through neither magmatic differentiation nor crustal contamination or assimilation via fractional crystallization.The comparisons of La/Nb,Ba/Nb and Zr/Ba and further Sr-Nd isotopic modelling results of the three groups suggest their derivation from a hybrid source through different proportional mixing of an enriched lithospheric mantle and convective asthenosphere.From 111~112Ma to 99Ma,the contribution of the enriched mantle component has been decreased with the increasing involvement of the asthenosphere,consistent with reinforced degree of lithospheric extension.In combination with the basin-range tectonic framework in SE China and similar petrogenesis of the contemporaneous basalts from the adjacent regions such as in the area along the Chenzhou-Linwu Fault,it is reasonable to conclude that the SE China experienced an extensive lithospheric extensionthinning during the early to late Cretaceous time.
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