闽西-赣南早-中侏罗世盆地及其火成岩特征

邓平 舒良树 余心起 王彬 谭正中 孙岩. 闽西-赣南早-中侏罗世盆地及其火成岩特征[J]. 岩石学报, 2004, 20(3): 521-532.
引用本文: 邓平 舒良树 余心起 王彬 谭正中 孙岩. 闽西-赣南早-中侏罗世盆地及其火成岩特征[J]. 岩石学报, 2004, 20(3): 521-532.
Early-Middle Jurassic basins and features of igneous rocks in the western Fujian-southern Jiangxi region[J]. Acta Petrologica Sinica, 2004, 20(3): 521-532.
Citation: Early-Middle Jurassic basins and features of igneous rocks in the western Fujian-southern Jiangxi region[J]. Acta Petrologica Sinica, 2004, 20(3): 521-532.

闽西-赣南早-中侏罗世盆地及其火成岩特征

  • 基金项目:

    获国家自然科学基金(批准号40132010)、面上项目(批准号40172067、40372092)资助

Early-Middle Jurassic basins and features of igneous rocks in the western Fujian-southern Jiangxi region

  • 闽西-赣南地区早、中侏罗世陆相盆地带东起福建永定,经江西寻乌到龙南,断续延伸约250km,宽60~80km.受后期构造破坏和花岗岩浆侵入影响,现呈肢解散碎的残留盆地面貌.盆地边界特征和盆区岩层节理测量统计结果反映该区自晚三叠世以来,先后经历了近S-N向水平挤压(T3-J1E),S-N向垂向挤压、近E-W向水平伸展(J1L-J2),SE-NW向挤压(K1)和近E-W向挤压、S-N向伸展(K2)等复杂的演化过程.早-中侏罗世强烈的拉张-断陷作用导致盆区大量双峰式火山岩的喷发,其基性端员玄武岩的颗粒锆石U-Pb年龄值为170±1Ma,酸性端员流纹岩Rb-Sr等时线年龄为179Ma~165±2Ma.流纹岩具有高的SiO2、Al2O3、K2O含量,ANKC值>1.1;轻稀土富集、稀土总量高,铕亏损,具明显Eu负异常;富集Rb、Th,贫化Ba、Ti、P、Nb、Zr等特点,属富钾过铝火山岩类.与之共生的玄武岩则以富硅贫碱为特征,轻稀土轻度富集,铕异常不明显;弱富集Rb、Ba、Th、Ce,贫Nb、Zr、Y,配分样式呈上凸型,属拉斑系列玄武岩类,反映一种后造山的陆内裂谷环境.闽西-赣南地区盆山格局的形成经历过多期地球动力学演化前中生代近E-W向古亚洲构造域的基底阶段,晚三叠世-早侏罗世早期挤压造山阶段,早侏罗世晚期-中侏罗世裂谷盆地阶段,早白垩世太平洋构造域对本区的置换和改造阶段,包括早期的火山-岩浆活动和晚期的伸展断陷盆地作用.
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出版历程
修回日期:  2003-07-11
刊出日期:  2004-05-31

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