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地球学报  2009 

下江群沉积地质特征及其对华南新元古代构造演化的约束

DOI: 10.3975/cagsb.2009.04.10

Keywords: 下江群,华南,新元古代,沉积地质,弧后盆地

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Abstract:

华南西部新元古代裂陷纪大地构造属性和原型盆地性质是一个涉及到扬子古陆在全球构造中的定位、且争议较大的基础地质问题。新元古代下江群发育于强变形变质的盐边群和弱变形变质的板溪群之间,处于以滨浅海沉积为主的板溪群向深海沉积转化的过渡带内。下江群以浊流沉积的杂砂岩为主,沉积物扩散方向指向西。下江群清水江组砂岩骨架颗粒统计分析表明,物源来自再旋回造山带。常量元素地球化学特征显示,下江群碎屑岩系形成于活动陆缘区的弧后盆地靠大陆一侧。结合盐边群、苏雄组大地构造属性及其与下江群的空间关系,推测当时的华南西部处于汇聚型板块边缘内,总体属弧后伸展型盆地。

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