胶莱盆地东北缘中生界粗碎屑岩段的沉积层序及含金性

胶莱盆地属于晚中生代断陷盆地，东北缘广泛出露中生界的粗碎屑岩系。在对其进行详细的野外宏观描述、室内微观鉴定及样品含金量测试的基础上，研究了粗碎屑岩段的沉积物组成、沉积类型和微观特征，建立了该岩段在不同地区的垂向沉积层序及典型展序组合类型。不同的水动力条件是造成砾岩层内部结构复杂性变化的主要原因。通过与国内外有关资料的对比分析，指出研究区粗碎屑岩段形成于干旱、近源快速堆积的陆上冲积扇环境，且探讨了其含金性。

Sedimentary Sequence and Gold-Bearing Behaviour of the Mesozoic Coarse Clastic Member,Northeast Border of Jiaolai Basin

The Jiaolai basin is a Late Mesozoic fault basin and has an extensive outcroping coarse elastic system in its northeast border. Based on the minute field macroexamination, indoor microexamination and gold-content test on the coarse elastic member of the study area,the paper discussed the form,type and microfeature of the deposits and established their sedimentary sequences and types of some typical depositional associations in the different areas. It was suggested that different depositional hydrodynamic condition is the main reason causing the complicated change of the inner texture in a conglomerate bed. By comparing domestic and abroad information, this paper pointed out that the coarse elastic member forms in a dry, proximal quickly-accumulated subaerial alluvial fan environment,and it also probed into the gold-bearing behaviour of this member.