摘要
石界河群小寨组主要为砂、泥质碎屑沉积,按岩性可分为四个组合,下部黑云母石英片岩与变质杂砂岩组合及变质副砾岩与变质杂砂岩组合为浊流及碎屑流沉积,上部的变质砾岩与变质含砾砂岩组合及变质杂砂岩、千枚岩组合为扇三角洲沉积。综合上述沉积相组合,提出小寨组并非大洋或深海盆地,而应为靠近陆源地的断陷盆地中的碎屑沉积。
Xiaozhai Formation of the Shijiehe Group is mainly composed of metamorphosed terrigenous rocks. The lower part of the formation includes two rock associations, i. e. the biotite quartz schist-metagraywacke association and metaparaconglomerate-metagraywacke association derived from turbidity current and debris flow sediments. The upper part includes two rock association, meta-conglomerate-meta-conglomeratic sandstone association and metagraywacke-phyllite association derived from fan-delta sediments. The authors propose that the Xiaozhai Formation should be the product of sedimentation in a rift basin near continent rather than in ocean or a deep sea basin.
基金
国家自然科学基金
关键词
河南省
小寨组
沉积相
断陷盆地
Henan , Xiaozhai Formation, Sedimentary facies, Rift basin
