摘要
根据硅质岩的结构、构造,生物类型、保存特征,岩石共生组合和古地磁、古构造分析,认为苏皖地区下二叠统孤峰组硅质岩形成于赤道地带的深海环境,处于裂陷活动产生的凹槽内。
Abstract
The radiolarian siliciliths of the Lower Permian Gufeng Formation inJiangsu-Anhui Region are composed of well-preserved radiolarian and siliceoussponge bodies. Radiolarians are mainly and , the contentis generally more than 60%, and in some places even up to 80%. The alternationof the mudstone, shale and pyroclastic rock associated with radiolarian silici-liths are characterized by containing plenty of ferromanganese concretion, lackingshallow-water organisms and devoid of carbonate. This is similar with presentdeepsea sediments. According to paleomagnetic analysis, this region used to be nearthe equator during the Early Permian, and this condition fits in the distributionof deep-sea radiolarian ooze in present equator. All these said above show thatthe s?liciliths were formed in deepsea and distributed in deep trough resultedfrom rift faulting.
论文详情