河南登封地区上二叠统石千峰组风暴沉积特征

The storm deposits in the Upper Permian Shiqianfeng Formation in the Dengfeng region,Henan

河南登封地区上二叠统石千峰组以湖泊相碎屑岩为主,其中发育有典型的风暴岩沉积,在风暴岩中发育有冲刷面、丘状交错层理、包卷层理、波痕和泄水构造等风暴沉积构造,并存在典型的序列,自下而上可划为Sa,Sb,Sc,Sd和Se五段。同时深入探讨了风暴岩的类型,主要包括原地风暴岩和异地风暴岩,并论述了其研究意义。风暴岩是湖泊发育的典型标志,所以风暴岩的提出对确定研究区的沉积相类型增加了新的认识,并且对上二叠统石千峰组的古地理恢复也具有重要意义。

The Upper Permian Shiqianfeng Formation in the Dengfeng region, Henan is mainly composed of the lacustrine clastic rocks in which the tempestites are well developed. These tempestites have the features of sedimentary structures including scour surface, hummocky cross-beddings, convolute beddings, ripple beddings and water-escape structures. The idealized sedimentary sequences of the tempestites are generalized and consist, from bottom to top, of the intervals Sa, Sb, Sc, Sd and Se. The types of the tempestites include autochthonous and allochthonous tempestites, indicating a typical lacustrine environment. The identification of the tempestites in the study area has an important significance for the recognition of sedimentary facies and reconstruction of the palaeogeographic environments of the Upper Permian Shiqianfeng Formation in the Dengfeng region, Henan.