黄山山体的演化过程研究

本文指出黄山区褶皱运动不是在印支放因而是在燕山旋回中期，与黄山花岗岩浆侵入同步，发生子１２５Ｍａ左右．花岗岩体经长期缓慢上升和剥蚀作用于距今３０Ｍａ（渐新世中期）时形成了黄山顶部光明顶期夷平面．距今５Ｍａ（上新世）时形成了黄山第二层地貌面－老人峰期剥蚀面．第四纪初（距今约２．５Ｍａ）的喜马拉雅旋国第三幕时，该区花岗岩体呈断块大幅度抬升，使现代的黄山正处于青年期中山峡谷阶段．依据地貌特征、堆积物分析、孢子花粉组合、气候特征以及山顶上奇峰巧石等证据，表明黄山第四纪时期没有经历过冰川作用，黄山顶部仅遭受了寒冻作用．

Evolutional Process of Geomorphology at Mt. Huangshan

The new results of 39Ar/40Ar dating aged showed that the magmatic intrusions of Taiping Granit and Huangthen Granit are in 137 Ma and 125 Ma, respectively. The Period of folding movement and the magmatic intruSions were synchronous in the Middle Yenshan Orogeny, Early Creataceous(K1). The highest dedudetional plane at Mt. Huangshan top lies 1600-1800m a. s. 1. and theformed Period of the plane is called Bright Summit stage by author The plane was formed in 30 MaB. P.(E3), after Early Himalayan Movement. The second dedudational plane with lower mounts and wide valleys lies between 1200-1500m a. s. 1. and formed during the Old Man Peak Stage about 5Ma(N2). The uplifting Huangshan Granite massif and the plane of Old-Man Stage have been downcutted by streams to forming middle mounts and canyons of young stage in the present erosion cycle in Quaternary.J. S. Lee(1936) proposed that glacial cirques, U-shape valleys and terminal morains are truly the depressions of converged flows at dedudational plane of the Bright Summit Stage,wide valleys at Second plane of the Old-Man Pack Stage and sediments of pluvial fans at piedments, respectively. The spore-pollen assemblages in the called "morains"(by Lee)show that when the vegetation was a subtropical forest. It can be seen that the Quaternary glaciations had never developed at Mt. Huangshan.