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杨家坪剖面位于湖南省石门县壶瓶山镇.自从1980年以来,该剖面得到了深入的研究.然而,关于渫水河组形成的古气候环境一直存在争议.通过对渫水河组沉积的碎屑岩的化学成分分析,表明渫水河组与其上覆的古城组(又称东山峰组)和南沱组的冰成岩石具有相似的CIA(化学蚀变指数)和CIW(化学风化指数)值.这意味着渫水河组和南沱组、古城组的沉积岩在沉积前具有相近的低等化学风化程度.因此,渫水河组也可能是在寒冷气候环境下形成的,属于冰期记录的一部分.
The Yangjiaping section is located in Hupingshan Town, Shimen County, Hunan Province and has been studied in depth since 1980. However, paleoclimatic conditions have been controversial over the formation of the Huangshuihe Formation.According to the sedimentary detritus The chemical composition analysis of rocks shows that the CIA (chemical alteration index) and CIW (chemical weathering index) values of the Huangshuihe Formation are similar to those of the overlying Gucheng Formation (also known as Dongshanfeng Formation) and the Nantuo Formation. .This means that the sedimentary rocks of the Huangshuihe Formation and the Nantuo Formation and the Gucheng Formation had similar low chemical weathering degree before sedimentation, therefore, the Huangshuihe Formation may also be formed under the cold climatic conditions and belongs to the record of glacial period Part.