崂山天然石臼成因与花岗岩晶洞关系研究

The academic debate on Quaternary glaciation in East China is one of the hot issues of the Quaternary geology research in China. The debate is focusing on the formation of micro-landform what are called "glacial pothole"and "none-glacial pothole". Some scholars take the natural-mortar as classic "glacial pothole" .We found that the rocks of Mount Laoshan belong to miarolitic granites from our investigations. There existed big and small caves all the time which were called miarolitic caves(some did not develop crystal and they were called bubble-like cave);the natural-mortar of Mount Laoshan were formed after the bigger miarolitic caves (bubble-like cave) were damaged along the joints and exposed to the air or reconstructed from smaller miarolitic caves (bubble-like cave) .This discovery supplies a new model to discuss the formation of natural-mortar .We plan to research on the relationship between miarolitic cave (bubble-like cave) and natural-mortar by use of field survey ,detailed observation ,analysis of petrology ,mineralogy and geochemistry and microscopic identification of cave. In the meantime , we will study the development characteristics of granite miarolitic cave (bubble-like cave) and natural-mortar in East China deeply .The project will solve the problem that whether there is universality in the formation of granite miarolitic cave and natural-mortar and offer new ideas for the academic discussion on Quaternary glaciation in East China .

中国东部第四纪冰川的学术争论是我国第四纪地质学研究的热点问题之一。目前争论的焦点集中在所谓 "冰臼"和"非冰臼"的微地貌成因上。有些学者把崂山的天然石臼视为典型"冰臼"。我们多次考察发现，崂山岩石属于"晶洞花岗"，本身就存在大大小小的原生洞穴-晶洞（其中有的没有发育晶体，可以称为气泡洞）；崂山天然石臼是较大晶洞（气泡洞）沿节理破坏后暴露出来形成的，或者是在小的晶洞（气泡洞）基础上风化改造形成的。这一发现为探讨天然石臼成因，提供了一个新的模式。本项目拟采用野外现场考察与详细观测，并借助岩石学、矿物学和地球化学等分析测试，及穴壁形态微观鉴定等手段，进一步深入探讨晶洞（气泡洞）和天然石臼的关系。同时，深入研究我国东部地区花岗岩晶洞（气泡洞）和天然石臼的发育特征，解决花岗岩气泡洞与天然石臼成因上是否存在普遍性的问题，为我国东部地区第四纪冰川的学术争论提供新的见解。

中国东部第四纪冰川的学术争论是我国第四纪地质学研究的热点问题之一。目前争论的焦点集中在所谓 “冰臼”和“非冰臼”的微地貌成因上。有些学者把崂山的天然石臼视为典型“冰臼”。本项目以青岛崂山花岗岩天然石臼和大型气泡状洞穴的形态特征、洞壁微观特征以及崂山花岗岩微地貌形成影响因素及演化为研究对象。通过岩石学、矿物学和地球化学的研究，确定崂山天然石臼是较大晶洞（气泡状洞穴）沿节理破坏后暴露出来形成的，或者是在小的晶洞（气泡状洞穴）基础上风化改造形成的。通过岩石硬度与岩石地球化学综合研究，判定石臼和大型气泡状洞穴表面风化程度，揭示出大型气泡状洞穴的原生性。综合考虑岩性、节理、气候等因素，确定崂山花岗岩微地貌形成和演化的影响因素，厘定出崂山花岗岩微地貌的演化阶段。本研究揭示出崂山天然石臼的真正成因，为我国东部地区第四纪冰川的学术争论提供新的解释。本研究也肯定了洞穴学的一种新的成因类型—“花岗岩气泡洞”。花岗岩气泡洞是珍稀的地质遗迹，具有较高的观赏、科普和旅游价值。