南昌市梅岭地区“花岗岩石蛋”地貌成因  

Geomorphological Genesis of"Granite Eggs"in Meiling Area,Nanchang City,China

作　　者：赵月 陈春玉 倪凤娟 张雪 秦澳 朱素雯 陈高雨 齐含冀 ZHAO Yue;CHEN Chunyu;Ni Fengjuan;ZHANG Xue;QIN Ao;ZHU Suwen;CHEN Gaoyu;QI Hanji(School of Geosciences,Donghua University of Science and Technology,Nanchang,Jiangxi330013;State Key Laboratory of Nuclear Resources and Environment,Donghua University of Science and Technology,Nanchang,Jiangxi330013;Sichuan Province Natural Resources Investment Group Panzhiuhua West Co.,Ltd,Chengdu,Sichuan 610065)

机构地区：[1]东华理工大学地球科学学院,南昌330013 [2]东华理工大学核资源与环境国家重点实验室,南昌330013 [3]四川省自然资源投资集团攀西有限责任公司,四川西昌615000

出　　处：《四川地质学报》2025年第1期30-39,共10页Acta Geologica Sichuan

摘　　要：该研究旨在深入剖析梅岭地区花岗岩地貌的成因,特别是关注该地区南西侧广泛分布的花岗闪长岩巨型砾石堆的形成机制。通过野外实地调研,发现梅岭南西侧发育大量花岗闪长岩巨型砾石堆,出露面积约20km^(2)。这些花岗闪长岩砾石呈4∶1到2∶1的长短轴比,粒径在0.5~5 m间,大小不一。部分岩石棱角分明,磨圆度很差。其形态多样,大多为扁平、长条状或方状的石头。且表皮新鲜,无明显层状剥离特征。岩石表面还呈现摩擦或刻划的痕迹;在山体低平部位和远离山体的第四纪松散堆积物中,我们还观察到大小混杂、长短各异、分选性差的无定向排列的岩块。结合中国东部第四纪冰川作用的影响范围及冰川砾石的特征,认为梅岭地区的巨型花岗闪长岩砾石堆可能与第四纪冰川事件有关。这一研究成果对于理解梅岭地区花岗岩石蛋的成因具有重要的参考价值。The purpose of this study is to deeply analyze the genesis of granite landform in Meiling area,especially the formation mechanism of granodiorite giant gravel piles widely distributed on the southwest side of this area.Based on field investigation,it is found that a large number of granodiorite giant gravel piles developed on the southwest side of Meiling,with an exposed area of about 20 km^(2).These granodiorite gravels have an axial ratio of 4∶1 to 2∶1,with particle sizes ranging from 0.5 to 5 m.Some of the rocks are angular and poorly rounded.It has a variety of forms,mostly flat,long or square stones.The epidermis is fresh and has no obvious lamellar peeling characteristics.The rock surface also shows signs of friction or scratching.In the lower part of the mountain and the Quaternary loose deposits far away from the mountain,the rocks with different sizes,different lengths and poor sorting were observed.Combined with the influence range of Quaternary glaciation in eastern China and the characteristics of glacial gravel,it is suggested that the giant granodiorite gravel piles in Meiling area may be related to Quaternary glacial events,which has important reference value for understanding the genesis of granite eggs in Meiling area.

关 键 词：第四纪冰川作用 冰碛物 南昌梅岭 形成机制 

分 类 号：P581[天文地球—岩石学]