南昌市梅岭花岗岩石蛋地貌的特征与发育机制初探

发布时间：2018-06-08 08:26

本文选题：梅岭 + 裸露型石蛋　；参考：《地质论评》2017年05期

【摘要】：梅岭主要以新元古代花岗岩为地质基础,在长期的构造抬升和风化侵蚀作用下,形成了以垄状山脊/锯状山脊和侵蚀沟谷为组合的地貌特征,其代表性地貌为大小不同和圆度各异的石块堆积,广泛分布于山顶、山谷和缓山坡上,对于其形成机制,过去常被认为是冰川遗迹或倒石堆。通过研究这些石块堆积的形态特征和分布规律,笔者认为属石蛋地貌,可分为裸露型石蛋地貌和埋藏型石蛋地貌。二者的广泛分布,表明梅岭处于花岗岩地貌演化的幼年期晚期—青年期早期阶段,发育机制与当地的地质构造背景和湿热气候环境密切相关,其中的裸露型石蛋主要与埋藏型石蛋剥露、裸露岩石的球状风化和倒石堆的球状风化有关,沟谷中的石蛋流主要形成于裸露岩石崩解破碎后顺坡滚动、土体崩塌导致埋藏型石蛋出露和顺坡滚动、洪水搬运、季节性冻融作用使岩石顺坡蠕动等方式的综合作用下。埋藏型石蛋主要是在花岗岩内部裂隙和节理的控制下,形成于温度和降水对不同深度花岗岩的差异性风化作用。
[Abstract]:Meiling, mainly based on Neoproterozoic granites, formed the geomorphological features of ridge-like ridge / sawlike ridge and erosion gully under the long-term tectonic uplift and weathering erosion. The typical geomorphology is the accumulation of rocks with different sizes and roundness, which is widely distributed on the hilltops, valleys and gentle hillsides. The formation mechanism of these rocks was often considered as glacial remains or toppling rocks. By studying the morphological characteristics and distribution of these rocks, the author thinks that they belong to stone and egg landforms, which can be divided into bare stone egg landforms and buried stone egg landforms. The widespread distribution of the two suggests that Meiling is in the late infancy and early adolescence of the evolution of granite landforms, and the development mechanism is closely related to the local geological tectonic setting and the humid and thermal climatic environment. The bare type of stone eggs are mainly related to the burial type of stone eggs peeling, the spherical weathering of exposed rocks and the spherical weathering of toppled rocks, and the flow of stone eggs in the gully is mainly formed when the exposed rocks are broken down and rolled along the slope. The collapse of the soil resulted in the burial type of stone eggs exposed and rolling along the slope, flood transport, seasonal freezing and thawing, rock creep along the slope and so on. The buried stone eggs are mainly formed under the control of the internal cracks and joints of the granite and are formed by the differential weathering of the different depth granite caused by temperature and precipitation.
【作者单位】：江西省数字国土重点实验室;东华理工大学地球科学学院;
【基金】：国家自然科学基金资助项目(编号:41571007) 江西省数字国土重点实验室开放基金资助项目(编号:DLLJ201511) 东华理工大学地质资源经济与管理研究中心开放基金资助项目(编号:14JC01) 梅岭地质灾害实习基地建设项目的成果~~
【分类号】：P588.121;P931

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