三门海滩岩基本特征及保护对策初探

A Preliminary Study on the Basic Characteristics and Protection Measures of Sanmen Beach Rock

海滩岩研究已经成为一个多学科、综合性的领域,对于认识地球的演化过程和提高地球资源的利用价值具有重要的意义。本文通过对三门沿赤海滩岩取得的手标本采用物性扫描、显微镜观测、XRD矿物组成分析等方法得到了其形貌特征和矿物组成,进而分析了其沉积环境特点,并提出初步的保护对策。本次研究发现三门海滩岩受人类活动和自然界外力破坏交严重;样品孔隙度均在29%以上,主要由花岗岩角砾(石英 + 斜长石 + 钾长石)胶结生物碎屑(方解石)组成,说明三门海滩岩形成时水动力作用较强,可能产生于灾变环境,同时也表明三门海滩岩亟待保护。本研究结果对浙江省乃至全国的海滩岩研究和保护提供一点借鉴意义。

The research of beach rock has become a multi-disciplinary and comprehensive field, which is of great significance for understanding the evolution process of the earth and improving the utilization value of the earth resources. In this paper, physi-cal scanning and microscopic observation are used to analyze the morphologic characteristics and mineral composition of the bid sample obtained along Chidatan roc in Sanmen, so as to further ana-lyze the characteristics of its sedimentary environment and put forward preliminary protection measures. This study found that Sanmen beach rock was seriously damaged by human activities and external forces of nature. The sample porosity is above 29%, mainly composed of granitic brec-cia (quartz + plagioclase + potassium feldspar) cemented bioclasts (calcite). This indicates that the formation of Sanmen beach rock has a strong hydrodynamic effect, which may be generated in a catastrophic environment. It also indicates that Sanmen beach Rock is in urgent need of protection. The results of this study provide some reference for the study and protection of beach rock in Zhejiang Province and even the whole country.