山东沂南徐公砚石矿床地质特征及成因浅析

Geological Characteristics and Formation Origin of Xugong Inkstone Deposit in Yi'nan County in Shandong Province

摘要:

山东沂南徐公砚历史悠久，具有较高的历史文化价值。本文基于形成的矿床地质数据、岩矿鉴定、测试结果等，通过对徐公砚石岩石学、矿物学、岩石化学等特征的研究，对其成因进行了分析，取得了以下主要认识：徐公砚石矿赋存于新元古代土门群佟家庄组页岩段中，岩性为薄层状—透镜状微晶灰岩，时代、层位、岩相古地理等因素影响显著，形成于半深海环境，受后期溶蚀作用制约，为沉积型层控矿床；依据花芽发育情况、石质、块度、厚度、色差等，将研究区砚石共划分为两大色系、四个品级。研究成果可为将来徐公砚开发利用和保护提供科学依据。

Abstract:

Xugong inkstone in Yinan city in Shandong province has a long history and cultural value. Based on geological data, rock mineral identification and test results of the formed deposit, the formation origin of Xugong inkstone has been analyzed through the study on its petrological and mineralogical and geochemical characteristics. It is regarded that Xugong inkstone deposit is embedded in the shale member of Tongjiazhuang formation in Neoproterozoic Tumen group. The lithology is thin layer lenticular microcrystalline limestone, which is significantly affected by age, horizon, lithofacies and paleogeography. It is formed in bathyal environment and restricted by later dissolution. It is a sedimentary stratabound deposit. According to the development of flower bud, stone quality, lumpiness, and color difference, Xugong inkstones in the study area are divided into two color systems and four grades.The research results can provide a scientific basis for the development,utilization and protection of Xugong inkstone in the future.