山东省石灰岩成矿规律及找矿方向

Metallogenic Regularity and Prospecting Direction of Limestone in Shandong Province

摘要:

山东省石灰岩矿产地分布于9个地市45个县（区、市），其中，济南市28处、济宁市24处、枣庄市26处、临沂市21处、淄博市21处、泰安市15处、潍坊市12处、烟台市7处、日照市3处。已发现石灰岩矿床157处，资源储量大。山东省内石灰岩含矿层位多，出露范围广泛。不同成矿作用生成的石灰岩矿床主要赋存于奥陶纪马家沟群八陡组、五阳山组、北庵庄组；寒武奥陶纪九龙群张夏组；震旦纪蓬莱群香夼组，这些矿床属于浅海相碳酸盐岩含矿沉积建造。矿床类型为：海相化学沉积型、海相机械沉积型和海相生物沉积型，其中主要为海相化学沉积型。山东省产出的石灰岩新鲜面颜色呈黑色和灰色,隐晶质结构,块状构造。岩石主要矿物为方解石,少量白云石、黏土矿物和石英等。其中奥陶纪马家沟群中的块状石灰岩的化学成分比较稳定、质量省内最佳，CaO含量比较高，一般为50%～55%，最高达56%。炒米店组石灰岩含矿率较高，一般为70%（水泥用）、90%（建筑石料用）；崮山组石灰岩含矿率最低。石灰岩矿石类型划分为块状（泥晶）、鲕粒状、豹皮状、竹叶状、条带状、角砾状和叠层石等7种。本文总结了山东省石灰岩矿的岩石矿物学特征及成矿规律，明确了山东省石灰岩矿的找矿方向。

Abstract:

The limestone mining areas in Shandong province are distributed in 45 counties across 9 cities, including 28 in Ji'nan, 24 in Ji'ning, 26 in Zaozhuang, 21 in Linyi, 21 in Zibo, 15 in Tai'an, 12 in Weifang, 7 in Yantai and 3 in Rizhao. 157 limestone deposits have been discovered with significant resource reserves. There are many mineral bearing layers in limestone within the province, with a wide range of exposed areas. Limestone deposits generated by different mineralization processes mainly occur in the Ordovician Majiagou Group Badou Formation, Wuyangshan Formation, and Bei'anzhuang Formation; Cambrian Ordovician Jiulong Group Zhangxia Formation; The Xiangqian Formation of the Penglai Group in the Sinian period belongs to the shallow marine carbonate sedimentary formation. The types of mineral deposits are: marine chemical sedimentary type, marine mechanical sedimentary type, and marine biological sedimentary type, among which the main type is marine chemical sedimentary type. The fresh surface color of limestone produced in Shandong Province is black and gray, with cryptocrystalline structure and blocky structure. The main minerals in the rock are calcite, with a small amount of dolomite, clay minerals, and quartz. The chemical composition of the blocky limestone in the Ordovician Majiagou Group is relatively stable and of the best quality in the province. The CaO content is relatively high, generally ranging from 50% to 55%, with the highest reaching 56%. The limestone ore content in the fried rice shop group is relatively high, generally 70% (for cement) and 90% (for building stone); The Gushan Formation limestone has the lowest mineral content. The types of limestone ore are divided into seven categories: blocky (mud crystal), oolitic, leopard skin, bamboo leaf, banded, angular gravel, and layered stone. This article summarizes the mineralogical characteristics and mineralization laws of limestone deposits in Shandong Province, and clarifies the prospecting direction for limestone deposits in Shandong Province.