曲阜柴山水泥用灰岩矿地质特征及矿床成因

Geological Characteristics and the Origin of Chaishan Cement Limestone In Qufu City

摘要:

柴山水泥用灰岩矿矿床位于山东省曲阜市，矿床赋存于寒武纪九龙群张夏组地层中，区内断裂构造较发育，岩浆岩不发育。矿层分布于张夏组下灰岩段、薄层灰岩段和上灰岩段；矿石组分主要为方解石，矿石结构有鲕粒结构、生物碎屑结构、藻屑结构和内碎屑结构等；矿石构造主要有块状构造、云斑构造、叠层状构造等。矿石主要有用组分为CaO,Al2O3,Fe2O3,SiO2;主要有害组分为MgO,K2O,Na2O,fSiO2,SO3,Cl-；矿床平均化学组分CaO：52.02%，MgO：1.31%，矿石质量优良，Ⅰ级品矿石约占矿石总量的99.29%；矿层大部分裸露地表，底板为寒武纪长清群馒头组洪河段砂质灰岩、钙质砂岩等。矿床属海相化学沉积型矿床，矿层产状与地层产状一致，其产出部位明显受地层层位的控制。

Abstract:

Chaishan cement limestone deposit is located in Qufu city of Shandong province. Ore deposit occurs in Zhangxia formation of Cambrian group. Fractural structures developed well in this area, while magmatic rocks is not developed. Deposit strata distributed in lower part of limestone section, thin limestone section and the upper part of limestone section in Zhangxia group. The components are mainly calcite ores. Ore structure are oolitic structure, bioclastic structure, algal crumb structure and inner clastic structure, etc. Ore structures mainly have massive structure, cloudy structure, laminated structure, etc. Main useful mineral components of ores are CaO, Al2O3, Fe2O3, SiO2. Main harmful components are MgO, K2O, Na2O, fSiO2, SO3, Cl-. The average chemical components are as follows: CaO is 52.02% and MgO is 1.31%. Ore quality is good. Ⅰ grade ores account for about 99.29% of the total ores. Ore strata mainly bared on the surface. The floor strta are sandy limestone and calcareous sandstone.of Honghe section in Mantou formation of Cambrian Changqing group. The deposit belongs to marine chemical sedimentary type deposit. Ore occurrence is consistent with the attitude of strata. Its output is significantly controlled by stratigraphic position. Oolitic limestone, thin-layer limestone, cloudy limestone and algal limestone are favorable prospecting marks.