环渤海地区非金属矿地质特征

环渤海地区非金属矿产品种繁多、分布广泛、资源丰富、经济效益明显。区内已发现非金属矿种近80种，已探明小型以上矿产地1294个（其中超大型矿床22个，大型矿床232个，中型矿床497个）。其中菱镁矿、金刚石、滑石、硼、耐火黏土、玉石、硅灰石、石墨、硫、磷、石膏、珍珠岩、澎润土和芒硝等是本区的优势矿产，已探明小型以上矿产地436个。这些矿产主要分布在胶辽、鲁西、燕山、太行山-吕梁山和内蒙古等地。单矿种区域分布极不均匀，如硼矿床、菱镁矿床集中分布于辽东地区，金刚石集中分布于鲁西和辽南地区。此外辽宁、河北、天津、山东还是我国北方海盐的主要产区。该类矿床成因有风化型、沉积岩型、变质岩型、热液型、岩浆岩型等五大类，其形成时代自太古代始，各个地质时代都有产出。

Geological Characteristics of the Nonmetal Deposits in Circum-Bohai-Sea Region

Abundant normetal ores widely spread in Circum-Bohai-Sea Region.About 80 catigories nonmetal ore have been found.1 294 normetal deposits including 22 supper large ores,232 large ones,497 middle ones have been explored.Magnesite,diamond,talc,boron,jade,rivaite,graphite,sulphur,phosphorus,gyps,pearlite,bentonite and glauber salt are advantageous ores,which mainly distribute in Jiaoliao,Luxi(west of Shandong),Yanshan,Taihang-Luliang mountains and Inner Mongolia autonomous region.Liaoning,Hebei,Shandong province,Tianjin has predominant sea salt producting areas in north China.The nonmetal ores can be divided into 5 genetic types:weathering,sedimentary,metamorphic,hydrothermal and magmatic types.The ore formation is in every geological era,and mainly in Palaeozoic.