The magnesite deposit in Liaoning Province, tectonically located in the southeast margin of the Meso-Neoproterozoic Fanhe rift and the north margin of Archean Fushun-Qingyuan craton, is composed of four individual ore bodies trending east-west, among which the Tongjiajie orebody is the largest. The deposit occurs in the aplite-dolomite of the 4th member of Gaoyuzhuang formation, Changcheng system, Mesoproterozoic. In the geological survey to the Tongjiajie magnesite deposit, the metallogenic background and geologic characteristics of the orebody, as well as the ancient sea water, paleoclimate and paleogeography, are studied and analyzed. The genesis of the deposit is considered to be of sedimentation, with the reformation by metamorphic recrystallization and metamorphic hydrothermal fluid.%辽北地区菱镁矿床位于中新元古代凡河裂谷东南边缘及太古宙抚顺-清原克拉通北部边缘,由4个独立矿体组成,东西向展布,尤以佟家街矿体规模最大.矿床赋存于中元古界长城系高于庄组四段细晶白云岩中.在对佟家街菱镁矿床的补充普查工作中,通过对成矿地质背景、矿体地质特征及古海水、古气候、古地理位置的研究分析,提出以沉积为主,变质重结晶、变生热液改造为辅的矿床成因模式.
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