摘要
准噶尔盆地西北缘风城地区发现陆相湖盆白云质岩，其白云石含量为15％～80％，平均含量24％，与典型白云岩在岩石成分和成因机制上存在较大的差异。通过白云质岩的岩矿特征、古生物特征及地球化学特征的研究，认为风城组的白云石形成于较高盐度、高镁钙质量比、强还原的沉积环境，纹层状白云质岩形成于准同生期；夏子街组、乌尔禾组白云石镁离子来源于深部热液，由热液中的镁离子对早期碳酸盐胶结物中的钙离子的交代作用而形成。
The terrestrial lacustrine dolomite with dolomite content ranging from 15%~80% anti 24% in average was found in Fengeheug area in northwestern margin of Junggar basin, which belongs to dolomitie rock or dolomite-contained rock. being greatly different from the typical dolomite in rock composition and genetic mechanism. Based on the ruck-mineral, paleontological and geochemical characteristics of the dolomitie rocks, it is suggested that the dolomite of the Fengcheng formation was formed in the sedimentary envirnnment with high salinity, high Mg/Ca ratio and strong reduetion. The laminated dolomite was formed in the penecontemporaneous period： while the dolo- mites in Xiazijie formatin and Wuerhe formation were formed by the fact that their magnesium ions were originaled from the deep hydro- therm anti the metasomatism caused with ealeium ion in the early carbonate cements.
出处
《新疆石油地质》
CAS
CSCD
北大核心
2013年第5期542-544,共3页
Xinjiang Petroleum Geology
