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华北克拉通中元古代长城系盖层广泛分布,其沉积时代和物质来源对于华北克拉通前寒武纪地壳演化研究具有重要意义.本文报道了北京十三陵地区华北克拉通长城系盖层碎屑沉积岩碎屑锆石年龄分布模式。样品为长城系下部常州沟组含长石石英砂岩(CHc-2)和石英砂岩(CHc-9)。碎屑锆石年龄主要分布在2.35～2.60 Ga之间,靠上部层位(CHc-9)还有一定数量1.9～1.8 Ga和2.1～2.3 Ga碎屑锆石存在。研究表明,碎屑沉积物来自以约2.5 Ga陆壳物质为主的华北克拉通物源区,1.9～1.8 Ga为华北克拉通古元古代哥伦比亚超大陆陆-陆碰撞构造热事件响应的年龄,长城系盖层最大沉积年龄小于1.8 Ga。
The Paleoproterozoic Great Wall of the North China Craton is widely distributed and its sedimentary age and material source are of great significance for the study of the Precambrian crustal evolution in the North China Craton.The paper reports the crustal crushing of the North China Craton Great Wall in the Ming Tombs Age distribution patterns of detrital zircon detritus. The samples are Changchigou Formation containing Changchu quartz sandstone (CHc-2) and quartz sandstone (CHc-9) in the lower part of the Great Wall series. The ages of detrital zircons are mainly distributed in the range of 2.35-2.60 Ga, and there are a certain amount of 1.9-1.8 Ga and 2.1-2.3 Ga detrital zircons in the upper layer (CHc-9). The results show that the clastic sediments originated from the North China craton source area dominated by about 2.5 Ga continental crustal materials and 1.9 ~ 1.8 Ga is the age of response to the tectonic thermal event of the Paleo-Proterozoic Columbia continental-continental collision in North China craton. The maximum sedimentary age of the Great Wall is less than 1.8 Ga.