蓟县常州沟组沉积特征及其地质意义  

FLUVIAL FACIES IN THE CHANGZHOUGOU FORMATION IN THE JIXIAN AREA OF CHINA AND GEOLOGICAL SIGNIFICANCE

作　　者：陈贤[1,2] 张传恒[2] 刘家军[1,2] 特古斯 

机构地区：[1]中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学(北京)地球科学与资源学院,北京100083 [3]蒙古人民共和国,乌兰巴托661

出　　处：《地层学杂志》2014年第2期236-244,共9页Journal of Stratigraphy

基　　金：中国地质调查局地质矿产调查评价专项“覆盖区矿产综合预测”(No.1212011085471);国家自然科学基金(No.40973035)资助

摘　　要：蓟县地区长城系常州沟组沉积特征如下:底部河流相砂岩斜层理倾向玫瑰花图指示常州沟早期为近NE古流向,结合常州沟组底部的重矿物分析,反映早期河流相沉积的物源区为沉积区西南部五台古陆和密云—怀柔隆起区;常州沟组碎屑沉积物源主要来自克拉通源区,但再旋回造山隆升蚀源区也提供极少量物源。结合中元古时期区域内张性构造背景下侵入岩体资料证据,燕辽裂陷槽成因属克拉通内部裂解,即属陆内克拉通盆地,而不是裂谷型大陆边缘盆地。但研究区可能处于克拉通与大陆边缘造山带的毗邻地带,因而接受了极少量远距离搬运的再旋回造山隆升蚀源区碎屑。以常州沟组为视角,借助已有成果资料,简要探讨了燕辽裂陷槽演化史,燕辽裂陷槽的演化发展经历了大陆裂谷—坳拉槽阶段,并未过渡到洋盆阶段便克拉通化,是一发育不完全的裂谷。The article presents a sedimentological analysis of the lower Changzhougou Formation sandstone in the Jixian area.Paleocurrent analysis indicates that sediments were sourced the Wutai continent and Miyun-Huairou uplift region to the southwest of the study region.A Dickinson（1979,1983）ternary diagram analysis suggests that sediments were derived from cratonic source areas,with a minor input from multicycle foreland uplift erosion source areas.Combined with the regional and tensional tectonic background of intrusive rocks,the new data indicate that the Yanliao aulacogen was a intracratonic basin.The Yanliao aulacogen may have experienced the early evolutionary stage of a continental rift basin without the development of oceanic crust.

关 键 词：岩石地层 沉积特征 玫瑰花图 物源区类型 燕辽裂陷槽 常州沟组 长城系 蓟县 天津 

分 类 号：P534.3[天文地球—古生物学与地层学]