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中文摘要：
会理—东川地区是上扬子陆块出露中元古界地层最广泛的地区。以菜子园—麻塘东西向断裂带为界,之北为会理群,之南为汤丹群、东川群,断裂带内为通安组五段。均为一套浅变质的沉积岩夹火山岩。笔者等通过沉积学、火山岩岩石学和同位素地质年代学综合研究,认为中元古代（1800～1650Ma）堆积了一套偏碱性细碧角斑岩和火山—沉积碎屑岩建造的河口群,形成了近东西向的裂谷盆地。东川群大致相当于Calymmian期,其黑山组中凝灰岩锆石SHRIMP年龄为1503±17Ma,形成于被动陆缘的伸展环境;会理群大致相当于Stenian期,具陆缘—岛弧型火山岩组合特征。通安组五段为裂谷—深海型沉积。会理群、东川群形成不同时代、不同环境下的两套产物,在新元古代以前分属不同的两个块体,不能加以简单的对比。二者应该以菜子园—麻塘断裂带为界,保持相对独立。
英文摘要：
In the upper Yangtze block,the Mesoproterozoic most widely outcropped in the Huili—Dongchuan area.Being divided by a east—west direction extentional fault,Caiziyuan—Matang fault,the Huili Group is on the north side,and Tangdan Group,Dongchuan Group are on the south side,and in the fault belt is the 5th Member of the Tong＇an Formation.All of them are epimetamorphic sedimentary rocks with interbeds of volcanic rocks.Based on synthetic research in sedimentology,volcanic petrology and isotopic chronology,writers finger out that a east—west directional rift basin formed in Mesoproterozoic（1800～1650Ma）,in which acumulated the Hekou Group,composed of metalkaline spilitic—keratophyre and pyroclastic sedimentary rock formation.The time of the Dongchuan Group is Calymmian,the zircons from tuff in the Heishan Formation of which give out a SHRIMP U-Pb age of 1503±17Ma,formed in extensional environment in passive continental margin.The time of the Huili Group is about Stenian,has volcanic assemblage characteristics of continental margin—island-arc.The 5th Member of the Tong＇an Formation is rift—deep sea sedimentation.So the Huili Group and the Dongchuan Group formed in different time and different environment,were individual before Neoproterozoic;the Caiziyuan—Matang fault could be considered as their boundary to keep their independence.
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