沉积与特提斯地质2012，Vol.32Issue(3)：31-40,10.
哥伦比亚超大陆在扬子陆块西缘的探秘
Columbia supercontinent: New insights from the western margin of the Yangtze landmass
摘要
Abstract
Three suites of epimetamorphic rock series dated at 1.6-18 Ga ( Statherian of the Palaeoproterozoic) are cropped out in the Lala, Xiaoguanhe-Dongchuan and Dahongshan areas on the western margin of the Yangtze landmass, named the Hekou Group, Tong'an Formation-Tangdan Group-Dongchuan Group, and Dahongshan Group, respectively. The evolution of geologic history of the above-mentioned rock series from 2. 0 Ga to 1.4 Ga went through; ( 1) orogenic movements at ca. 2. 2 - 1. 8 Ga; (2) anorogenic splitting event groups at ca. 1.7-1.5 Ga; (3) penetrating of basic dike swarms and stratified intrusions into the Palaeoproterozoic strata at ca. 1.7 - 1.5 Ga; (4) shelf rifting events in the Yinmin-Luoxue zone at ca. 1.5 -1.2 Ga, and (5) collision-orogenic events on the western margin of the upper Yangtze landmass around 1. 0 Ga. The emphasis in the present paper focuses on the nature, characteristics and isotopic dating data for the 1.8 -1.6 Ga pervasive shelf rifting events on the western margin of the Yangtze landmass, which may well be compared with the nature, characteristics and age determinations for North China, North America, Siberia and Northwest Europe, and thus have provided evidences in favour of the unity of the Yangtze landmass with other continental masses during the Palaeoproterozoic.关键词
扬子陆块西缘/哥伦比亚超大陆/古元古代/汇聚与裂解Key words
western margin of the Yangtze landmass/ Columbia supercontinent/ Palaeoproterozoic/ assembly and breakup分类
天文与地球科学引用本文复制引用
尹福光,王冬兵,孙志明,任光明,庞维华..哥伦比亚超大陆在扬子陆块西缘的探秘[J].沉积与特提斯地质,2012,32(3):31-40,10.基金项目
本文为国家973项目(编号:2009CB421003)、中国地质调查局地质调查项目(编号:1212010610213、1212011121110)及国家自然科学基金项目(编号:40773001)共同资助的成果 （编号:2009CB421003）
