古元古代δ^(13)Ccarb正向漂移事件:2.3Ga环境突变研究的进展  

PALEOPROTOEROZOIC δ^(13)C_(carb) POSITIVE EXCURSION EVENT: RESEARCH PROGRESS ON 2.3 Ga CATASTROPHE

作　　者：唐国军[1] 陈衍景[1] 黄宝玲[1] 陈从喜[1] 

机构地区：[1]北京大学造山带与地壳演化实验室北京大学地质学系,北京100871

出　　处：《矿物岩石》2004年第3期103-109,共7页Mineralogy and Petrology

基　　金：国家自然科学基金项目40373007号的部分成果

摘　　要：　2.33Ga～2.06Ga的δ13Ccarb正向漂移事件已被确认为一次全球性事件。与之相伴,地球表层系统的性质发生了一系列变革性变化,证实了2.3Ga环境突变事件的客观存在。关于事件的起因,科学家提出了"雪球"效应、超级地幔柱活动/超级大陆裂解效应、地外撞击事件等多种可能,但均需进一步确定。δ13Ccarb正向漂移现象很可能会在更多地区发现,2.3Ga前后多方面的截然变化将被揭示,更多示踪手段将被运用于研究2.3Ga事件。δ^(13)C_(carb) positive excursion event between 2.33 Ga^2.06 Ga has been identified as a global event, which confirms the view that an environmental catastrophe in earth′s surficial system occurred at about 2.3 Ga. To probe the cause of this global event, scientists have proposed several possibilities such as ″snowball earth″,super-mantle plume and/or supercontinent breakup, and extraterrestrial impact. Clearly, these hypotheses should be verified by more data in future studies. Therefore, we consider that δ^(13)C_(carb) positive excursion phenomenon will be found in more regions, changes in other aspects around 2.3 Ga boundary will be revealed, and new indicators will be used to trace the 2.3 Ga event.

关 键 词：古元古代 δ^13Ccarb正向漂移事件 环境突变 2.3Ga 

分 类 号：P597.2[天文地球—地球化学] P534.3[天文地球—地质学]