摘要
概略评述了 1997年以来国际上有关 Rodinia超大陆构造演化问题的研究成果 ,并提出今后工作的主要目标。 Rodinia超大陆的聚合造山发生在 130 0～ 10 0 0 Ma,基本形式表现为早期弧—陆碰撞和晚期陆—陆碰撞 ,并在 10 0 0～ 90 0 Ma继以伸展作用。Rodinia超大陆的裂解发生于 830 Ma之后 ,但其过程具有明显的时、空分布不均一性。地幔柱可能是导致超大陆裂解的主要机制 ,“大火成岩省”是表明地幔柱发育的关键性标志。已经初步证实裂解过程影响地球大气圈和水圈中二氧化碳的循环 ,进而改变晚前寒武纪的全球气候 ,控制生物圈的兴衰和岩石圈表层的碳酸盐、铁、锰和磷等沉积。这些现象可用“雪球化地球”( SnowballEarth)
The researches on Rodinia since 1997 have been reviewed and the main goals for further study have been suggested in this paper. Rodinia supercontinent is a supercontinent formed by the aggregation of global blocks during the Neoproterozoic. The aggregation occurred between 1000 and 1300 Ma, characterized by the early arc-continent and late continent-continent collisions followed by an extension between 900 and 1000 Ma. The breakup of the supercontinent occurred after 830 Ma but it was not homogeneous in time and space. It has been inferred that the mantle plume was a main machine to have resulted in this breakup. The 'great igneous province' can be used as the key evidence for the development of the plume. It has been preliminarily proved that the breakup process influenced the CO2 cycle in the atmosphere and hydrosphere, which changed the Neoproterozoic global climate and controlled the development of biosphere and sedimentation of CaCO3, Fe, Mn and P in surface layers of the lithosphere. These phenomena can been explained by the Snowball Earth model.
出处
《地质科技情报》
EI
CAS
CSCD
北大核心
2001年第1期15-19,共5页
Geological Science and Technology Information
基金
国家自然科学基金重点资助项目! ( 40 0 32 0 10 )
