Rodinia超大陆旋回与华南新元古代成锰作用

The Rodinia Supercontinent Cycle and Manganese Deposit Mineralization of Neoproterozoic in South China Continental

中—新元古代,华南陆块新元古代南华纪地层中所形成的锰矿床大多集中在700 Ma左右,与Rodinia超大陆全面裂解时期一致。锰矿的成矿作用与晋宁运动后华南陆块大规模裂解事件密切相关,显示构造环境由挤压向拉伸的转变,这正是全球Rodinia超大陆裂解的表现形式。从同位素地质年代学、大地构造、沉积环境方面探讨了该时期的成锰作用,认为其与Rodinia超大陆旋回事件的关系密切。研究区的锰矿探矿工作可以沿Rodinia超大陆裂解时期华南陆块形成的一系列裂陷槽及同沉积盆地开展,为锰矿的找矿工作提供了思路。

Meso-Neoproterozoic,The manganese deposit of neoproterozoic strata in South China continental be formed mostly concentrated about 700 Ma,with the Rodinia supercontinent cracking period.The formation of these manganese deposits and the jinning movement of south China continental block mass cracking events are closely related,according to tectonic environment by extrusion to stretch,this is global Rodinia supercontinent cracking forms. This article discuss the relationship between isotopic geochronology, tectonic and sedimentary environment in the period of a manganese with Rodinia supercontinent cycle of events.Provides a train of thought for the manganese ore prospecting work,manganesedeposit prospecting work in the study area can be along the Rodinia supercontinent cracking period of south China continental blocks to form a series of chasmic trough and carried out with the sedimentary basin.