华南元古宙地壳演变过程研究中的几点进展

THE NEW RESEARCHING RESULTS IN PROTEROZOIC CRUSTAL EVOLUTIONARY PROCESS OF SOUTH CHINA

根据近两年对华南元古宙地壳演变过程的研究，提出了华南基底构造格架的划分方案；同时发现了华南陆下存在相对稳定高速高阻冷的古地幔柱的残留部分一“残烃柱”；指出华南古大洋基底蛇绿岩层序中存在斜长花岗岩等酸性组分；探讨了陆下地幔新矿物相；初步建立了华南及西太平洋壳一幔分层柱体模型；讨论了华南部分地区下地壳及上地幔的岩石流变学特征。对元古宙Cu、Au等成矿作用也作了初步的总结并提出了有希望的成矿远景区。

築ased on recent two years' study of Proterozoic crustal evolutionary process of SouthChina, the authors gave a classification of basal tectonic ftamwork in South China and dis-covered 'residual hydrocarbon column' -- a cold residual mantle with relative stablehigh-velocity and high-resistivity existing under the South China continent' During thestudy on crust evolution, some researching results were made acidic components inophioite sequences of paleo-oceanic basement, such as plagiogranite and so on, occurred inSouth China' Some new mineral facies were also discussed in subcontinent mantle- Thecharacteristics of rock rheology were studied in the lower crust and upper mantle. Strati-fied columnar model of crust-mantle was preliminarily established in South China and WestPacific Ocean- According to the above mentioned, the authors summarized the copper andgold mineralization of the Proterozoic and put forward some metallogenetic potential areasin South China.