Reconstracted ocean floor cross-section during Archean to Proterozoic

为了了解中太古代-古元古代洋底环境，我们做了以下四个专题。1)3.2Ga DXCL钻探项目：钻探了200 m长的新鲜黑色页岩-铁地层，并采集了实物样品。2)西澳大利亚皮尔巴拉海岸Cleaverville铁矿建造的横向变化。3)地球化学分析（同位素C、S）表明，3.2Ga时的海洋环境已准备进入岛弧附近的氧化生成体系。4)加纳2.2Ga的贝里姆期绿岩带保存了当时良好的大洋层序。在此基础上恢复了该地区的深海岛弧地层。

We did following four topics to understand Mesoarchean to Paleoproterozoic ocean floor environment. 1) 3.2Ga DXCL drilling project: 200m long fresh black shale-iron formation had been drilling and we collected flesh sample. 2) Lateral variation of Cleaverville iron formation in coastal Pilbara terrane, Western Australia. 3) Geochemical analysis (isotope C, S) shows ocean environment at 3.2 Ga already prepare to oxidation produce system at near the island arc condition. 4) 2.2Ga Berimian greenstone belt in Ghana have been preserved excellent oceanic sequence at that time. We reconstructed deep ocean island arc stratigraphy at this area.