太古宙—元古宙过渡分界及成矿动力体制转换

太古宙与元古宙之间分界时限较窄、测年数据偏新和混乱, 极大遏制了地球早期基础地质的深入研究.通过太古宙与元古宙分界标志和过渡标志的确定, 将太古代—元古代间动力体制转换类型划分为4种: 挤压体制向扩张体制转换; 垂直运动与水平运动间转换; 水平主压应力场转换; 地幔柱体制向板块构造体制转换.太古代与元古代间动力体制转换产物主要为真核生物、放射性元素、岩浆、矿产, 各自形成时限可达(3~5) × 108 a.太古宙与元古宙之间分界不应以单一年代划分, 而是一个渐变过渡的界线, 可初步确定在2.2 0~2.80Ga之间.太古宙—元古宙界线的划分应与地球动力学和构造体制等重大事件相联系, 此研究为探求早期深部成矿作用带来新的启迪 

Demarcating Interval between Archean Group and Proterozoic Group and Ore-Forming Dynamical Transformation

The narrowness and confusion of demarcating time between Archean and Proterozoic have kept deepening research on the early geology within great limits. Through determination demarcating and transiting criteria, the transformation of geo-dynamics system between Archean and Proterozoic can be divided into four types: transformation from compressional to extensional system, from vertical to horizontal, of principal stress, from mantle plume to plate tectonics. The relatively outcomes which formed within 0.3~0.5 billions year of transformations includes eucaryote, radioelements, magma and ores. The partition between Archean and Proterozoic should have a transiting line, that can be limited in 2.20~2.80 Ga. The partition has close relation with major geological events, and this work brings a new edification to ore-formation in depth.