塔里木盆地震旦纪—奥陶纪岩相古地理

震旦纪至早古生代中期（寒武纪、奥陶纪），差异性构造升降活动，使塔里木盆地的古地理格局发生了重大演化。震旦纪，盆地性质具滨、浅海及局限海盆特征；寒武纪，盆地古地理特征的总趋势是西高东低，依次为碳酸盐台地～斜坡～深海盆地；奥陶纪，大规模海侵使中～西部的碳酸盐台地转化为混积陆棚，深海盆地也由寒武纪时期的欠补偿性演化为奥陶纪的补偿性盆地。到晚奥陶世晚期，早加里东运动的影响，海水几乎全部退出塔里木盆地，结束了盆地范围内震旦纪～奥陶纪沉积古地理发展演化史。

Sinian-Ordivician Dithfacies Paleogeography of Tarim Basin

Tarim basin is a composite basin with multiple cycles. As the first set of sedimentary cover on the basement, Sinian,Cambrian and Ordivician systems are characterized by great thickness and abundant sedimentary types. Lithofacies paleogeographic environment stretches from seastrand to deep sea. Basing on the outcrop section, drilling data and the analysis of carbon-oxygen isotope, trace element, geochemistry and palaeontology, the feature and distribution of lithofacies paleogeographic environment in Sinian, Cambrian and Ordivician periods are aanalyzed in this paper.