湖泊纹层的沉积机理研究评述与展望

湖泊纹泥和湖相页岩主要沉积于湖水明显分层的条件下，湖水的分层受气候、盐度、水体深度等多方面的控制。在湖水分层的前提下，各种藻类、碳酸盐、有机质、粘土、粉砂等可以按不同季节分别形成不连续的纹层。其中，藻类、有机质纹层的沉积与藻类的季节性勃发密切相关；碳酸盐纹层的沉积可以与化学作用有关，也可以与藻类勃发产生的生物化学作用有关；粉砂、粘土则是以平流或层间流的方式季节性输入的。总之，纹层或页岩沉积的变化与气候的变化密切相关，利用纹层中的沉积信息研究气候和环境变化早已引起人们的重视，但以气候的周期性变化为主控因素来探讨纹层的变化和湖水的物理化学性质演化还有待开展。

A review and the prospects of the researches on sedimentary mechanism of lacustrine laminae

Lacustrine laminae are mainly deposited in lake water with obvious layering. Such factors as temperature, salinity and depth control the water layering. Some materials like algae, carbonate, organic matter, clay and silty sand can separately form different laminae in different seasons. The deposition of algae and organic matter is related to seasonal blooming of algae, and carbonate laminae may be related to chemical or biochemical deposition due to the blooming of algae. Clay and silty sand are transported by stratified current. In any cases, however, the variation in the deposition of laminae is closely related to the change of climates. Much importance has been attached to the application of laminae to deduce the changes of climates and environments in the past. Nevertheless, researches on the changes of laminae and the development of lacustrine physicochemical properties on the basis of periodic changes of climate remain to be conducted.