摘要
沉积节律主要受宇地系统场驱动。宇地系统场的年代性、滞后性及耦合关系等构成节律性的基本特征。节律是精细的年代计，可以依据事件时间谱系和场的性质，鉴别它的类型及级次，进行年代学研究。节律的阶段性和间断性起因于宇地场的沉积滞后效应。按滞后机制划分为ＳＬ型（海平面回升滞后）、ＭＦ型（最大海泛沉积滞后）和Ｔ型（构造突变滞后）。应用太阳黑子活动周期计算的宇地系统场的滞后率（１８％～２７％）可以作为推算ＳＬ型和ＭＦ型滞后时间量和周期的参数。微节律的拍节的耦合关系（１／２，１／４，１／５，１／８，１／１０比率）在碳酸盐台地中十分明显，Ａ—Ｅ五种耦合样式与复合海平面的各种变化趋势相关。风暴事件频率最大值与四级或三级海平面变化周期最大值相一致。宇地系统成因沉积动力学是新兴地学前沿分支学科，具有重要理论意义和应用前景，为储层微层序对比和高精度瞬时定量岩相古地理图编制开拓了新技术理论方法，也为沉积层控矿床成因聚集问题揭示了关键性契机。
The depositional rhythm is driven mainly by cosmos earth system field. The rhythm is a kind of accurate chronometer, its types and orders can be identified by the time lineage of events and the nature of cosmos earth field. The stage nature and discontinuity of rhythm may be attributed to the lag effect of the cosmos earth system field. Three types of lag effects, such as SL type, MF type and T type are divided by the lag mechanism. The lag ratio of cosmos earth system field (18%～27%) calculated through sunspot cycle is one of the parameters which can be used to calculate the time and period of the SL and MF type lag. The coupling relation of microrhythms, including the ratio of 1/2, 1/4, 1/5, 1/8 and 1/10, is very distinct on carbonate platforms. Five coupling patterns (A,B,C,D,E) are related to the corresponding composite sea level change. The maximun frequency of the storm events is consistent with the fourth or the third order maximum flooding stage. The depositional dynamics driven by the cosmos earth system field is a newly developed frontier branch and is of great theoretical and practical significance. It provides a new kind of theory and method to correlate the micro sequences and to work out the high resolution and quantitative lithofacies paleogeography maps. In addition, it reveals also an important ore genesis for the sedimentary and stratabound ore deposits.
出处
《地学前缘》
EI
CAS
CSCD
1997年第3期147-154,共8页
Earth Science Frontiers
关键词
宇地系统
沉积节律
沉积动力学
滞后效应
cosmos earth system, depositional rhythm, depositional dynamics, lag effect, coupling relation
