摘要
综述了弧前盆地的沉降机制、充填序列及主要识别标志。沉降机制分析表明，其沉降速率总体呈下降趋势。沉积充填序列总体表现为一向上变粗、变浅的巨层序，其具体发育规律主要受增生槛高程、充填速率与沉降速率比值控制。特殊的构造部位，弱的变形、变质和富有特色的沉积序列，砂岩碎屑组分是判别化石弧前盆地的主要标志。
The subsidence mechanism,infilling sequence and main recognition criteria of forearc basin are reviewed.Analysis of subsidence mechanism suggests that subsiding rate decreases with basin evolution.Accordingly,their infilling sequences are characterized by an upward shoaling megasequence with turbidites overlain by shelf or non marine strata.And their concrete sedimentary features are mainly controlled by accretionary sill elevation and the ratio of infilling rate to subsidence rate.The criteria recognizing fossil forearc basin are presented and discussed in geotectonic position,deformation and metamorphism,sedimentary sequence and model compositions of volcano plutonic sandstone suits.
出处
《地质科技情报》
EI
CAS
CSCD
北大核心
1998年第4期1-7,共7页
Geological Science and Technology Information
基金
国家自然科学基金
国家305项目
关键词
弧前盆地
沉降机制
充填序列
识别标志
盆地
forearc basin,subsidence mechanism,infilling sequence,recognition criteria
