摘要
在详细的露头层序地层学研究基础上，本文将龙门山泥盆纪白云岩划分为层序界面上的、低水位和高水位的３种产状类型，各类白云岩岩石学、矿物学和碳氧同位素材征各不相同，分别具蒸发泵、埋藏、混合水和大气水淋滤－重结品改造白云岩石化模式，发育条件均受海平面升降变化控制、与沉积、成岩环境的演化密切相关。研究表明，各类白云岩的成因特征可作为识别层序界面和划分沉积体系域的重要标志之一。
On the basis of research on the outcrop sequence stratigraphy of Devonain in tongmen Mountains, the dolostones in the sequence stratigraphy may be divided into three occurrence types,which existed resistively in the sequence boundaries and lowerstand or highstand system tracts. The genetic characteristis of the three dolomite types were quite different,in Petrology,mineralogy and stable isotope(δ13C and δ18O). According tO these characteristics.it is considered that there were four modelw Of diagenesis,such as evaporative pumping dolomitization(modle I),buried diagenetic dolomitixation(model Ⅱ),dorag dolomitization(model Ⅲ), and meteoric vadose-buried recrystallized dolomitization (model Ⅳ). The developing conditions of the four dolomitization models were controlled by the sea-level changes and were closely related to the different depeitional system tracts. For example,the model Ⅰ and Ⅳ were developed in the typeⅠsequence boundaries,the model Ⅱ was occurred in the highstund system tracts and the model Ⅲ was existed in the lowerstand system tracts.All of the genetic characteristics of the dolostones may be marks to discern sequence boundaries and divid into different depositional system tracts.
出处
《矿物岩石》
CAS
CSCD
1996年第1期28-37,共10页
Mineralogy and Petrology
基金
国家基础性研究重大关键项目
关键词
白云岩
成因
层序地层学
泥盆纪
genetic type of dolostone
sequence stratigraphy
sequence boundary
depositional system tract
Devonain
Longmen Mounians
