摘要
甘溪剖面泥盆纪海相碳酸盐岩的同位素地层曲线卢武长，崔秉荃，杨绍全，张平（成都地质学院）海相碳酸盐的同位素演化很早就引起人们注意Ｚ１９３６年Ｎｉｅｒ和Ｇｕｌｂｒｓｎｓｅｎ首次研究海相石灰岩的碳同位素组成。１９５１年Ｕｒｅｖ测定了箭石的氧同位素。Ｅ。ａｒ...
Abstract Ganqi profile with a length of 13 km is located by a road from Mianyang to Pinwu. Started at Guixi grain depot and ended at limekiln of Shswozi. The Devonian of Longmenshan belongs to shallow sea and shallow water deposits. The elastic rocks of lower part of low-Devonian overlay unconformly on the lightly metamorphic siltstone and silty slate of lower-middle Silurian. Middle pert of low-Devonian to lower pert of mid- Devonian are charcteraized by interbedded elastic and carbonate rocks. Upper part of mid- Devonian and up-Devonian are entirely carbonate deceits.The marine carbonates of Devonian from Ganxi profile are determined serially for Sr.C. O isotopes and Na. Sr. Mn、Al、Fe、Mn trace elements as well as cathodolumines feature. Sr and C isotope stratigraphic curves of marine carbonates of Devonian are first set up some conclusions are as follows.1. Based on studies of trace element and C.O isotopes most samples of marine carbonate and brachiopoda fossil have the same strorium and carbon isotopic features as they deposited.2. Sr and C isotope stratigraphic curves of Devonian marine carbonates and fossils from Ganxiprofile are familiar with the function curves of geological age (B. N. Popp et al 1986 ;W. H. Barke,1982; L. R. Kump and Garrels. 1986). They implicates that Sr and C isotopic compeitions of marine carbonates and fossil are controlled by globe factors (but C isotopic compeition is superimposed influence of regional geological process) and have significance on statigtaphic correlation.3. C and O isotopic components of marine carbonates vary obviously at geological boundaries and can be used as subsidiary criteria for stratigfaphic division.4. When deposited, marine carbonates formed by organism or non-organism have no detectuble fractionation of strontium isotope.
出处
《沉积学报》
CAS
CSCD
北大核心
1994年第3期12-20,共9页
Acta Sedimentologica Sinica
基金
国家自然科学基金
