摘要
浙江象山“石浦灰岩”一直是地质界长期争论的问题。本文根据古生物化石、地层、岩性对比及地层层理构造、侵入体的同位素绝对年龄、微量元素、沉积磷酸盐法、岩石组构、硅质岩的成因、及火山碎屑岩中Na_2O,K_2O,FeO,Fe_20_3,MgO与陆相火山岩的差别,提出其时代应属于晚侏罗—早白垩世,偏向早白垩世,其11—39层地层为海陆过渡相沉积。并推测东海海域可能存在一个海相或过渡相的早白垩世地层。
The age and sedimentary facies of the 'Shipu limestone' in, Zhejiang has be- en long disputed. The authors have studied the fossils, stratigraphy, lithology, stratification, isotopic ages of the intrusion, trace elements, sedimentary phosphates, rock fabrics, origin of siliceous rocks and differences between pyroclastic rocks and continental volcanic rocks in respect to Na_2O, K_2O, FeO, Fe_2O_3 and MgO. On the basis of an integrated analysis of these data combined with the data of neighbouring areas, the authors propose that the 'Shipu limestone' should be Late Jurassic-Early Cretaceous in age, more possibly Early Cretaceous. Beds 11—39 of it are marked by paralic sediments. It is inferred that there might exist Early Cretaceous marine or paralic strata in the East China Sea area.
出处
《地质论评》
CAS
CSCD
北大核心
1989年第3期221-229,共9页
Geological Review
