摘要
在海南排浦发现了海相第四纪与海相上新世地层界限剖面.上新世地层富含与台湾苗栗群相当的腹足类、瓣鳃类化石组合.早更新世地层为潮间坪沉积,富含潜穴,潮汐层理发育.两者之间为厚0.5—1cm的氧化铁层是间断面的标志.其上下均见白云石化作用层,应是西沙事件旋回的产物.
Through study, the Hainan Paipu section is determined to be stratigraphic boundary between Quaternary and Pliocene marine sediments. Pliocene strata are in littoral facies, with abundant marine mollusca and bivalvia. Early Pleis-tocene strata are in intertidal flat facies, also with marine bivalvia, which are similar to Miaoli group of Taiwan. The tidal bedding and bioturbation str-uctures are characterized by sand/mud rhythmic bedding and resting traces. The bottom boundary of early Pleistocene was marked by an iron oxidized pan from 0.5 to 1cm thick and the contact with Pliocene is clear. It is a discor-dant surface.
Dolomitization of the discordant surface above and below is quite different. Above the discordant surface, dolomitization is formed by fresh ground water and sea water model, and below the discordant surface, formed by evaporation model. Age of dolomitization is Pliocene and early Pleistocene, belonging to the Xisha event cycle.
出处
《海洋地质与第四纪地质》
CAS
CSCD
北大核心
1990年第1期47-59,共13页
Marine Geology & Quaternary Geology
基金
国家自然科学基金资助项目
