渤海西岸全新世气候演化与海陆变迁

应用第四纪地质学和海相生物等化石数量统计,以天津马棚口海岸带BQ1孔化石鉴定与统计结果,对古气候、古事件进行对比研究。通过岩芯编录,在岩性层中划分出4个海相层、5个过渡层、9个海面波动。结合研究区广泛分布的贝壳堤和牡蛎礁,利用其大量的测年资料,重现了6道海岸线;根据海相化石个体统计数,画出全新世气候演化曲线,与孢粉和物候所画的古气候演化曲线大体一致。研究历代海陆变迁,必然涉及到历史上长期争论不休的西汉大海侵等问题,谭其骧（1965）圈定的大海侵范围、海岸线分布以及考古结果几乎都能联系在一起,因此,大海侵之谜终于尘埃落定。考古界对河北平原自东汉—金的空白也有了初步答案,同时,发现中国朝代兴衰与气候冷暖有明显的对应,从而建立了气候分期。

Holocene climate evolution and land-sea changes on west Bohai Sea

According to Quaternary geology and statistics of marine fossils number,the contrastive study of paleoclimate and palaeogeographic event was completed by using fossils identification and statistical results of hole BQ1 in Mapengkou littoral belt. Through core logging,the litho-horizon was classified into four marine layers,five transition beds and nine sea surface waves. The six coastlines were distinguished on the basis of shell bank and oyster reef widely distributed in the study region and a number of dating data. The statistics of marine fossils indicated that Holocene climate evolution curve was in substantial agreement with paleoclimate evolution curve drawn by pollen and phenology. It was necessarily to involve debated problems,that was Western Han Dynasty Transgression during research of historic land-sea changes. The scope and coastline distribution of transgression were almost connected with archaeological results on the basis of Mr. Tan Qixiang in 1965. Therefore,the mystery of the sea transgression was finally settled. The understanding gap in archaeology from Eastern Han Dynasty to Jin Dynasty on Hebei Plain also had a preliminary answer. At the same time,the division of climate was established,because rise and decline of Chinese dynasties were clearly relevant with the changes of the climate.