黄海晚更新统表层与全新统底层的沉积相及其界面特征

CHARACTERISTICS OF STRATIGRAPHIC BOUNDARY BETWEEN LATE PLEISTOCENE AND EARLY HOLOCENE SERIESES AND THEIR SEDIMENTARY FACIES IN THE YELLOW SEA

掌握界面特征对划分晚更新统与全新统地层有着十分重要的作用.界面埋深的变化是水动力及泥沙运动等沉积环境要素的反映.黄海晚更新统与全新统地层有两种接触关系:整合接触与不整合接触,在黄海深水区以整合接触居多.黄海晚更新统与全新统地层界面存在若干分区,这些界面分区的特征,全面反映黄海从晚更新世末期过渡到全新世初期时,古地理环境变化的多种信息和各种不同特点.

In recent years, extensive and thorough studies have been made on late Pleistocene and Holocene strata of the Yellow Sea. Through a comprehensive analysis and studies of nearly a thousand surface samples and a hundred core samples obtained from the Yellow Sea, not only an all-sided understanding of the characteristics of sedimentary facies of late Pleistocene and early Holocene serieses in the Yellow Sea but also a further understanding of the characteristics oi sedimentary interfaces between them have been acquired. It is very important to have a good grasp of the interfacial characteristics in the division of late Pleistocene and Holocene strata. The variations in buried depth of the interfaces reflect sedimentary environmental elements such as hydrodynamics and movement of sand and mud. There are two kinds of contacts between late Pleistocene and Holocene strata, namely, the conformable contact and the unconformable contact. The conformable contact exists mostly in the deep waters of the Yellow Sea. Several subdivisions exist in the inter- faces between late Pleistocene and Holocene strata. The characteristics of these subdiyisions of ths interfaces reflect all-sidedly various kinds of informations and different features about the changes of paleogeographic environments in the transition period from late late Pleistocene to early Holocene.