地质学报2011，Vol.85Issue(8)：1352-1367,16.DOI:11-1951/P.20110804.1239.004
渤海湾沿岸晚第四纪地层划分及地质意义
Stratigraphic Division of the Late Quaternary Strata along the Coast of Bohai Bay and Its Geology Significance
摘要
Abstract
This paper, taking four drilling holes cutting through the upper Pleistocene as an example to classify the late quaternary strata along the coast of Bohai Bay, discussed lithofacies paleogeography and neotectonic characteristics, based on lithology and sedimentary structures, 14C ages of peat and humus mud, micropaleontology and palynology, and the theory of climatic stratigraphy and sequence stratigraphy. Nine units divided are MIS5e (Marine Isotope Stage 5e), MIS5d, MIS5c, MIS5b, MIS5a, MIS4, MIS3, MIS2 and MIS1 in an ascending order. Transgressions occurred in MIS5e, MIS5c, MIS3 and MIS1. Marsh, interfluve and lagoon formed during the MIS5e due to river action equivalent to sea action. Interfluve and river and sand bank-lagoon formed during MIS5c because of river action better than sea action. 7~8 m thick of marine sediment formed when sea level rose at the early stage of MIS3, and then river and sand bank and lagoon formed when sea level fell at the late stage of MIS3 because of river action strengthening. 10 -15 m thick of marine sediment thickness formed in the northern and western coasts; 3 m thick of lagoon sediment formed in the southern coast. The ancient Yellow River deltas had prograded from south to north in the coast of Bohai bay. The hard clay and interfluves formed when sea level fell during MIS5d, MIS5b and MIS2. Marsh formed during the last deglaciation because of sea level rising. The coast of Bohai Bay was characterized by differential subsidence during the Late Quaternary. The differential subsidence rate between southern Huanghua depression and Chengning uplift reached 0. 16 mm/a, while the rate of the northern and middle sections of the Huanghua depression reached 0. 31 mm/a. MIS5c was the period of the tectonic activity.关键词
晚第四纪地层/渤海湾/岩相古地理/差异沉降Key words
the Late Quaternary strata/ Bohai Bay/ lithofacies paleogeography/ differential subsidence引用本文复制引用
胥勤勉,袁桂邦,张金起,秦雅飞..渤海湾沿岸晚第四纪地层划分及地质意义[J].地质学报,2011,85(8):1352-1367,16.基金项目
本文为国土资源大调查项目(编号1212010610408,1212010914023,1212010814005)资助成果. （编号1212010610408,1212010914023,1212010814005）
