【摘要】 <正> 本工作区位于钦州市东南沿海,东起大风江口,西至钦州湾东北海岸。东、西部为滨海平原,中部剥蚀侵蚀台地濒临海岸,北面为起伏较大的丘陵。调查区内有海滨钛铁矿富集地带。为了解本区钛铁矿的储量,查清重矿物富集与地层之间的关系,我们分别在几道沙堤——泻湖布设了8个砂钻和13个钻孔(图1),用此来揭示全新世地层,并对岩心进行了微体古生物、重矿物、粒度等分析。本文主要根据这些钻探资料编写而成。更多还原

【Abstract】 Based on analysis of more than 20 bbring cores in Xiniujiao area some knowledge about Holocene strata and the developing history of this area is obtained. In pre-Holocene, the study area was a erosion-denudation plain covered with weathered deposits from grarite, sand stone and mud stone of the Jurassic and Silurian systems, as well as by the freshwater deposits consisting of the black and grey mud.During the middle Holocene transgression, this area was overlain by lower littoral facies composed of muddy deposits in lagoons and sand on bars. The strand plain was inundated, and then the fine sediments with marine microfossils were deposited in lagoons and even on bars when the maximal transgression occurred. In late Holocene the strandplain prograded, especially in the area of Dafun Estuary, and then upper littoral facies, composed of coarse sediments on bars and sandy clay in marsh, are formed.更多还原