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本文在文献[1]的基础上,记述了后石井这套石英-生物砂屑灰岩的物质成分、沉积结构和成岩作用特征,并与当地的现代海滩砂、海岸沙丘砂作了对比,进一步讨论了它们的成因与物质来源问题。作者认为,它们是大气降水胶结海岸沙丘砂所形成的海岸沙丘岩,是中全新世末东北季风吹扬附近海滩砂再堆积的结果。  相似文献   
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福建莆田海岸沙丘岩——Ⅰ.沉积构造与古风   总被引:8,自引:0,他引:8  
福建莆田后石井海岸沙丘岩由三个沙脊组成。本文记述了这些沙脊的形状与沉积构造,并在讨论其成因的基础上重建了古沙丘类型与古风向。本文认为,它们是中全新世末盛行的东北季风吹扬海滩沉积物再堆积所形成的有植被沙丘与风影沙丘,古今风向未发生明显的变化。  相似文献   
3.
Carbonate eolianites in Houshijing, Putian, Fujian, consist of three sand ridges. The geometry and sedimentary structures of these ridges are described here, and their paleodune types and the paleowind directions are reconstructed on the basis of discussion of genesis. The authors consider that they were vegetated longitudinal dunes or sand drifts and wind shadow dunes or sand shadows which were formed by reworking of adjacent beach sand by prevailing northeast monsoon during the latest Middle Holocene. The wind directions in the past and at present do not appear to have obviously changed.  相似文献   
4.
江苏建湖庆丰剖面的沉积地层、软体动物、有孔虫、介形类、孢粉与藻类分析鉴定及~(14)C年代测定结果,表明剖面上部近5m为全新世地层。本文论论了该地全新世植被演替、气候变化与环境变迁过程,区分出6个阶段。海面曾发生3次明显的升降变化及数次规模较小的波动,其中中全新世大西洋期为高于现今海面的高海面时期。  相似文献   
5.
江苏阜宁西园全新世风暴沉积与海岸沙丘的发现及其意义   总被引:6,自引:0,他引:6  
江苏阜宁西园地区的“西冈”堤状砂质堆积体,往往被认为是典型的“贝壳砂堤”,实际上,它是由成因不同的两大部分所组成:下部为障壁沙坝主体,其主要部分为风暴沉积,形成于6700—5500 aBP间;上部为海岸沙丘,由风成沙、古土壤序列及丘间泥炭堆积组成,发育于5500 aBP以来,以阜宁西园剖面为代表的障壁沙坝和以建湖庆丰剖面为代表的坝后潟湖,构成了苏北中部平原的沙坝-潟湖体系,沙坝与潟湖的发育具有明显的关联性与一致性,与中全新世以来的海面变化有密切的关系。  相似文献   
6.
On the basis of Ref. [1] entitled "Carbonate eolianites in Putian, Fujian (Ⅰ)——Sedimentary structures and paleowinds", the sediment composition, sedimentary textures and diagenesis of the quartz-calcarenites in Houshijing, Putian, Fujian are described here and compared with those of adjacent modern dune and beach sands, and their genesis and sources of sediment are discussed further. The authors consider that they are carbonate eolianites which were formed by coastal dune sand derived from reworking of adjacent beach sand by prevailing northeast monsoon winds and then cemented by freshwater subaerially during the end of the Middle Holocene.  相似文献   
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