Ey1 has the unique desultory-weak or gap seismic reflection structure as its one of the most important characteristics.It is very important to clarify sedimentary characteristics and its origin for Yitong Graben and i...Ey1 has the unique desultory-weak or gap seismic reflection structure as its one of the most important characteristics.It is very important to clarify sedimentary characteristics and its origin for Yitong Graben and its sedimentary facies and tectonic evolution.On the basis of the research of core analyses,well logging data analyses,sedimentary facies analyses and seismic reflection structure analyses,the authors have concluded the sedimentary characteristics of Ey1,and have carried out Ey1 sedimentary environments and its origin.The result shows that Ey1 desultory-weak or gap seismic reflection may be a series of small scale secondary sediment fans superimposition.展开更多
通过对浙江萧山白马湖地区BMH全新世钻孔沉积物中硅藻及其主成分进行分析,揭示研究区9 600—7 230cal a BP期间与海平面相关的沉积环境变化。结果显示9 600—8 950cal a BP期间,硅藻组合以淡水种为优势种,未出现海水种,反映研究区为淡...通过对浙江萧山白马湖地区BMH全新世钻孔沉积物中硅藻及其主成分进行分析,揭示研究区9 600—7 230cal a BP期间与海平面相关的沉积环境变化。结果显示9 600—8 950cal a BP期间,硅藻组合以淡水种为优势种,未出现海水种,反映研究区为淡水沼泽环境,没有受到海水的影响;8 950—8 600cal a BP期间,硅藻组合中半咸水种出现且含量逐渐增加,但仍以淡水种为主要优势种,表明研究区受到间歇性潮汐或风暴潮的影响,对应于高潮滩-潮上带的沉积环境;半咸水种和海水种含量在8 600—8 300cal a BP期间显著增加,而淡水种的含量明显降低,说明当时海平面显著上升,白马湖地区处于潮下带;在8 300—7 230cal a BP段的沉积物中未发现硅藻壳体,可能与当时研究区干涸成陆或埋藏条件有关,对应于跨湖桥文化时期(8 000—7 000cal a BP)。白马湖地区硅藻记录的8 600—8 300cal a BP海平面上升事件,在同时期的长江三角洲、东南亚乃至全球其他很多地方均有记录,可能与该时期劳伦太德冰盖融水事件(Laurentide Ice Sheet)以及Agassiz-Ojibway湖溢水事件所导致的全球海平面快速上升有关。展开更多
文摘Ey1 has the unique desultory-weak or gap seismic reflection structure as its one of the most important characteristics.It is very important to clarify sedimentary characteristics and its origin for Yitong Graben and its sedimentary facies and tectonic evolution.On the basis of the research of core analyses,well logging data analyses,sedimentary facies analyses and seismic reflection structure analyses,the authors have concluded the sedimentary characteristics of Ey1,and have carried out Ey1 sedimentary environments and its origin.The result shows that Ey1 desultory-weak or gap seismic reflection may be a series of small scale secondary sediment fans superimposition.
文摘通过对浙江萧山白马湖地区BMH全新世钻孔沉积物中硅藻及其主成分进行分析,揭示研究区9 600—7 230cal a BP期间与海平面相关的沉积环境变化。结果显示9 600—8 950cal a BP期间,硅藻组合以淡水种为优势种,未出现海水种,反映研究区为淡水沼泽环境,没有受到海水的影响;8 950—8 600cal a BP期间,硅藻组合中半咸水种出现且含量逐渐增加,但仍以淡水种为主要优势种,表明研究区受到间歇性潮汐或风暴潮的影响,对应于高潮滩-潮上带的沉积环境;半咸水种和海水种含量在8 600—8 300cal a BP期间显著增加,而淡水种的含量明显降低,说明当时海平面显著上升,白马湖地区处于潮下带;在8 300—7 230cal a BP段的沉积物中未发现硅藻壳体,可能与当时研究区干涸成陆或埋藏条件有关,对应于跨湖桥文化时期(8 000—7 000cal a BP)。白马湖地区硅藻记录的8 600—8 300cal a BP海平面上升事件,在同时期的长江三角洲、东南亚乃至全球其他很多地方均有记录,可能与该时期劳伦太德冰盖融水事件(Laurentide Ice Sheet)以及Agassiz-Ojibway湖溢水事件所导致的全球海平面快速上升有关。
