【作者】 余华；

【导师】 李巍然； 刘振夏；

【作者基本信息】 中国海洋大学 ， 海洋地质， 2003， 硕士

【摘要】 DGKS9617孔(31°18.58′N，124°26.437′E)位于东海内陆架北部扬子浅滩边缘，水深57m，柱长851cm，是目前该区所取得的较长的一个重力柱状样。对该岩芯进行了粒度、沉积构造、重矿物和常微量化学元素等分析，并综合以上各种指标对岩芯的物质来源和沉积环境进行了详细的探讨。 柱样记录了全新世中晚期以来的气候和环境演变过程，其沉积物主要来源于长江，从岩芯底部到顶部其沉积环境由浅海潮流环境逐渐演变为浅海环境。全新世大暖期，亚北方期、全新世中期的变冷事件等气候波动在柱样中都有明显的记录。 研究还发现重矿物、碳酸盐、某些微量元素以及过渡金属元素，如铁族元素Fe、Mn、V、Cr、Ni和亲铜元素Cu、Zn等在判别沉积物长江、黄河源属性方面比较有效；某些矿物和地球化学指标在反映气候或沉积环境上比较灵敏，如长石／石英、Na元素的含量变化等与气候变化比较一致，而Sr/Ba比值的变化则与海面的相对变化相一致。更多还原

【Abstract】 Piston core DGKS9617 (31° 18.58’ N, 124° 26.437’ E, water depth 57m, core length 851cm) locates on the edge of Yangtze Shoal, inner shelf of the East China Sea. It is a long piston core of this area. By comprehensively analyzing grain size, sedimentary structure, heavy mineral, major and trace element of this core, we discuss material sources and sedimentary environment of it.Core DGKS9617 records the paleo-climate and paleo-environment evolution of Mid-and Late-Holocene. Yangtze River provides most of the sediment. Its sedimentary environment changes from tidal shallow marine to shallow sea. Some Holocene climate fluctuations, such as Holocene Megathermal, subboreal phase and Mid-Holocene cold event are recorded obviously in this core.We also find that heavy minerals, carbonate, some trace elements and transitive metals, such as Fe, Mn, V, Cr, Ni, Cu, Zn are effective in discriminating the origin of the sediment, from Yangtze River or Yellow River? Some mineral and geochemical indexes are sensitive to the variation of the paleo-climate and paleo-environment. For example, the ratio of feldspar/quartz and the vertical content of natrium vary with the fluctuations of climate, and the change of Sr/Ba responds to the sea-level vibration.更多还原