论文部分内容阅读
运用微化石及沉积学方法，对采自罗卡尔海槽北部不同沉积环境下的六个浅层重力管样品进行了层序分析，从采自巴拉扇沉积的钻孔样品可识别出半远洋、浊流、准浊流沉积层序。从罗卡尔海槽东北部的陆坡裙、海底陆坡到冰碛沉积区内获得的岩芯，是一些半远洋与冰海沉积物、泥质粉砂岩和等深积砂岩与之互层或覆于其上，甲藻类孢子，浮游有孔虫类以及超微生物地层标志，反映了四次冰消作用，巴拉扇的一个长岩芯样记录了这四次冰消作用，即晚冰期、阿勒罗德—波令期、新仙女木期及全新世，沉积记录显示了北大西洋的冰消作用不是一个简单的线型演变过程，而具有非线型的突变事件特征。由于海面温度的突变，而影响了海底洋流的活动。
Using the methods of microfossils and sedimentology, the sequence analysis of six shallow gravity pipe samples taken from different depositional environments in the northern part of the Rochakai Channel shows that the semi-ocean , Turbidity flow, quasi-turbidity flow sedimentary sequence. The cores obtained from the continental skirts, seabed slopes to the moraine sedimentary region in the northeastern part of the Rochak Channel are those in which the semi-oceanic and glacial sea sediments, argillaceous siltstones, and equiamentary sandstones interbedded with or overlying On it, dinoflagellate spores, planktonic foraminifera and super-microbial stratigraphic signs, reflecting the four ice disappear effect, a long core of the Bala fan-like record of the four ice disappear, that is, the late glacial period, Ale The sediments of the Roland-Beringian, Neo-Sinian, and Holocene sediments show that the ice accretion in the North Atlantic is not a simple linear evolution but a nonlinear event. Due to the abrupt change of sea surface temperature, the activity of ocean currents is affected.