【摘要】 <正> 一、前言滦河发源于巴延图古尔山,流经内蒙高原和燕山山地,在滦县出山区进入平原,至乐亭县汇入渤海。全长877公里,流域面积44900平方公里,年平均流量148米~3/秒,输砂量达2670万吨/年,是一条多沙性河流。滦河进入平原以后,大量泥沙堆积于河口地区,加之海水的作用,形成了滦河三角洲平原。由于滦河的多次改道,泥沙的堆积随着河口位置的迁移而变化。因而老的三角洲随着泥沙来源的中断而遭到不同程度的破坏,新的三角洲不断发育。在这种变化过程中,各种元素的迁更多还原

【Abstract】 The Luanhe River is a sandy river which accumulated enormous silt in the debouch region and formed a larger delta. The samples of surface deposits and drilling cores were collected in different parts of the delta. By analyzing the trace elements and examing the foraminifera and mussedshrimp, the indications of depositional environment of these samples are obtained. The contents of trace elements in various facies are completely different. The elements of Zn, Cu, Ni, Cr are trended to increase from terrestrial to marine facies deposition. The rate of Sr/Ba is lower than 0.3 in the terrestrial facies and it exceeds 0.4 in the marine facies. The rate of Mn/Fe increases in the same way. It is important that pho- sphate of ferric is in the terrestrial facies, but phosphate of lime is principaly in the marine facies. The calcium-phosphate fraction are appeared lower than 0.55 in the terrestrial facies, it is between 0.55--0.75 in the transitional facies, as for marine facies is more than 0.75. Two layers of marine facies are found in the stratum of over and above 50m in the delta of Luanhe River. From top to bottom, the first layer of marine facies is lie hidden in 1-20m where formed on marine transgression of middle Holocene. The second lie hidden in 21-40m or 40-60m where formed on during the end of late-Pleistocene.更多还原