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通过对辽东半岛西部的长兴岛八岔沟古泻湖平原进行钻孔调查取样,对由海向陆4个不同地点的100余个钻孔样品,进行粘土混浊水导电率测定,区分了八岔沟古泻湖平原的海陆相沉积层,查明了该古泻湖平原的海相层上限的高度。结果表明:该平原各孔的海相层上限高度具有明显的一致性,大约为海拔4.0~4.2 m,此高度代表了该古泻湖平原全新世最高海平面期间海水所达到的平均高潮线的高度。通过测定和讨论覆盖在海相层上的泥炭底部14C年代,明确了该区略早于5800 cal.aB.P.达到全新世最高海平面。全新世最高海面期的平均海平面高度约为海拔3.4~3.6 m。将此高度与辽东半岛东部大孤山一带的全新世高海平面期(6000~5500 cal.aB.P.)的平均海平面的高度值约2 m相对比,显示出在全新世期间辽东半岛西部八岔沟一带较东部的大洋河平原有相对上升的趋势。深达9 m的B3孔的导电率有两个高峰值,反映该平原全新世曾发生过两次海侵,较晚一次海侵的最大范围达到距现代海岸线约1.2 km处。
Based on the sampling survey of the ancient lagoon plain in Badalou, Changxing Island, western Liaodong Peninsula, the muddy water conductivity of clay was measured for more than 100 drilling samples from four locations in the sea to the sea. The sea-land facies of the ancient lagoon plain identified the height of the marine upper limit of the ancient lagoon plain. The results show that there is a clear agreement between the maximum height of the marine layers in each hole in the plain, which is about 4.0-4.2 m above sea level, which represents the height of the average climax line reached by seawater during the Holocene sea level in the ancient lagoon plain . By measuring and discussing the 14C dating of peat bottoms over the marine facies, it was clear that the area reached the highest Holocene sea level slightly earlier than 5800 cal.aB.P. The average sea level at the highest sea level of the Holocene is about 3.4 ~ 3.6 m above sea level. Compared with the average sea level height of about 2 m in the Holocene high sea level (6000 ~ 5500 cal.aB.P.) in the vicinity of Dadushan in the eastern part of Liaodong Peninsula, this height shows that during the Holocene, the Liaodong Peninsula There is a relative upward trend in the western part of the 8 Chagou compared with the Dayanghe Plain in the east. The conductivity of B3 holes up to 9 m in height has two peaks, reflecting that two transgressions occurred in the Holocene over the plains. The later transgression reached a maximum range of about 1.2 km from the modern coastline.