大连西海岸低地沉积环境特征及其对气候环境指示意义
- 收稿日期:
2024-01-17
- 网络出版日期:
2024-05-14
摘要: 【目的】高分辨率气候重建对于探讨区域气候环境演变与高质量发展具有重要意义，该文旨在进一步研究辽东半岛多样的沉积环境并揭示出其古气候环境演化过程。【方法】通过对大连西海岸低地老渔窝（LYW）剖面进行AMS14C测年、岩性及地球化学元素分析，揭示其沉积环境和气候演变过程。【结果】该套沉积由粉砂、砂及碎石为主组成，记录了末次冰盛期末期到全新世中期（18815 cal. B.P.~6802 cal. B.P.）的沉积环境与气候演变信息。剖面中的主要化学成分是SiO2、Al2O3、K2O及Fe2O3（占比90.34%）；元素含量从大到小依次为SiO2＞Al2O3＞K2O＞Fe2O3＞Na2O＞CaO＞TiO2＞MgO＞P2O5＞MnO。研究区经历了干冷的冲积环境（18.8 cal. ka B.P. ~末次冰盛期末期）—稍暖湿的滨海潮间带环境（18.8~16.0 cal. ka B.P.）—暖湿的滨海潮下带环境（16.0~11.7 cal. ka B.P.）—最暖湿的滨海盐沼环境（11.7~6.8 cal. ka B.P.）和干冷的陆相流水环境（6.8~0 cal. ka B.P.）。本套沉积响应了新仙女木事件和8.0~9.0 cal. ka B.P.期间的短期快速气候事件并指示出6.8 cal.ka B.P.前后本区处于最高海平面。【结论】研究为辽东半岛末次冰盛期末期后的气候重建工作，尤其是大连西海岸沉积环境演变历史提供基础资料和信息。
Sedimentary environment and its Significance to Paleoclimate in the West Coast of Dalian Lowland
- Received Date:
2024-01-17
- Available Online:
2024-05-14
Abstract: Abstract: [Objective] The high-resolution climate reconstruction of Liaodong Peninsula is important for exploring the evolution of regional climate environment and high-quality development. The aim of this study is to reconstruct the sedimentary environment and climate history by studying the sediments of the west coast of Dalian. [Methods] By analyzing AMS14C dating, lithology, and geochemical elements of the Laoyuwo (LYW) section to reveal the evolution of sedimentary environment and paleoclimate of the region. [Results and Discussions] The sediment is mainly composed of sand, silt, and gravel, which recorded sedimentary environment and paleoclimate evolution information from the Last Glacial Maximum (LGM) to the Middle Holocene (18815–6802 cal.BP). The main chemical components in the profile are SiO2, Al2O3, K2O, and Fe2O3, the total content of which is 90.34%. The contents of major elements from large to small are SiO2 > Al2O3 > K2O > Fe2O3 > Na2O > CaO > TiO2 > MgO > P2O5 > MnO. The sedimentary records shows that the region experienced a dry and cold alluvial (18.8 cal.ka BP – late LGM), slightly warm and humid coastal intertidal (18.8–16.0 cal.ka BP), warm and humid coastal subtidal (18.8–16.0 aal.ka bp), warm and humid coastal subtidal（(16.0–11.7 cal.ka BP), warmest and wettest coastal salt marsh (11.7–6.8 cal.ka BP), and dry and cold fluvial environment (6.8–0 cal.ka BP). The highest sea level around 6.8 cal.ka BP and the rapid climatic events during Younger Dryas (DY) and 8.0–9.0 ka are also responses in the sediment. [Conclusions] This study provides basic data and information for the Holocene climate reconstruction of Liaodong Peninsula, particularly for the sedimentary environment evolution history of the west coast of Dalian.
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