北黄海西部泥质区全新世以来沉积有机碳埋藏特征  

The characteristics of sedimentary organic carbon in the mud area in the western North Yellow Sea since the Holocene

作　　者：王培杰 胡利民 闫天浩[1] 王厚杰 毕乃双[1,2] 王楠[2] 张洋[3] 吴晓[1,2] WANG Peijie;HU Limin;YAN Tianhao;WANG Houjie;BI Naishuang;WANG Nan;ZHANG Yang;WU Xiao(College of Marine Geosciences,Ocean University of China,Qingdao 266100,China;Key Laboratory of Submarine Geosciences and Prospecting Techniques,Ministry of Education,Ocean University of China,Qingdao 261000,China;Frontiers Science Center for Deep Ocean Multisphere and Earth System,Ocean University of China,Qingdao 261000,China)

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266100 [2]中国海洋大学海底科学与探测技术教育部重点实验室,青岛266100 [3]中国海洋大学深海圈层与地球系统前沿科学中心,青岛266100

出　　处：《海洋地质与第四纪地质》2024年第2期110-119,共10页Marine Geology & Quaternary Geology

基　　金：山东省泰山学者项目(TS20190913,TSQN202211054);国家自然科学基金项目“黄河口关键过程及物质输运协同效应重大科学考察实验研究”(42149301);山东省高等学校“青创团队计划”团队项目(2022KJ045);中央高校基本科研业务费专项“山东半岛泥质区千年尺度有机碳埋藏特征的区域差异与机制分析”(202161012),中央高校基本科研业务费专项“人新世河口海岸”(202241007)。

摘　　要：北黄海西部泥质区沉积环境稳定、沉积记录连续,是重建过去周边流域变化与黄海海洋环境信息的良好载体。目前围绕北黄海西部泥质区沉积有机碳的研究工作多局限于通过表层沉积物揭示其现代分布特征,对于该泥质区长时间尺度沉积有机碳埋藏过程与机制的研究相对薄弱。通过北黄海西部泥质区W03岩芯的总有机碳指标,重建了全新世以来北黄海西部沉积有机碳的埋藏特征,探讨了气候及海洋环境变化对北黄海西部沉积有机碳埋藏的控制机制。研究表明:海平面上升的停滞期(10.3~9.8 cal.kaBP),发育硬质黏土层,有机碳以陆源输入为主(60.7%),动荡的沉积环境导致总有机碳含量相对较低,平均含量仅为0.22%;海平面上升期(9.8~7.0 cal.kaBP),海源有机碳的贡献增加(47.7%),相对稳定的沉积环境有利于该时期有机碳的埋藏;高海平面以来(7.0 cal.kaBP至今),黄海环流体系逐渐形成,陆源有机碳输入随着东亚冬季风驱动的沿岸流强度变化发生相应的改变,海源有机碳的贡献继续增加(50.0%),总有机碳的含量升高至0.58%。北黄海西部泥质区全新世以来沉积有机碳埋藏主要受控于海平面变化和海洋环流体系的运动。The sedimentary environment of the mud area in the western North Yellow Sea is stable,and the sedimentary record is continuous,making it an excellent proxy for reconstructing paleoenvironment of the local region and surrounding watershed.Previous researches on the sedimentary organic carbon in the mud area are limited to its modern distribution characteristics through surface sediment analysis,and works on the long-term sedimentary processes and mechanisms of organic carbon remain insufficient.Core W03 in the mud area was used to reconstruct the sedimentary environment of organic carbon since the Holocene using sedimentary total organic carbon index,and to clarify the impact of climate and oceanic environmental changes on the source and deposition of organic carbon.During the period of sea level rise stagnation(10.3~9.8 cal.kaBP),a hard clay layer was developed rich in terrestrial organic carbon(60.7%).The turbulent sedimentary environment resulted in a relatively low total organic carbon content(average of only 0.22%).During the period of sea level rising(9.8~7.0 cal.kaBP),marine-sourced organic carbon(47.7%)boomed in a relatively stable sedimentary environment,which was conducive to the burial of organic carbon.Since the high sea level period(7.0 cal.kaBP to present),the Yellow Sea circulation system has been formed gradually,and the input of terrigenous organic carbon has changed correspondingly with the change of coastal current intensity under the East Asian winter monsoon scheme.The contribution of marine organic carbon was increased continuously to 50.0%,and so did the content of total organic carbon(0.58%).Therefore,sedimentary organic carbon in the mud area since the Holocene is controlled by sea level fluctuation and the resultant ocean circulation system.

关 键 词：泥质区 全新世 沉积有机碳 北黄海 

分 类 号：P736.2[天文地球—海洋地质]