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热带西太平洋碳酸盐溶跃深度及其变化规律
投稿时间:2019-10-22  修订日期:2019-11-29  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020048
摘要点击次数: 115
全文下载次数: 97
作者单位E-mail
齐泽坤 海底科学与探测技术教育部重点实验室 青岛 2109321512@qq.com 
徐继尚 中国海洋大学海洋地球科学学院 青岛
海底科学与探测技术教育部重点实验室 青岛 
jishangxu@ouc.edu.cn 
李广雪 青岛海洋科学与技术国家试点实验室 青岛
海底科学与探测技术教育部重点实验室 青岛 
 
赵蒙维 青岛海洋科学与技术国家试点实验室 青岛
青岛海洋科学与技术国家试点实验室 青岛 
 
孙思婷 海底科学与探测技术教育部重点实验室 青岛  
周尚 中国海洋大学海洋地球科学学院 青岛
海底科学与探测技术教育部重点实验室 青岛 
 
熊梦君 中国海洋大学海洋地球科学学院 青岛
中国海洋大学海洋地球科学学院 青岛 
 
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:碳酸盐的溶解与保存是全球碳循环的重要组成部分,研究碳酸盐溶解作用对探索碳循环机制、理解全球气候变化机理等具有重要意义。本文通过西太平洋暖池核心区雅浦海沟南部附近海域108个表层沉积物和4个柱状沉积物样品中浮游有孔虫、底栖有孔虫和碳酸钙含量等变化特征分析了海底碳酸盐溶跃深度、补偿深度及其自中更新世以来的变化规律。表层沉积物碳酸钙含量、浮游与底栖有孔虫丰度、底栖有孔虫占有孔虫全群比例、底栖有孔虫群中胶结质壳比例等多种指标变化研究表明,本区现代碳酸盐溶跃面( carbonate lysocline depth, CLD)位于水深3800米附近,碳酸盐补偿深度(carbonate compensation depth, CCD)约为4800米。柱状样有孔虫溶解指数(foraminifera dissolution index, FDX)的变化表明,冰期碳酸盐溶解作用减弱,碳酸盐溶跃面和补偿深度变深;冰消期碳酸盐溶解作用增强,溶跃面和补偿深度变浅。位于现代溶跃面附近的柱状岩心碳酸盐含量呈现冰期高、间冰期低的“太平洋型”旋回特征,同时古生产力替代性指标的变化曲线与碳酸盐含量没有明显的相关性,说明中更新世以来的碳酸盐含量变化主要受溶解作用的控制,特别是在冰期-间冰期转换时期更为明显。
中文关键词:西太平洋暖池  有孔虫分布  碳酸盐补偿深度  溶跃面变迁  碳酸盐溶解旋回
 
The variation of carbonate lysocline depth in the western tropical Pacific Ocean
Author NameAffiliationE-mail
qizekun Ocean University of China 2109321512@qq.com 
xujishang 1)Key Laboratory of undersea science and exploration technology, Ministry of education, Qingdao 266100
2) School of marine Geosciences, China Ocean University, Qingdao 266100
3) Qingdao national pilot Laboratory of marine science and technology, Qingdao 266100) 
jishangxu@ouc.edu.cn 
liguangxue 1)Key Laboratory of undersea science and exploration technology, Ministry of education, Qingdao 266100
2) School of marine Geosciences, China Ocean University, Qingdao 266100
3) Qingdao national pilot Laboratory of marine science and technology, Qingdao 266100) 
 
zhaomengwei Qingdao national pilot Laboratory of marine science and technology, Qingdao  
sunsiting Key Laboratory of undersea science and exploration technology, Ministry of education, Qingdao 266100
2) School of marine Geosciences, China Ocean University, Qingdao 
 
zhoushang Key Laboratory of undersea science and exploration technology, Ministry of education, Qingdao 266100
2) School of marine Geosciences, China Ocean University, Qingdao 266100 
 
xiongmengjun School of marine Geosciences, China Ocean University  
Abstract:Dissolution and preservation of carbonate is an important part of global carbon cycle. So the study of carbonate dissolution is of great significance in exploring the mechanism of carbon cycle and understanding the mechanism of global climate change. In this paper, we analyze the carbonate lysocline depth (CLD), compensation depth (CCD) and their variation since the Middle Pleistocene by the characteristics of planktonic foraminifera, benthic foraminifera and calcium carbonate in 108 surface sediments and 4 columnar sediment samples collected from the southern part of the Yapu Trench. According to the surface sediment calcium carbonate content, abundance of planktonic and benthic foraminifera, proportion of benthic in the whole foraminifera, benthic’s cemented crust proportion and other indicators, the modern CLD in this area is located near the water depth of 3800 meters, and the CCD is about 4800 meters. The change of columnar foraminifera dissolution index indicates that the dissolution of carbonate is weakened in the glacial period with the CLD and CCD deepened; while the dissolution of carbonate is enhanced, the CLD and CCD shallowed in the deglacial phase. The carbonate content of columnar cores near the modern lysocline shows the "Pacific type" cycle characteristics, which with high carbonate content in glacial period and low in interglacial period. At the same time, there is no obvious correlation between the variation curve of paleo-productivity index and carbonate content. Therefore, it is considered that the carbonate content change in the study area is mainly controlled by dissolution, especially during the glacial-interglacial transition period since Pleistocene.
keywords:Western Pacific warm pool  foraminifera distribution  carbonate compensation depth  change of lysoclinic  carbonate dissolution cycle
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