| 维嘉海山沉积过程及其对西太平洋海山演化的意义 |
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| 引用本文： | 赵斌,吕文超,何高文,张宝金,韦振权,宁子杰,张旭东.维嘉海山沉积过程及其对西太平洋海山演化的意义[J].地球科学,2022,47(1):357-367. |
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| 作者姓名： | 赵斌 吕文超 何高文 张宝金 韦振权 宁子杰 张旭东 |
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| 作者单位： | 1.广州海洋地质调查局自然资源部海底矿产资源重点实验室, 广东广州 510075 |
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| 基金项目： | 南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(No.GML2019ZD0106);国家自然科学基金项目(No.41803026);同济大学海洋地质国家重点实验室开放基金项目(Nos.MGK202007,MGK1920);中国大洋协会“十三五”项目(Nos.DY135-C1-1-01,DY135-C1-1-06)。 |
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| 摘 要： | 海山沉积过程与全球气候变化和古海洋演化有着紧密联系，维嘉海山保留了西太平洋晚中生代以来的完整沉积记录，是探索西太平洋海山构造演化的理想场所. 基于浅地层剖面、大洋钻探和最新相关研究成果，通过研究海山的沉积特征、火山活动和沉降速率等，探索西太平洋维嘉海山晚中生代以来的沉积过程. 结果显示维嘉海山顶部发育3个沉积单元，并发现了始新世第二次火山活动的可能证据，推算出维嘉海山中中新世(~11.6 Ma)以来的沉积速率约为6.03 mm/ka. 首次建立了维嘉海山的演化模型，认为维嘉海山演化主要经历了7个阶段，在渐新世之前处于缓慢沉降状态，其顶部水深一直保持在数百米之间，之后出现拐点，早中新世(~20 Ma)之后开始加速沉降，可能与该时期太平洋板块运动方向的迅速转换有关.
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| 关 键 词： | 沉积过程 沉降速率 构造演化 维嘉海山 西太平洋 |
| 收稿时间： | 2020-04-29 |
Sedimentary Processes of Weijia Guyot and Implications for Western Pacific Seamount Evolution |
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| Zhao Bin,Lü Wenchao,He Gaowen,Zhang Baojin,Wei Zhenquan,Ning Zijie,Zhang Xudong.Sedimentary Processes of Weijia Guyot and Implications for Western Pacific Seamount Evolution[J].Earth Science-Journal of China University of Geosciences,2022,47(1):357-367. |
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| Authors: | Zhao Bin Lü Wenchao He Gaowen Zhang Baojin Wei Zhenquan Ning Zijie Zhang Xudong |
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| Institution: | (Ministry of Natural Resources Key Laboratory of Marine Mineral Resources,Guangzhou Marine Geological Survey,Guangzhou 510075,China;Southern Marine Science and Engineering Guangdong Laboratory,Guangzhou 511458,China;China Geological Survey,Beijing 100037,China) |
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| Abstract: | Sedimentary processes of seamounts are closely related to global paleoclimate change and paleoceanography evolution.The Weijia Guyot retained the complete sedimentary records since the Late Mesozoic,which made Weijia Guyot an ideal area for tectonic evolution studies of seamounts in the western Pacific Ocean.Based on the results from sub-bottom profiling,ocean drilling,and the latest research,in this paper it explores the sedimentary process of Weijia Guyot since Late Mesozoic by studying the sedimentary characteristics,volcanic activity and subsidence rate of the seamount.There are three sedimentary units on the summit of Weijia Guyot.Direct evidence of rejuvenated volcanism during Eocene is found in this paper,and deposition rate of Weijia Guyot is determined as approximately 6.03 mm/ka since Middle Miocene(~11.6 Ma).The evolution model of Weijia Guyot is established for the first time,which is being divided into seven main phases.New perspective about the subsidence rate of Weijia Guyot is revealed:the subsidence rate was low before Oligocene,and the water depth at the summit ranged within hundreds of meters;subsequently,the subsidence speeded up during Early Miocene(~20 Ma)after an inflection point,and it may be related to the rapid change of the direction of the Pacific plate movement during this period. |
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| Keywords: | sedimentary process subsidence rate tectonic evolution Weijia Guyot western Pacific Ocean |
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