Discovery and characterization of a new hydrothermal field at 2°N on the slow-spreading Carlsberg Ridge  

作　　者：Zhongyan QIU Yejian WANG Xiqiu HAN Honglin LI Xing YU Ruyong CUI Mou LI Xuegang CHEN Jiqiang LIU 

机构地区：[1]Key Laboratory of Submarine Geosciences&Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China [2]Qingdao Institute of Marine Geology,China Geological Survey,Qingdao 266071,China [3]School of Earth Science,Zhejiang University,Hangzhou 310027,China [4]Ocean College,Zhejiang University,Zhoushan 316021,China

出　　处：《Journal of Oceanology and Limnology》2024年第4期1106-1118,共13页海洋湖沼学报（英文）

基　　金：Supported by the National Natural Science Foundation of China(No.41976075);the National Key Research and Development Program of China(No.2021YFF0501302);the Fundamental Research Funds for National Non-profit Institute Grant(No.JG 2103);the China Ocean Mineral Resources R&D Association Project(No.DY135-S 2-1-03)。

摘　　要：A new hydrothermal field(Tianshi)was discovered on the rift valley wall through plume anomaly surveys and geological work conducted in 2012 and 2018 between 2°35′N and 2°43′N of the slow-spreading Carlsberg Ridge(CR).Here,the results of two expeditions conducted to detect and characterize the new hydrothermal field are reported.Mineralogical and geochemical data,as well as 14 C ages of a sediment core collected near the field are presented to reveal the hydrothermal history.Results show that the Tianshi field is a basalt-hosted hydrothermal system.Geochemical data of the sediments collected near the field indicate a strong hydrothermal contribution,and hydrothermal Fe and Cu fluxes range from 30 to 155 mg/(cm^(2)·ka)and 0.59 to 11.49 mg/(cm^(2)·ka),respectively.Temporal variations in the fluxes of hydrothermal Fe indicate that there have been at least three amplified hydrothermal venting events(H 1,H 2,and H 3)in the Tianshi field over the last 35.2 ka,in 28.6-35.2 ka BP,22.0-27.6 ka BP,and 1.2-11.4 ka BP,respectively.Hydrothermal event H 2 was driven by an increased magmatic production associated with sea level fall during the Last Glacial Maximum,while event H 3 was promoted by tectonic activity associated with a rapid sea level rise.This study further verified the role of sea level change in modulating hydrothermal activity on mid-ocean ridges.

关 键 词：plume anomaly sediment core new hydrothermal field hydrothermal history Carlsberg Ridge 

分 类 号：P618.13[天文地球—矿床学] P314[天文地球—地质学]