Neogene faulting and volcanism in the Victoria Land Basin of the Ross Sea, Antarctica  

作　　者：Mei Yue JinYao Gao ChunFeng Li Chao Zhu XinZhi Fan Guochao Wu ZhongYan Shen Han Shi XiaoXian Cai YiDong Guo 

机构地区：[1]Ocean College,Zhejiang University,Zhoushan 316021,China [2]Key Laboratory of Submarine Sciences,Second Institute of Oceanography,MNR,Hangzhou 310012,China [3]Key Laboratory of Environmental Survey Technology and Application,MNR,Guangzhou 528200,China [4]Sanya Institute,Zhejiang University,Sanya 572000,China [5]Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266061,China

出　　处：《Earth and Planetary Physics》2022年第3期248-258,共11页地球与行星物理（英文版）

基　　金：supported by the Impact and Response of Antarctic Seas to Climate Change Project (IRASCC01-03-01);Hainan Naturtal Science Foundation Inovative Research Team Project (421CXTD441);the National Natural Science Foundation of China (Nos. 42176067, 41576069, 42176055, 41776189 and 41906197)

摘　　要：The Neogene Terror Rift in the Antarctic Victoria Land Basin(VLB)of the Ross Sea,Antarctica,is composed of the Discovery Graben and the Lee Arch.Many Neogene volcanoes are aligned in the north-south direction in the southern VLB,belonging to the McMurdo Volcanic Group.However,due to multiple glaciations and limited seismic data,the volcanic processes are still unclear in the northern VLB,especially in the Terror Rift.Multichannel seismic profiles were collected at the VLB from the 32nd Chinese National Antarctic Research Expedition(CHINARE).We utilized four seismic profiles from the CHINARE and additional historical profiles,along with gravity and magnetic anomalies,to analyze faults and stratigraphic characteristics in the northern Terror Rift and volcanism in the VLB.Negative flower structures found in the northern Terror Rift suggest that the Terror Rift was affected by dextral strike-slip faults extending from the northern Victoria Land(NVL).After the initial orthogonal tension,the rift transited into an oblique extension,forming a set of downward concaving normal faults and accommodation zones in the Terror Rift.On the Lee Arch,several imbricated normal faults formed and converged into a detachment fault.Under gravitational forces,the strata bent upward and formed a rollover anticline.Many deep faults and thin strata subjected to erosion facilitated volcanic activity.A brittle volcanic region in the VLB was affected by dextral strike-slip movements and east-west extension,resulting in two Neogene volcanic chains that connect three igneous provinces in the VLB:the Hallett,Melbourne,and Erebus Provinces.These two chains contain mud volcanoes with magnetic nuclei,volcanic intrusions,and late-stage volcanic eruptions.Volcanisms have brought about opposite polarities of magnetic anomalies in Antarctica,indicating the occurrence of multiple volcanic activities.

关 键 词：Victoria Land Basin Terror Rift seismic stratigraphy gravity and magnetic modeling FAULTING Neogene volcanic intrusion 

分 类 号：P941.61[天文地球—自然地理学] P317