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科学家通过地震地层流体压力观测首次实现对洋壳性质的直接测定 快报文章
地球科学快报，2021年第24期
作者:  张树良
Microsoft Word(16Kb)  |  收藏  |  浏览/下载：734/0  |  提交时间：2021/12/24
oceanic crust  fluid pressure  seismic wave  CORK  NEPTUNE  
地幔组分形成主要依赖于其与洋壳的相互作用 快报文章
地球科学快报，2020年第19期
作者:  赵纪东
Microsoft Word(51Kb)  |  收藏  |  浏览/下载：440/0  |  提交时间：2020/10/10
Mantle  Mantle composition  Formation mechanism  Oceanic crust  
Decreasing Magnetization, Lithospheric Flexure, and Rejuvenated Hydrothermalism off the Japan-Kuril Subduction Zone 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (9)
作者:  Choe, Hanjin;  Dyment, Jerome
收藏  |  浏览/下载：12/0  |  提交时间：2020/07/02
hydrothermal circulation  marine magnetic anomaly  subduction zone  outer rise  bending oceanic crust  
Recycling and metabolic flexibility dictate life in the lower oceanic crust 期刊论文
NATURE, 2020, 579 (7798) : 250-+
作者:  Zhou, Peng;  Yang, Xing-Lou;  Wang, Xian-Guang;  Hu, Ben;  Zhang, Lei;  Zhang, Wei;  Si, Hao-Rui;  Zhu, Yan;  Li, Bei;  Huang, Chao-Lin;  Chen, Hui-Dong;  Chen, Jing;  Luo, Yun;  Guo, Hua;  Jiang, Ren-Di;  Liu, Mei-Qin;  Chen, Ying;  Shen, Xu-Rui;  Wang, Xi;  Zheng, Xiao-Shuang;  Zhao, Kai;  Chen, Quan-Jiao;  Deng, Fei;  Liu, Lin-Lin;  Yan, Bing;  Zhan, Fa-Xian;  Wang, Yan-Yi;  Xiao, Geng-Fu;  Shi, Zheng-Li
收藏  |  浏览/下载：60/0  |  提交时间：2020/05/13

The lithified lower oceanic crust is one of Earth'  s last biological frontiers as it is difficult to access. It is challenging for microbiota that live in marine subsurface sediments or igneous basement to obtain sufficient carbon resources and energy to support growth(1-3) or to meet basal power requirements(4) during periods of resource scarcity. Here we show how limited and unpredictable sources of carbon and energy dictate survival strategies used by low-biomass microbial communities that live 10-750 m below the seafloor at Atlantis Bank, Indian Ocean, where Earth'  s lower crust is exposed at the seafloor. Assays of enzyme activities, lipid biomarkers, marker genes and microscopy indicate heterogeneously distributed and viable biomass with ultralow cell densities (fewer than 2,000 cells per cm(3)). Expression of genes involved in unexpected heterotrophic processes includes those with a role in the degradation of polyaromatic hydrocarbons, use of polyhydroxyalkanoates as carbon-storage molecules and recycling of amino acids to produce compounds that can participate in redox reactions and energy production. Our study provides insights into how microorganisms in the plutonic crust are able to survive within fractures or porous substrates by coupling sources of energy to organic and inorganic carbon resources that are probably delivered through the circulation of subseafloor fluids or seawater.


  
Depth variations in seismic velocity in the subducting crust: Evidence for fluid-related embrittlement for intermediate-depth earthquakes 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (2)
作者:  Shiina, Takahiro;  Nakajima, Junichi;  Matsuzawa, Toru;  Toyokuni, Genti;  Kita, Saeko
收藏  |  浏览/下载：27/0  |  提交时间：2019/04/09
subducting zone  oceanic crust  guided wave  seismic velocity  intermediate-depth earthquakes  fluid-related embrittelment