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Gravity modelling of crustal architecture and heterogeneity in the Nansha Block,South China Sea

Journal of Oceanology and Limnology 2023年第2期41卷 630-643页

作者： Jialing ZHANG zhaocai wu Chun-Feng LI Hailong LI Key Laboratory of Submarine Geoscience Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Department of Marine Science Zhejiang UniversityZhoushan 316021China Sanya Institute Zhejiang UniversitySanya 572025China Laboratory of Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China

The stretched structure and heterogeneity of the crust of the Nansha Block,the southern continental margin of the South China Sea(SCS),are not well *** used published ocean bottom seismic(OBS)/multichannel reflection seismic(MCS)profiles across the Nansha Block to establish five two-dimensional crustal structure *** gravity modelling with magnetic anomaly inversion,we obtained the distribution of density and local magnetic susceptibility of the *** models show that the distribution of density and thickness of the upper crust in the Nansha Block is uneven,and the thick upper crust is prevalent in the regions close to the continent-ocean transition(COT)showing different *** interpreted Mesozoic granite blocks and Precambrian rigid basement reflects the heterogeneity in the material composition of the SCS continental *** on the thinning styles of different crustal layers,we suggest that the Nansha Block has a three-layer thinning *** uppermost pre-rift layer was deformed via brittle fractures,the upper crust was sheared by discrete shear zones,and the lower crust experienced ductile *** inherited pre-rift thermal regime,mechanical state,and material composition of the SCS continental margin affected the extensional structure of the crust.

关键词： Nansha Block crustal architecture gravity inversion crustal boudinage

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Effective Elastic Thickness of the Lithosphere in the Mariana Subduction Zone and Surrounding Regions and Its Implications for Their Tectonics

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Journal of Ocean University of China 2022年第4期21卷 827-836页

作者： LING Zilong ZHAO Lihong wu zhaocai ZHI Pengyao DING Renwei College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590China Second Institute of Oceanography Ministry of Nature ResourcesHangzhou 310012China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and TechnologyQingdao266237China

To understand the rheology,structure,and tectonics of the lithosphere in the Mariana subduction zone and surrounding regions,we calculated the effective elastic thickness of the lithosphere(Te)in these areas using the improved moving window admittance technique(MWAT)*** find that smaller data grid spacing can better reflect Te variations in the subduction *** Te of the study region ranges from 0 to 47 *** Te is reduced from 40 km on the seaward side of the outer-rise region to 1-2 km along the trench *** lithospheric breaking distance from the trench axis ranges from 0 to 250 *** suggest that the intermediate Te values in seamounts and high Te values on the seaward side of the outer-rise region respectively reflect the‘fossil’rheological state and current lithospheric strength of the Pacific *** faulting induced by the downward bending of subducting plate not only ruptures the lithosphere but also contributes to the mantle serpentinization,significantly reducing the lithospheric *** largest breaking distance of the Ogasawara Plateau may be due to the increase in the mass load of the subducting plate in the Ogasawara Plateau and the significant horizontal bending force in the plate caused by the resistance of seamounts to ***,a good positive correlation exists between the breaking distance and subduction dip angle along the trench *** suggest that the subducting plate with a larger breaking distance is likely to form a larger subduction angle.

关键词： effective elastic thickness moving window admittance technique Mariana subduction zone plate bending

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Three-dimensional constrained gravity inversion of Moho depth and crustal structural characteristics at Mozambique continental margin

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Acta Oceanologica Sinica 2024年第2期43卷 120-129页

作者： Shihao Yang zhaocai wu Yinxia Fang Mingju Xu Jialing Zhang Fanlin Yang College of Geodesy and Geomatics Shandong University of Science and TechnologyQingdao 266590China Key Laboratory of Submarine Geoscience Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China School of Geomatics and Municipal Engineering Zhejiang University of Water Resources and Electric PowerHangzhou 310018China Ocean College Zhejiang UniversityZhoushan 316021China

Mozambique's continental margin in East Africa was formed during the break-off stage of the east and west Gondwana lands. Studying the geological structure and division of continent-ocean boundary(COB) in Mozambique's continental margin is considered of great significance to rebuild Gondwana land and understand its movement mode. Along these lines, in this work, the initial Moho was fit using the known Moho depth from reflection seismic profiles, and a 3D multi-point constrained gravity inversion was carried out. Thus, highaccuracy Moho depth and crustal thickness in the study area were acquired. According to the crustal structure distribution based on the inversion results, the continental crust at the narrowest position of the Mozambique Channel was detected. According to the analysis of the crustal thickness, the Mozambique ridge is generally oceanic crust and the COB of the whole Mozambique continental margin is divided.

关键词： 3D constrained gravity inversion continent-ocean boundary Mozambique continental margin Moho depth

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The deep structure of the Duanqiao hydrothermal field at the Southwest Indian Ridge

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Acta Oceanologica Sinica 2018年第3期37卷 73-79页

作者： SUN Chaofeng wu zhaocai TAO Chunhui RUAN Aiguo ZHANG Guoyin GUO Zhikui HUANG Enxian Key Laboratory of Submarine Geosciences State Oceanic AdministrationHangzhou 310012China Second Institute of Oceanography State Oceanic AdministrationHangzhou 310012China Institute of Geophysics and Geomatics China University of OceanographyWuhan 430074China Henan Province Earthquake Administration Zhengzhou 450016China

Polymetalic sulfide is the main product of sea-floor hydrothermal venting, and has become an important sea-floor mineral resources for its rich in many kinds of precious metal elements. Since 2007, a number of investigations have been carried out by the China Ocean Mineral Resources Research and Development Association（COMRA）cruises（CCCs） along the Southwest Indian Ridge（SWIR）. In 2011, the COMRA signed an exploration contract of sea-floor polymetallic sulfides of 10 000 km2 on the SWIR with the International Seabed Authority. Based on the multibeam data and shipborne gravity data obtained in 2010 by the R/V Dayang Yihao during the leg 6 of CCCs21, together with the global satellite surveys, the characteristics of gravity anomalies are analyzed in the Duanqiao hydrothermal field（37°39′S, 50°24′E）. The ＂subarea calibration＂ terrain-correcting method is employed to calculate the Bouguer gravity anomaly, and the ocean bottom seismometer（OBS） profile is used to constrain the two-dimensional gravity anomaly simulation. The absent Moho in a previous seismic model is also *** results show that the crustal thickness varies between 3 and 10 km along the profile, and the maximum crustal thickness reaches up to 10 km in the Duanqiao hydrothermal field with an average of 7.5 km. It is by far the most thicker crust discovered along the SWIR. The calculated crust thickness at the Longqi hydrothermal field is approximately 3 km, 1 km less than that indicated by seismic models, possibly due to the outcome of an oceanic core complex（OCC）.

关键词： crustal thickness Duanqiao hydrothermal field gravity anomaly polymetallic sulfides Southwest Indian Ridge

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The geomorphological features and continuity of the Kyushu-Palau Ridge (KPR)

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Acta Oceanologica Sinica 2011年第5期30卷 114-124页

作者： TANG Yong LI Mingbi LI Jiabiao wu zhaocai China University of Geosciences Wuhan 430074 China The Second Institute of Oceanography State Oceanic Administration Hangzhou 310012 China

The Philippine Basin,surrounded by a series of oceanic trenches,is an independent deep ocean basin in the West Pacific *** middle part is divided into three marginal sea sub-basins by the Kyushu-Palau and West Mariana Ridges,namely,the West Philippine Basin,the Shikoku and Parece Vela Basins and the Mariana *** paper,through the analysis of the geomorphologic features and gravity and magnetic characteristics of the basin and identification of striped magnetic anomalies,suggests that the entire Philippine Basin developed magnetic lineation of oceanic nature,and therefore,the entire basin is of the nature of oceanic *** basin has developed a series of special geomorphic units with different *** KPR runs through the entire Philippine *** the view of geomorphologic features,the KPR is a discontinuous seamount chain （chain-shaped seamounts） and subduction beneath the Japanese Island arc at the Nankai Trough which is the natural boundary between the basin and the Japanese Island *** the positions of 25 N,24 N,23 N and 18 N,obvious discontinuity is shown,which belongs to natural topographic ***,the KPR is topographically discontinuous.

关键词： Kyushu-Palau Ridge (KPR) Philippine Basin Seamount chain (chain-shaped seamounts)

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Mantle melting factors and amagmatic crustal accretion of the Gakkel ridge, Arctic Ocean

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Acta Oceanologica Sinica 2015年第6期34卷 42-48页

作者： ZHANG Tao GAO Jinyao CHEN Mei YANG Chunguo SHEN Zhongyan ZHOU Zhiyuan wu zhaocai SUN Yunfan Key Laboratory of Submarine Geosciences State Oceanic Administration Second Institute of Oceanography State Oceanic Administration East China Construction Engineering Corporation of Zhejiang School of Ocean and Earth Science Tongji University

Spreading rate is a primary factor of mantle melting and tectonic behavior of the global mid-ocean ridges. The spreading rate of the Gakkel ridge decreases gradually from west to east. However, the Gakkel ridge can be divided into four thick-and-thin zones with varying crustal thicknesses along ridge axis. This phenomenon indicates that mantle melting of the Gakkel ridge is not a simple function of spreading rate. Mantle temperature, water content, mantle composition, and other factors are important in crustal accretion processes. Based on gravity-derived crustal thickness and wet melting model, we estimate that the mantle potential temperatures of the four zones are 1 270, 1 220, 1 280, and 1 280℃ （assuming that mantle water content equals to global average value）, with corresponding mantle water contents of 210, 0, 340, and 280 mg/kg （assuming that mantle potential temperature is 1 260℃）, respectivly. The western thinned crust zone is best modeled with low mantle temperature, whereas the other zones are mainly controlled by the enhanced conduction caused by the slower spreading rate. Along the Gakkel ridge, the crustal thickness is consistent with rock samples types. Predominated serpentinized peridotite and basalt are found in the area with crustal thickness 〈1.5 km and 〉2.5 km, respectively. The rock samples are including from basalt to peridotite in the area with crustal thickness between 1.5 and 2.5 km. Based on this consistency, the traditional magmatic accretion zone accounted for only 44% and amagmatic accretion accounted for 29% of the Gakkel ridge. The amagmatic accretion is a significant characteristic of the ultra-slow spreading ridge.

关键词： Gakkel ridge residual mantle bouguer anomaly crustal thickness wet melting amagmatic accretion

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双气室铯光泵磁力仪设计与验证

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光学精密工程 2023年第9期31卷 1325-1334页

作者：黄艺明李绍良骆曼箬吴招才刘华上海交通大学电子信息与电气工程学院上海200240 上海航天控制技术研究所上海惯性工程技术研究中心上海201109 自然资源部第二海洋研究所浙江杭州310012

由于自激振荡式单气室光泵磁力仪受移相电路限制测量范围较窄,对双气室光泵磁力仪进行集成化研究和改进,基于对光泵磁力仪基本原理的推导论证,提出了双气室铯光泵磁力仪的一种高度集成的设计结构。该方案中以垂直腔面发射激光器作为泵... 详细信息

由于自激振荡式单气室光泵磁力仪受移相电路限制测量范围较窄,对双气室光泵磁力仪进行集成化研究和改进,基于对光泵磁力仪基本原理的推导论证,提出了双气室铯光泵磁力仪的一种高度集成的设计结构。该方案中以垂直腔面发射激光器作为泵浦光源,以刀锋直角棱镜反射镜作为分光镜片,其余元件沿光轴对称排布,利用左旋、右旋圆偏振光的双泵浦光结构和双气室布置实现相移互补,不需要移相电路。利用搭建的原理样机测得实验环境下地磁场强度为37586.79 nT,并利用扫描方式测得三轴分量。双气室铯光泵磁力仪原理样机的测量范围为25700~77000 nT,灵敏度约为20 pT/(Hz)1/2。实验结果和对比测量结果、理论计算结果相吻合,验证了双气室光泵磁力仪的理论分析,证实了该双气室光泵磁力仪结构的可行性和精确度。

关键词：地磁场光泵磁力仪磁共振双气室测量范围集成化

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Progress in Antarctic marine geophysical research by the Chinese Polar Program

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Advances in Polar Science 2017年第4期28卷 256-267页

作者： GAO Jinyao SHEN Zhongyan YANG Chunguo WANG Wei JI Fei wu zhaocai NIU Xiongwei DING Weifeng LI Dongxu ZHANG Qiao Key Laboratory of Submarine Geosciences State Oeanic Administration (SOA) Second Institute of Oceanography SOA Department of Earth Sciences Zhejiang University Chinese Antarctic Center of Surveying and Mapping Wuhan University

Marine geophysical survey by the Chinese National Antarctic Research Expedition （CHINARE） began with the first science expedition in 1984/1985, although only four cruises were performed in the vicinity of the Antarctic Peninsula between then and 1991/1992. After a 20 year hiatus, Antarctic marine geophysical research was relaunched by the Chinese Polar Environmental Comprehensive Investigation and Assessment Programs （known simply as the Chinese Polar Program） in 2011/2012. Integrated geophysical surveys have been carried out annually since, in Prydz Bay and the Ross Sea. During the last 5 years, we have acquired about 5500 km of bathymetric, gravimetric, and magnetic lines; more than 1800 km of seismic reflection lines; and data from several heat flow and Ocean Bottom Seismometer （OBS） stations. This work has deepened understandings of geophysical features and their implications for geological tectonics and glacial history in Antarctica and its surrounding seas. Compiled Antarctic Bouguer and Airy isostatic gravity anomalies show different features of tectonics between the East Antarctic stability and West Antarctic activity. Calculated magnetic anomalies, heat flow anomalies and lithospheric anisotropy offshore of Prydz Bay may imply high heat capacity of mantle shielded by the continental shelf lithosphere, but high heat dissipation of mantle due to the Cretaceous breakup of Gondwana along the continent and ocean transition （COT）, where large sediment ridges would be brought about by the Oligocene ice sheet retreat and would enlarge free-air gravity anomalies. In the western Ross Sea, CHINARE seismic profiles indicate northern termination of the Terror Rift and deposition time of the grounding zone wedge in the northern JOIDES Basin.

关键词： marine geophysics Chinese Polar Program Antarctica gravity magnetics seismic strata Prydz Bay Ross Sea

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光泵磁力仪中垂直腔面发射激光器激光波长锁定

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上海交通大学学报 2024年第4期58卷 438-448页

作者：骆曼箬李绍良黄艺明张弛吴招才刘华上海交通大学电子信息与电气工程学院上海200240 上海航天控制技术研究所上海空间智能控制技术重点实验室上海201109 自然资源部第二海洋研究所杭州310012

针对光泵磁力仪(OPM)对小型化、低功耗以及激光光源波长稳定性的要求,提出一套垂直腔面发射激光器激光波长锁定控制方案.所提基于多普勒吸收的光反馈波长锁定方案以133 Cs原子D1线F_(g)=4→F_(e)=3超精细能级跃迁波长为参考波长,OPM的... 详细信息

针对光泵磁力仪(OPM)对小型化、低功耗以及激光光源波长稳定性的要求,提出一套垂直腔面发射激光器激光波长锁定控制方案.所提基于多普勒吸收的光反馈波长锁定方案以133 Cs原子D1线F_(g)=4→F_(e)=3超精细能级跃迁波长为参考波长,OPM的原子蒸汽气室同时作为波长锁定的工作气室,无需任何额外装置即可将激光波长锁定在该D1线跃迁波长.使用数字比例积分微分控制与模糊控制算法进行激光的温度控制,使温度波动在±0.005℃内;采用基于电流镜的激光电流驱动方案,使电流波动在±50 nA内,为激光波长锁定提供了良好的硬件基础.最后,在实验室环境下实现OPM长达2 h的稳定信号输出.

关键词：光泵磁力仪垂直腔面发射激光器波长锁定激光稳频

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中国东部海域居里面深度特征

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山东科技大学学报（自然科学版） 2019年第4期38卷 10-17页

作者：张超赵俐红吴招才山东科技大学地球科学与工程学院山东青岛266590 中国冶金地质总局青岛地质勘查院山东青岛266109 自然资源部第二海洋研究所海底科学重点实验室浙江杭州310012

通过对中国东部海域高精度的船测磁力数据的二阶小波逼近结果采用功率谱法,计算得到该区域的居里面深度特征。中国东部海域居里面深度16.8~36.6km,在构造环境稳定、地壳厚度正常的区域,如苏北—南黄海盆地、东海陆架盆地,居里面深度在2... 详细信息

通过对中国东部海域高精度的船测磁力数据的二阶小波逼近结果采用功率谱法,计算得到该区域的居里面深度特征。中国东部海域居里面深度16.8~36.6km,在构造环境稳定、地壳厚度正常的区域,如苏北—南黄海盆地、东海陆架盆地,居里面深度在28km以上且起伏变化平缓,可能与相对较弱的中、新生代构造活动有关;在构造活动区边缘或者中、新生代造山系,如渤海盆地、千里岩隆起区及冲绳海槽,居里面则以上隆为特征。其中南黄海中部隆起居里面深度西部下凹而东部相对上隆,可能是古陆核与岩浆侵入的综合反映;而东海的居里面深度则呈现与构造区划相一致的“东西分带”特征。另外,区内居里面深度与热流、地温梯度的自相关系数(Pearson相关系数)分别为-0.3896与-0.5160,显示出居里点深度与热流值间的弱负相关性及其与地温梯度间的中等程度负相关性特征。

关键词：功率谱小波多尺度分解居里面热流

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