检索结果-南通市图书馆

Journal of Ocean University of China 2024年第4期23卷 933-942页

作者： AN Long XU Chong XING Junhui GONG Wei jiang xiaodian XU Haowei LIU Chuang YANG Boxue jiangsu Automation Research Institute Lianyungang 222061China Key Laboratory of Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Qingdao Marine Science and Technology CenterQingdao 266071China

The chirp sub-bottom profiler,for its high resolution,easy accessibility and cost-effectiveness,has been widely used in acoustic *** this paper,the acoustic impedance and grain size compositions were obtained based on the chirp sub-bottom profiler data collected in the Chukchi Plateau area during the 11th Arctic Expedition of *** time-domain adaptive search matching algorithm was used and validated on our established theoretical *** misfit between the inversion result and the theoretical model is less than 0.067%.The grain size was calculated according to the empirical relationship between the acoustic impedance and the grain size of the *** average acoustic impedance of sub-seafloor strata is 2.5026×10^(6) kg(s m^(2))^(-1)and the average grain size(θvalue)of the seafloor surface sediment is 7.1498,indicating the predominant occurrence of very fine silt sediment in the study *** of the inversion results and the laboratory measurements of nearby borehole samples shows that they are in general agreement.

关键词： time domain adaptive search matching algorithm acoustic impedance inversion sedimentary grain size Arctic Ocean Chukchi Deep Sea Basin

Seabed Physical Parameter Research Based on Active-Source OBS Data in the Chukchi Sea Shelf of the Arctic

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2023年第3期22卷 675-682页

作者： ZHEN Sheng XING Junhui jiang xiaodian Key Laboratory of Submarine Geosciences and Prospecting Techniques MOE and College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266071China

The acquisition of seabed physical parameters is one of the focuses of marine acoustic ***,the activesource ocean bottom seismometer(OBS)detection method in the marine geophysical research is rarely used to acquire seabed physical parameters,and less work is performed in the *** this study,two active-source OBS data collected from the 9th and 11th Chinese National Arctic Research Expedition(CHINARE)are selected to obtain the physical parameters of seabed *** kinds of energy spark are used as the active sources,while the cost function inversion method is used based on the arrival time difference between the reflected and direct *** thickness and sound velocity of the sediment layers are obtained by inversion,and the empirical formula is used to calculate the physical parameters of the seabed sediment,which are compared with the measured *** cost function inversion method based on the time difference of arrival of the reflected and direct waves is tested to be effective and feasible in the inversion of seabed parameters from active-source OBS *** method is further applied to obtain the physical parameters of Chukchi seabed sediments,which provides the idea and reference for the application of marine geophysical activesource OBS detection technology in the inversion of polar seabed physical parameters.

关键词： physical parameters of seafloor sediments ocean bottom seismometer(OBS) Arctic Chukchi Sea

Thermo-Rheological Structure and Passive Continental Margin Rifting in the Qiongdongnan Basin, South China Sea, China

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of China 2022年第2期21卷 347-360页

作者： LI Chaoyang jiang xiaodian GONG Wei School of Ocean Science and Technology Dalian University of TechnologyPanjin 124221China Key Laboratory of Submarine Geosciences and Prospecting Techniques Ministry of Educationand College of Marine GeosciencesOcean University of ChinaQingdao 266100China Laboratory for Marine Mineral Resources Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China

To investigate the thermo-rheological structure and passive continental margin rifting in the Qiongdongnan Basin(QDNB),thermo-rheological models of two profiles across the western and eastern QDNB are *** continental shelf of western QDNB,having the lowest crustal extension factor,is recognized as the initial non-uniform extension crust *** regime is referred to as the jelly sandwich-1(JS-1)regime,having a lower crustal ductile *** oceanward part of the western QDNB changes from the relatively strong JS-1 to the weak crème brûlée-1(CB-1)regime with a significantly thinned lower ***,the crustal extension in the eastern QDNB is significantly higher than that in the western QDNB,with conjugate faults extending deep into the lower *** central depression zone of the eastern QDNB is defined as the much stronger JS-2 regime,having a brittle deformation across the entire crust and upper mantle and characteristics of a cold and rigid oceanic *** the widespread lower crustal high-velocity layers(HVLs)in the northern margin of the South China Sea,the HVLs are confined to the lower crustal base of the central depression zone of the *** HVLs of QDNB are the results of non-uniform extension with mantle underplating during the lower crustal-necking stage,which is facilitated by the lower crustal ductile layer and derived by mantle lat-eral *** gigantic mantle low-velocity zone related to the Red River Fault should be a necessary factor for the east-west differential margin rifting process of QDNB,which may drive the lateral flowing in the mantle.

关键词： Qiongdongnan Basin thermo-rheological structure continental margin rifting high-velocity layer

Geochemistry of the Paleocene Clastic Rocks in Lishui Sag, East China Sea Shelf Basin： Implications for Tectonic Background and Provenance

在线全文

学校读者我要写书评

暂无评论

Acta Geologica Sinica(English Edition) 2016年第1期90卷 166-181页

作者： LI Deyong jiang xiaodian XU Fa LIU Jinshui HOU Guowei College of Marine Geosciences Ocean University of ChinaQingdao 266100ShandongChina Key Lab of Submarine Geosciences and Prospecting Techniques Ministry of EducationQingdao 266100ShandongChina Shanghai Branch China National Offshore Oil Co.Ltd.Shanghai 200030China

The Lishui Sag, in the East China Sea Shelf Basin, is rich in hydrocarbons, with the major hydrocarbon-bearing layers being the Paleocene Mingyuefeng clastic rocks. Analysis of the implicit geologic background information of these Paleocene clastic rocks using petrological and geochemical methods has significant practical importance. These Paleocene sandstones are mainly lithic arenite, lithic arkose and greywacke, composed of K-feldspar, plagioclase, authigenic clays, silica and carbonates. As continental deposits, Yueguifeng clastic rocks have high aluminosilicate and mafic detritus contents, while the Lingfeng and Mingyuefeng Formations are rich in silica due to an oscillating coastal marine depositional environment. The major element contents of these Paleocene sandstones are low and have a concentrated distribution, indicating that the geochemical composition is non-epigenetic, transformed by sedimentary processes and diagenesis. The Yueguifeng detritus comprises recycled sediments, controlled by moderate weathering and erosion, while the Lingfeng and Mingyuefeng detritus is interpreted as primarily first-cycle materials due to low chemical weathering. In the Late Cretaceous to Early Paleocene, the Pacific Plate began subducting under the Eurasian Plate, causing an orogeny by plate collision and magma eruption due to the melting of subducted oceanic crust. This resulted in the dual tectonic settings of ＂active margin＂ and ＂continental island arc＂ in the East China Sea Shelf Basin. During the Late Paleocene, the Pacific Plate margin migrated eastward along with development of the Philippine Ocean Plate, and the tectonic setting of the Lishui Sag gradually turned into a passive continental margin. Detrital sources included both orogenic continental blocks and continental island arcs, and the parent rocks are primarily felsic volcanic rocks and granites.

关键词： geochemistry Paleocene tectonic background provenance Lishui sag

在线全文

学校读者我要写书评

暂无评论

扰动重力梯度的球冠谐分析建模

测绘学报 2017年第11期46卷 1802-1811页

作者：王燚姜效典中国海洋大学海洋地球科学学院山东青岛266100

从球冠谐理论出发,详细推导了球冠坐标系下扰动重力梯度的无奇异性计算公式。基于Tikhonov正则化方法,利用GOCE卫星实际观测数据解算局部重力场球冠谐模型。数值计算表明,基于扰动重力梯度的球冠谐分析建模方法能够有效地恢复局部重力... 详细信息

从球冠谐理论出发,详细推导了球冠坐标系下扰动重力梯度的无奇异性计算公式。基于Tikhonov正则化方法,利用GOCE卫星实际观测数据解算局部重力场球冠谐模型。数值计算表明,基于扰动重力梯度的球冠谐分析建模方法能够有效地恢复局部重力场中的短波信号,与GO_CONS_GCF_2_DIR_R5模型的差异在±0.3×10^(-5) m/s^2水平。

关键词：球冠谐和分析扰动重力重力梯度 Tikhonov正则化方法

哀牢山-红河断裂带哀牢山-大象山段渐新世-早中新世热史演化及成因

在线全文

学校读者我要写书评

暂无评论

地球科学（中国地质大学学报） 2017年第2期42卷 223-239页

作者：宫伟姜效典中国海洋大学海洋地球科学学院山东青岛266100 海底科学与探测技术教育部重点实验室山东青岛266100

哀牢山-红河断裂带范围内样品热史演化的系统构建工作偏少;部分学者往往将样品的冷却年龄简单地归因于断裂带的事件年龄,而没有考虑热扰动因素,致使以往研究结论仍然存在分歧及不合理之处.利用断裂带中高温测年资料,构建了Tt变化曲线,... 详细信息

哀牢山-红河断裂带范围内样品热史演化的系统构建工作偏少;部分学者往往将样品的冷却年龄简单地归因于断裂带的事件年龄,而没有考虑热扰动因素,致使以往研究结论仍然存在分歧及不合理之处.利用断裂带中高温测年资料,构建了Tt变化曲线,结合压力-温度-深度(P-T-D)变化趋势及地层恢复,对T-t变化的成因提出了较为合理的解释.中高温热史演化表明断裂带SE端(大象山段)与NW端(哀牢山段)皆经历2期冷却过程;在地层剥蚀或构造剥露作用诱导下,SE端、NW端于32~30Ma、32~22Ma分别经历第1期冷却过程,而其在26~24Ma、22~20Ma分别经历的第2期冷却过程中,由于断裂活动减弱这一因素,致使该期冷却速率明显增大(尤其是断裂带NW端).伴随着印支地块的顺时针旋转挤出,断裂带中南部左旋转换拉张构造活动向北迁移.在断裂带T-t演化的第1个阶段内,受断裂带转换拉张强度NW向减弱的影响,断裂带SE端正断活动所致的山体隆升效应明显强于NW端,致使SE端样品冷却过程较早,同时冷却速率明显偏大;而在第2个阶段,伴随着青藏高原进入中新世早期的隆升阶段,作为高原东南缘板块调节边界的哀牢山-红河断裂带其活动性由SE端开始减弱,使得冷却过程由SE端向NW端传递.

关键词：哀牢山-红河断裂带渐新世中新世左旋走滑地层剥蚀断裂活动热年代学

A New Model of Lithosphere Deformation Beneath the Okinawa Trough Based on Gravity Data

在线全文

学校读者我要写书评

暂无评论

Journal of Ocean University of Qingdao 2002年第2期1卷 165-170页

作者： ZHAO Lihong jiang xiaodian ZHANG Weigang College of Marine Geoscience Ocean University of QingdaoQingdao 266003P.R.China

The Ryukyu trench-arc system can be divided into two types according to its subduction model. The normal subduction in the northern part of the Philippine Sea plate creates a hinge sedimentary wedge with large deformation at the collision front, while the oblique subduction in the southern part gives rise to a smaller accretion with small deformation than that in the northern part. The mechanisms that cause the distinction between these two types have been analysed and calculated by using gravity data based on the lithosphere rheology and the stress state of the lithosphere in the subduction boundary. The two types of subduction model are associated with the internal extension in the southern Okinawa Trough and the small extension in the northern part. The difference of the stress state between the two types of subduction model is also manifested in other tectonic features, such as topography, volcanic activity and crust movement. Modeling bathymetric and gravity data from this area suggests that the oblique subduction of low angle, together with smooth geometry of the overlying plate crust, results in small stress released on the south of the trench by the subduction plate. The intraplate faults in the southern Okinawa Trough behind the trench stand in surplus intensive stress. On the other hand, the normal subduction of high angle, together with strong undulation geometry of the overlying crust, results in more intensive stress released in the northern Ryukyu Trench than that in the south. The intraplate faults in the northern Okinawa Trough behind the northern Ryukyu Trench stand in small stress.

关键词： Okinawa Trough crustal extension plate boundary subduction model lithosphere strength Ryukyu trench-arc system

青藏高原隆升与南海开启:南海西北部盆-山耦合体系

在线全文

学校读者我要写书评

暂无评论

地学前缘 2017年第4期24卷 268-283页

作者：宫伟李朝阳姜效典中国海洋大学海洋地球科学学院山东青岛266100 海底科学与探测技术教育部重点实验室山东青岛266100

青藏高原和南海分别是地球上最高的高原、东亚大陆边缘最大的边缘海,是地理位置紧邻的两个特殊地质单元。纵观青藏高原的隆升、挤出与南海的动力演化过程,二者存在一定的关联耦合性,而红河断裂带作为二者之间的纽带,直接控制了南海西北... 详细信息

青藏高原和南海分别是地球上最高的高原、东亚大陆边缘最大的边缘海,是地理位置紧邻的两个特殊地质单元。纵观青藏高原的隆升、挤出与南海的动力演化过程,二者存在一定的关联耦合性,而红河断裂带作为二者之间的纽带,直接控制了南海西北部陆缘岩石圈裂解及盆地的构造迁移和演化过程,并制约了盆地沉积地层充填和烃源岩的形成、分布,使得青藏高原与南海西北部盆地构成最为显著的盆-山耦合体系。由于区域动力背景的多层次性、多因素性及多变性,对于南海多期次多轴向复杂的构造特征及南海西北部陆缘新生代盆地构造沉积过程,与高原隆升、块体挤出的时空关系,至今无法给出完美的解释。综合前人研究成果,本文试图理清青藏隆升、挤出与南海形成演化过程的关系,总结现阶段研究中面临的诸多问题,在此基础上对未来的研究方向做出展望,以期促进对青藏隆升、块体挤出与南海盆地演化三者关系的合理理解。

关键词：青藏隆升南海开启红河断裂带莺歌海—琼东南盆地盆山耦合

利用磷灰石裂变径迹约束断裂活动时限的制约因素

在线全文

学校读者我要写书评

暂无评论

海洋地质与第四纪地质 2015年第2期35卷 101-109页

作者：宫伟姜效典中国海洋大学海洋地球科学学院青岛266100

磷灰石裂变径迹作为一种低温热史重建的研究手段,现已用来约束断裂带的活动时限。但是,通过分析发现,在磷灰石裂变径迹——断裂带活动时限研究过程中仍然存在诸多制约因素,以致对研究结果造成比较大的干扰。其中,诸如矿物自身特征(如矿... 详细信息

磷灰石裂变径迹作为一种低温热史重建的研究手段,现已用来约束断裂带的活动时限。但是,通过分析发现,在磷灰石裂变径迹——断裂带活动时限研究过程中仍然存在诸多制约因素,以致对研究结果造成比较大的干扰。其中,诸如矿物自身特征(如矿物成分、各向异性等)、实验操作及解译模型的选取,这都无疑增加了磷灰石热史重建的难度;岩石热导率、火山等构造活动、地层孔隙水含量等因素,更是造成了地温变化的多种解释;在目标断裂构造运动解译过程中,更是需要排除气候、周边断层构造活动的影响。最后以实验操纵、自然热冷却、周边断层构造运动因素为例,基于前人研究提出相应的解决方法,尽量消除上述影响因素关于断裂带研究的干扰,以提高解释的科学性、合理性。

关键词：磷灰石裂变径迹断裂带活动时限影响因素

在线全文

学校读者我要写书评

暂无评论

地球重力场球冠谐模型的分层构造和分析

大地测量与地球动力学 2014年第5期34卷 30-34,39页

作者：王燚姜效典中国海洋大学海洋地球科学学院青岛266100

根据球冠谐系数与点质量模型的关系,提出一种基于多层点质量模型分层构造球冠谐系数的方法。以32°N^34°N,102°E^104°E为计算区域,利用EGM2008模型和实测观测值构造三层球冠谐模型系数,逼近该区域的重力异常场。结果表明,使用本方法... 详细信息

根据球冠谐系数与点质量模型的关系,提出一种基于多层点质量模型分层构造球冠谐系数的方法。以32°N^34°N,102°E^104°E为计算区域,利用EGM2008模型和实测观测值构造三层球冠谐模型系数,逼近该区域的重力异常场。结果表明,使用本方法构造的球冠谐模型和实测观测值的误差平均值小于0.5×10-5ms-2,当拟合区域的球冠半角为0.71°时,模型的内符合精度为±4.65×10-5ms-2。

关键词：球冠谐和分析 EGM2008模型点质量模型迭代算法病态性