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冲绳海槽及其邻域地球物理场与地壳结构特征 总被引:8,自引:3,他引:8
分析了冲绳海槽及其邻域的重、磁场特征,同时对研究区域的布格重力数据进行了上延拓及二次垂直导数计算.根据分析与计算可知,在冲绳海槽及其周边区域,重磁异常的主要走向为NNE向,重、磁场的分布特征表明冲绳海槽及邻域地球物理场变化复杂,变化幅度大.参考地震解释结果,利用重力资料,应用调和级数法对研究区的莫霍界面进行了反演计算,得到了该地区莫霍界面深度分布,计算表明冲绳海槽及邻域地区莫霍界面深度在28-4km之间变化,地壳厚度自西向东逐渐减薄,显示出陆壳-过渡壳-洋壳的转变过程. 相似文献
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用冲绳海槽地区地质、地球物理、地球化学数据与资料,对横跨大陆边缘—大洋板块的中国东部—冲绳海槽—琉球岛弧地区进行综合研究. 根据地震体波、面波成像结果,空间与布格重力异常及磁力异常的综合解释等结果,利用调和系数法对该研究区的地壳厚度进行了计算,并对地壳属性进行分析. 同时,选择中国东部东北地区的宽甸、华北地区的汉诺坝、华南的闵溪和台湾海峡的澎湖列岛与冲绳海槽和日本岛弧的新生代玄武岩开展元素—同位素对比研究. 结果认为冲绳海槽岩石层明显减薄,上地幔低速层已达到莫霍面,在地幔中已形成交代软流层. 元素—同位素研究表明:它不同于中国东部,与琉球岛弧地区的特点也不相同. 综合分析认为:冲绳海槽地壳属于过渡型地壳,与大洋地壳的许多特点颇为相似. 相似文献
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利用卫星重力资料反演地壳及岩石圈厚度 总被引:9,自引:0,他引:9
地球外部重力场由地球内部物质分布所决定,由于地宙与地幔、岩石圈与软流圈存在着较大的特性差异,利用重力资料可以确定莫霍面和岩石圈底面深度,基于上述结论,利用OSU91全球重力位模型数据进行了反演,计算结果表明,地壳和岩石圈厚度与地形相关,大陆地壳,岩石圈较厚,海洋则相反。 相似文献
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本文通过对东海973 航次在冲绳海槽取得的多道地震数据进行有针对性的特殊处理,形成一套针对天然气水合物地震学研究行之有效的处理思路,提高速度分析的精度和分辨能力,压制浅层多次波,资料在保持一定信噪比的基础上尽可能的提高分辨率,相对振幅处理以及用于AVO分析的预处理等.在此基础上对天然气水合物进行识别和预测,我们发现在冲绳海槽南部西侧槽坡附近以及海槽内部发育有一系列泥底辟构造,在这些底辟构造的顶部明显存在与天然气水合物赋存相关的地球物理特征,如似海底反射层(BSR)、与海底反射同相轴极性相反,BSR上方的振幅空白区以及BSR上下的速度异常.从该区域的地质背景资料分析,冲绳海槽不仅具有很高的沉积速率并且海槽西侧的断层活跃,提供了富含有机质的物源以及用于天然气运移的通道,有利于天然气水合物的形成. 相似文献
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中国东海及邻近海域一条剖面的地壳速度结构研究 总被引:11,自引:3,他引:11
1982年以来,中国科学院海洋研究所在东海海域进行了二十多个站位的遥测浮标折射地震测量,1991年又在东海陆架区进行了OBS测量,本文在我国东海域选择了横穿东海陆架,冲绳海槽,琉球岛弧,琉球海沟和菲律宾海盆的一条剖面,利用上述折射地震资料及其它该剖面附近的折射地震资料,对该剖面的地壳速度结构进行了研究,并进行了速度年代对比。研究表明,剖面的速度结构在纵向上和横向上都表现出明显的差异,横向上可分为三隆三盆,纵向上大致可划分为1.8-2.2km/s,2.4-2.8km/s,3.0-3.6km/s,4.2-5.1km/s和5.75-6.0km/s的速度层,从地壳的速度结构否则 本海区至少有如下的沉积旋回:降冲 槽的中抽外,上新世纪至第四纪本海区沉积环境稳定,而冲第槽中轴可能一直处于构造活跃的状态;始新世为本区沉积的全盛渐新世该区域处于抬升的时期,钓鱼岛隆起区、琉球岛弧隆起区在此期的沉积被剥蚀殆,东海陆架和冲 槽此时斯 沉积也受到相当程度的剥蚀,东海陆架盆地和冲绳槽此时期的沉积也受到相当沉的剥蚀。,东海陆架盆地和冲槽盆地的出现可能在5.75-6.0km/s的速度层沉积之后,菲律宾海盆为典型的大洋地壳结构。 相似文献
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尝试了直接利用布格重力数据和地形数据反演计算中国及邻区的地壳厚度的方法. 为减小区域不均衡性和重力反演中的不唯一性的影响,本方法利用地表地形起伏修正传统反演方法中的参考深度,并经过多次的迭代使得反演结果逼近真实值. 在此基础上,绘制了中国及邻区1deg;times;1deg;网格的地壳厚度图,对中国及邻区的布格重力异常和莫霍界面的起伏数据进行了相关性分析, 其相关性系数为-0.993. 其地形起伏与莫霍界面的起伏之间也呈现出了海、陆不同的线性相关,其相关系数分别为0.96和0.91. 相关性计算结果显示,重力数据揭示的大陆和海洋的交界大致为水下800 m. 为了探讨地球曲率对该算法可能的影响, 还分别计算了分区反演以及整体区域反演两种模式,研究发现两者得到的地壳厚度偏差在5km以内,并分析了可能产生偏差的原因. 比较本文结果与地震测深及其它研究结果表明,独立使用布格重力异常和地形数据,能较为可靠地反演出中国及邻区地壳厚度. 相似文献
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Oya Ankaya Pamukçu Zafer Akçığ Şevket Demirbaş Ekrem Zor 《Pure and Applied Geophysics》2007,164(11):2345-2358
The tectonic regime of Eastern Anatolia is determined by the Arabia-Eurasia continent-continent collision. Several dynamic
models have been proposed to characterize the collision zone and its geodynamic structure. In this study, change in crustal
thickness has been investigated using gravity, magnetic and topographic data of the region. In the first stage, two-dimensional
low-pass filter and upward analytical continuation techniques were applied to the Bouguer gravity data of the region to investigate
the behavior of the regional gravity anomalies. Next the moving window power spectrum method was used, and changes in the
probable structural depths from 38 to 52 km were determined. The changes in crustal thickness where free air gravity and magnetic
data have inversely correlated and the type of the anomaly resources were investigated applying the Euler deconvolution method
to Bouguer gravity data. The obtained depth values are consistent with the results obtained using the power spectrum method.
It was determined that the types of anomaly resources are different in the west and east of the 40° E longitude. Finally,
using the obtained findings from this study and seismic velocity models proposed for this region by previous studies, a probable
two-dimensional crust model was constituted. 相似文献
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(黄培华)(苏维加)(陈金波)SeismicityandstressfieldinOkinawaTroughandRyukyuregions¥Pei-HuaHUANG;Wei-jiaSUandJin-BoCHEN(DepartmentofEartha... 相似文献
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本文使用沿川滇块体东边界主要断裂带(安宁河、则木河、小江断裂带)布设的37个临时台站和四川区域台网14个固定台站记录的远震波形资料,用时间域迭代反褶积方法提取接收函数,采用接收函数H-κ反演方法得到了30个台站下方的地壳厚度和泊松比。研究结果表明,川滇块体东边界的地壳厚度表现为自西向东由60km左右向华南块体(35km左右)逐渐减薄的过渡带特征:以安宁河—大凉山断裂带为界,以西地壳厚度平均在54km左右,以东作为华南块体与川滇块体的交界前缘,地壳厚度在42~48km之间。以小江断裂带与则木河断裂带交汇处为界,其南北两侧的地壳岩性和组分差异明显。小江断裂带北段泊松比值在0.20~0.27之间,表明其地壳物质组分主要为中基性岩石。而以北的安宁河、则木河及马边—盐津断裂带的泊松比值大多位于0.27~0.32之间。安宁河—则木河断裂带附近多数台站的泊松比值0.30,可能是部分熔融造成的。 相似文献
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LI Tiegang XIANG Rong SUN Rongtao & CAO Qiyuan . Institute of Oceanology Chinese Academy of Sciences Qingdao China . College of Geosciences Ocean University of China Qingdao China Correspondence should be addressed to Li Tiegang 《中国科学D辑(英文版)》2005,48(6):805-814
Changes of the deep-water circulation and chemicalcompositions in related water masses in the oceanshave played a significant role in the evolution of theglobal climate system[1].Many studies have shownthat the characteristics of the deep-water during theglaciations were distinctly different from that of to-day[2,3].In the northern Pacific,Duplessy et al.[4]foundthat the ventilation of the deep-water(at water depthbetween700―2600m)during the last glaciation wasstronger than that of today,and … 相似文献
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Sr, Nd isotope geochemistry of volcanic rock series and its geological significance in the middle Okinawa Trough 总被引:3,自引:0,他引:3
There exists extensive basic-acidic volcanic rock series in the middle section of the Okinawa Trough. Different types of these
volcanic rocks have their own average strontium ratios of 0.704 749, 0.705 062, 0.708 771, 0.704 840 and 0.720 301 with average143Nd/144Nd ratios of 0.512 820, 0.512 673, 0.512 413, 0.512 729 and 0.512 034. These ratios of Sr and Nd isotopes all fall on a theoretic
hyperbolic curve of mixing between two end-members of MORB and rhyolitic magma. So we infer that these different kinds of
volcanic rocks in the middle Okinawa Trough are the erupted product in different stages of formation and evolution of the
trough crust. MORB magma, which had suffered assimilation, mixed with the early-formed crust-derived rhyolitic partial melt
mass at different ratios; then, these mixed magma erupted and formed volcanic rock types of the trough. This study indicates
that the Okinawa Trough is coming into a stage of submarine spreading from the stage of continental rift. 相似文献
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The relative abundance ofFlorisphueru profunda, a calcareous nannofossil species in lower euphotic zone, affords an opportunity to study variations in upper ocean structure
such as thickness of mixed layer. As revealed by the nannofossil analysis in sediments since 20 ka B. P. from three Okinawa
Trough cores, the percentage ofF. profunda increased significantly from glacial to Holocene, with a declining event ca 4 ka B. P. in its southern part. Its downcore
trend is similar to that ofPulleniatina obliquiloculuta, a tropical planktonic foraminifera1 species which lives in subsurface water below thermocline in the modern ocean. Their
similar variations imply an eastward shift of the Kuroshio Current, a reduction in thickness of the mixed layer, a shallowing
of thermocline and a possible increase of turbidity in the upper ocean during the glaciation. The eastward shift of the Kuroshio
might be repeated again about 4 ka B.P.
Project supported by the National Natural Science Foundation of China (Grant Nos. 49776289 and 49406067) 相似文献