越南石油生产和出口形势变化及其对中国的影响   总被引：3，自引：0，他引：3  

张抗 《世界地理研究》2009,18(2):98-103,45

越南石油产量快速上升,在2006年达到峰值后而迅速下降。为改变油品几乎全靠进口的状况,着手大力兴建炼厂。因而石油进出口形势将发生逆转。预计2013年后就可成为原油净进口国（进口量可达3—5千万吨）且将大量出口油品。此前越南是中国的原油进口源国和油品（特别是轻质油）的出口目的地。越南石油形势的重大变化将对中国和东亚石油格局产生一定的影响。  相似文献   

东南亚断裂构造的演化     

高庭朝  阮友宣  黎文勇  范南雄  Mai Xuan Bach  Thai Anh Tuan 《大地测量与地球动力学》2005,25(1):51-60

本研究项目是采用诸如地质学解释、影像判读和地球物理探测等多种方法相结合进行的。在所得结果的基础上参考了越南国内外同行的一些资料编制了东南亚、越南及邻区的断裂构造图．其比例尺分别为1：4百万和1：1百万。分析所得结果显示出东南亚断裂构造演化的下列情况：1)在现今地质结构方面东南亚是欧亚岩石圈板块的东南部分．由一条消减带围绕．这条消减带的伸展从Myanmer开始,通过Nicobar,Java Timor直到东菲律宾。东南亚被Song Hong(即红河)断裂,Three Pagodas断裂和Hainam-Natuna断裂等2级断裂系统分成3个微板块。2)在早新生代．东南亚是分为5个微板块的。它们的分界断裂中有2个一级断裂(中央东海扩张带和Lupar-Kuching消减带)和3个二级断裂(即上述3个)。3)上述绝大多数二和三级断裂从晚新生代起活化且继承了从早新生代即已发生和发展了的二、三级断裂,但在某些条件下．运动方向却完全变成了相反,尤其是走滑运动的方向。我们的研究结果表明：在这一地区内,盆地、隆起、岩浆侵入、褶皱和局部断裂等构造的形成都取决于这些沿着一、二级走滑断裂的微板块运动。  相似文献   

Geology,mineralogy, geochemistry and δ34S of sedimentary rock-hosted Au deposits in Song Hien structure,NE Vietnam     

《Ore Geology Reviews》2017

The Song Hien rift basin is considered to be one of the most important regions of gold mineralisation in North East Vietnam. A number of gold deposits in the Song Hien rift basin are hosted in Triassic and Devonian sedimentary formations of the basin. The largest among them are the Bo Va, Tham Riem and Khung Khoang deposits. The Bo Va deposit is hosted in carbonaceous sedimentary rocks of Triassic age, whereas the Tham Riem and Khung Khoang deposits are hosted in carbonaceous sedimentary rocks of Devonian ages. Based on the mineral composition of the ores, the deposits can be divided into to two types: (i) pyrite dominated and (ii) pyrite-arsenopyrite dominated. The Khung Khoang is of the first type and the Bo Va and Tham Riem deposits belong to the second type. The isotopic composition of pyrite and arsenopyrite in the Tham Riem deposit however, is close to that for the ores of the Bo Va deposit. The δ³⁴S value for pyrite ranging from −3.7‰ to −7.4‰ and for arsenopyrite ranging from −3.2‰ to 7.4‰. The δ³⁴S of pyrite in the ore from the Khung Khoang deposit however, has a much heavier isotopic composition of +18.9 to +20.2‰. A narrow range of the variation of sulfur isotopic composition of pyrite and arsenopyrite, the presence of visible gold as inclusions, the presence of chalcopyrite, sphalerite and other inclusions in arsenopyrite and pyrite, the large size of the grains of major ore minerals allow us to assume that the primary gold ores of the Bo Va and Tham Riem deposits underwent metamorphic transformations. The absence of arsenic, antimony, mercury and other characteristic elements in the ores of the Khung Khoang deposit, and substantially heavier isotopic composition of sulfur similar to the sulfur isotopic composition of marine sulfates in the Devonian, allow us to assume another source of the ore components, not connected with the Triassic sedimentary rocks of the Song Hien rift.  相似文献   

Ar-Ar ages of gold deposits in the Song Hien domain (NE Vietnam): Tectonic settings and comparison with Golden Triangle in China in terms of a single metallogenic province     

《Ore Geology Reviews》2017

The Song Hien rift basin is an important metallogenic area in NE Vietnam. This domain consists mainly of Triassic sulfide-rich black shale beds, which play a role as a sedimentary host for various mineral systems such as antimony, mercury and gold-sulfide deposits. Most of gold deposits are hosted in carbonaceous sedimentary rocks, however some deposits, which have similar characteristics, are hosted in fine-grained mafic magmatic rocks. An Ar-Ar isotopic dating of hydrothermal sericite from the sedimentary hosted Bo Va and Khung Khoang gold deposits and intrusion hosted orogenic Hat Han gold deposit yields plateau ages of 184.8 ± 2.1 Ma, 211.63 ± 2.3 Ma, and 209.12 ± 2.3 Ma, respectively. The obtained Ar-Ar ages convincingly show that the orogenic gold deposits in the Song Hien domain were formed in Late Triassic to Early Jurassic, while the age of the Bo Va deposit is at least older than 184.8 ± 2.1 Ma. Loss of argon by volume diffusion, supported by previously reported mineralogical and isotopic features of the Bo Va deposit may suggest that the Jurassic-Cretaceous (Yanshanian) tectonothermal events overprinted some deposits in the Song Hien domain. Formation of gold deposits in the Song Hien domain is linked to the same tectonic event as the Carlin-like gold deposits in SW China and is associated with an extensional tectonic regime that followed continental collision between the Indochina and South China Blocks. The similarity in geology setting and mineral composition of gold deposits of the Song Hien domain and the Golden Triangle region, as well as timing and kinematics of deformation, magmatic features, and stratigraphic sequence and bulk architecture, lead to conclusion that NE Vietnam and SW China is a single metallogenic zone. The study of gold deposits in Vietnam will provide a new data on the metallogenic history of this important part of SE Asia.  相似文献   

1992-2011年夏季南海西部离岸流区涡流相互作用特征   总被引：2，自引：1，他引：1  

李晗  王强  黄科  刘钦燕  TILAK Priyadarshan  管玉平  王东晓 《海洋与湖沼》2017,48(5):912-925

本文利用南海海洋再分析产品REDOS（Reanalysis Dataset of the South China Sea）和风场资料CCMP（Cross-Calibrated,Multi-Platform）,从能量学角度探讨了1992-2011年夏季（6-9月）越南离岸流区域涡-流相互作用特征,并通过能量收支方程诊断评估了风应力、压力梯度、正压不稳定以及平流的相对贡献。以越南离岸流的强度作为分类标准,对1992-2011年划分为正异常年、负异常年和正常年。结果表明,在正异常年,涡动能EKE（Eddy Kinetic Energy）和涡势能EPE（Eddy available Potential Energy）极大值主要分布在越南离岸流附近;在负异常年,EKE极大值向南北两侧分散,EPE极大值向北延伸;在正常年,EKE和EPE的极值空间分布介于正负异常之间。斜压不稳定是EPE年际变化的主要因素,越南离岸流影响周围海域的速度和密度分布,是斜压不稳定的主要原因。而影响EKE年际变化的因素较为复杂,压力做功是最主要的影响因素,风应力做功和平流做功次之,正压不稳定最小,其中正压不稳定依赖于流速大小和由风应力旋度扰动引起的上层水平流速剪切。  相似文献   

Sandwaves on the Southeast Vietnam Shelf recorded by high resolution seismic profiles: formation and mechanism   总被引：1，自引：0，他引：1  

Viet Dung Bui  Alex Schimanski  Karl Stattegger  Phach Van Phung  The Tiep Nguyen  Tien Hai Nguyen  Trung Thanh Nguyen  Truong Thanh Phi 《Frontiers of Earth Science》2009,3(1):9-20

The application of high resolution seismic data using boomer sound source has revealed a wide distribution of large-scale bedforms (sandwaves) on the Southeast Vietnam continental shelf. Bedforms that are a few meters high in wave height and hundreds of meters long in wavelength are primarily developed in the inner shelf (20–40 m) and considered to be formed under the present-day marine hydrodynamic conditions. Those bedforms developed in the deeper water (120 m) of the northernmost part of the continent can be interpreted as the relict morphological features formed during the latest sea-level lowstand of the late Pleistocene period. Two sediment transport paths have been identified on the basis of the bedform’s leeward orientation: northeast-southwest (along-shore) and north-south (cross-shore). A quantitative bottom current map is constructed from sandwave dimensions, surface sediments and measurement data. The strongest current velocities that gradually decrease toward the southwest are indicated by large sandwaves in the north (field B). Water depth, surficial sediment composition and bottom current are three factors that control the development of bedforms.  相似文献   

中国云南金平龙脖河铜矿与越南生权铜矿初步对比研究   总被引：1，自引：0，他引：1  

崔银亮  秦德先  陈耀光  毛云忠 《地质与勘探》2004,40(6):20-23

文章从成矿地质背景、矿化特征、地球物理特征、稀土元素特征、成矿物质来源等方面对中国云南金平龙脖河铜矿与越南生权铜矿进行了初步对比研究,认为它们具有诸多相似性,其成矿作用可以类比.因此,在金平龙脖河铜矿区具有寻找"生权"式大型铜矿的找矿前景,成果对区域找矿工作有战略指导意义.  相似文献   

Life cycle of intraseasonal oscillation of summer SST in the western South China Sea   总被引：1，自引：0，他引：1  

XIE Qiang  WU Xiangyu  YUAN Weny  WANG Dongxiao  XIE Shang-Ping 《海洋学报(英文版)》2007,26(3):1-8

Intraseasonal oscillation (ISO, times-cales of 30~90 d) of summer sea surface temperature (SST) in the western South China Sea is studied using harmonic and empirical orthogonal function analyses of microwave observations by the tropical rainfall measuring mission satellite. Each summer from May to September, two or three ISO events occur off South Vietnam, with a typical period of approximately 50 d. The life cycle of these events from the initiation to decay of SST anomalies is described.  相似文献   

Participation and influence of REDD+ actors in Vietnam, 2011–2019     

《Global Environmental Change》2021

Reducing emissions from deforestation and degradation (REDD+) is an important component of the Paris Agreement. Inclusive decision making is essential to ensure REDD outcomes, but there is limited anecdotal and empirical evidence demonstrating that stakeholder participation in REDD+ decision making has improved over time. This paper presents an analysis of the Vietnamese government’s claim that stakeholder participation in REDD+ had been improved over the course of 2011–2019, specifically focusing on various actors’ perceptions of their level of interest, engagement and influence in REDD+ policy events. Findings show that the country’s legal framework on REDD+ demonstrated Vietnam’s political commitment to improve inclusive decision making, and initial effort was made to provide political space for actors to engage in REDD+ decision making. However, momentum has been lost over time. This suggests that understanding the political context, addressing underlying power dynamics in the existing government regime, building up coalitions for change among political elites and civil society, and fostering sustainable political will and commitment are all essential to ensuring inclusive REDD+ decision making in Vietnam.  相似文献   

Lumped surface and sub‐surface runoff for erosion modeling within a small hilly watershed in northern Vietnam          下载免费PDF全文

Yen Tan Bui  D. Orange  S. M. Visser  Chu Thai Hoanh  M. Laissus  A. Poortinga  Duc Toan Tran  L. Stroosnijder 《水文研究》2014,28(6):2961-2974

Developing models to predict on‐site soil erosion and off‐site sediment transport at the agricultural watershed scale represent an on‐going challenge in research today. This study attempts to simulate the daily discharge and sediment loss using a distributed model that combines surface and sub‐surface runoffs in a small hilly watershed (< 1 km²). The semi‐quantitative model, Predict and Localize Erosion and Runoff (PLER), integrates the Manning–Strickler equation to simulate runoff and the Griffith University Erosion System Template equation to simulate soil detachment, sediment storage and soil loss based on a map resolution of 30 m × 30 m and over a daily time interval. By using a basic input data set and only two calibration coefficients based, respectively, on water velocity and soil detachment, the PLER model is easily applicable to different agricultural scenarios. The results indicate appropriate model performance and a high correlation between measured and predicted data with both Nash–Sutcliffe efficiency (Ef) and correlation coefficient (r²) having values > 0.9. With the simple input data needs, PLER model is a useful tool for daily runoff and soil erosion modeling in small hilly watersheds in humid tropical areas. Copyright © 2013 John Wiley & Sons, Ltd.  相似文献