海洋资源的化学——Ⅵ杀螟丹中间体硫氰化物的合成研究     

邢存章孙玉善  孙明昆 《山东海洋学院学报》1985,15(1):19-30

This paper deals with the synthesis of 1,3-dithiocyanato-2-dimethylaminopropane by the reaction of 2, 3-dichloro-1-dimethylaminopropane with sodium thiocyanate in H2O,in polar organic solvents CH3OH and 95% CH3CH2OH, and in the presence of several phase transfer catalysts including quaternary ammomium salts and amines. These methods have given a respective yield of 58.4% ,69.5% ,74.1% and 80%,  相似文献   

南海北部陆缘地壳结构探测结果分析   总被引：29，自引：4，他引：29  

阎贫  刘海龄 《热带海洋学报》2002,21(2):1-12

深部地震和重力资料反演揭示了南海北部陆缘地壳结构在总体上由北部的华南沿海（厚约30km）向南部的洋盆（5──8km）逐渐减薄。南海的近SN向拉张不仅造成南北方向地壳结构的巨大变化，也造成东西向的明显变化。在南海北部陆缘的西部，局部拉张产生了一系列裂谷构造。西沙海槽作为一条狭窄的陆内裂谷向西延伸，海槽南北两侧地壳厚度超过25km，海槽中部地壳减薄至不足10km。西端的莺歌海盆地地壳厚仅5km，缺少明显的壳内反射－折射。在珠江口盆地中部，地壳厚度在下陆坡明显减薄，地壳下部存在较薄的（3──4km）高速层（地震波速7．2──7．5km·s－1）；在珠江口盆地东部，地壳底部存在约 10km厚、300km宽的高速层。在台湾地区，由于弧陆碰撞，曾经减薄的陆壳在碰撞带增厚，莫霍面深度超过30km。南海北部陆缘在裂谷拉张和海底扩张期间岩浆活动平静，表明南海北部陆缘为非火山型陆缘。  相似文献   

我国东部及其海域的构造与板块构造的关系     

王桥先 《山东海洋学院学报》1985,(C00):193-193

我国东部及其海域，地处欧亚板块与太平洋板块接触带。太平洋板块向欧亚板块俯冲，因而影响和控制着上述地区构造的形成和发展。构成我国东部地区构造格架的北北东向隆起带和沉降带，是太平洋板块向西北俯冲的结果。中、新生代以来我国东部及其海域，岩浆活动具水平分带性及水平迁移性；在时间上具多旋回的特点。  相似文献   

马克斯威尔湾和阿得米拉达湾底部硫的早期化学成岩   总被引：1，自引：0，他引：1  

王成厚  程先豪 《海洋与湖沼》1990,21(5):465-473

根据南极半岛西部海区两个海湾的三个站位沉积物样品分析测定结果指出,SO_4~(2-)的还原作用及迁移转化具有明显地区特点并受环境控制。在M_1和R_2站海底,SO_4~(2-)被还原为硫化物。在M_6站表层沉积物中,硫化物被氧化为SO_4~(2-)。  相似文献   

古新世—更新世印度洋洋底岩浆作用,地质史和地球动力状况     

К.  ГЛ 《海洋地质译丛》1995,(3):68-78,F004

  相似文献   

贵阳地表水—地下水的硫和氯同位素组成特征及其污染物示踪意义   总被引：5，自引：0，他引：5  

郎赟超  刘丛强  Satake Hiroshi  WU Jiahong  李思亮 《地球科学进展》2008,23(2):151-159

喀斯特地表水和地下水的交换活跃,地下水系统容易受到地表污染物的污染。为了解喀斯特城市地表水—地下水系统污染特征和污染物质来源,对贵阳市地表水、地下水、雨水和城市排污污水的硫同位素和氯同位素组成变化进行了研究。贵阳市不同类型水体的δ³⁷Cl值在-4.07‰～+2.03‰之间变化,δ34SSO4值变化为-20.4‰～+20.9‰。大气输入物质和城市排污污水的δ³⁷Cl、δ³⁴S及Cl^-/SO₄^2-比值与地表水和地下水的不同,稳定硫和氯同位素的结合研究为示踪地下水污染物来源提供了有效研究手段。贵阳市地下水中的Cl^-和SO^₄2-至少有4种来源,人为活动通过城市排污和大气输入向地下水系统大量输入了硫酸盐和氯离子。   相似文献   

河南桐柏县破山银矿和银洞坡金矿的硫同位素研究   总被引：1，自引：0，他引：1  

李红梅  魏俊浩  黄祥芝 《现代地质》2008,22(1):18-23

河南桐柏县围山城金银成矿带的破山银矿和银洞坡金矿位于河前庄背斜的轴部和两翼,围岩为歪头山岩组,矿体受地层和构造的双重控制。两个矿床的矿石硫同位素δ34S值变化范围很窄,位于-1.8‰～5.3‰之间,具塔式效应,与围岩的硫同位素组成类似,具有深源硫的特征,由混合总体筛分可推测围岩提供了大部分硫源,破山银矿δ34S∑S为2.8‰左右。同时赋矿围岩的Au、Ag含量远远高于地壳丰度,因此可推断成矿物质主要来源于围岩歪头山岩组。  相似文献   

Mesoproterozoic Continental Arc Type Granite in the Central Tianshan Mountains: Zircon SHRIMP U-Pb Dating and Geochemical Analyses     

YANG Tiannan  LI Jinyi  SUN Guihu  WANG Yanbin 《《地质学报》英文版》2008,82(1):117-125

The Central Tianshan belt in northwestern China is a small Precambrian block located in the southern part of the Central Asia Orogenic Belt （CAOB）, which is considered as ＂the most voluminous block of young continental crust in the world＂ that comprises numerous small continental blocks separated by Paleozoic magmatic arcs. The Precambrian basement of the central Tianshan Mountains is composed of volcanic rocks and associated volcano-sedimentary rocks that were intruded by granitic plutons. Geochemical analyses demonstrate that the granitic plutons and volcanic rocks were generated in the Andean-type active continental arc environment like today＇s Chile, and the zircon U-Pb SHRIMP dating indicates that they were developed at about 956 Ma, possibly corresponding to the subduction of the inferred Mozambique Ocean under the Baltic-African super-continent.  相似文献   

Formation Dynamics and Quantitative Prediction of Hydrocarbons of the Superpressure System in the Dongying Sag   总被引：1，自引：0，他引：1  

SUI Fenggui  HAO Xuefeng  LIU Qing  ZHUO Qin’gong  ZHANG Shouchun 《《地质学报》英文版》2008,82(1):164-173

Based on the theory of formation dynamics of oil/gas pools, the Dongying sag can be divided into three dynamic systems regarding the accumulation of oil and gas： the superpressure closed system, the semi-closed system and the normal pressure open system. Based on the analysis of genesis of superpressure in the superpressure closed system and the rule of hydrocarbon expulsion, it is found that hydrocarbon generation is related to superpressure, which is the main driving factor of hydrocarbon migration. Micro fractures formed by superpressure are the main channels for hydrocarbon migration. There are three dynamic patterns for hydrocarbon expulsion： free water drainage, hydrocarbon accumulation and drainage through micro fissures. In the superpressure closed system, the oil-driving-water process and oil/gas accumulation were completed in lithologic traps by way of such two dynamic patterns as episodic evolution of superpressure systems and episodic pressure release of faults. The oil-bearing capacity of lithologic traps is intimately related to reservoir-forming dynamic force. Quantitative evaluation of dynamic conditions for pool formation can effectively predict the oil-bearing capability of traps.  相似文献   

Environmental Redox Changes of the Ancient Sea in the Yangtze Area during the Ordo-Silurian Transition     

YAN Detian  CHEN Daizhao  WANG Qingchen  WANG Jianguo  CHU Yang 《《地质学报》英文版》2008,82(3):679-689

Extensive organic-matter （OM） rich facies （black shales） occur in the Ordo-Silurian boundary successions in the Yangtze area, South China. To investigate the redox changes of the Yangtze Sea during the Ordo-Silurian transition, two OM sections （Wangjiawan in Yichang, Hubei Province, and Sanjiaguan in Zhangjiajie, Hunan Province） straddling the Ordo-Silurian boundary are studied. The measurements finished in this study include contents of the total organic carbon （TOC）, pyrite sulphur, and different species of Fe, including dithionite-extractable Fe （FED）, pyrite Fe （FeP）, HCl-extractable Fe （FeH）, and total Fe （FeT）, in black shales, as well as other redox proxies, such as the SIC ratio, the ratio between highly reactive Fe （FeHR = FeD ＋ FeP） and FeT, and the FeP/（FeP ＋ FeH） ratio, known as the degree of pyritization （DOP）. In the Wangjiawan section, the Middle Ashgill sediments have high FeHR/FeT ratios （0.20-0.77; avg. 0.45）, high DOP values （0.21-0.72; avg. 0.54）, and a relatively constant sulfur content independent of the organic carbon content. By the contrast, the mid-early Hirnantian deposits generally have low FeHR/FeT ratios （0.10-0.35; avg. 0.21）, low DOP values （0.11- 0.40; avg. 0.28）, and SIC values are clustering on the normal marine value （SIC = 0.36）. The late Hirnantian and early Rhuddanian deposits, similar to those of the Middle Ashgill deposits, are characterized by high FeHR/FeT ratios （0.32-0.49; avg. 0.41）, high DOP values （0.46-0.68; avg. 0.53） and fairly constant sulfur contents. These data suggest the occurrences of marine anoxia on the Yangtze Sea shelf during intervals of the Mid Ashgill, Late Hirnantian and Early Rhuddanian, and ventilated and oxygenated marine conditions during the mid-early Hirnantian time. The mid-early Hirnantian ventilated event was concomitant with the global glacial period, likely resulted from the glacio-eustatic sea-level fall and subsequent circulation of cold, dense oxygenated waters  相似文献