赞比亚巴鲁巴铜矿床地质特征及成因初探          下载免费PDF全文

赵凯  姚华舟  王建雄  吴发富  李占炎  方科 《地质科技通报》2018,37(5):132-138

巴鲁巴铜矿床位于赞比亚铜带省卢安夏市罗恩－穆利亚希盆地北缘,赋存于晚元古加丹加超群下罗恩组的白云质片岩中。矿体的形态受复式向斜褶皱构造控制,呈飘带状。铜矿化主要以条带状、浸染 状、脉状及网脉状产出。地层岩性与矿物分带组合特征表明,巴鲁巴铜矿区的沉积环境由早到晚,可能经历了陆缘到滨浅海环境,同时成岩成矿环境经历了氧化到还原的变化过程。矿区地层的沉积特征和矿化密切相关,表明了两者之间存在成因关系,具典型层控矿床特 征。区域变质作用不仅改造了矿体的形态,同时也活化了早期沉积 － 成岩期所形成的部分成矿物质,形成脉状铜矿化。巴 鲁 巴 铜 矿 床 为 沉 积 － 改 造 型 层 控 铜矿床。   相似文献   

Influence of salinity on the early development and biochemical dynamics of a marine fish,Inimicus japonicus     

龚续  黄旭雄  温文 《中国海洋湖沼学报》2018,36(2):427-437

Fertilised eggs of the devil stringer(I nimicus japonicus) were incubated at different salinity levels(21, 25, 29, 33, and 37), and then the hatching performances, morphological parameters, and biochemical composition(protein, lipid and carbohydrate) of the larvae were assayed to determine the influence of salinity on the early development of I. japonicus. The tested salinity levels did not af fect the times of hatching or mouth opening for yolk-sac larvae. However, the salinity significantly influenced the hatching and survival rates of open-mouthed larvae, as well as the morphology of yolk-sac larvae. The data indicated that 30.5 to 37.3 and 24.4 to 29.8 were suitable salinity ranges for the survival of embryos and larvae of I. japonicus, respectively. Larvae incubated at a salinity level of 29 had the greatest full lengths, and decreasing yolk volume was positively correlated with the environmental salinity. With increasing salinity, the individual dry weights of newly hatched larvae or open-mouthed larvae decreased significantly. Newly hatched larvae incubated at a salinity level of 29 had the greatest metabolic substrate contents and gross energy levels, while the openmouthed larvae's greatest values occurred at a salinity level of 25. Larvae incubated in the salinity range of 33 to 37 had the lowest nutritional reserves and energy values. Thus, the I. japonicus yolk-sac larvae acclimated more readily to the lower salinity level than the embryos, and higher salinity levels negatively influenced larval growth and development. In conclusion, the environmental salinity level should be maintained at 29–33 during embryogenesis and at 25–29 during early larval development for this species. Our results can be used to provide optimum aquaculture conditions for the early larval development of I. japonicus.  相似文献   

Influence of annealing conditions on impurity species in arsenic-doped HgCdTe grown by molecular beam epitaxy     

越方禹  陈璐  李亚巍  胡志高  孙琳  杨平雄  褚君浩 《海洋学报(英文版)》2010,29(11)

Based on our previous work, the influence of annealing conditions on impurity species in in-situ arsenic (As)-doped Hg_1-xCd_xTe (x≈ 0.3) grown by molecular beam epitaxy has been systematically investigated by modulated photoluminescence spectra. The results show that (i) the doped-As acting as undesirable shallow/deep levels in as-grown can be optimized under proper annealing conditions and the physical mechanism of the disadvantage of high activation temperature, commonly assumed to be more favourable for As activation, has been discussed as compared with the reports in the As-implanted HgCdTe epilayers (x≈ 0.39), (ii) the density of V_textrmHg has an evident effect on the determination of bandgap (or composition) of epilayers and the excessive introduction of V_Hg will lead to a short-wavelength shift of epilayers, and (iii) the V_textrmHg prefers forming the V_Hg-As_Hg complex when the inactivated-As (As_Hg or related) coexists in a certain density, which makes it difficult to annihilate V_Hg in As-doped epilayers. As a result, the bandedge electronic structures of epilayers under different conditions have been drawn as a brief guideline for preparing extrinsic p-type epilayers or related devices.  相似文献   

Shoreline Change Modeling on Emergency Beach Nourishment Project on West Beach of Beidaihe, China   总被引：3，自引：0，他引：3  

匡翠萍  潘毅  张宇  刘曙光  杨燕雄  张甲波 《中国海洋工程》2010,24(2):277-289

By use of a shoreline-change numerical model (GENESIS) based on one-line theory, a preliminary modeling study on shoreline changes caused by a beach nourishment project in Beidaihe, China, is presented in this paper. Firstly, the GENESIS model is verified and model sensitivity to the major parameter changes is discussed by simulating a hydraulic model test. The beach nourishment project, after that the shoreline change is kept being monitored, is a small-scale emergency one carried out to use two bathing places on the west beach in the summer, 2008. In this paper the shoreline changes caused by the beach nourishment project are modeled by the GENESIS model, and the computed results fit well with the measured shorelines. With the same model and parameters, a long-term performance of the project is predicted, and the result shows that the bathing places only can be suitable for bathing in 2 to 3 years without subsequence nourishment project. Therefore, it is proposed to nourish the beaches in time to keep the service life of the beach in recent years and carry out the beach nourishment project for the whole west beach as soon as possible.  相似文献   

环渤海砂质岸侵蚀和海滩养护   总被引：2，自引：0，他引：2  

庄振业  杨燕雄  刘会欣 《海洋地质前沿》2013,29(2):1-9

环渤海辽冀津鲁砂质岸近几十年遭受愈来愈强烈的侵蚀,岸线平均蚀退率约1.0～2.0m/a,局部或短期可达5～8m/a。为抑制海岸侵蚀,曾采取大量修建顺岸坝、丁坝等海岸"硬工程"护岸,但引起下游岸段继续侵蚀。近年逐渐发展起来的抛沙养滩工程可以增宽和稳定海滩,至2012年底,已完成和正在进行共有13处养滩工程,包括砂岸养滩、泥岸养滩和岩岸养滩等3种类型。在不同类型的海滩上养滩,应强调不同的设计重心。环渤海各养滩工程效果比较好,促进了滨海旅游业的发展,也取得了一些设计经验,预计未来将迎来环渤海海滩养护的新高潮。  相似文献   

云南思茅盆地大平掌铜金多金属矿床金的赋存状态          下载免费PDF全文

纪璇  刘书生  吴松洋  罗泽雄  张云龙  王冠  杨永飞  冷秋锋  王坤阳 《矿床地质》2023,42(1):170-191

大平掌矿床是西南三江地区重要的铜金多金属矿床，为系统地对比研究矿区16号勘探线新发现两类金矿体，即V₁块状硫化物矿体中顺层产出的层状金矿体、穿层断裂带中的网脉状金矿体中金的赋存状态、载金矿物类型，探讨金的沉淀机制。文章基于详实的野外地质调查，运用光学显微镜、扫描电镜(SEM)观察，结合电子探针(EPMA)分析和激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)原位微量元素分析。结果表明，两类金矿体矿石中可见金为金的独立矿物(银金矿、碲金矿、碲金银矿)，以裂隙金形式赋存，层状金矿体矿石中还可见晶隙金；热液型黄铁矿是两类金矿体矿石的主要载金矿物，其中“不可见金”均以固溶体金(Au⁺)为主，存在极少数的纳米金(Au⁰)。两类金矿体金的成矿均受后期东西向断裂带影响，为后期具有较高碲逸度的成矿热液充填成矿提供有利空间，金的独立矿物颗粒细小且分布不均，是由流体的沸腾和混合作用以及不平衡、不稳定的流体体系造成；两类金矿体中固溶体金(Au⁺)均由Au⁺占据黄铁矿晶格空位或缺陷等畸变形成。  相似文献   

柴达木盆地古近系下干柴沟组上段碎屑锆石U- Pb测年及盆山耦合探讨          下载免费PDF全文

曾旭  付锁堂  王波  龙国徽  吴志雄  崔海栋  王琛茜 《地质学报》2024,98(1):79-95

柴达木盆地被祁连山、阿尔金山及昆仑山所环绕，盆地古近系下干柴沟组(E23)地层独特的岩性和沉积格局指示了复杂盆山体系和源区多样成因。本文选取了盆地内部不同构造带5口钻井下干柴沟组的中粗砂岩样品，利用碎屑锆石U- Pb定年等分析方法对柴达木盆地进行了构造、物源系统分析。研究结果表明，位于祁连山前的XX- 1井样品下干柴沟组锆石年龄介于2692~156 Ma之间，主要峰值年龄为448 Ma和249 Ma，L6- 1井样品锆石年龄介于2693~220 Ma之间，主要峰值年龄为499 Ma和415 Ma；位于盆地西部沉降中心内部的YIT- 1井样品下干柴沟组锆石年龄介于2796~266 Ma之间，主要峰值年龄为423 Ma和255 Ma；阿尔金山前的N- 105井样品下干柴沟组锆石年龄介于2481~242 Ma之间，主要峰值年龄为422 Ma和259 Ma，N- 109井样品锆石年龄介于2638~228 Ma之间，主要峰值年龄为444 Ma和246 Ma。通过与主要源区年龄对比可知，盆地不同构造带下干柴沟组的物源差异较大，靠近祁连山前的XX- 1井、L6- 1井的物源主要来自于祁连山内部；位于阿尔金山前相邻的N- 105、N- 109井物源主体来自于阿尔金山内部，但N- 109井存在祁连山物源贡献；柴西坳陷内部YIT- 1井物源受祁连山及东昆仑共同控制。物源分析结果表明祁连山在古近纪已大规模隆升，并且作为青藏高原北部边界为柴达木盆地持续提供物源；阿尔金山及昆仑山在下干柴沟组沉积时期已经形成雏形，但并未大规模隆升，造成了山前带复杂的物源体系。  相似文献   

便携式近红外光谱矿物分析仪分光系统研制   总被引：6，自引：0，他引：6  

王智宏林君  武子玉朱虹　占细雄 《岩矿测试》2005,24(1):59-61

自行研制了光机电一体化的便携式近红外光谱仪的分光系统,采用单光路光栅扫描机构,以单片机控制微型步进电动机驱动,正弦传动实现分光系统的线性波长扫描.仪器波长范围1300～2500 nm,光谱分辨率7 nm,波长准确性和重现性均小于2 nm,全谱扫描时间小于70 s,重量小于5 kg,体积为260 mm×190 mm×130 mm.  相似文献