安徽铜陵冬瓜山大型铜矿：海底-喷流沉积与矽卡岩化叠加复合过程          下载免费PDF全文

侯增谦  侯增谦  杨竹森  吕庆田  曾普胜  谢玉玲  蒙义峰  田世洪  徐文艺  李红阳  姜章平  王训成  姚孝德 《地质学报》2011,85(5):659-686

冬瓜山铜矿是长江中下游成矿带铜陵矿集区内的一个大型铜矿.该矿床被惯称为矽卡岩型矿床,但具明显的层控特征.主矿体呈层状、似层状,赋存于上石炭统碳酸盐建造与下伏上泥盆统砂岩建造的接触带附近,主要由一系列层控块状含铜硫化物透镜体、含铜矽卡岩透镜体、磁铁矿矿囊以及层状含铜黄铁矿-蛇纹石矿席组成.主矿体的底部为根植于上泥盆统砂岩...  相似文献   

新疆巴什布拉克铀矿床成矿地球化学环境分析   总被引：2，自引：0，他引：2  

刘章月  邓华波  董文明  蔡根庆  刘红旭 《国外铀金地质》2011,(3):125-131

从地球化学角度,利用古气候条件和相关地球化学指标分析,指出研究区赋矿岩石形成于干旱的氧化环境;通过分析与铀矿化常见伴生元素组合结果,指出目的层曾遭受过不同程度还原性流体的改造,并在构造抬升期,地表氧化性流体顺层对目的层进行了再次改造,铀矿化则发生于两种不同性质流体混合改造部位。  相似文献   

蒙脱石与不同浓度KOH溶液作用反应产物的矿物学特征分析     

朱云  王浩然  杨晓雪  曹维政  鲁安怀  李艳  王清华  张虓雷  王长秋 《岩石矿物学杂志》2011,30(6):1053-1058

蒙脱石具有强烈亲水性,遇水体积可膨胀至原体积的数倍甚至数十倍,从而造成油气储层的水敏损害,但在强碱条件下蒙脱石可发生结构变化与物相转变,从而使其亲水性降低。本文具体探讨了天然钠基蒙脱石在80℃,0.1 M KOH、0.5 M KOH、1 M KOH溶液中所发生的碱溶反应;并通过XRD、SEM、EDAX等测试手段分析发现,碱溶相变的发生与碱溶液浓度及反应温度密切相关;碱溶相变最终产物主要是微米级纤维状、柱状、颗粒状的菱沸石和麦钾沸石,均为不具膨胀性的架状硅酸盐矿物;最后通过自由膨胀实验证实蒙脱石碱溶产物膨胀性较原矿物显著降低。  相似文献   

西南印度洋脊“断桥”热液区深部地质构造研究     

孙朝峰  吴招才  陶春辉  阮爱国  张国堙  郭志馗  黄恩贤 《海洋学报(英文版)》2018,37(3):73-79

Polymetalic sulfide is the main product of sea-floor hydrothermal venting, and has become an important sea-floor mineral resources for its rich in many kinds of precious metal elements. Since 2007, a number of investigations have been carried out by the China Ocean Mineral Resources Research and Development Association(COMRA)cruises(CCCs) along the Southwest Indian Ridge(SWIR). In 2011, the COMRA signed an exploration contract of sea-floor polymetallic sulfides of 10 000 km2 on the SWIR with the International Seabed Authority. Based on the multibeam data and shipborne gravity data obtained in 2010 by the R/V Dayang Yihao during the leg 6 of CCCs21, together with the global satellite surveys, the characteristics of gravity anomalies are analyzed in the Duanqiao hydrothermal field(37°39′S, 50°24′E). The "subarea calibration" terrain-correcting method is employed to calculate the Bouguer gravity anomaly, and the ocean bottom seismometer(OBS) profile is used to constrain the two-dimensional gravity anomaly simulation. The absent Moho in a previous seismic model is also calculated.The results show that the crustal thickness varies between 3 and 10 km along the profile, and the maximum crustal thickness reaches up to 10 km in the Duanqiao hydrothermal field with an average of 7.5 km. It is by far the most thicker crust discovered along the SWIR. The calculated crust thickness at the Longqi hydrothermal field is approximately 3 km, 1 km less than that indicated by seismic models, possibly due to the outcome of an oceanic core complex(OCC).  相似文献   

Financing REDD in developing countries: a supply and demand analysis     

《Climate Policy》2013,13(2):216-231

Reducing emissions from deforestation and forest degradation (REDD) in developing countries has been at the centre of negotiations on a renewed international climate regime. Developing countries have made it clear that their ability to engage in REDD activities would depend on obtaining sufficient and stable funding. Two alternative REDD financing options are examined to find possible ways forward: financing through a future compliance market and financing through a non-offset fund. First, global demand for hypothetical REDD credits is estimated. The demand for REDD credits would be highest with a base year of 1990, using gross—net accounting. The key factors determining demand in this scenario are the emission reduction targets and the allowable cap. A proportion of emission reduction targets available for offsets lower than 15% would fail to generate a sufficient demand for REDD. Also examined is the option of financing REDD through a fund. Indirectly linking the replenishment of a REDD fund to the market is a promising mechanism, but its feasibility depends on political will. The example of overseas development assistance for global health indicates the conditions for possible REDD financing. The best financial approach for REDD would be a flexible REDD mechanism with two tracks: a market track serving as a mitigation option for developed countries, and a fund track serving as a mitigation option for developing countries.  相似文献   

地质样品中硫化物形式铁的分离和测定   总被引：1，自引：0，他引：1  

周佳琦  胡超涌  马仲武  谢树成 《海洋地质与第四纪地质》2010,(2)

提出一个利用次氯酸钠氧化铁硫化物碱性磺基水杨酸提取并直接测定碳酸盐相中铁硫化物的方法。结果表明,30%的NaClO溶液浸泡样品40h以上,可以完全释放铁硫化物并形成氢氧化铁胶体。0.1g/mL的碱性磺基水杨酸溶液则较容易地溶解新生成的氢氧化铁胶体,形成黄色的铁-磺基水杨酸络合物,可被分光光度法定量测定。该方法集选择性分离、富集和测定于一体,分析流程简单,结果可靠,适合地质样品中硫化物形式铁的测定。  相似文献   

利用微区XRF技术的大洋固体矿产成分快速无损检测   总被引：1，自引：0，他引：1  

林梵宇  尹希杰  黄威  黄杰超  梁毓娜 《海洋地质与第四纪地质》2021,(1):223-232

深海固体矿产主要由铁锰结核、富钴结壳和多金属热液硫化物组成,元素在矿产中原位的分布和含量,对了解矿物成因、品位以及评估其经济价值有重要指示作用。本研究利用微区XRF分析技术对铁锰结核、富钴结壳、热液硫化物3种大洋类型矿产样品,进行高分辨、原位和无损的多元素空间分布检测,结果显示了不同元素在3种类型矿物中的空间分布特征。通过对测试数据进一步处理和优化成图流程,可以获得特定元素在矿物中半定量分布图,并对不同元素在矿物空间分布的差异性和相关性进行对比分析,从而建立一种肉眼可见的测试大洋矿产资源样品中元素原位分布的新方法。  相似文献   

地震灾害与经济可持发展刍议   总被引：1，自引：0，他引：1  

杨仕升 《国际地震动态》2005,(4):1-4

地震灾害是经济可持续发展的重要制约因素,经济可持续发展能有效减轻地震灾害。本文论述了地震灾害对经济可持续发展的影响,提出了正确处理地震灾害与经济可持续发展的关系、提高减灾效率和促进经济可持续发展的措施。  相似文献   

滑坡治理方法及工程实例分析   总被引：1，自引：0，他引：1  

韩西平 《地下水》2010,32(6):134-135

滑坡是地表的地质灾害之一,所造成的后果严重,损失惨重。人们已积累了大量的滑坡治理方法,简要介绍了目前较常用的滑坡治理方法,并结合工程实例进行分析以及滑坡治理方案的具体实施。  相似文献   

河南新安电厂冷却塔控制爆破拆除技术          下载免费PDF全文

徐华起  司育强  谷水兵 《探矿工程》2012,39(12):76-79

控制爆破技术在城市改造、楼房基础以及高大构筑物的拆除领域得到了广泛应用。介绍了采用控制爆破技术成功地爆破拆除河南省新安电厂80 m高冷却塔的工程实例。  相似文献