共查询到18条相似文献，搜索用时 93 毫秒
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柴达木盆地天青石资源极为丰富,已发现有大风山、碱山、尖顶山等大型天青石矿床。通过元素分析、元素相关性分析、矿物组合分析等方法与手段,对柴达木盆地天青石矿区矿物特点及元素地球化学特征进行了研究。得到如下结论:大风山矿区以天青石—方解石—镁方解石矿物组合为主,矿物品位均值为59%;碱山矿区以天青石—文石矿物组合为主,矿物品位均值为39.6%;石膏、白云石在各矿区矿物均有分布,且含量较低。石膏与天青石成正相关关系,白云石的存在对天青石成矿来说是不利因素,铁白云石、文石和镁方解石的普遍存在可说明该区矿物成矿温度较高。Sr与S成正相关关系,证明Sr主要以天青石(硫酸锶)形式存在,锶与镁、钙成非线性关系,锶含量高则钙含量低,钙主要赋存在石膏中,而非方解石中。Sr/Ba比值、Sr/Cu比值分析表明该矿区经历过长期干旱的环境,Mg/Ca比值分析表明该区天青石成矿过程中微生物对其成矿作用起到了非常重要的作用。 相似文献
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柴达木盆地天青石资源量极为丰富,已发现有大风山、碱山、尖顶山等大型天青石矿床。本文通过元素分析、元素相关性分析、矿物组合分析等方法与手段,对柴达木盆地天青石矿区矿物特点及元素地球化学特征进行了研究。得到结论如下：大风山矿区以天青石-方解石-镁方解石矿物组合为主,矿物品位均值为59%,碱山矿区以天青石-文石矿物组合为主,矿物品位均值为39.6%,石膏、白云石在各矿区矿物均有分布,且含量较低。石膏与天青石成正相关关系,白云石的存在对天青石成矿来说是不利因素,铁白云石、文石和镁方解石的普遍存在可说明该区矿物成矿温度较高。Sr与S成正相关关系,证明Sr主要以天青石（硫酸锶）形式存在,锶与镁、钙成非线性关系,锶含量高则钙含量低,钙主要赋存在石膏中,而非方解石中。Sr/Ba比值、Sr/Cu比值分析表明该矿区经历过长期干旱的环境,Mg /Ca比值分析表明该区天青石成矿过程中微生物对其成矿作用起到了非常重要的作用。 相似文献
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以活性较高的苛性白云石粉和氯化镁溶液制备白云石镁水泥材料。研究氧化镁、氯化镁和水不同配比条件下对白云石镁水泥材料的抗压强度、相组成以及形貌的影响。在所研究的配比条件下,以氧化镁、氯化镁和水摩尔比为3.38∶1.00∶16.86和3.24∶1.00∶16.26配比的镁水泥样块强度较高,结构致密,水化物胶凝相稳定;氯化镁加入量较低,水的加入量较高会使镁水泥试块强度不高;氯化镁加入量较高,水的加入量较低会使镁水泥试块吸潮返卤现象严重,导致强度逐渐下降。 相似文献
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民勤盆地地下水地球化学演化模拟 总被引：14，自引：4，他引：10
根据稳定同位素分析,民勤盆地地下水在第四系总体补给环境较现代凉。在200m以下的深层地下水为晚更新世补给的古封存水,表现为还原环境。60m—120m左右的浅层水为古地下水与现代降水的混合水,但古地下水占的成分较多,部分水样为氧化环境。民勤盆地地下水地球化学特征主要形成于山区,在沿途运移过程强烈的蒸发浓缩作用占据主导地位,形成了浅层高矿化盐碱水,深层地下水活跃的阳离子交换作用形成高钠浓度水。通过利用PHREEEQC法对民勤盆地地下水化学进行质量平衡模拟,表明民勤盆地地下水水化学沿水流路径以HCO3^-、SO4^2-、Cl^-、Ca^2 、Na^ 升高为主要特征,方解石、白云石的饱和指数随水流路径有减少趋势,而石膏、芒硝和岩盐的饱和指数有增加的趋势：沿水流途径白云石、CO2、石膏、岩盐和芒硝溶解量逐渐增加是常量离子浓度升高的物质来源。 相似文献
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经典测定钙、镁含量的方法是用EDTA标准溶液滴定钙镁总量后再滴定钙,此方法对于含钙、镁离子盐水体系溶解度的测定,尤其在镁含量较高的情况下,其分析精度和准确度远远迭不到要求。针对硝酸钙、硝酸镁混合样品,采用EDTA质量滴定法测定钙镁总量,用草酸钙沉淀法从镁中定量分离钙,然后运用羔减法计算出镁的含量。实验结果表明,当混合溶液中镁钙的质量比不超过10：1时,钙、镁离子分析结果的相对误差在±0．3％之内,但镁钙的质量比超过10：1时,相对误差达到1％。因此,在一定的镁钙质量比范围内,此方法可用于盐水体系中钙、镁含量的准确测定。 相似文献
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应用氯化镁—石灰乳法制备高纯氧化镁,降低氧化镁中钙含量是保证氧化镁产品质量的关键。通过对氧化镁的常温水化及二次煅烧,有效降低了氧化镁中钙含量,并通过正交试验得到了最优的水化工艺参数。氢氧化镁经850℃煅烧120 min,然后水洗,再次在1 050℃煅烧120 min,所得氧化镁纯度为99.1%99.4%,水化后钙含量(以CaO计)降低了约1%。 相似文献
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Shaw‐Wen Sheen 《The Professional geographer》2000,52(3):397-406
In this paper, I develop global karst chemical denudation models using chemical equilibrium equations. Theoretical karst chemical denudation rates are calculated as soil carbon dioxide concentration varies from 10?3.5 atm to 10?1.0 atm, temperature varies from 0°C to 30°C, and annual runoff varies from 500 mm to 3,000 mm. Both open and closed karst solution systems are examined. The Drake (1980) and the Brook‐Folkoff‐Box (1983) soil pCO2 equations are used to develop chemical denudation models for different carbonate rocks (limestone and dolomite), climate (tropical, temperate, and arctic/alpine terrains), and karst solution type (open and closed systems). The major conclusion is that the karst solution type, least known in the past karst studies, is an important factor in controlling chemical denudation rates. 相似文献
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《The Professional geographer》2013,65(3):397-406
In this paper, I develop global karst chemical denudation models using chemical equilibrium equations. Theoretical karst chemical denudation rates are calculated as soil carbon dioxide concentration varies from 10?3.5 atm to 10?1.0 atm, temperature varies from 0°C to 30°C, and annual runoff varies from 500 mm to 3,000 mm. Both open and closed karst solution systems are examined. The Drake (1980) and the Brook-Folkoff-Box (1983) soil pCO2 equations are used to develop chemical denudation models for different carbonate rocks (limestone and dolomite), climate (tropical, temperate, and arctic/alpine terrains), and karst solution type (open and closed systems). The major conclusion is that the karst solution type, least known in the past karst studies, is an important factor in controlling chemical denudation rates. 相似文献
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施秉喀斯特地貌世界遗产价值研究 总被引：2，自引：0，他引：2
对施秉喀斯特演化环境、地貌类型及分布、地貌演化史、石灰岩与白云岩地貌差异等特征进行研究,试图提炼施秉喀斯特的世界遗产地貌价值。研究表明：施秉喀斯特具有热带―亚热带地区独特的喀斯特地貌演化环境;展示了热带―亚热带地区独特而典型的白云岩峰丛峡谷喀斯特地貌景观,从分水岭至峡谷区呈现了峰林洼地―峰林谷地―峰丛谷地―峰丛峡谷喀斯特地貌逆向回春演替规律,是白云岩峡谷喀斯特地貌形态及地貌演化的模式地;记录了古生代以来3次较大的碰撞运动,即早古生代的加里东运动,晚古生代的海西造山运动,及中、新生代以来的印支运动、燕山运动和喜马拉雅山运动。燕山运动是本区最强烈的造山运动,产生了区内众多褶皱和断裂构造,奠定了施秉地区的地貌构造轮廓。喜马拉雅山运动,尤其是第二、三幕运动,全面塑造了施秉喀斯特峡谷地貌;施秉白云岩喀斯特地貌展现出与石灰岩封闭型地貌不同的以开放型地貌为主的特征,在中国南方喀斯特系列自然遗产中有重要地位,具备地貌世界遗产价值。 相似文献
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本文探讨了盐湖副产氯化镁应用于炼钢冶金造渣的可行性。以盐湖水氯镁石和石灰为原料,通过化学合成制备了氧化镁,再将氧化镁与石灰、粘结剂混配成型制备炼钢用镁钙造渣剂,考察了粘结剂硼酸的不同用量时造渣剂形成的球团强度和抗压强度及微观结构变化;同时研究了不同煅烧温度、煅烧时间、氧化镁掺杂量的情况下,造渣剂的活性及杂质脱除率。实验结果表明,利用该方法制备的镁钙造渣剂应用于钢铁冶金造渣过程,可有效地脱除碳、磷、硫、硅等杂质成分,提高转炉冶炼的冶金效果的同时实现了盐湖资源再利用,具有较好的推广应用前景。 相似文献
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Yoshiko Kawabata Tsuneo Tsukatani Yukio Katayama 《International Journal of Salt Lake Research》1999,8(2):99-112
Lake Balkhash is one of the many closed lakes in Central Asia. Mechanisms of demineralization in Lake Balkhash were considered from results of surveys undertaken on the lake and along the Ili River. Electrical conductivity (EC) values at the eastern coast in south-western Lake Balkhash were higher than those of the western coast. The Ili River enters at the south-western corner of the lake, so that EC values of this area are low. This water flows westwards. The distribution of Ca2+ concentrations showed that these were lower value in Lake Balkhash than along the Ili River, implying Ca2+ removal by the lake. Amongst suspended mineral matter in the lake occur calcite and dolomite. Thus, a possible mechanism of calcium removal is that it is removed as crystals of calcite or dolomite. SO
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concentration within the lake has increased for the past 37 years. This may be caused by the discharge into the lake from the city of Balkhash of waste water from a copper smelter. 相似文献
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INVESTIGATING MORPHOLOGICAL CHARACTERISTICS AND CHEMICAL COMPOSITION OF NAFTLIGE MUD VOLCANO IN GOLESTAN PROVINCE,EASTERN PART OF THE CASPIAN SEA 
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下载免费PDF全文 SAMAD FOTOOHI HOSSEIN NEGARESH 《Geografiska Annaler: Series A, Physical Geography》2016,98(3):207-219
Mud volcanoes are geomorphological phenomena and there is a limited volume of knowledge about them. Output of a composition of water, mud, and gas forms the mud volcano phenomenon. Geographical distribution of mud volcanoes indicates their relationship with pressured, rapid and thick sedimentation, which is seen in both tectonically active and inactive zones. Naftlige mud volcano is located in the southwest of the Caspian Sea and west of Gomishan Wetland in Golestan Province, Iran. Since no study has ever been conducted with a specific focus on mud volcanoes, field and laboratory studies were carried out for the first time to overcome the shortage of library resources. The objective was to determine the composition of emerging mud and study its morphometric and geomorphic features so that there would be a method for identifying and introducing some unknown aspects of this mud volcano. Therefore, three samples of this mud volcano which were taken on 27 Apr., 2012 were tested and analyzed using X‐ray diffraction and X‐ray fluorescence techniques to determine the mineral and chemical composition. The results of this analysis showed that, in these three samples, silicon oxide with the chemical formula SiO2 had 40.88% volatile materials, 19.15% H2O Loss on Ignition (LOI) and 13.97% calcium oxide. Quartz, calcite and albite formed the three main phases of minerals. 相似文献