海洋化学、海平面及气候对形成原生沉积锰矿床的影响

来源 :地质地球化学 | 被引量 : 0次 | 上传用户:new_java
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
许多显生宙沉积锰矿床的矿物学、地球化学,甚至某些情况下连其成因模型都已好研究得很透彻了,但是不断变化着的海洋化学、海平面及气候这样一些重要因素对形成锰矿床的影响却刚刚引起人们的重视。标的高度活动性(特别是在氧化-还原作用过程中)无疑使它在风化、搬运、沉积及成岩过程中会发生各种物相的变化。在化学风化过程中,锰溶解于酸性的还原介质中,并通过地表水和地下水被携带到滨岸地带,在弱还原(碳酸盐矿石)至氧化(氧化物矿石)条件下沉积形成了许多有开发价值的锰矿床。降雨能促进植物生长,进而控制着地下水的酸度。澳大利亚格鲁特岛和东欧及前苏联的古地中海边缘地区的许多锰矿床,都是在海侵过程中溶解锰向局限性黑色页岩盆地中大规模补给而形成的。这些矿床在成分上具有分带性,有证据表明,它们是在盆地内部集中了稀释的含矿溶液之后,在浅海相环境中形成的。当盆地转化为氧化环境时(特别是在海退的早期)锰就沉淀了下来。显生宙期间,海洋中溶解氧和碳的浓度是随着有机碳埋藏速率的剧变而强烈变化的。当埋藏快时,大气中CO2量减少,从而造成全球性的反温室效应—气候变冷。其后,随着海底有机质的被氧化,CO2被释放出来,最终又出现了温室效应—气候变暖。现在已经知道,海洋锰 Many of the Phanerozoic sedimentary manganese deposits have been well studied in mineralogy, geochemistry and, in some cases, even their causal models, but the changing nature of ocean chemistry, sea level and climate have led to the formation of The impact of manganese deposits has just attracted people’s attention. The high activity of the target (especially during oxidation-reduction) undoubtedly causes a variety of phases to change during weathering, handling, sedimentation and diagenesis. During chemical weathering, manganese dissolves in an acidic reducing medium and is transported to the shoreline by surface water and groundwater, forming many deposits from weakly reduced (carbonate ore) to oxidized (oxide ores) Development of manganese deposits. Rainfall can promote plant growth, which in turn controls the acidity of groundwater. Much of the manganese deposits on the margins of the ancient Mediterranean Sea in the islands of Grotte and Eastern Europe and the former Soviet Union of Australia are formed by the massive replenishment of dissolved manganese to localized black shale basins during transgression. These deposits are zonally componental and evidence suggests that they formed in shallow marine environments after the concentration of dilute ore-bearing solutions has been concentrated in the basin. Manganese precipitated when the basin was converted to an oxidizing environment (especially early in the recession). During the Phanerozoic, the concentrations of dissolved oxygen and carbon in the oceans vary strongly with the drastic changes in burial rates of organic carbon. When buried quickly, the amount of CO2 in the atmosphere is reduced, creating a global anti-greenhouse effect - climate chilling. Later, with the oxidation of the organic matter in the seafloor, CO2 was released, and finally the greenhouse effect - warming. It is now known that marine manganese
其他文献
荆大夫做客创业周扶持读者创业2007年9月1日在北京举办的《现代营销·创富信息版》首届读者节上,济南灵龟脊柱调理中心应邀参加,向读者节上的记者、读者和商家共有数千人免费
本文探究了小学英语学习的方法,鼓励孩子多接触英语,创设良好的家庭学习氛围;培养孩子的听说习惯;教学过程中采用联想记忆法:设法把单词的音、形、义联系起来;鼓励学生观看美
对中太平洋北部洋底锰结核进行了结构和粒度研究表明:除具有微米以上量级的结晶粒度的1埃和7埃水锰矿及δ-MnO_2等锰矿物外,存在着大量的结晶粒度属于纳米量级的多物相固体。
请下载后查看,本文暂不支持在线获取查看简介。电脑美术作品 Please download to view, this article does not support online access to view profile. Computer art wor
期刊
主要就第六届国际近海及极地工程会议论文中反映水动力学研究的最新动态作一综述。 This review summarizes the latest developments in hydrodynamics studies in the pap
基于冯士笮所给出的一种浅海环流模型,采用数值方法,对渤海冬季进行环流的数值模拟,给出了冬季三维风生环流和正压环流(含潮余流)。分析了潮致Lagrange余流对冬季环流的贡献及黄海暖流余脉
区域还是全国,同质化中抢份额,还是差异化中做垄断,这些问题都或多或少地困扰着省级卫视的定位和策略。一方面,全国性覆盖,全国性收视,必然要进行跨区域的全国性营销;另一方
我国海洋温度测量仪器已发展成多种品种,且具有较高的技术水平。如何把这种成熟技术推广到其它技术领域,是在当今市场经济条件下的一个新课题。本文将介绍海洋测温系统在建筑行
一、我国海洋开发的形势八届人大四次会议批准的《国民经济和社会发展“九五”计划和2010年远是目标纲要》确定了我国社会经济发展的目标,要求在“九五”期间实现人均国民生产
针对辽东湾顶的复杂地形,本文使用有限元方法离散浅水波动方程。对计算区域采用三角单元剖分,对水位和流速用线性插值函数逼近,应用动边界技术模拟了潮滩随水位变化而干出或