搜索结果: 1-15 共查到“地质学 Mn”相关记录25条 . 查询时间(0.191 秒)
结晶生长过程在矿物学、地球化学、环境科学等多个学科领域中具有重要意义。普遍存在的异质表面能够显著影响晶体的形成和转变途径，对结晶生长过程具有关键作用，其作用机制长期受到关注。然而，该研究领域中仍有许多科学问题亟待解决：（1）某些异质基底自身的物化性质易发生变化（例如溶解），其对结晶生长过程的影响尚不清楚。（2）一些异相结晶生长过程伴随着电子转移，二者之间的相关性仍不明确。（3）对异质表面如何影响颗...
钴(Co)是关系国民经济、国家安全和高科技发展的重要战略金属资源，其在全球的分布极不均匀。钴资源与玄武质岩浆的成矿作用密切相关，玄武质岩浆的成分与地幔部分熔融过程和其形成的构造背景密切相关，因此，岩浆矿床中钴的资源量和成矿潜力应受控于其在不同构造背景下地幔部分熔融过程中的分配行为。
Apparent increase in Mn and As accumulation in the surface of sediments in Lake Biwa, Japan, from 1977 to 2009
ake Biwa manganese arsenic temporal variation environmental change
2017/4/11
An apparent temporal increase in Mn and As in a thin surface layer (ca. 2 cm) of sediments in Lake Biwa, Japan, was
observed by comparing depth profile data from 1977 and 2009. By our estimation, sev...
从成冰纪（“雪球地球”时期）到埃迪卡拉纪，地球的气候从极端严寒变得温暖，并且首次出现了多细胞后生动物。埃迪卡拉系底部的帽碳酸盐岩（~635 Ma）直接覆盖在成冰纪的冰成杂砾岩上，在全球具有广泛的分布，它们记录了这一时期环境和生命的快速变化。近二十年来，帽碳酸盐岩（Cap Carbonate）被越来越多地关注和研究。这些帽碳酸盐岩通常具有很高的Fe、Mn含量，表明它可能沉积于特殊的海洋环境中。
Mn- and Fe-carbonate rich layers in Meso-Cenozoic shales as proxies of environmental conditions: A case study from the southern Apennine, Italy
geochemistry manganese Northern-Calabrian Unit rhodochrosite southern Italy
2017/8/9
Mn-rich layers and interbedded shales from a well exposed natural section of the Northern-Calabrian Unit (Late Jurassic-Early Oligocene) in the surroundings of the Terranova del Pollino village, south...
Mn/Ca ratio in planktonic foraminifer from ODP Site 1144, the northern South China Sea: A possible paleoclimate indicator
planktonic foraminifer Mn/Ca ratios paleoclimate proxy South China Sea ODP
2017/8/9
We report here high-resolution Mn/Ca ratios of planktonic foraminifer, Globigerinoides sacculifer from ODP Site 1144 in the northern South China Sea (SCS). The variation pattern of the Mn/Ca ratios of...
Mn/Fe-Mn改性HZSM-5在NH3-SCR中的催化性能
离子交换 HZSM-5 选择性催化还原 一氧化氮
2012/3/16
采用离子交换法制备了不同Mn含量及不同Fe/Mn物质的量比的HZSM-5改性分子筛,并以NH3为还原剂,在体积空速为12000h-1条件下,考察了上述催化剂选择性催化还原NO性能.同时,运用环境扫描电镜(ESEM)、比表面积(BET)和X-射线衍射(XRD)等方法对催化剂进行了表征.结果表明,改性催化剂中活性组分在载体表面呈高度分散形式,催化活性较高,复合改性较单独改性性能更为优越,适量Fe的加入...
对太平洋海山Fe-Mn结壳最表层样品的稀有气体同位素丰度与组成测定发现, Fe-Mn结壳稀有气体存在如下特征: ① He, Ar同位素丰度与组成存在明显的分组现象, 分别命名为低3He/4He型和高3He/4He型; ②低3He/4He型样品4He丰度高(平均为191×10-9 cm3·STP·g-1), 4He, 20Ne和40Ar丰度变化范围大(分别为42.8×10-9~421×10-9, 5...
中国东部新生代玄武岩高Fe/Mn比值的成因意义
新生代玄武岩 OIB型特征 高Fe/Mn比值 岩石圈物质再循环
2009/1/23
中国东部新生代玄武岩普遍具有的高Fe/Mn比值(平均 = 68.6 ± 11.5)与OIB型微量元素特征暗示高Fe/Mn比值与OIB型特征之间具有耦合关系. 尽管单斜辉石分离结晶作用会引起玄武岩Fe/Mn比值增加, 但对华北克拉通北缘的汉诺坝和南缘安徽境内新生代玄武岩的详细研究, 发现这些玄武岩的高Fe/Mn比值无法单独用单斜辉石分离结晶作用解释, 而必须存在高Fe/Mn比值原始岩浆. 橄榄岩和辉...
固定小MN电测深与岩溶裂隙水探测
固定小MN 电测深 岩溶裂隙水 功效
2008/6/5
本文阐述了在一个测深点的测量中，MN始终固定不动，只加大供电电极距，使AB/3＞MN＞AB/100或更小的装置形式及其四极对称固定小MN装置特点，结合实例介绍了采用该装置电测深探测岩溶裂隙水的功效。
制备了负载在Na-Y分子筛上的Fe-Cu-Mn-Y复合催化剂, 并对其在非均相UV/Fe-Cu-Mn-Y/H2O2体系中催化氧化4BS染料废水进行了研究。 结果表明, 非均相UV/Fe-Cu-Mn-Y-H2O2体系对4BS染料废水的处理具有很高的效率。 在基准条件下, 反应时间为20min时, 废水中4BS的去除率达到了93.7%。 与均相UV/Fenton体系不同, 非均相UV/Fe-Cu-Mn...
Structural Chemistry of Fe, Mn, and Ni in Synthetic Hematites as Determined by Extended X-Ray Absorption Fine Structure Spectroscopy
EXAFS Fe Oxides Hematite Metal Substitution Trace Elements XAS XRD
2011/12/6
Abstract: The incorporation of transition metals into hematite may limit the aqueous concentration and bioavailabity of several important nutrients and toxic heavy metals. Before predicting how hemati...
Calculations of fluid-ternary solid solution equilibria: An application of the Wilson equation to fluid-(Fe,Mn,Mg)TiO3 equilibria at 600 °C and 1 kbar
Calculations fluid-ternary solid solution equilibria application Wilson equation fluid-(Fe,Mn,Mg)TiO3 equilibria 600 °C 1 kbar
2012/4/1
The Wilson equation (Wilson 1964) is applied to (Fe,Mn,Mg)TiO solid solutions for obtaining
the mixing properties of the ternary solid solution at 600 ?C and 1 kbar. The present study utilizes data
...
Fe,Mg,Mn-bearing phosphates in the GRA 95209 meteorite: Occurrences and mineral chemistry
Fe,Mg,Mn-bearing phosphates GRA95209 meteorite Occurrences mineral chemistry
2012/4/1
Two large regions of Fe,Mg,Mn-bearing phosphates, together with metal and various silicate phases,
have been observed in the GRA 95209 meteorite (a primitive achondrite belonging to the acapulcoite(R...
Spectroscopy Study of Arsenite [As(III)] Oxidation on Mn-Substituted Goethite
Arsenate Arsenite Mn-Substituted Goethite Oxidation XANES
2011/12/7
Abstract: Mn-substituted goethite was synthesized and the interaction between arsenite (As(III)) and Mn-substituted goethite was investigated by both solution chemistry and X-ray adsorption near edge ...