Geochemistry of Ammonium in Rocks

岩石中铵的地球化学

• 批准号: 8707319
• 负责人: Stephen Altaner
• 金额: $ 6.47万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-09-01 至 1990-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8707319&HistoricalAwards=false
• 关键词: Geochemistry; Ammonium; Rocks

Knowledge of the nitrogen cycle, which includes determination of reservoirs of nitrogen in the atmosphere, hydrosphere, and lithosphere, is hindered by limited data on nitrogen abundance in rocks. Recent investigations of coal-rich shale, illite/smectite clays, and hot spring deposits suggests that ammonium (NH4) bearing minerals may be much more abundant than previously recognized. This research will investigate the geochemistry of NH4 in coal-rich shale and glauconite-bearing strata. Specific goals include a better understanding of fluid/mineral reactions associated with coal-bearing, low grade metamorphic shales and with the environment of glauconite formation. To achieve these goals, it will be necessary to characterize the mineralogy and chemistry of these strata using various laboratory techniques (NH4 analysis, SEM, BSEM, TEM, XRD, XRF, and petrography) and to conduct hydrothermal experiments and geochemical calculations that measure equilibrium constants of NH4 fixation reactions. The results may show that NH4 - illite in coal-rich shale can be used as thermal indicator. Presence of NH4-illite should seriously affect measurements of the illite crystallinity index, long used to measure the thermal maturity of shales. Additional results may include possible explanations for low radiometric ages of glauconite and for differences in alkali contents between Fe-rich illite/smectite (glauconite) and Al- rich illite/smectite.

氮循环的知识，其中包括 确定大气中氮的储存库， 水圈和岩石圈的研究受到有限的数据的阻碍， 岩石中的氮丰度。 富煤区的最新研究 页岩、伊利石/蒙皂石粘土和温泉沉积物表明 含铵（NH 4）矿物质可能比 比以前认识到的。 这项研究将调查 富煤页岩和含钙钛矿中NH_4的地球化学 地层 具体目标包括更好地了解 流体/矿物反应与含煤、低品位 变质页岩，并与钙长石环境 阵 为了实现这些目标，有必要 使用以下方法描述这些地层的矿物学和化学特征 各种实验室技术（NH 4分析，SEM，BSEM，TEM，XRD， X射线荧光光谱和岩相学），并进行热液实验， 测量NH 4平衡常数的地球化学计算 固定反应 结果表明，NH_4-伊利石在 富煤页岩可作为热指示剂。 存在 NH_4-伊利石对伊利石的测定影响较大 结晶度指数，长期以来用于衡量 页岩 其他结果可能包括以下可能的解释： 低放射性年龄的钙钛矿和碱的差异 富铁伊/蒙石（蒙脱石）与Al- 富伊利石/蒙脱石。