Petrologic and Stable Isotopic Study of the Release, Transport, and Deposition of CO2 During Regional Metamorphism

区域变质作用过程中二氧化碳释放、传输和沉积的岩石学和稳定同位素研究

• 批准号: 9706638
• 负责人: Jay Ague
• 金额: $ 11.21万
• 依托单位: Yale University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1997
• 资助国家: 美国
• 起止时间: 1997-06-15 至 2001-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9706638&HistoricalAwards=false
• 关键词: Petrologic; Stable; Isotopic; Study; Release

9706638 Ague Tectonometamorphic processes during orogenic pulses can influence the CO2 budgets of the atmosphere and hydrosphere, and produce global climatic change. Processes include: (1) release of CO2 by metamorphic decarbonation and (2) sequestering of CO2 by rapid underthrusting and burial of carbonate-rich terranes. The PIs will investigate processes of decarbonation attending prograde infiltration of metamorphic and magmatic fluids and carbonate deposition in carbonate-bearing veins. Field area is the Orange-Milford belt in Connecticut. The nature, degree and length scales of mass transfer of H2O, CO2 and chemical elements and O, C, H and S isotopes will be determined by mapping chemical and isotopic fronts across lithologic contacts and evaluating net transfer and mass balance. PIs will investigate: (1) oxygen isotope zonations in in porphyroblasts, (2) porphyroblast growth reatlive to isotopic fron propagation, (3) isotpoic systemmatic of mineral in clusions in porphyroblasts, (4) cross-cutting relatios betweenn vien sets and prophyroblasts, (5) timing of mass transfer relative to folding and cleavage development, and (6) sedimentary/diagentic/low-grade effects in order to distinguish them from higher-grade phenomena. Geochemical modeling of fluid-rock interactions as a function of P, T and wallrock type will constrain the processes and efficiency of carbonation/decarbonation.

[9706638]造山脉冲期间的构造变质过程影响大气和水圈的CO2收支，导致全球气候变化。过程包括：(1)变质脱碳释放CO2和(2)快速逆冲和富碳酸盐地体埋藏封存CO2。pi将研究变质流体和岩浆流体的递进渗透以及碳酸盐沉积在含碳酸盐脉中的脱碳过程。油田区域是康涅狄格州的奥兰治-米尔福德带。通过绘制岩性接触面上的化学和同位素前沿，评估净传递和质量平衡，确定H2O、CO2和化学元素以及O、C、H和S同位素的传质性质、程度和长度尺度。PIs将研究：(1)卟啉母细胞中的氧同位素分带，(2)卟啉母细胞生长与繁殖的同位素相关，(3)卟啉母细胞中结缔组织中矿物的同位素系统，(4)vien sets和prophyroblast之间的横切关系，(5)相对于褶皱和解理发育的传质时间，(6)沉积/成岩/低品位效应，以区分它们与高品位现象。流体-岩石相互作用的地球化学模拟作为P、T和围岩类型的函数将约束碳酸化/脱碳的过程和效率。