Terrestrial Carbon Sequestration in Devonian-Mississippian Anoxic Basins: Defining the Relative Importance of Higher Plants in Organic Accumulation in Marine Black Shales

泥盆系-密西西比系缺氧盆地的陆地碳固存：确定高等植物在海洋黑色页岩有机积累中的相对重要性（RIMMER-0310072）S.M. Rimmer，T.J. Algeo，A.M. Carmo和H.D.阿巴拉契亚泥盆纪盆地（ADB）的黑色页岩提供了一个独特的机会，以评估可能（有时）是一个区域性广泛的缺氧盆地的水柱条件，生产力和沉积的影响机制。 虽然缺氧的底层水条件可能影响有机碳的积累，但越来越多的证据表明，其他因素对水柱内生物地球化学循环的程度和方式以及沉积模式也有重大影响。Algeo及其同事（1995年，2001年）提出，晚泥盆世-早密西西比时代是地球历史上的一个关键事件，在此期间，来自大陆的营养物质的增加可能引发了海洋环境的还原条件，从而有助于碳固存。 这一事件不仅导致了海洋环境中更高水平的生产力，而且还提供了一个有机物质的增强流量的盆地，即与高等植物的进化有关的难降解的陆地物质。 通过综合岩相学、地球化学和沉积学代用指标，PI将重建ADB内的晚泥盆世-早密西西比世条件。 拟议的研究将测试的假设，陆生高等植物的出现在改变模式的有机碳积累在空间上广泛的，缺氧的海洋环境中发挥了主导作用。 重要的，也许是独特的，PI希望做出的贡献是使用有机岩相学和有机地球化学记录这一陆地殖民的海洋记录，并证明陆地有机物质在ADB中的流入增加，特别是可能在野火期间形成的氧化物质，可能是地球历史上那个时期富含有机物沉积物积累的一个比以前认识到的更重要的因素。

EAR-0310072RimmerTerrestrial carbon sequestration in Devonian-Mississippian anoxic basins: Defining the relative importance of higher plants in organic accumulation in marine black shales (EAR-0310072)S.M. Rimmer, T.J. Algeo, A.M. Carmo, and H.D. RoweABSTRACT The black shales of the Appalachian Devonian Basin (ADB) provide a unique opportunity to assess mechanisms that influenced water-column conditions, productivity, and sedimentation in what may have been (at times) a regionally extensive anoxic basin. While anoxic bottom-water conditions may have influenced organic carbon accumulation, growing evidence suggests that other factors contributed significantly to the degree and style of biogeochemical cycling within the water column and to the patterns of sedimentation. Algeo and co-workers (1995, 2001) have proposed that Late Devonian-Early Mississippian time was a pivotal episode in Earth history, during which the enhanced influx of continentally derived nutrients may have triggered reducing conditions in the marine environment and, thereby, contributed to carbon sequestration. Not only did this event lead to higher levels of productivity within the marine environment, but it also provided an enhanced flux of organic matter to the basin, that of refractory terrestrial matter associated with the evolution of higher plants. By integrating petrographic, geochemical, and sedimentological proxies, PIs will reconstruct Late Devonian-Early Mississippian conditions within the ADB. The proposed research will test the hypothesis that the advent of terrestrial higher plants played a commanding role in altering the mode of organic carbon accumulation in a spatially extensive, anoxic marine setting. The significant, and perhaps unique, contribution PIs hope to make is to document a marine record of this terrestrial colonization using organic petrography and organic geochemistry, and demonstrate that an increased influx of terrestrial organic matter across the ADB, particularly oxidized material that may have formed during wildfires, may have been a more important factor in the accumulation of organic-rich sediments during that time in Earth history than previously realized.