2 items with the tag “nitrogen isotopes

  • Project 2: Origin and Evolution of Organic Matter in the Solar System
    NAI 2013 Carnegie Institution of Washington Annual Report

    We conduct observational analytical research on the volatile and organic rich Solar System Bodies by focusing on astronomical surveying of outer solar system objects and performing in-house analyses of meteorite, interplanetary dust particle, and Comet Wild 2/81P samples with an emphasis on characterizing the distribution, state and chemical history of primitive organic matter. We continue to study the mechanism of formation of refractory organic solids in primitive bodies and determine the origin of isotopic anomalies in organic solids in primitive solar system materials.

    ROADMAP OBJECTIVES: 2.2 3.1 7.1
  • Paleontological, Sedimentological, and Geochemical Investigations of the Mesoproterozoic-Neoproterozoic Transition
    NAI 2014 Massachusetts Institute of Technology Annual Report

    As we learn more about the earliest evolutionary history of animals and other complex multicellular organisms, it becomes clearer that a satisfactory understanding of these events have to be set within the broader context of late Mesoproterozoic and early Neoproterozoic biological and environmental change. To this end, several labs within our team have focused research effort of Mesoproterozoic and Neoproterozoic sedimentary successions. Over the reporting period, this has included stratigraphic and sedimentological fieldwork on rocks of this age in northwestern Canada, Death Valley, Mongolia, and anaylsis of drill cores from Russia, Congo and Zambia. Progress has also been made in new techniques for the discovery and description of Proterozoic microfossils, the processes forming ooids and wrinkle structures, severalfold improvements in the precision of oxygen-17 measurements, which can record the balance of atmospheric oxygen and carbon dioxide, and in measurements of nitrogen isotopes in ancient pigments, a potential redox tracer for the Proterozoic.

    ROADMAP OBJECTIVES: 4.1 4.2