Introduction: Understanding the distribution, chemistry, and structure of C in carbonaceous chondrites (CC) is fundamental to revealing information on early solar chemical evolution. The Tagish Lake CC has generated much interest partly because of its pristine nature and high C content [1,2,3]. Unique to the Tagish Lake CC are hollow carbonaceous nanoglobules [4]. These particles are morphologi...

Ureilites and carbonaceous chondrites: The origin of ureilite meteorites has been consistently regarded as problematic [1]. A distinctive feature of ureilites is that they contain carbonaceous matter up to 6 wt. %, particularly in the form of graphite in veinlets between silicate (mostly olivine) crystals, and along their cleavage planes. The carbonaceous matter within them suggests a relations...

The Mesoproterozoic deep ocean is thought to have been largely anoxic, dominated by ferruginous conditions. Phosphate was scavenged from the water column iron oxyhydroxides, and dissolved nitrate rapidly reduced along redoxcline. Primary productivity therefore generally low, eukaryotic life restricted oxic marine margins. This model supported new nitrogen isotope data Lower Riphean (ca. 1.55 Ga...

We report the first observation of indigenous carbonaceous matter in the martian meteorite Yamato 000593. The carbonaceous phases are heterogeneously distributed within secondary iddingsite alteration veins and present in a range of morphologies including areas composed of carbon-rich spheroidal assemblages encased in multiple layers of iddingsite. We also observed microtubular features emanati...

Introduction: UltraCarbonaceous Antarctic Micrometeorites (UCAMM) are a new type of fluffy, fragile particles, exceptionally rich in carbon. The samples were collected at Dome C near CONCORDIA station, in central Antarctica [1]. These particles are dominated by a very large amount of carbonaceous material, with concentrations up to ~ 50 wt%, even larger than that of anhydrous IDPs [2]. They are...

[1] The IMPACT global chemistry and transport model has been updated to include an aerosol dynamics module. Here it is used to simulate the dynamics of sulfate aerosol and its interaction with nonsulfate aerosol components: carbonaceous aerosol (organic matter (OM) and black carbon (BC)), dust, and sea salt. The sulfate aerosol dynamics is based on the method of modes and moments. In the curren...

We show that carbonaceous chondrite meteorites actively and selectively catalyze the formation of relevant prebiotic molecules from formamide in aqueous media. Specific catalytic behaviours are observed, depending on the origin and composition of the chondrites and on the type of water present in the system (activity: thermal > seawater > pure). We report the one-pot synthesis of all the natura...

The data reported in literature demonstrate that carbon paste electrodes (CPEs) are very suitable for a variety of applications and many works have thus been devoted in the development of new sensitive and selective electrode surfaces based on carbon paste as the electrode material of choice. The application of novel and promising carbonaceous materials, as electrode surfaces, is an issue of gr...