Metamorphic fluid flow in the northeastern part of the 3.8–3.7Ga Isua Greenstone Belt (SW Greenland): A re-evalution of fluid inclusion evidence for early Archean seafloor-hydrothermal systems

Heijlen, Wouter; Appel, Peter; Frezzotti, Maria Luce; Horsewell, A.; Touret, Jacques

doi:10.1016/j.gca.2006.04.005

Cited by 13 publications

(8 citation statements)

References 80 publications

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“…Fluid-deposited graphite also generally has a high degree of crystallinity, due to its direct precipitation from a fluid rather than through a transformation from sedimentary carbonaceous material, and only a few examples with minor degree of disorder have been reported from auriferous quartz veins and from laboratory experiments (Luque et al, 1998(Luque et al, , 2009. Detailed petrographic analyses of fluid inclusions in metasomatically-altered Eoarchean meta-basalts from Isua have shown that microscopic graphite-carbonate mineral associations formed from H 2 O-CO 2 -(CH 4 )-NaCl fluids early in the history of the rock (Heijlen et al, 2006). It has recently been shown that fluid-deposited graphite can form at temperatures as low as 500°C so that high temperatures are not necessarily required for this process (Luque et al, 2009).…”

Section: Non-biological Pathways Of Carbon To Form Graphitementioning

confidence: 99%

Ancient graphite in the Eoarchean quartz–pyroxene rocks from Akilia in southern West Greenland I: Petrographic and spectroscopic characterization

Papineau

Gregorio

Cody

et al. 2010

Geochimica et Cosmochimica Acta

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Section: Non-biological Pathways Of Carbon To Form Graphitementioning

confidence: 99%

Ancient graphite in the Eoarchean quartz–pyroxene rocks from Akilia in southern West Greenland I: Petrographic and spectroscopic characterization

Papineau

Gregorio

Cody

et al. 2010

Geochimica et Cosmochimica Acta

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“…A change from CO 2 ‐ to CH 4 ‐dominated inclusions can occur during retrograde metamorphism (e.g. the Isua Greenstone Belt, SW Greenland; Heijlen et al. 2006), reflecting more reducing conditions after peak‐metamorphic conditions (approximately 460°C and 4 kbar).…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…A change from CO 2 -to CH 4dominated inclusions can occur during retrograde metamorphism (e.g. the Isua Greenstone Belt, SW Greenland; Heijlen et al 2006), reflecting more reducing conditions after peak-metamorphic conditions (approximately 460°C and 4 kbar). The composition of fluid inclusions is indicative of interaction between rock and fluid during low-grade metamorphism, suggesting a close relationship between regional metamorphism and formation of the veins (cf.…”

Section: Evolution Of Fluids and P-t Conditionsmentioning

confidence: 99%

Inferring intermediate‐scale fluid flow in a heterogeneous metasedimentary multilayer sequence during progressive deformation: evidence from the Monts d’Arrée slate belt (Brittany, France)

et al. 2008

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Quartz veins in the early Variscan Monts d'Arré e slate belt (Central Armorican Terrane, Western France), have been used to determine fluid-flow characteristics. A combination of a detailed structural analysis, fluid inclusion microthermometry and stable isotope analyses provides insights in the scale of fluid flow and the water-rock interactions. This research suggests that fluids were expelled during progressive deformation and underwent an evolution in fluid chemistry because of changing redox conditions. Seven quartz-vein generations were identified in the metasedimentary multilayer sequence of the Upper Silurian to Lower Devonian Plougastel Formation, and placed within the time frame of the deformation history. Fluid inclusion data of primary inclusions in syn-to post-tectonic vein generations indicate a gradual increase in methane content of the aqueous-gaseous H 2 O-CO 2 -NaCl-CH 4 -N 2 fluid during similar P-T conditions (350-400°C and 2-3.5 kbar). The heterogeneous centimetre-to metre-scale multilayer sequence of quartzites and phyllites has a range of oxygen-isotope values (8.0-14.1& Vienna Standard Mean Ocean Water), which is comparable with the range in the crosscutting quartz veins (10.5-14.7& V-SMOW). Significant differences between oxygen-isotope values of veins and adjacent host rock (D = )2.8& to +4.9& V-SMOW) suggest an absence of host-rock buffering on a centimetre scale, but based on the similar range of isotope values in the Plougastel Formation, an intraformational buffering and an intermediate-scale fluid-flow system could be inferred. The abundance of veins, their well-distributed and isolated occurrence, and their direct relationship with the progressive deformation suggests that the intermediate-scale fluid-flow system primarily occurred in a dynamically generated network of temporarily open fractures.

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“…55 The borate concentration in today's seawater is only 4.45 ppm, 56 but the finding of tourmaline in 3.8-billion-year-old rocks 57 and boron minerals in carbonaceous chondrites 58 speaks in favour of moderate borate concentrations in the waters of early Earth. Their abundance has to date increased following evolution of geological environments.…”

Section: Prebiotic Synthesis By Homogeneous Catalysismentioning

confidence: 99%

Catalysis in the Primordial World

Raos

Bermanec²

2017

Kem. Ind.

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Catalysis provides orderly prebiotic synthesis and eventually its evolution into autocatalytic (self-reproduction) systems. Research on homogeneous catalysis is concerned mostly with random peptide synthesis and the chances to produce catalytic peptide oligomers. Synthesis of ribose via formose reaction was found to be catalysed by B(OH) 4 − , presumably released by weathering of borate minerals. Oxide and clay mineral surfaces provide catalytic sites for the synthesis of oligopeptides and oligonucleotides. Chemoautotrophic or iron-sulphur-world theory assumes that the first (pioneer) organisms developed by catalytic processes on (Fe/Ni)S particles formed near/close hydrothermal vents. The review provides an overlay of possible catalytic reactions in prebiotic environment, discussing their selectivity (regioselectivity, stereoselectivity) as well as geological availability of catalytic minerals and geochemical conditions enabling catalytic reactions on early Earth.

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Metamorphic fluid flow in the northeastern part of the 3.8–3.7Ga Isua Greenstone Belt (SW Greenland): A re-evalution of fluid inclusion evidence for early Archean seafloor-hydrothermal systems

Cited by 13 publications

References 80 publications

Ancient graphite in the Eoarchean quartz–pyroxene rocks from Akilia in southern West Greenland I: Petrographic and spectroscopic characterization

Ancient graphite in the Eoarchean quartz–pyroxene rocks from Akilia in southern West Greenland I: Petrographic and spectroscopic characterization

Inferring intermediate‐scale fluid flow in a heterogeneous metasedimentary multilayer sequence during progressive deformation: evidence from the Monts d’Arrée slate belt (Brittany, France)

Catalysis in the Primordial World

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