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Isua Greenstone Belt

The most compelling evidence for an ocean during the deposition of the Isua greenstone belt is... [Pg.3429]

Oldest preserved supracrustal rocks, Isua greenstone belt stratigraphy includes quartz-rich sedimentary rocks... [Pg.154]

The metamorphic history of the Isua Greenstone Belt, West Greenland... [Pg.329]

Abstract New geological investigations in the c. 3.7-3.8Ga Isua Greenstone Belt in West Greenland have revealed that the belt comprises a number of separate structural domains. [Pg.329]

A very early age was established for the Isua Greenstone Belt by Moorbath et al. (1973), who calculated a Pb-Pb whole-rock isochron age for the Isua iron formation of 3760 70Ma. Subsequent studies using Sm-Nd, Rb-Sr and Pb-Pb whole-rock isochrons, and conventional and single-zircon U-Pb ages all confirm an age >3.7 Ga (Moorbath et al. 1977, 1986,1997 Nut-man et al. 1997 Frei et al. 1999) and some parts of the greenstone belt may be as old as 3.9 Ga (Frei Rosing 2001). [Pg.329]

The rocks of the Isua Greenstone Belt have been considerably deformed and are now meta-... [Pg.329]

Second, it has been claimed that the rocks of the Isua Greenstone Belt preserve one of the earliest records of life on Earth. Carbon isotope... [Pg.329]

Fig. 1. Geological map of the Isua Greenstone Belt, showing the five structural domains identified in this study (I-V) and the location of the samples examined in this paper. Also shown are localities where kyanite has been recorded and the sites where biogenic graphic is reported (M, Mojzsis et al. 1996 R, Rosing 1999). The inset map shows the location of Isua in West Greenland. Fig. 1. Geological map of the Isua Greenstone Belt, showing the five structural domains identified in this study (I-V) and the location of the samples examined in this paper. Also shown are localities where kyanite has been recorded and the sites where biogenic graphic is reported (M, Mojzsis et al. 1996 R, Rosing 1999). The inset map shows the location of Isua in West Greenland.
Domain V is the most ancient part of the Isua Greenstone Belt and is located in the SW of the study area. Two samples have been investigated, from sites about 1 km apart. Sample... [Pg.341]

Fig. 8. A summary of garnet zoning profiles for the five structural domains of the Isua Greenstone Belt. The data are presented for fe-number, as an indicator of the thermal history of the grains, and show the generations of garnet in each domain, identified on the basis of their morphological, compositional and chemical-zonation differences. Fig. 8. A summary of garnet zoning profiles for the five structural domains of the Isua Greenstone Belt. The data are presented for fe-number, as an indicator of the thermal history of the grains, and show the generations of garnet in each domain, identified on the basis of their morphological, compositional and chemical-zonation differences.
On the basis of these correlations, the metamorphic history of the five domains of the Isua Greenstone Belt may be summarized as follows ... [Pg.346]

Appel, P. W. U., Fedo, C. M., Moorbath, S. Myers, J. S. 1998. Well-preserved volcanic and sedimentary features from a low-strain domain in the 3.7-3.8Ga Isua Greenstone Belt, West Greenland. Terra Nova, 10, 57-62. [Pg.349]

Myers, J. 2001. Protoliths of the ca. 3.7-3.8 Ga Isua Greenstone Belt, West Greenland. Precambrian Research, 105, 129-141. [Pg.350]

See other pages where Isua Greenstone Belt is mentioned: [Pg.3429]    [Pg.3466]    [Pg.3904]    [Pg.153]    [Pg.329]    [Pg.329]    [Pg.330]    [Pg.331]    [Pg.331]    [Pg.331]    [Pg.331]    [Pg.331]    [Pg.333]    [Pg.333]    [Pg.333]    [Pg.335]    [Pg.337]    [Pg.339]    [Pg.341]    [Pg.343]    [Pg.343]    [Pg.343]    [Pg.344]    [Pg.346]    [Pg.347]    [Pg.347]    [Pg.348]    [Pg.348]    [Pg.349]    [Pg.349]    [Pg.372]    [Pg.16]    [Pg.19]    [Pg.24]   


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Isua

Isua Greenstone Belt metamorphic history

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