Zobrazeno 1 - 10
of 45
pro vyhledávání: '"John S. Myers"'
Publikováno v:
Geological Society of America Abstracts with Programs.
Publikováno v:
Contributions to Mineralogy and Petrology. 165:1-24
Isotopic analyses of ancient mantle-derived magmatic rocks are used to trace the geochemical evolution of the Earth’s mantle, but it is often difficult to determine their primary, initial isotope ratios due to the detrimental effects of metamorphis
Publikováno v:
Journal of the Geological Society. 166:335-348
Field relations, structure and geochronology demonstrate that controversial rocks on Akilia, SW Greenland, cannot host evidence of Earth9s oldest life. Mafic–ultramafic gneiss that contains a layer of quartz–amphibole–pyroxene gneiss, a few met
Publikováno v:
The Journal of Geology. 113:239-263
Geochronological, geochemical, and morphological analysis of detrital zircon in the Jack Hills and Mount Narryer metasedimentary belts, Western Australia, indicates the grains were derived from diverse rocks, including >4000 Ma sources that predate t
Publikováno v:
Precambrian Research. 126:309-312
Spherical objects, identified as microfossils and named Isuasphaera isua (Pflug), were reported in 1978 from a chert in the 3.7–3.8 Ga Isua Greenstone Belt (IGB). Soon afterwards the biological nature of these objects was questioned on a number of
Publikováno v:
Geological Society of America Bulletin. 114:1311-1325
One of the oldest well-preserved sequences of tectonic events on Earth is recorded in intrusive rocks that lie north of the Isua greenstone belt, southern West Greenland. Detailed mapping and U-Pb dating of zircon and titanite build upon previous wor
Autor:
John S Myers
Publikováno v:
Precambrian Research. 117:151-156
Publikováno v:
Sedimentary Geology. :61-77
New structural and stratigraphic mapping in the Isua greenstone belt, West Greenland has revealed that the exposed lithologic succession is quite different to that depicted in earlier studies. The key to a better understanding of the stratigraphy has
Autor:
John S. Myers
Publikováno v:
Precambrian Research. 105:129-141
The Isua greenstone belt ( Fig. 1 ) contains the oldest known, relatively well preserved, metavolcanic and metasedimentary rocks on Earth. The rocks are all deformed and many were substantially altered by metasomatism, but both the deformation and me
Autor:
John S. Myers, James L. Crowley
Publikováno v:
Precambrian Research. 103:101-124
The Godthabsfjord region of West Greenland contains the most extensive, best exposed and most intensely studied early Archean rocks on Earth. A geological record has been described of numerous magmatic events between ∼3.9 and 3.6 Ga, and evidence o