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  • 1
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    Comment on "Zircon thermometer reveals minimum melting conditions on earliest Earth" II (2006)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2006-02-14
    Description: Watson and Harrison (Reports, 6 May 2005, p. 841) interpreted low temperatures (approximately 700 degrees C) for Hadean zircons as evidence of the existence of wet, minimum-melting conditions within 200 million years of solar system formation. However, high-temperature melts (approximately 900 degrees C) are zircon-undersaturated and crystallize zircon only after substantial temperature drop during fractional crystallization. Zircon thermometry cannot distinguish between low- and high-temperature Hadean igneous sources.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nutman, Allen P -- New York, N.Y. -- Science. 2006 Feb 10;311(5762):779; author reply 779.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research School of Earth Sciences, Australian National University, Canberra, ACT 0200, Australia. Allen.Nutman@anu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16469904" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Comment on "A vestige of Earth's oldest ophiolite" (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-11-03
    Description: Furnes et al. (Reports, 23 March 2007, p. 1704) reported the identification of an ophiolite sequence within the approximately 3.8-billion-year-old Isua supracrustal belt. However, they did not acknowledge that the belt contains supracrustal rocks and mafic dikes of different ages, nor did they demonstrate that the proposed components of the ophiolite are coeval.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nutman, Allen P -- Friend, Clark R L -- New York, N.Y. -- Science. 2007 Nov 2;318(5851):746.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China. nutman@bjshrimp.cn〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17975049" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Coupled 142Nd-143Nd isotopic evidence for Hadean mantle dynamics (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-12-22
    Description: The oldest rocks-3.85 billion years old-from southwest Greenland have coupled neodymium-142 excesses (from decay of now-extinct samarium-146; half-life, 103 million years) and neodymium-143 excesses (from decay of samarium-147; half-life, 106 billion years), relative to chondritic meteorites, that directly date the formation of chemically distinct silicate reservoirs in the first 30 million to 75 million years of Earth history. The differences in 142Nd signatures of coeval rocks from the two most extensive crustal relicts more than 3.6 billion years old, in Western Australia and southwest Greenland, reveal early-formed large-scale chemical heterogeneities in Earth's mantle that persisted for at least the first billion years of Earth history. Temporal variations in 142Nd signatures track the subsequent incomplete remixing of very-early-formed mantle chemical domains.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bennett, Vickie C -- Brandon, Alan D -- Nutman, Allen P -- New York, N.Y. -- Science. 2007 Dec 21;318(5858):1907-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research School of Earth Sciences, Australian National University, Canberra ACT, 0200 Australia. vickie.bennett@anu.edu.au〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18096803" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
    Electronic Resource
    Electronic Resource
    Evidence for life on Earth before 3,800 million years ago (1996)
    [s.l.] : Nature Publishing Group
    Nature 384 (1996), S. 55-59 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FIG. 1 a, Field exposure of the 3,850-yr-old Akilia island BIF3 (collected 150km south of Isua, 63° 55'40" N, 51° 41'30" W; photograph by A. Nutman) in southern West Greenland. Finely alter-nating bands of magnetite (dark) and silicates (light) are evident on the broken-off boulder which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/384055a0
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  • 5
    Electronic Resource
    Electronic Resource
    Late Archaean terrane accretion in the Godthåb region, southern West Greenland (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 535-538 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The field geology of the Nuuk region8,9 has been substantiated by much isotopic data10"15. This work distinguished a poly-genetic older complex dominated by the early Archaean Amitsoq gneisses, the Malene supracrustal rocks and a younger, polygenetic intrusive complex of quartzo-feldspathic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335535a0
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  • 6
    Electronic Resource
    Electronic Resource
    Constraints on early Earth differentiation from hafnium and neodymium isotopes (1996)
    [s.l.] : Nature Publishing Group
    Nature 379 (1996), S. 624-627 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The neodymium isotope record of juvenile, mantle-derived rocks is quite well documented12'13. In general terms, the record of the highest £Nd values4'13'14 can be described in three main segments (Fig. 1): (1) a nearly linear increase from about 2.5 Gyr ago to the present; (2) an essentially ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/379624a0
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  • 7
    Electronic Resource
    Electronic Resource
    Response of zircon U−Pb isotopes and whole-rock geochemistry to CO2 fluid-induced granulite-facies metamorphism, Kabbaldurga, Karnataka, South India (1992)
    Springer
    Contributions to mineralogy and petrology 111 (1992), S. 299-310 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The arrested, prograde amphibolite- to granulite-facies transition at Kabbaldurga, south India, overprints Archacan amphibolite-facies nebulitic gneisses and the late Archaean Closepet granite. Previous studies have shown that this facies transition was controlled by a channelled influx of a dehydrating fluid, assumed to be CO2, at ∼750°C and 5.5 kbar confining pressure. The effect of this type of prograde transition on zircon U−Pb isotopic systematics and whole-rock geochemistry has been studied using ∼1 kg amphibolite-facies, transitional and granulite-facies domains from a single block of gneiss. The zircon populations from all three domains have essentially similar morphology and U−Pb systematics. This similarity shows that at the conditions under which the prograde granulite-facies transition took place via fluid influx, the zircon U−Pb systematics were not disturbed by the process. Using the pooled data from all three domains, it is concluded that the protolith of the gneiss formed at 2965±4 Ma (2σ), and that zircons also grew during an anatectic event common to all domains at 2528±5 Ma. The granulite-facies metamorphism has not been dated directly due to the lack of response to the zircon U−Pb isotopic systematies to it. However, field and petrographic criteria dictate that its maximum age is 2528±5 Ma, the age of the anatectic event common to each domain in the gneiss block, which was overprinted during the granulite-facies event. For most major and trace elements, consistent enrichment or depletion trends associated with the transition to granulite facies cannot be identified with confidence. However, the granulite-facies portion is LREE (light-rare-earth-element)-enriched and H (heavy) REE-depleted compared with the amphibolite-facies domain, and the transitional domain is at intermediate values. The isotopic and geochemical evidence presented supports the conclusion that the granulite-facies charnockitic rocks at Kabbaldurga were not formed by removal of an anatectic melt, but that they formed later by simple metamorphic overprint of amphibolite-facies rocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00311193
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  • 8
    Electronic Resource
    Electronic Resource
    New evidence for life on earth by 3870 Ma (1996)
    Springer
    Origins of life and evolution of the biospheres 26 (1996), S. 297-298 
    Details
    ISSN: 1573-0875
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459768
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  • 9
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    Geochronology of Proterozoic basement inliers in the Colombian Andes: tectonic history of remnants of a fragmented Grenville belt (2007)
    In:  Geological Society Special Publication 246: 329-346.
    Details
    Publication Date: 2007-10-08
    Description: Basement inliers of high-grade metamorphic rocks within the eastern Colombian Andes record a Grenvillian history. Among them, the Garzon Complex and the Dibulla, Bucaramanga and Jojoncito gneisses were studied using different geochronological methods to produce better correlations in the context of the reconstruction of the Grenville belt and of the supercontinent of Rodinia. The dynamic evolution of all of these units includes a final collisional event with exhumation of high-grade rocks. Such a tectonic history bears strong similarities with the Grenville Province in Canada and seems to confirm that these domains took part in the aggregation of Rodinia. Mesoproterozoic U-Pb zircon ages indicate heritage from magmatic protoliths, and the Sm-Nd model ages, as well as the {varepsilon}Nd values, suggest derivation from an evolved continental domain, such as the Amazonian craton, with some mixing with juvenile Neoproterozoic material. When these continental fragments are correlated with similar terrains in Mexico and the Central Andes, a large crustal fragment is implied; very probably it made up the southern portion of the Grenville belt within Rodinia, which was disrupted when Laurentia separated from Gondwana forming the Iapetus Ocean, leaving behind cratonic fragments that were later accreted to the South American Platform.
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  • 10
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    West Gondwana amalgamation based on detrital zircon ages from Neoproterozoic Ribeira and Dom Feliciano belts of South America and comparison with coeval sequences from SW Africa (2008)
    In:  Geological Society Special Publication 294: 239-256.
    Details
    Publication Date: 2008-02-01
    Description: NeoproterozoicCambrian amalgamation of West Gondwana involved the collision of several terranes of older crust that are now in eastern South America and western Africa. UPb (SHRIMP) detrital zircon ages from representative metasedimentary units of the Ribeira and Dom Feliciano belts (South America) and Gariep and Damara belts (Africa) provide constraints on the possible sediment source areas across probable suture zones. Ribeira detrital zircons are Palaeoproterozoic and Archaean. For the Dom Feliciano Belt, a contribution of Meso- and Neoproterozoic zircons is present, which definitely indicate Neoproterozoic sedimentation. It is proposed that the inflow of material to the Ribeira basin was essentially derived from the Paranapanema and Rio de la Plata cratons, whereas for the Damara and GariepRocha belts source areas were from the Namaqua Belt. The Dom Feliciano Belt received sediments from the South American side and to a lesser degree from African sources. These results highlight the differences in the detrital zircon signatures across a proposed West Gondwanan suture, with those in the west being derived from distinctive South American basement sources and those in the east from distinctive African sources.
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