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  • 1
    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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  • 2
    Publication Date: 2009-06-26
    Description: Eoarchaean crust in West Greenland (the Itsaq Gneiss Complex, 3870-3600 Ma) is 〉80% by volume orthogneisses derived from plutonic tonalite-trondhjemite-granodiorite (TTG) suites, 〈10% amphibolites derived from basalts and gabbros, 〈10% crustally derived granite, 〈1% metasedimentary rocks and 〈〈1% tectonic slices of upper mantle peridotite. Amphibolites at 〉3850, c. 3810 and c. 3710 Ma have some compositional similarities to modern island arc basalts (IAB), suggesting their origin by hydrous fluxing of a suprasubduction-zone upper mantle wedge. Most of the Eoarchaean tonalites match in composition high-silica, low-magnesian adakites, whose petrogenesis is dominated by partial melting of garnetiferous mafic rocks at high pressure. However, associated with the tonalites are volumetrically minor more magnesian quartz diorites, whose genesis probably involved melting of depleted mantle to which some slab-derived component had been added. This assemblage is evocative of suites of magmas produced at Phanerozoic convergent plate boundaries in the case where subducted crust is young and hot. Thus, Eoarchaean subduction' first gave rise to short-lived episodes of mantle wedge melting by hydrous fluxing, yielding IAB-like basalts{+/-}boninites. In the hotter Eoarchaean Earth, flux-dominated destructive plate boundary magma generation quickly switched to slab melting of ( subducted') oceanic crust. This latter process produced the voluminous tonalites that were intruded into the slightly older sequences consisting of tectonically imbricated assemblages of IAB-like pillow lavas+sedimentary rocks, gabbros and upper mantle peridotite slivers. Zircon dating shows that Eoarchaean TTG production in the Itsaq Gneiss Complex was episodic (3870, 3850-3840, 3820-3810, 3795, 3760-3740, 3710-3695 and 3660 Ma). In each case, emplacement of small volumes of magma was probably followed by 10-40 Ma quiescence, which allowed the associated thermal pulse to dissipate. This explains why Greenland Eoarchaean crustal growth did not have granulite-facies metamorphism directly associated with it. Instead, 3660-3600 Ma granulite-facies metamorphism(s) in the Itsaq Gneiss Complex were consequential to collisional orogeny and underplating, upon termination of crustal growth. Similar Eoarchaean crustal history is recorded in the Anshan area of China, where a few well-preserved rocks as old as 3800 Ma have been found including high-MgO quartz diorites. For 3800 Ma rocks, this is a rare, if not unique, situation outside of the Itsaq Gneiss Complex. The presence of volumetrically minor 3800 Ma mantle-derived high-MgO quartz diorites in both the Itsaq Gneiss Complex and the Anshan area indicates either that Eoarchaean subduction' zones were overlain by a narrow mantle wedge or that the shallow subduction trapped slivers of upper mantle between the conserved and consumed plates.
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  • 3
    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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  • 4
    Publication Date: 2005-07-01
    Print ISSN: 0022-1376
    Electronic ISSN: 1537-5269
    Topics: Geosciences
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  • 5
    Publication Date: 2007-10-01
    Print ISSN: 0301-9268
    Electronic ISSN: 1872-7433
    Topics: Geosciences
    Published by Elsevier
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  • 6
    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
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  • 7
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    American Association for the Advancement of Science (AAAS)
    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
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  • 8
    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
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  • 9
    Publication Date: 2007-09-22
    Description: Parasitic nematodes that cause elephantiasis and river blindness threaten hundreds of millions of people in the developing world. We have sequenced the approximately 90 megabase (Mb) genome of the human filarial parasite Brugia malayi and predict approximately 11,500 protein coding genes in 71 Mb of robustly assembled sequence. Comparative analysis with the free-living, model nematode Caenorhabditis elegans revealed that, despite these genes having maintained little conservation of local synteny during approximately 350 million years of evolution, they largely remain in linkage on chromosomal units. More than 100 conserved operons were identified. Analysis of the predicted proteome provides evidence for adaptations of B. malayi to niches in its human and vector hosts and insights into the molecular basis of a mutualistic relationship with its Wolbachia endosymbiont. These findings offer a foundation for rational drug design.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2613796/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2613796/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ghedin, Elodie -- Wang, Shiliang -- Spiro, David -- Caler, Elisabet -- Zhao, Qi -- Crabtree, Jonathan -- Allen, Jonathan E -- Delcher, Arthur L -- Guiliano, David B -- Miranda-Saavedra, Diego -- Angiuoli, Samuel V -- Creasy, Todd -- Amedeo, Paolo -- Haas, Brian -- El-Sayed, Najib M -- Wortman, Jennifer R -- Feldblyum, Tamara -- Tallon, Luke -- Schatz, Michael -- Shumway, Martin -- Koo, Hean -- Salzberg, Steven L -- Schobel, Seth -- Pertea, Mihaela -- Pop, Mihai -- White, Owen -- Barton, Geoffrey J -- Carlow, Clotilde K S -- Crawford, Michael J -- Daub, Jennifer -- Dimmic, Matthew W -- Estes, Chris F -- Foster, Jeremy M -- Ganatra, Mehul -- Gregory, William F -- Johnson, Nicholas M -- Jin, Jinming -- Komuniecki, Richard -- Korf, Ian -- Kumar, Sanjay -- Laney, Sandra -- Li, Ben-Wen -- Li, Wen -- Lindblom, Tim H -- Lustigman, Sara -- Ma, Dong -- Maina, Claude V -- Martin, David M A -- McCarter, James P -- McReynolds, Larry -- Mitreva, Makedonka -- Nutman, Thomas B -- Parkinson, John -- Peregrin-Alvarez, Jose M -- Poole, Catherine -- Ren, Qinghu -- Saunders, Lori -- Sluder, Ann E -- Smith, Katherine -- Stanke, Mario -- Unnasch, Thomas R -- Ware, Jenna -- Wei, Aguan D -- Weil, Gary -- Williams, Deryck J -- Zhang, Yinhua -- Williams, Steven A -- Fraser-Liggett, Claire -- Slatko, Barton -- Blaxter, Mark L -- Scott, Alan L -- R01 AI048562/AI/NIAID NIH HHS/ -- R01 AI048562-09/AI/NIAID NIH HHS/ -- R01 LM006845/LM/NLM NIH HHS/ -- R01 LM006845-08/LM/NLM NIH HHS/ -- R01 LM007938/LM/NLM NIH HHS/ -- R01 LM007938-04/LM/NLM NIH HHS/ -- R15 ES013128/ES/NIEHS NIH HHS/ -- R15 ES013128-01/ES/NIEHS NIH HHS/ -- U01 AI048828/AI/NIAID NIH HHS/ -- U01-AI50903/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2007 Sep 21;317(5845):1756-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Infectious Diseases, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA. GhedinE@dom.pitt.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17885136" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brugia malayi/*genetics/physiology ; Caenorhabditis/genetics ; Drosophila melanogaster/genetics ; Drug Resistance/genetics ; Filariasis/parasitology ; *Genome, Helminth ; Humans ; Molecular Sequence Data
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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