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  • 1
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    Where does India end and Eurasia begin? (2011)
    Wiley
    Details
    Publication Date: 2011-10-20
    Description: The Indus Suture Zone is defined as the plate boundary between India and Eurasia. Here we document geochronological data that suggest that Indian rocks outcrop to the north of this suture zone. The inherited age spectrum of zircons from mylonitic gneiss collected in the southern part of the Karakorum Batholith is similar to those obtained from the Himalayan Terrane, the Pamir and is apparently Gondwanan in its affinity. These data are taken to indicate that the Karakorum Terrane was once a component of Gondwana, or at least derived from the erosion of Gondwanan material. Several continental ribbons (including the Karakorum Terrane) were rifted from the northern margin of Gondwana and accreted to Eurasia prior to India-Eurasia collision. Many therefore consider the Karakorum Terrane is the southern margin of Eurasia. However, we do not know if rifting led to the creation of a new microplate(s) or simply attenuated crust between Gondwana and these continental ribbons. Thus there is a problem using inherited and detrital age data to distinguish what is “Indian” and what is “Eurasian” crust. These findings have implications for other detrital/inherited zircon studies where these data are used to draw inferences about the tectonic history of various terranes around the world.
    Electronic ISSN: 1525-2027
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Published by Wiley on behalf of American Geophysical Union (AGU).
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  • 2
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    Neutron activation analysis of a particle returned from asteroid Itokawa (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: A single grain (~3 micrograms) returned by the Hayabusa spacecraft was analyzed by neutron activation analysis. This grain is mainly composed of olivine with minor amounts of plagioclase, troilite, and metal. Our results establish that the Itokawa sample has similar chemical characteristics (iron/scandium and nickel/cobalt ratios) to chondrites, confirming that this grain is extraterrestrial in origin and has primitive chemical compositions. Estimated iridium/nickel and iridium/cobalt ratios for metal in the Itokawa samples are about five times lower than CI carbonaceous chondrite values. A similar depletion of iridium was observed in chondrule metals of ordinary chondrites. These metals must have condensed from the nebular where refractory siderophile elements already condensed and were segregated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ebihara, M -- Sekimoto, S -- Shirai, N -- Hamajima, Y -- Yamamoto, M -- Kumagai, K -- Oura, Y -- Ireland, T R -- Kitajima, F -- Nagao, K -- Nakamura, T -- Naraoka, H -- Noguchi, T -- Okazaki, R -- Tsuchiyama, A -- Uesugi, M -- Yurimoto, H -- Zolensky, M E -- Abe, M -- Fujimura, A -- Mukai, T -- Yada, Y -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1119-21. doi: 10.1126/science.1207865.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan. ebihara-mitsuru@tmu.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868669" 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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    Three-dimensional structure of Hayabusa samples: origin and evolution of Itokawa regolith (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: Regolith particles on the asteroid Itokawa were recovered by the Hayabusa mission. Their three-dimensional (3D) structure and other properties, revealed by x-ray microtomography, provide information on regolith formation. Modal abundances of minerals, bulk density (3.4 grams per cubic centimeter), and the 3D textures indicate that the particles represent a mixture of equilibrated and less-equilibrated LL chondrite materials. Evidence for melting was not seen on any of the particles. Some particles have rounded edges. Overall, the particles' size and shape are different from those seen in particles from the lunar regolith. These features suggest that meteoroid impacts on the asteroid surface primarily form much of the regolith particle, and that seismic-induced grain motion in the smooth terrain abrades them over time.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tsuchiyama, Akira -- Uesugi, Masayuki -- Matsushima, Takashi -- Michikami, Tatsuhiro -- Kadono, Toshihiko -- Nakamura, Tomoki -- Uesugi, Kentaro -- Nakano, Tsukasa -- Sandford, Scott A -- Noguchi, Ryo -- Matsumoto, Toru -- Matsuno, Junya -- Nagano, Takashi -- Imai, Yuta -- Takeuchi, Akihisa -- Suzuki, Yoshio -- Ogami, Toshihiro -- Katagiri, Jun -- Ebihara, Mitsuru -- Ireland, Trevor R -- Kitajima, Fumio -- Nagao, Keisuke -- Naraoka, Hiroshi -- Noguchi, Takaaki -- Okazaki, Ryuji -- Yurimoto, Hisayoshi -- Zolensky, Michael E -- Mukai, Toshifumi -- Abe, Masanao -- Yada, Toru -- Fujimura, Akio -- Yoshikawa, Makoto -- Kawaguchi, Junichiro -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1125-8. doi: 10.1126/science.1207807.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Earth and Space Science, Osaka University, Toyonaka, 560-0043, Japan. akira@ess.sci.osaka-u.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868671" 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
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    Oxygen isotopic compositions of asteroidal materials returned from Itokawa by the Hayabusa mission (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: Meteorite studies suggest that each solar system object has a unique oxygen isotopic composition. Chondrites, the most primitive of meteorites, have been believed to be derived from asteroids, but oxygen isotopic compositions of asteroids themselves have not been established. We measured, using secondary ion mass spectrometry, oxygen isotopic compositions of rock particles from asteroid 25143 Itokawa returned by the Hayabusa spacecraft. Compositions of the particles are depleted in (16)O relative to terrestrial materials and indicate that Itokawa, an S-type asteroid, is one of the sources of the LL or L group of equilibrated ordinary chondrites. This is a direct oxygen-isotope link between chondrites and their parent asteroid.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yurimoto, Hisayoshi -- Abe, Ken-ichi -- Abe, Masanao -- Ebihara, Mitsuru -- Fujimura, Akio -- Hashiguchi, Minako -- Hashizume, Ko -- Ireland, Trevor R -- Itoh, Shoichi -- Katayama, Juri -- Kato, Chizu -- Kawaguchi, Junichiro -- Kawasaki, Noriyuki -- Kitajima, Fumio -- Kobayashi, Sachio -- Meike, Tatsuji -- Mukai, Toshifumi -- Nagao, Keisuke -- Nakamura, Tomoki -- Naraoka, Hiroshi -- Noguchi, Takaaki -- Okazaki, Ryuji -- Park, Changkun -- Sakamoto, Naoya -- Seto, Yusuke -- Takei, Masashi -- Tsuchiyama, Akira -- Uesugi, Masayuki -- Wakaki, Shigeyuki -- Yada, Toru -- Yamamoto, Kosuke -- Yoshikawa, Makoto -- Zolensky, Michael E -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1116-9. doi: 10.1126/science.1207776.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan. yuri@ep.sci.hokudai.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868668" 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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  • 5
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    Irradiation history of Itokawa regolith material deduced from noble gases in the Hayabusa samples (2011)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2011-08-27
    Description: Noble gas isotopes were measured in three rocky grains from asteroid Itokawa to elucidate a history of irradiation from cosmic rays and solar wind on its surface. Large amounts of solar helium (He), neon (Ne), and argon (Ar) trapped in various depths in the grains were observed, which can be explained by multiple implantations of solar wind particles into the grains, combined with preferential He loss caused by frictional wear of space-weathered rims on the grains. Short residence time of less than 8 million years was implied for the grains by an estimate on cosmic-ray-produced (21)Ne. Our results suggest that Itokawa is continuously losing its surface materials into space at a rate of tens of centimeters per million years. The lifetime of Itokawa should be much shorter than the age of our solar system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nagao, Keisuke -- Okazaki, Ryuji -- Nakamura, Tomoki -- Miura, Yayoi N -- Osawa, Takahito -- Bajo, Ken-ichi -- Matsuda, Shintaro -- Ebihara, Mitsuru -- Ireland, Trevor R -- Kitajima, Fumio -- Naraoka, Hiroshi -- Noguchi, Takaaki -- Tsuchiyama, Akira -- Yurimoto, Hisayoshi -- Zolensky, Michael E -- Uesugi, Masayuki -- Shirai, Kei -- Abe, Masanao -- Yada, Toru -- Ishibashi, Yukihiro -- Fujimura, Akio -- Mukai, Toshifumi -- Ueno, Munetaka -- Okada, Tatsuaki -- Yoshikawa, Makoto -- Kawaguchi, Junichiro -- New York, N.Y. -- Science. 2011 Aug 26;333(6046):1128-31. doi: 10.1126/science.1207785.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Geochemical Research Center, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan. nagao@eqchem.s.u-tokyo.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21868672" 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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  • 6
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    Interferometric radii of bright Kepler stars with the CHARA Array: {theta} Cygni and 16 Cygni A and B (2013)
    Oxford University Press
    Details
    Publication Date: 2013-07-04
    Description: We present the results of long-baseline optical interferometry observations using the Precision Astronomical Visual Observations (PAVO) beam combiner at the Center for High Angular Resolution Astronomy (CHARA) Array to measure the angular sizes of three bright Kepler stars: Cygni, and both components of the binary system 16 Cygni. Supporting infrared observations were made with the Michigan Infrared Combiner (MIRC) and Classic beam combiner, also at the CHARA Array. We find limb-darkened angular diameters of 0.753 ± 0.009 mas for Cyg, 0.539 ± 0.007 mas for 16 Cyg A and 0.490 ± 0.006 mas for 16 Cyg B. The Kepler Mission has observed these stars with outstanding photometric precision, revealing the presence of solar-like oscillations. Due to the brightness of these stars the oscillations have exceptional signal-to-noise, allowing for detailed study through asteroseismology, and are well constrained by other observations. We have combined our interferometric diameters with Hipparcos parallaxes, spectrophotometric bolometric fluxes and the asteroseismic large frequency separation to measure linear radii ( Cyg: 1.48 ± 0.02 R , 16 Cyg A: 1.22 ± 0.02 R , 16 Cyg B: 1.12 ± 0.02 R ), effective temperatures ( Cyg: 6749 ± 44 K, 16 Cyg A: 5839 ± 42 K, 16 Cyg B: 5809 ± 39 K) and masses ( Cyg: 1.37 ± 0.04 M , 16 Cyg A: 1.07 ± 0.05 M , 16 Cyg B: 1.05 ± 0.04 M ) for each star with very little model dependence. The measurements presented here will provide strong constraints for future stellar modelling efforts.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 7
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    Zircon in amphibolites from Naxos, Aegean Sea, Greece: Origin, significance and tectonic setting (2016)
    Wiley
    Details
    Publication Date: 2016-11-23
    Description: We report U-Pb zircon ages of c . 700-550 Ma, 262-220 Ma, 47-38 Ma and 15-14 Ma from amphibolites on Naxos Island in the Aegean extensional province of Greece. The zircon has complex internal structures. Based on CL response, zoning and crosscutting relationships a minimum of four zircon growth stages are identified: inherited core, magmatic core, inner metamorphic (?) rim and an outer metamorphic rim. Trace element compositions of the amphibolites suggest igneous differentiation and crustal assimilation. Zircon solubility as a function of saturation temperatures, Zr content and melt composition indicates that the zircon did not originally crystallize in the mafic bodies but were inherited from felsic precursor rocks, and subsequently assimilated into the mafic intrusives during emplacement. Zircon inheritance is corroborated by the complex, xenocrystic nature of the zircon in one sample. Ages of c . 700-550 Ma and 262-220 Ma are assigned to inherited zircon. Available geochemical data suggest that the 15-14 Ma metamorphic rims grew in-situ in the amphibolites, corresponding to a high-grade metamorphic event at this time. However, the geochemical data cannot conclusively establish if the c . 40 Ma zircon rims also grew in-situ, or whether they were inherited along with the xenocrystic cores. Two scenarios for emplacement of the mafic intrusives are discussed: (1) Intrusion during late-Triassic to Jurassic ocean basin development of the Aegean realm, in which case the 40 Ma zircon rims would have grown in-situ, and (2) emplacement in the Miocene as a result mafic underplating during large-scale extension. In this case, only the 15-14 Ma metamorphic outer rims would have formed in-situ in the amphibolitic host rocks. This article is protected by copyright. All rights reserved.
    Print ISSN: 0263-4929
    Electronic ISSN: 1525-1314
    Topics: Geosciences
    Published by Wiley
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  • 8
    Electronic Resource
    Electronic Resource
    The regional significance of Cretaceous magmatism and metamorphism in Fiordland, New Zealand, from U–Pb zircon geochronology (2004)
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 22 (2004), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The western Fiordland Orthogneiss (WFO) is an extensive composite metagabbroic to dioritic arc batholith that was emplaced at c. 20–25 km crustal depth into Palaeozoic and Mesozoic gneiss during collision and accretion of the arc with the Mesozoic Pacific Gondwana margin. Sensitive high-resolution ion microprobe U–Pb zircon data from central and northern Fiordland indicate that WFO plutons were emplaced throughout the early Cretaceous (123.6 ± 3.0, 121.8 ± 1.7, 120.0 ± 2.6 and 115.6 ± 2.4 Ma). Emplacement of the WFO synchronous with regional deformation and collisional-style orogenesis is illustrated by (i) coeval ages of a post-D1 dyke (123.6 ± 3.0 Ma) and its host pluton (121.8 ± 1.7 Ma) at Mt Daniel and (ii) coeval ages of pluton emplacement and metamorphism/deformation of proximal paragneiss in George and Doubtful Sounds. The coincidence emplacement and metamorphic ages indicate that the WFO was regionally significant as a heat source for amphibolite to granulite facies metamorphism. The age spectra of detrital zircon populations were characterized for four paragneiss samples. A paragneiss from Doubtful Sound shows a similar age spectrum to other central Fiordland and Westland paragneiss and SE Australian Ordovician sedimentary rocks, with age peaks at 600–500 and 1100–900 Ma, a smaller peak at c. 1400 Ma, and a minor Archean component. Similarly, one sample of the George Sound paragneiss has a significant Palaeozoic to Archean age spectrum, however zircon populations from the George Sound paragneiss are dominated by Permo-Triassic components and thus are markedly different from any of those previously studied in Fiordland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1525-1314.2004.00537.x
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  • 9
    Electronic Resource
    Electronic Resource
    Geochronology and geochemistry of high-pressure granulites of the Arthur River Complex, Fiordland, New Zealand: Cretaceous magmatism and metamorphism on the palaeo-Pacific Margin (2003)
    Oxford, UK : Blackwell Science Inc
    Journal of metamorphic geology 21 (2003), S. 0 
    Details
    ISSN: 1525-1314
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The Arthur River Complex is a suite of gabbroic to dioritic orthogneisses in northern Fiordland, New Zealand. The Arthur River Complex separates rocks of the Median Tectonic Zone, a Mesozoic island arc complex, from Palaeozoic rocks of the palaeo-Pacific Gondwana margin, and is itself intruded by the Western Fiordland Orthogneiss. New SHRIMP U/Pb single zircon data are presented for magmatic, metamorphic and deformation events in the Arthur River Complex and adjacent rocks from northern Fiordland. The Arthur River Complex orthogneisses and dykes are dominated by magmatic zircon dated at 136–129 Ma. A dioritic orthogneiss that occurs along the eastern margin of the Complex is dated at 154.4 ± 3.6 Ma and predates adjacent plutons of the Median Tectonic Zone. Rims on zircon cores from this sample record a thermal event at c. 120 Ma, attributed to the emplacement of the Western Fiordland Orthogneiss. Migmatitic Palaeozoic orthogneiss from the Arthur River Complex (346 ± 6 Ma) is interpreted as deformed wall rock. Very fine rims (5–20 µm) also indicate a metamorphic age of c. 120–110 Ma. A post-tectonic pegmatite (81.8 ± 1.8 Ma) may be related to phases of crustal extension associated with the opening of the Tasman Sea. The Arthur River Complex is interpreted as a batholith, emplaced at mid-crustal levels and then buried to deep crustal levels due to convergence of the Median Tectonic Zone arc and the continental margin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1525-1314.2003.00443.x
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  • 10
    Electronic Resource
    Electronic Resource
    Unsupported radiogenic Pb in zircon: a cause of anomalously high Pb-Pb, U-Pb and Th-Pb ages (1984)
    Springer
    Contributions to mineralogy and petrology 88 (1984), S. 322-327 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Ion microprobe U-Th-Pb isotopic analyses of zircons from a granodioritic orthogneiss from the Napier Complex, Mount Sones, Enderby Land, Antarctica, have identified an unambiguous example of unsupported radiogenic Pb in a 3,950 Ma-old crystal. At one 40 μm spot on the crystal an unusually large heterogeneity in Pb content was found, the concentration of radiogenic Pb ranging from 5 to 50 percent higher than could have been generated in 3,950 Ma by radioactive decay of the co-existing U and Th. This relative excess of radiogenic Pb is attributed to Pb gain rather than to U and Th loss because first, the Pb content varied by more than the U or Th contents and secondly, changes in the Pb/U, Pb/Th and Pb isotopic composition correlated directly with changes in the Pb concentration. The individual 207Pb/206Pb apparent ages ranged from 4,000 Ma to 4,145 Ma, all greater than the inferred age of the crystal. A correlation between 207Pb/206Pb and Pb/U shows that the Pb excess has not resulted from recent Pb movement. The spot apparently gained radiogenic Pb about 2,500 Ma ago, at the same time as the majority of the other zircons in the rock suffered substantial Pb loss. The Pb movement occurred in response to a discrete geologic event. Reverse discordance is a phenomenon that must be considered when interpreting zircon U-Pb ages, especially 207Pb/206Pb ages of single crystals or portions of crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376756
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