Hiroshi Hidaka - Academia.edu (original) (raw)
Papers by Hiroshi Hidaka
Science Advances
Little is known about the origin of the spectral diversity of asteroids and what it says about co... more Little is known about the origin of the spectral diversity of asteroids and what it says about conditions in the protoplanetary disk. Here, we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguishable from Ivuna-type (CI) chondrites, which are distinct from all other carbonaceous chondrites. Iron isotopes, therefore, demonstrate that Ryugu and CI chondrites formed in a reservoir that was different from the source regions of other carbonaceous asteroids. Growth and migration of the giant planets destabilized nearby planetesimals and ejected some inward to be implanted into the Main Belt. In this framework, most carbonaceous chondrites may have originated from regions around the birthplaces of Jupiter and Saturn, while the distinct isotopic composition of CI chondrites and Ryugu may reflect their formation further away in the disk, owing their presence in the inner Solar System to excitation by Uranus and Neptune.
Journal of Nuclear and Radiochemical Sciences, 2007
The Oklo uranium deposit at the Republic of Gabon, central Africa, had partly functioned as natur... more The Oklo uranium deposit at the Republic of Gabon, central Africa, had partly functioned as natural fission reactors. Many elements of the Oklo reactor zones and the related samples show the variations in the isotopic composition caused by a combination of nuclear fission, neutron capture, and radioactive decay. Isotopic studies provide useful information to estimate reactor conditions and to understand behavior of radionuclides in geological media. In my recent work, in-situ REE, Pb, and U isotopic analyses of individual tiny minerals in and around reactor zones have been performed using a Sensitive High Resolution Ion Micro-Probe (SHRIMP). The data suggest the adsorption property of apatite in trapping fissiogenic LREE and Pu migrated from the reactor zone, and distribution of fissiogenic REE under oxidizing atmosphere.
Journal of Agricultural and Food Chemistry, 1985
Journal of Agricultural and Food Chemistry, 1985
Bioscience, Biotechnology, and Biochemistry, 1994
Bioscience, Biotechnology, and Biochemistry, 1995
Geochimica Et Cosmochimica Acta Supplement, 2003
Physical Review C Nuclear Physics, 2004
Geochemical evidence of the double β decay of 100 Mo. Hiroshi Hidaka 1 * , Chi V. Ly 1 , and Kats... more Geochemical evidence of the double β decay of 100 Mo. Hiroshi Hidaka 1 * , Chi V. Ly 1 , and Katsuhiko Suzuki 2 1 Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan ...
Phys Rev C, 2004
Enrichment of the 100 Ru isotope, resulting from the double beta ( ββ ) decay of 100 Mo , has bee... more Enrichment of the 100 Ru isotope, resulting from the double beta ( ββ ) decay of 100 Mo , has been found in old molybdenites from Australia. Using Re Os ages determined here together with the amount of excess 100 Ru determined via isotope dilution mass spectrometry, consistent half-lives were obtained from two different molybdenite samples of varying ages (2.90 billion and 1.05 billion years old) with an average half-life of (2.1±0.3)× 1018 years. This half-life is highly consistent with the theoretical model for a two-neutrino ββ decay.
Physical Review C, 2004
ABSTRACT
Radiochim Acta, 2004
ABSTRACT
Scientific Reports, 2013
Barium isotopic compositions of primitive materials in the solar system are generally affected by... more Barium isotopic compositions of primitive materials in the solar system are generally affected by s- and r-process nucleosynthetic components that hide the contribution of the isotopic excess of (135)Ba formed by decay of radioactive (135)Cs. However, the Ba isotopic composition of the chemical separates from chondrules in the Sayama CM2 chondrite shows an excess of (135)Ba isotopic abundance up to (0.33 ± 0.06)%, which is independent of the isotopic components from s- and r-process nucleosyntheses. The isotopic excesses of (135)Ba correlate with the elemental abundance of Ba relative to Cs, providing chemical and isotopic evidence for the existence of the presently extinct radionuclide (135)Cs (t(1/2) = 2.3 million years) in the early solar system. The estimated abundance of (135)Cs/(133)Cs = (6.8 ± 1.9) × 10(-4) is more than double that expected from the uniform production model of the short-lived radioisotopes, suggesting remobilization of Cs including (135)Cs in the chondrules of the meteorite parent body.
Geochimica Et Cosmochimica Acta, 2007
Noble gas measurements were performed for nine aubrites: Bishopville, Cumberland Falls, Mayo Belw... more Noble gas measurements were performed for nine aubrites: Bishopville, Cumberland Falls, Mayo Belwa, Mount Egerton, Norton County, Peña Blanca Spring, Shallowater, ALHA 78113 and LAP 02233. These data clarify the origins and histories, particularly cosmic-ray exposure and regolith histories, of the aubrites and their parent body(ies). Accurate cosmic-ray exposure ages were obtained using the 81Kr-Kr method for three meteorites: 52 ± 3, 49 ± 10 and 117 ± 14 Ma for Bishopville, Cumberland Falls and Mayo Belwa, respectively. Mayo Belwa shows the longest cosmic-ray exposure age determined by the 81Kr-Kr method so far, close to the age of 121 Ma for Norton County. These are the longest ages among stony meteorites. Distribution of cosmic-ray exposure ages of aubrites implies 4-9 break-up events (except anomalous aubrites) on the parent body. Six aubrites show "exposure at the surface" on their parent body(ies): (i) neutron capture 36Ar, 80Kr, 82Kr and/or 128Xe probably produced on the respective parent body (Bishopville, Cumberland Falls, Mayo Belwa, Peña Blanca Spring, Shallowater and ALHA 78113); and/or (ii) chondritic trapped noble gases, which were likely released from chondritic inclusions preserved in the aubrite hosts (Cumberland Falls, Peña Blanca Spring and ALHA 78113). The concentrations of 128Xe from neutron capture on 127I vary among four measured specimens of Cumberland Falls (0.5-76 × 10 -14 cm 3STP/g), but are correlated with those of radiogenic 129Xe, implying that the concentrations of ( 128Xe) n and ( 129Xe) rad reflect variable abundances of iodine among specimens. The ratios of ( 128Xe) n/( 129Xe) rad obtained in this work are different for Mayo Belwa (0.045), Cumberland Falls (0.015) and Shallowater (0.001), meaning that neutron fluences, radiogenic 129Xe retention ages, or both, are different among these aubrites. Shallowater contains abundant trapped Ar, Kr and Xe (2.2 × 10 -7, 9.4 × 10 -10 and 2.8 × 10 -10 cm 3STP/g, respectively) as reported previously ( Busemann and Eugster, 2002). Isotopic compositions of Kr and Xe in Shallowater are consistent with those of Q (a primordial noble gas component trapped in chondrites). The Ar/Kr/Xe compositions are somewhat fractionated from Q, favoring lighter elements. Because of the unbrecciated nature of Shallowater, Q-like noble gases are considered to be primordial in origin. Fission Xe is found in Cumberland Falls, Mayo Belwa, Peña Blanca Spring, ALHA 78113 and LAP 02233. The majority of fission Xe is most likely 244Pu-derived, and about 10-20% seems to be 238U-derived at 136Xe. The observed ( 136Xe) Pu corresponds to 0.019-0.16 ppb of 244Pu, from which the 244Pu/U ratios are calculated as 0.002-0.009. These ratios resemble those of chondrites and other achondrites like eucrites, suggesting that no thermal resetting of the Pu-Xe system occurred after ˜4.5 Ga ago. We also determined oxygen isotopic compositions for four aubrites with chondritic noble gases and a new aubrite LAP 02233. In spite of their chondritic noble gas signatures, oxygen with chondritic isotopic compositions was found only in a specimen of Cumberland Falls (Δ 17O of ˜0.3‰). The other four aubrites and the other two measured specimens of Cumberland Falls are concurrent with the typical range for aubrites.
Introduction: Recent discoveries of lunar meteorites in the hot deserts and Antarctic ice field h... more Introduction: Recent discoveries of lunar meteorites in the hot deserts and Antarctic ice field have provided great impetus to lunar science. These meteorites provide potentially new insights into the petrologic history of unexplored regions of the Moon. Although chronological studies of lunar meteorites had been difficult because of their complex textures, recent in-situ U-Pb dating method has been successfully applied to brecciated meteorites and has enabled us to unravel the lunar evolution [2][3][5][6][7].
J Miner Petrol Sci, 2009
SHRIMP U-Pb dating of detrital zircons from the Sanbagawa Belt, Kanto Mountains, Japan: need to r... more SHRIMP U-Pb dating of detrital zircons from the Sanbagawa Belt, Kanto Mountains, Japan: need to revise the framework of the belt
Geochimica Et Cosmochimica Acta Supplement, May 1, 2005
Evidence for the existence of continental crust older than 4.06 Ga has so far been obtained only ... more Evidence for the existence of continental crust older than 4.06 Ga has so far been obtained only from zircons in the Yilgarn Craton of Western Australia. In this paper we report the first occurrence of a very old zircon with a U-Pb age of 4.2 Ga in the Acasta Gneiss Complex of northwestern Canada, based on a laser ablation-inductively coupled plasma-mass spectrometry and sensitive high-resolution ion microprobe study. The U-Pb data reveal that the 4.2 Ga zircon occurs as a xenocryst in a 3.9 Ga granitic rock. Trace element compositions of the xenocryst suggest that it crystallized from a granitic magma. Our results, suggesting the existence of granitic rocks outside the Yilgarn Craton at 4.2 Ga, imply that granitic continental crust was more widespread than previously thought, and that it was reworked into Early Archean continental crust.
Journal of Radioanalytical and Nuclear Chemistry, 1999
The Oklo and Bangomb6 uranium ores in the Republic of Gabon are fossils of natural fission reacto... more The Oklo and Bangomb6 uranium ores in the Republic of Gabon are fossils of natural fission reactors. Many elements in these natural fission reactors show isotopic anomalies derived from fission and neutron capture reactions. Isotopic analyses of uraninites and some other minerals provide useful information on the geochemical behavior of fission products and nuclear chemical characterization of the reactors. Integrated isotopic measurements by whole rock analysis with inductively coupled plasma mass spectrometry (ICP-MS) and thermal ionization mass spectrometry (TIMS) and by in-situ analysis with secondary ion mass spectrometry (SIMS) make it possible to clarify the migration processes of fissiogenic nuclides over a range of scales from micro meters to meters.
Science Advances
Little is known about the origin of the spectral diversity of asteroids and what it says about co... more Little is known about the origin of the spectral diversity of asteroids and what it says about conditions in the protoplanetary disk. Here, we show that samples returned from Cb-type asteroid Ryugu have Fe isotopic anomalies indistinguishable from Ivuna-type (CI) chondrites, which are distinct from all other carbonaceous chondrites. Iron isotopes, therefore, demonstrate that Ryugu and CI chondrites formed in a reservoir that was different from the source regions of other carbonaceous asteroids. Growth and migration of the giant planets destabilized nearby planetesimals and ejected some inward to be implanted into the Main Belt. In this framework, most carbonaceous chondrites may have originated from regions around the birthplaces of Jupiter and Saturn, while the distinct isotopic composition of CI chondrites and Ryugu may reflect their formation further away in the disk, owing their presence in the inner Solar System to excitation by Uranus and Neptune.
Journal of Nuclear and Radiochemical Sciences, 2007
The Oklo uranium deposit at the Republic of Gabon, central Africa, had partly functioned as natur... more The Oklo uranium deposit at the Republic of Gabon, central Africa, had partly functioned as natural fission reactors. Many elements of the Oklo reactor zones and the related samples show the variations in the isotopic composition caused by a combination of nuclear fission, neutron capture, and radioactive decay. Isotopic studies provide useful information to estimate reactor conditions and to understand behavior of radionuclides in geological media. In my recent work, in-situ REE, Pb, and U isotopic analyses of individual tiny minerals in and around reactor zones have been performed using a Sensitive High Resolution Ion Micro-Probe (SHRIMP). The data suggest the adsorption property of apatite in trapping fissiogenic LREE and Pu migrated from the reactor zone, and distribution of fissiogenic REE under oxidizing atmosphere.
Journal of Agricultural and Food Chemistry, 1985
Journal of Agricultural and Food Chemistry, 1985
Bioscience, Biotechnology, and Biochemistry, 1994
Bioscience, Biotechnology, and Biochemistry, 1995
Geochimica Et Cosmochimica Acta Supplement, 2003
Physical Review C Nuclear Physics, 2004
Geochemical evidence of the double β decay of 100 Mo. Hiroshi Hidaka 1 * , Chi V. Ly 1 , and Kats... more Geochemical evidence of the double β decay of 100 Mo. Hiroshi Hidaka 1 * , Chi V. Ly 1 , and Katsuhiko Suzuki 2 1 Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan ...
Phys Rev C, 2004
Enrichment of the 100 Ru isotope, resulting from the double beta ( ββ ) decay of 100 Mo , has bee... more Enrichment of the 100 Ru isotope, resulting from the double beta ( ββ ) decay of 100 Mo , has been found in old molybdenites from Australia. Using Re Os ages determined here together with the amount of excess 100 Ru determined via isotope dilution mass spectrometry, consistent half-lives were obtained from two different molybdenite samples of varying ages (2.90 billion and 1.05 billion years old) with an average half-life of (2.1±0.3)× 1018 years. This half-life is highly consistent with the theoretical model for a two-neutrino ββ decay.
Physical Review C, 2004
ABSTRACT
Radiochim Acta, 2004
ABSTRACT
Scientific Reports, 2013
Barium isotopic compositions of primitive materials in the solar system are generally affected by... more Barium isotopic compositions of primitive materials in the solar system are generally affected by s- and r-process nucleosynthetic components that hide the contribution of the isotopic excess of (135)Ba formed by decay of radioactive (135)Cs. However, the Ba isotopic composition of the chemical separates from chondrules in the Sayama CM2 chondrite shows an excess of (135)Ba isotopic abundance up to (0.33 ± 0.06)%, which is independent of the isotopic components from s- and r-process nucleosyntheses. The isotopic excesses of (135)Ba correlate with the elemental abundance of Ba relative to Cs, providing chemical and isotopic evidence for the existence of the presently extinct radionuclide (135)Cs (t(1/2) = 2.3 million years) in the early solar system. The estimated abundance of (135)Cs/(133)Cs = (6.8 ± 1.9) × 10(-4) is more than double that expected from the uniform production model of the short-lived radioisotopes, suggesting remobilization of Cs including (135)Cs in the chondrules of the meteorite parent body.
Geochimica Et Cosmochimica Acta, 2007
Noble gas measurements were performed for nine aubrites: Bishopville, Cumberland Falls, Mayo Belw... more Noble gas measurements were performed for nine aubrites: Bishopville, Cumberland Falls, Mayo Belwa, Mount Egerton, Norton County, Peña Blanca Spring, Shallowater, ALHA 78113 and LAP 02233. These data clarify the origins and histories, particularly cosmic-ray exposure and regolith histories, of the aubrites and their parent body(ies). Accurate cosmic-ray exposure ages were obtained using the 81Kr-Kr method for three meteorites: 52 ± 3, 49 ± 10 and 117 ± 14 Ma for Bishopville, Cumberland Falls and Mayo Belwa, respectively. Mayo Belwa shows the longest cosmic-ray exposure age determined by the 81Kr-Kr method so far, close to the age of 121 Ma for Norton County. These are the longest ages among stony meteorites. Distribution of cosmic-ray exposure ages of aubrites implies 4-9 break-up events (except anomalous aubrites) on the parent body. Six aubrites show "exposure at the surface" on their parent body(ies): (i) neutron capture 36Ar, 80Kr, 82Kr and/or 128Xe probably produced on the respective parent body (Bishopville, Cumberland Falls, Mayo Belwa, Peña Blanca Spring, Shallowater and ALHA 78113); and/or (ii) chondritic trapped noble gases, which were likely released from chondritic inclusions preserved in the aubrite hosts (Cumberland Falls, Peña Blanca Spring and ALHA 78113). The concentrations of 128Xe from neutron capture on 127I vary among four measured specimens of Cumberland Falls (0.5-76 × 10 -14 cm 3STP/g), but are correlated with those of radiogenic 129Xe, implying that the concentrations of ( 128Xe) n and ( 129Xe) rad reflect variable abundances of iodine among specimens. The ratios of ( 128Xe) n/( 129Xe) rad obtained in this work are different for Mayo Belwa (0.045), Cumberland Falls (0.015) and Shallowater (0.001), meaning that neutron fluences, radiogenic 129Xe retention ages, or both, are different among these aubrites. Shallowater contains abundant trapped Ar, Kr and Xe (2.2 × 10 -7, 9.4 × 10 -10 and 2.8 × 10 -10 cm 3STP/g, respectively) as reported previously ( Busemann and Eugster, 2002). Isotopic compositions of Kr and Xe in Shallowater are consistent with those of Q (a primordial noble gas component trapped in chondrites). The Ar/Kr/Xe compositions are somewhat fractionated from Q, favoring lighter elements. Because of the unbrecciated nature of Shallowater, Q-like noble gases are considered to be primordial in origin. Fission Xe is found in Cumberland Falls, Mayo Belwa, Peña Blanca Spring, ALHA 78113 and LAP 02233. The majority of fission Xe is most likely 244Pu-derived, and about 10-20% seems to be 238U-derived at 136Xe. The observed ( 136Xe) Pu corresponds to 0.019-0.16 ppb of 244Pu, from which the 244Pu/U ratios are calculated as 0.002-0.009. These ratios resemble those of chondrites and other achondrites like eucrites, suggesting that no thermal resetting of the Pu-Xe system occurred after ˜4.5 Ga ago. We also determined oxygen isotopic compositions for four aubrites with chondritic noble gases and a new aubrite LAP 02233. In spite of their chondritic noble gas signatures, oxygen with chondritic isotopic compositions was found only in a specimen of Cumberland Falls (Δ 17O of ˜0.3‰). The other four aubrites and the other two measured specimens of Cumberland Falls are concurrent with the typical range for aubrites.
Introduction: Recent discoveries of lunar meteorites in the hot deserts and Antarctic ice field h... more Introduction: Recent discoveries of lunar meteorites in the hot deserts and Antarctic ice field have provided great impetus to lunar science. These meteorites provide potentially new insights into the petrologic history of unexplored regions of the Moon. Although chronological studies of lunar meteorites had been difficult because of their complex textures, recent in-situ U-Pb dating method has been successfully applied to brecciated meteorites and has enabled us to unravel the lunar evolution [2][3][5][6][7].
J Miner Petrol Sci, 2009
SHRIMP U-Pb dating of detrital zircons from the Sanbagawa Belt, Kanto Mountains, Japan: need to r... more SHRIMP U-Pb dating of detrital zircons from the Sanbagawa Belt, Kanto Mountains, Japan: need to revise the framework of the belt
Geochimica Et Cosmochimica Acta Supplement, May 1, 2005
Evidence for the existence of continental crust older than 4.06 Ga has so far been obtained only ... more Evidence for the existence of continental crust older than 4.06 Ga has so far been obtained only from zircons in the Yilgarn Craton of Western Australia. In this paper we report the first occurrence of a very old zircon with a U-Pb age of 4.2 Ga in the Acasta Gneiss Complex of northwestern Canada, based on a laser ablation-inductively coupled plasma-mass spectrometry and sensitive high-resolution ion microprobe study. The U-Pb data reveal that the 4.2 Ga zircon occurs as a xenocryst in a 3.9 Ga granitic rock. Trace element compositions of the xenocryst suggest that it crystallized from a granitic magma. Our results, suggesting the existence of granitic rocks outside the Yilgarn Craton at 4.2 Ga, imply that granitic continental crust was more widespread than previously thought, and that it was reworked into Early Archean continental crust.
Journal of Radioanalytical and Nuclear Chemistry, 1999
The Oklo and Bangomb6 uranium ores in the Republic of Gabon are fossils of natural fission reacto... more The Oklo and Bangomb6 uranium ores in the Republic of Gabon are fossils of natural fission reactors. Many elements in these natural fission reactors show isotopic anomalies derived from fission and neutron capture reactions. Isotopic analyses of uraninites and some other minerals provide useful information on the geochemical behavior of fission products and nuclear chemical characterization of the reactors. Integrated isotopic measurements by whole rock analysis with inductively coupled plasma mass spectrometry (ICP-MS) and thermal ionization mass spectrometry (TIMS) and by in-situ analysis with secondary ion mass spectrometry (SIMS) make it possible to clarify the migration processes of fissiogenic nuclides over a range of scales from micro meters to meters.