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Distributions of Water Masses and Currents in Tachibana Bay, West of Ari-ake Sound, Kyushu, Japan (1999)

Matsuno, T. ; Shigeoka, M. ; Tamaki, A. ; [et al.]

Springer

Journal of oceanography 55 (1999), S. 515-529

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ISSN: 1573-868X

Keywords: Tachibana Bay ; water exchange ; T-S diagram ; tidal residual current ; ghost shrimp larvae

Source: Springer Online Journal Archives 1860-2000

Topics: Geosciences

Notes: Abstract We have investigated the water mass distribution and circulation in Tachibana Bay, which is located in the junction area between Ari-ake Sound and Amakusa-Nada in western Kyushu, Japan. This was done to clarify the mechanism by which ghost shrimp larvae, originating from a sandflat of Amakusa-Shimoshima Island, are transported. Temperature and salinity data repeatedly obtained over the area of Tachibana Bay show that relatively low salinity water lies over northern part of the bay, while high salinity water lies over southern part of the bay. The location of the low salinity water margin tends to depend on the amount of rainfall several days before the observation. A large amount of rainfall makes a clear boundary between low and high salinity waters. Current velocity data indicate an eastward mean flow just north of Tomioka, northern tip of Amakusa-Shimoshima Island, and a clockwise mean flow approaching the Tomioka Bay sandflat, which should be suitable for the on-shore transport of the ghost shrimp postlarvae. Current measurements with shipboard ADCP just west of Hayasaki Strait, at the entrance of Ari-ake Sound, show that a westward tidal residual current tends to incline to the north, with evidence of a density current in the northern part of the western Hayasaki Strait.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1007891424160

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Mn-BEARING HELLANDITE-(Y) FROM THE HEFTETJERN PEGMATITE, TORDAL, NORWAY (2015)

Miyawaki, R., Momma, K., Yokoyama, K., Shigeoka, M., Matsubara, S., Ito, M., Nakai, I., Kristiansen, R.

Mineralogical Association of Canada

In: Canadian Mineralogist

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Publication Date: 2015-10-17

Description: Mn-bearing hellandite-(Y) occurs as pinkish yellow granular crystals (up to sub mm) in the Sc-rich granite pegmatite at Heftetjern, Tørdal, Telemark, Norway. Associated minerals are quartz, albite, Sc- and Ce-bearing epidote, hingganite-(Y), and an undetermined Ca-bearing hingganite-related mineral. Electron microprobe analyses give an empirical formula as Ca 1.34 Mn 1.07 Y 2.75 Ce 0.02 Nd 0.02 Sm 0.01 Gd 0.01 Dy 0.05 Er 0.05 Yb 0.15 Al 0.94 Fe 0.08 Si 3.99 B 4.33 O 22.00 (OH) 2.00 on the basis of Al+Fe+Si = 5 and 24 anions per formula unit. The lattice parameters were refined from diffraction data obtained using a Gandolfi camera with an imaging plate and Ni filtered Cu K α; a 18.693(17), b 4.651(3), c 10.178(7) Å, β = 111.37(6)°, V 824.1(10) Å 3 . The crystal structure was refined from single-crystal XRD data obtained with a CCD-diffractometer and graphite-monochromated Mo K α. The refinement with anisotropic atomic displacement parameters converged to R 1 = 0.0269 for 1567 reflections [ I 〉 2( I )] and 0.0318 for all 1768 reflections, resulting in the structural formula M 3 (Ca 0.56 Mn 0.44 ) 2 M 4 (Y 0.43 Ca 0.23 Ln 0.14 0.20 ) 2 M 2 (Y 0.94 Ln 0.06 ) 2 M 1 (Al 0.92 Fe 0.08 )Si 4 B 4 O 21.21 (OH) 2.79 . In this hellandite-(Y), Mn 2+ replaces Ca 2+ at the M 3 site and there is a significant vacancy at the M 4 site. The T site is vacant, and, instead, the O5 position is occupied by (OH) – .

Print ISSN: 0008-4476

Topics: Geosciences

Published by Mineralogical Association of Canada

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Shimazakiite-4M and shimazakiite-4O, Ca2B2O5, two polytypes of a new mineral from Fuka, Okayama Prefecture, Japan (2013)

Kusachi, I., Kobayashi, S., Takechi, Y., Nakamuta, Y., Nagase, T., Yokoyama, K., Momma, K., Miyawaki, R., Shigeoka, M., Matsubara, S., Pring, A.

Mineralogical Society of Great Britain and Ireland

In: Mineralogical Magazine

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Publication Date: 2013-02-21

Description: Shimazakiite occurs as greyish white aggregates up to 3 mm in diameter. Two polytypes, shimazakiite-4 M and shimazakiite-4 O , have been identified, the former in nanometre-sized twin lamellae and the latter in micrometre-sized lamellae. Shimazakiite was discovered in an irregular vein in crystalline limestone near gehlenite-spurrite skarns at Fuka mine, Okayama Prefecture, Japan. Associated minerals include takedaite, sibirskite, olshanskyite, parasibirskite, nifontovite, calcite and an uncharacterized hydrous calcium borate. The mineral is biaxial (–), with the following refractive indices (at 589 nm): α = 1.586(2), β = 1.650(2), = 1.667(2) and 2V calc = 53° [shimazakiite-4 M ]; and α = 1.584(2), β = 1.648(2), = 1.670(2) and 2V calc = 54.88° [shimazakiite-4 O ]. Quantitative electron-microprobe analyses (means of 28 and 25 determinations) gave the empirical formulae Ca 2 B 1.92 O 4.76 (OH) 0.24 and Ca 2 B 1.92 O 4.76 (OH) 0.24 for shimazakiite-4 M and shimazakiite-4 O , respectively. The crystal structure refinements: P 2 1 / c , a = 3.5485(12), b = 6.352(2), c = 19.254(6) Å, β = 92.393(13)°, V = 433.6(3) Å 3 [for shimazakiite-4 M ]; and P 2 1 2 1 2 1 , a = 3.55645(8), b = 6.35194(15), c = 19.2534(5) Å, V = 434.941(18) Å 3 [for shimazakiite-4 O ], converged into R 1 indices of 0.1273 and 0.0142, respectively. The crystal structure of shimazakiite consists of a layer containing B 2 O 5 units (two near-coplanar triangular corner-sharing BO 3 groups) and 6- and 7-coordinate Ca atoms. Different sequences in the c direction of four layers are observed in the polytypes. The five strongest lines in the powder-diffraction pattern [listed as d in Å( I )( hkl )] are: 3.02(84)(022); 2.92(100)(104I) 2.81(56)(104); 2.76(32)(113); 1.880(32)(118I,126I,126,118) [for shimazakiite-4 M ]; and 3.84(33)(014); 3.02(42)(022); 2.86(100)(104); 2.79(29)(113); 1.903(44)(126,118) [for shimazakiite-4 O ].

Print ISSN: 0026-461X

Electronic ISSN: 1471-8022

Topics: Geosciences

Published by Mineralogical Society of Great Britain and Ireland

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Shimazakiite-4M and shimazakiite-4O, Ca2B2O5, two polytypes of a new mineral from Fuka, Okayama Prefecture, Japan (2013)

Kusachi, I. ; Kobayashi, S. ; Takechi, Y. ; [et al.]

Mineralogical Society of Great Britain and Ireland

In: Mineralogical Magazine. 2013; 77(1): 93-105. Published 2013 Feb 01. doi: 10.1180/minmag.2013.077.1.09.

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Publication Date: 2013-02-01

Description: Shimazakiite occurs as greyish white aggregates up to 3 mm in diameter. Two polytypes, shimazakiite-4M and shimazakiite-4O, have been identified, the former in nanometre-sized twin lamellae and the latter in micrometre-sized lamellae. Shimazakiite was discovered in an irregular vein in crystalline limestone near gehlenite-spurrite skarns at Fuka mine, Okayama Prefecture, Japan. Associated minerals include takedaite, sibirskite, olshanskyite, parasibirskite, nifontovite, calcite and an uncharacterized hydrous calcium borate. The mineral is biaxial (–), with the following refractive indices (at 589 nm): α = 1.586(2), β = 1.650(2), γ = 1.667(2) and 2Vcalc = 53º [shimazakiite-4M]; and α = 1.584(2), β = 1.648(2), γ = 1.670(2) and 2Vcalc = 54.88º [shimazakiite-4O]. Quantitative electronmicroprobe analyses (means of 28 and 25 determinations) gave the empirical formulae Ca2B1.92O4.76(OH)0.24 and Ca2B1.92O4.76(OH)0.24 for shimazakiite-4M and shimazakiite-4O, respectively. The crystal structure refinements: P21/c, a = 3.5485(12), b = 6.352(2), c = 19.254(6) Å , β = 92.393(13)°, V = 433.6(3) Å3 [for shimazakiite-4M]; and P212121, a = 3.55645(8), b = 6.35194(15), c = 19.2534(5) Å , V = 434.941(18) Å3[for shimazakiite-4O], converged into R1 indices of 0.1273 and 0.0142, respectively. The crystal structure of shimazakiite consists of a layer containing B2O5 units (two near-coplanar triangular corner-sharing BO3 groups) and 6- and 7-coordinate Ca atoms. Different sequences in the c direction of four layers are observed in the polytypes. The five strongest lines in the powder-diffraction pattern [listed as d in Å (I)(hkl)] are: 3.02(84)(022); 2.92(100)(10) 2.81(56)(104); 2.76(32)(113); 1.880(32)(11,12,126,118) [for shimazakiite-4M]; and 3.84(33)(014); 3.02(42)(022); 2.86(100)(104); 2.79(29)(113); 1.903(44)(126,118) [for shimazakiite-4O].

Print ISSN: 0026-461X

Electronic ISSN: 1471-8022

Topics: Geosciences

Published by Mineralogical Society of Great Britain and Ireland

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