start-ver=1.4
cd-journal=joma
no-vol=7
cd-vols=
no-issue=1
article-no=
start-page=27
end-page=34
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2000
dt-pub=20000920
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Chemical composition of clinopyroxenes associated with the gehlenite skarn from the Hirata outcrop, Kushiro, Tojo-Cho, Hiroshima Prefecture, Japan
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The clinopyroxenes of the hybrid rocks from the Hirata outcrop, Kushiro, Hiroshima Prefecture, Japan are grouped into(1)diopside, (2)aegirine, and (3)zoned pyroxene. The diopside occurs as isolated crystals enclosed in feldspars. The aegirine occurs along with late hydrous minerals in pore spaces. The zoned pyroxenes occur as discrete cryatals with wide rims growing interstitially between feldspar laths and show a continuous composition-al trend from diopside through hedenbergite and aegirine-augite to aegirine or titanian aegirine. The pyroxenes enclosed in feldspars and the cores of the zoned crystals have nearly same chemical composition. The late stage pyroxenes are characterized by extreme enrichment of sodium and sometimes titanium. The titanian aegirines studied hera are characterized by the predominance of the Na(Fe2+, Mg)0.5Ti0.5Si2O6 component over other Ti-bearing pyroxene components.
 The compositional trend of clinopyroxenes from the Hirata hybrid rocks follows a typical trend of peralkalne rocks. The peralkaline neture of the Hirata samples is a result of compositional change of magma accompanied by the metasomatic skarn formation.
en-copyright=
kn-copyright=

en-aut-name=HenmiChiyoko
en-aut-sei=Henmi
en-aut-mei=Chiyoko
kn-aut-name=逸見千代子
kn-aut-sei=逸見
kn-aut-mei=千代子
aut-affil-num=1
ORCID=

en-aut-name=KusachiIsao
en-aut-sei=Kusachi
en-aut-mei=Isao
kn-aut-name=草地功
kn-aut-sei=草地
kn-aut-mei=功
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KagetamaTatsuya
kn-aut-sei=Kagetama
kn-aut-mei=Tatsuya
aut-affil-num=3
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Earth Sciences, Faculty of Science, Okayama University

affil-num=2
en-affil=
kn-affil=Department of Earth Sciences, School of Education, Okayama University

affil-num=3
en-affil=
kn-affil=Shinagawa Refractories Co., Ltd.
en-keyword=aegirine
kn-keyword=aegirine
en-keyword=aegirine-augite
kn-keyword=aegirine-augite
en-keyword=diopside
kn-keyword=diopside
en-keyword=pyroxene
kn-keyword=pyroxene
en-keyword=hybrid rock
kn-keyword=hybrid rock
en-keyword=skarn
kn-keyword=skarn
END

start-ver=1.4
cd-journal=joma
no-vol=7
cd-vols=
no-issue=1
article-no=
start-page=19
end-page=20
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2000
dt-pub=20000920
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Native gold from Mikawa mine, Niigata Prefecture, Japan
kn-title=新潟県東蒲原郡三川村三川鉱山産の自然金
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Native gold was found at Mikawa mine, Niigata Prefecture, Japan. The mineral was associated with quartz in a druse within quartz-vein in propyrite. The crystals were formed in filiform, reticulated and dendritic shapes with about 1 mm length with 0.1 mm width and 0.05 mm thickness. Very malleable and ductile, opaque and yellow with metallic luster. Qualitative and semi-quantiative analyses were performed by the wavelength dispersive EPMA. Quantitatively, the crystals contained Au, Ag and Hg. Semi-quantitative analyses were executed with ZAF correction algorithm. The results showed that these specimens had a average chemical composition Au0.77 Ag0.11Hg0.12. This specimen was archived at our site with a collection number ESO-M01001.
en-copyright=
kn-copyright=

en-aut-name=YamakawaJunji
en-aut-sei=Yamakawa
en-aut-mei=Junji
kn-aut-name=山川純次
kn-aut-sei=山川
kn-aut-mei=純次
aut-affil-num=1
ORCID=

en-aut-name=TanabeMitsuo
en-aut-sei=Tanabe
en-aut-mei=Mitsuo
kn-aut-name=田邊満雄
kn-aut-sei=田邊
kn-aut-mei=満雄
aut-affil-num=2
ORCID=

en-aut-name=ShimadaKazumasa
en-aut-sei=Shimada
en-aut-mei=Kazumasa
kn-aut-name=島田和昌
kn-aut-sei=島田
kn-aut-mei=和昌
aut-affil-num=3
ORCID=

en-aut-name=HenmiChiyoko
en-aut-sei=Henmi
en-aut-mei=Chiyoko
kn-aut-name=逸見千代子
kn-aut-sei=逸見
kn-aut-mei=千代子
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Earth Science, Faculty of Science, Okayama University

affil-num=2
en-affil=
kn-affil=Okayama Mineral and Fossi club

affil-num=3
en-affil=
kn-affil=Okayama Mineral and Fossi club

affil-num=4
en-affil=
kn-affil=Department of Earth Science, Faculty of Science, Okayama University
en-keyword=Native Gold
kn-keyword=Native Gold
en-keyword=Mikawa Mine
kn-keyword=Mikawa Mine
en-keyword=electrum
kn-keyword=electrum
en-keyword=ESO-M01001
kn-keyword=ESO-M01001
END