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Geochemical mapping in Hokuriku, Japan: influence of surface geology, mineral occurrences and mass movement from terrestrial to marine environments

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Title: Geochemical mapping in Hokuriku, Japan: influence of surface geology, mineral occurrences and mass movement from terrestrial to marine environments
Authors: Ohta, Atsuyuki a.ohta@aist.go.jp, Imai, Noboru1, Terashima, Shigeru1, Tachibana, Yoshiko1, Ikehara, Ken1, Nakajima, Takeshi1
Source: Applied Geochemistry. Sep2004, Vol. 19 Issue 9, p1453-1469. 17p.
Subjects: Analytical geochemistry, Territorial waters, Regression analysis, Line geometry
Abstract: The authors have created terrestrial and marine geochemical maps of the Hokuriku region, Japan, and examined the background distribution of elemental concentrations. The terrestrial geochemical maps strongly reflect the surface geology and mineral occurrences. An analysis of variance (ANOVA) reveals the relationships between the distribution of surface geology and geochemical maps. Granite, metamorphic and felsic volcanic rocks, and sedimentary rock in accretionary complexes give rise to high concentrations of alkali metal, Be, Y, Ba, REE (except Eu), Tl, Th and U. The distributions of MgO, Al2O3, P2O5, CaO, 3d transition metals (except Cu), Ga, Sr and Eu are controlled by mafic volcanic and ultramafic rocks. The watersheds with above threshold levels for Cu, Zn, As, Cd, Mo, Sn, Sb, Hg, Pb and Bi strongly relate to the mineral occurrences, but ANOVA demonstrated that they are partly affected by surface geology.The marine geochemical maps exhibit control by 3 factors: calcareous sediments on the continental shelf, clay minerals on the continental slope and ocean floor, and sediments supplied from rivers. Many elemental concentrations are quite low in continental shelf sediment because of dilution by calcareous materials. The continental slope and deep valley sediments are rich in most elements except for MgO, CaO and Sr. Coarse sediments supplied from large rivers contribute to local enrichments of several elements such as K2O, Cr and Zn. The spatial distribution patterns of Cr and Zn concentrations show that gravity moves the river sediments over 60 km offshore along a deep-valley. [Copyright &y& Elsevier]
Copyright of Applied Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 13387508
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
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  Label: Title
  Group: Ti
  Data: Geochemical mapping in Hokuriku, Japan: influence of surface geology, mineral occurrences and mass movement from terrestrial to marine environments
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  Data: <searchLink fieldCode="AR" term="%22Ohta%2C+Atsuyuki%22">Ohta, Atsuyuki</searchLink><i> a.ohta@aist.go.jp</i><br /><searchLink fieldCode="AR" term="%22Imai%2C+Noboru%22">Imai, Noboru</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Terashima%2C+Shigeru%22">Terashima, Shigeru</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tachibana%2C+Yoshiko%22">Tachibana, Yoshiko</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ikehara%2C+Ken%22">Ikehara, Ken</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Nakajima%2C+Takeshi%22">Nakajima, Takeshi</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Geochemistry%22">Applied Geochemistry</searchLink>. Sep2004, Vol. 19 Issue 9, p1453-1469. 17p.
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  Data: <searchLink fieldCode="DE" term="%22Analytical+geochemistry%22">Analytical geochemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Territorial+waters%22">Territorial waters</searchLink><br /><searchLink fieldCode="DE" term="%22Regression+analysis%22">Regression analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Line+geometry%22">Line geometry</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The authors have created terrestrial and marine geochemical maps of the Hokuriku region, Japan, and examined the background distribution of elemental concentrations. The terrestrial geochemical maps strongly reflect the surface geology and mineral occurrences. An analysis of variance (ANOVA) reveals the relationships between the distribution of surface geology and geochemical maps. Granite, metamorphic and felsic volcanic rocks, and sedimentary rock in accretionary complexes give rise to high concentrations of alkali metal, Be, Y, Ba, REE (except Eu), Tl, Th and U. The distributions of MgO, Al2O3, P2O5, CaO, 3d transition metals (except Cu), Ga, Sr and Eu are controlled by mafic volcanic and ultramafic rocks. The watersheds with above threshold levels for Cu, Zn, As, Cd, Mo, Sn, Sb, Hg, Pb and Bi strongly relate to the mineral occurrences, but ANOVA demonstrated that they are partly affected by surface geology.The marine geochemical maps exhibit control by 3 factors: calcareous sediments on the continental shelf, clay minerals on the continental slope and ocean floor, and sediments supplied from rivers. Many elemental concentrations are quite low in continental shelf sediment because of dilution by calcareous materials. The continental slope and deep valley sediments are rich in most elements except for MgO, CaO and Sr. Coarse sediments supplied from large rivers contribute to local enrichments of several elements such as K2O, Cr and Zn. The spatial distribution patterns of Cr and Zn concentrations show that gravity moves the river sediments over 60 km offshore along a deep-valley. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Applied Geochemistry is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.apgeochem.2004.01.026
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      – Code: eng
        Text: English
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        PageCount: 17
        StartPage: 1453
    Subjects:
      – SubjectFull: Analytical geochemistry
        Type: general
      – SubjectFull: Territorial waters
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      – SubjectFull: Regression analysis
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      – SubjectFull: Line geometry
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      – TitleFull: Geochemical mapping in Hokuriku, Japan: influence of surface geology, mineral occurrences and mass movement from terrestrial to marine environments
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            NameFull: Ikehara, Ken
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            – D: 01
              M: 09
              Text: Sep2004
              Type: published
              Y: 2004
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