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550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪me M置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s, S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴 By Kenitiro SuGulo* Abstract Compositions in some minor elements of Tertiary pelit圭c sedimen ture,Japan,in,35sur£ace samples and2subsur£ace samples are de bituminous shales f士om Thailand were analysed fbr comparisons。 Some considerations about the composition of above-mentio with recent bottom sediments ofShi煽i&nd Nak翫umi lakes are made. Possibly,the fピesh and brackish water sediments are much poor i marine deposits,as indicated by results of analysis,however more to confirm this hypothesis in these sediments。 夏臨r棚腿戯o臓賊Prev量ous Wo臨d踊S睡m鍛e Pre露e硫砥騰 Shimane Prefecture is one ofthe le&st studied areas withinJa with other regions of this country. A geologic map of the prov圭nce was elaborated in I962,gather (NlsHIYAMA and MluRA,1963).The map was published by the Sec ofthe Dep批rtment ofIndustry and Commerce ofMa血e Products Presently there were about ten relatively detailed papers dealing w however these papers contain only partial infbrm翫tions. The occl肛ence ofthe lignite in the Matsue Formation(Pliocene and Qμatemary geological fbrmations have propitiated the de these subjects.Furthermore,the occurrence of meta王1ic deposits(“1 molybdeniteり,,etc。)started a Hux of works related to these deposits。 A group of researchers from the Geological survey ofJapa working on hydrogeochemistryラbiogeochemistry and geology establish the environmenta1魚ctors th批t rule the precipitation ofu Presentlyラpublic organizations ofthe Shimane Pre琵cture,as the pecting and Development Agency,乱re accomplishing works of geochem量stry ofthe Geological Survey ofJ翫pan,headed by Dr。K』 hydrogeochemistry and biogeochemistry of pelitic sedimenta IzumoラMatsue and Ooda cities.The author ofthis paperラstaying翫s the Geological Survey ofJapan dur1ng the second semester of l970ラ pate in the neldworks and to use the collected samples to make an&1 composition ofthe examined samples. The author is gre飢ly indebted to Conselho Nacional de Pesquis :Brazi1)that provided the necessary fhnds during his rese我rches a *InstitutQ de Geociencias e Astronomia Departamento de Paleontologia e Estratigr SaoPauloβrasi1 27一(319)

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Page 1: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

550.42552.52551.778(52L82)

c⑪鵬P・s量t量膿量踊s⑪me M置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,

S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

      By

Kenitiro SuGulo*

                                 Abstract

     Compositions in some minor elements of Tertiary pelit圭c sediments of Shimane Prefec-

ture,Japan,in,35sur£ace samples and2subsur£ace samples are described,Three samples of

bituminous shales f士om Thailand were analysed fbr comparisons。

     Some considerations about the composition of above-mentioned rocks when compared

with recent bottom sediments ofShi煽i&nd Nak翫umi lakes are made.

     Possibly,the fピesh and brackish water sediments are much poor in trace elements than

marine deposits,as indicated by results of analysis,however more detailed dat翫are necessary

to confirm this hypothesis in these sediments。

               夏臨r棚腿戯o臓賊Prev量ous Wo臨d踊S睡m鍛e Pre露e硫砥騰

    Shimane Prefecture is one ofthe le&st studied areas withinJapanese territory,when compared

with other regions of this country.

    A geologic map of the prov圭nce was elaborated in I962,gathering all the available dat翫

(NlsHIYAMA and MluRA,1963).The map was published by the Section ofIndustrial Development

ofthe Dep批rtment ofIndustry and Commerce ofMa血e Products(Shimane Pre免cture)in1963。

Presently there were about ten relatively detailed papers dealing with the geology of this province,

however these papers contain only partial infbrm翫tions.

    The occl肛ence ofthe lignite in the Matsue Formation(Pliocene)and natural gas in Tertiary

and Qμatemary geological fbrmations have propitiated the development ofresearches concerning

these subjects.Furthermore,the occurrence of meta王1ic deposits(“1)lack-ore,’,‘‘uranium bearing

molybdeniteり,,etc。)started a Hux of works related to these deposits。

    A group of researchers from the Geological survey ofJapan,headed by Dr.A.MIzuNo,are

working on hydrogeochemistryラbiogeochemistry and geology of Nakaumi and Shinji lakes to

establish the environmenta1魚ctors th批t rule the precipitation ofuranium in n飢ural water systems.

    Presentlyラpublic organizations ofthe Shimane Pre琵cture,as the Metallic Ore Deposj,ts Pros-

pecting and Development Agency,乱re accomplishing works of detailed mapping.The group of

geochem量stry ofthe Geological Survey ofJ翫pan,headed by Dr。K』MoTQTIMA,翫re working with the

hydrogeochemistry and biogeochemistry of pelitic sedimentary rocksラTertiary in age,near to

IzumoラMatsue and Ooda cities.The author ofthis paperラstaying翫s visiting rese&rch associate at

the Geological Survey ofJapan dur1ng the second semester of l970ラhad the opportunity to p乱rtici-

pate in the neldworks and to use the collected samples to make an&1ysis regarding the trace elements

composition ofthe examined samples.

    The author is gre飢ly indebted to Conselho Nacional de Pesquisas(National Research Counci1一

:Brazi1)that provided the necessary fhnds during his rese我rches and.training in Japan;to Dr,K.

*InstitutQ de Geociencias e Astronomia Departamento de Paleontologia e Estratigra且a Universidade de Sao Paulo

  SaoPauloβrasi1

27一(319)

Page 2: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

駆7

地質調査所月報(第22巻第6号)MoToJ正MA and his group of geochemistry of the Geological survey ofJapan fbr their advices

duringthe五eldandlaboratoryworksandspeciaIlyto ML Shiro IToHfbrhishelpfα1suggestions and

orientation during the laboratory worksl to Mr.S.NAKAo of the Coal Section that fじmished one

copy ofhis unpublished work about minor elements composition ofbottom sediments ofNak乱umi

and Shi幻i lakes3to Dr.S.ToKuNAGA,chiefof the(〕oal Section fbr his constant orientation during

my works in the Geological survey ofJapan and finally to Dr.setembrino PETRI ofthe Institute of

Geoscience and Astronomy(Sao Paulo,Brazil)fbr the revision ofthe originalmanusαipt in English.

                   Ge聡e暫題亘Geo星ogy⑪奮重恥e Prov量蹴c㊧

   Shim&ne Prefecture is constituted.by a relatively narrow and.10ng band,situated between the

Japan Sea and the mountainland of“Chugoku,,(lnland part of the country).Furthermore,this

province fbrms the main portion ofthe“Honshu”island(main island ofJapan),designated“San-

in”and.embraces also the Oki Islandsンsituated in theJapan Sea(See ngure1)。

    The basement rocks are constituted by the Oki gneissesラprobably Pre-cambrian in age.Above

them there are Cretaceous intrusive rocks(granites,granodlorites and diorites),volcanic rocks

(rhylites and andesites)associated with hydroclastic and pyroclastic rocks(shales,sandstones and.

andesitic tufB)。The geologic fbrmatlons of the Tertiary(Miocene ahd Pliocene)are fbrmed by a

sequence of hydroclastlc and pyroclastic deposits being interposed by basalts and rhyolites.The

stratigraphy of the rocks of the Shimane Pre琵cture is complicated by differences in nomenclature

ofthe deposits of the mainland童n relation to correlated sediments ofthe Shimane Peninsula.The

Qμatemary geologic unities are constituted mainly by volcanlc focks and.gravels,sands and clays

of the Pleistocene and by alluvial and eolian(dunes)sands of the Holocene.

                           o瞬瓠量ves⑪奮鋤ew⑰出

   The study ofthe trace elements composition ofthe sedimentary rocks f}om Shimane Prefbcture

could eventually be usefhl fbr stratigraphical correlations,fbr reconstruction ofsedimentary environ-

ments and fbr researches on source rocks of the sedimentary rocks in this Province.

   On the other hand,according to recent authors(SANDERs,1966,pp.231-2363MANsKAYA

and,DRozDovAラ1968),the fbssil organic substances in the sedimentary rocks have a signi且cant

role,in various stages of their fbrmation,in the concentration of the trace elements.The fbrm of

occurrence of the trace elements(chemical precipitation,adsorption,etc。)in the materials of the

sedimentary rocks,has a great geological meaning.

   Howeverラthe available data on the composition ofthe sedimentary rocksin Shimane Prefbcture

arestillinsu伍cient,restricted only to data ofbulk samples,withoutanyinfbrmationdata conceming

the fbssil organic composition of the sediments。Soラwe shall report here only our partial results

establishing some comparisons with composition ofthese elements in recent bottom sediments from

Shinji and.Nakaumi lakes(according to unpublished data of NAKAo et a1。,1969)and with three

samples ofsediments fヒom Thailand釦mished by courtesy ofDL MoToJIMA.

                  S窺凱蔓》亙㊧s箆駅丑騰e Co脳至漏o爺s o£曲e A鶴箆亙ys量s

   The samples here considered are all pelitlc(claystones,shales and siltstones)圭ncluding32

sur魚cesamples,2subsur毎cesamples(collectedintheWanibuchi“black-ore’,mine)and,3samples

28一(320)

Page 3: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

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Page 4: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

8 1

3揺

Date

Table1

Sample

Description of the Samples(】011ected in Shimane Prefbcture in October1970and of the

:Bituminous Shales fピom Thailand Used fbr Trace Elements Analysis。

SH-1

SH-2

SH-3

SH-4

SH-5

SH-6SH:一7

SHl-8

SH:一9

SH-10

SH-11

SH-12

SH:一13

SH-14

SH-15

SH-16

SH-17

SH-18

SH-19

W-1

W-2

W-3

Oct.14

Oct.15

Oct.16

Locality Geologic horizon

Mihonoseki Village,Ui(≧μarry

Mihonoseki Village,S6dzu Loc。

Mihonoseki Village,Inazumi:Loc.

Mihonoseki Village,Ghikumi Loc.

Matsue CityラHo再o Loc.

M&tsue GityナIkima Loc.

Kash三ma VilL,Miyauchi Loc。

Kashima Vil1.,Etomo Loc.

Hirata City,:Kosakai Vill.,

Nakanote Loc.

HirataCity,K翫magadaniLoc、

Hirat翫City,Chig6:Loc,

Hirata City,Chig6,East ofport

Hir飢a GityりShita VilL,Kawashimo

Hikaw&VilL,Haraga Loc。

Hirata City,Fuse Loc.

Hirata City,Oku-Uga Loc.

H:irata Gity,Mid翫ni Loc。

Taisha Vi11.,Coop.ofFishery

Taisha Vil1.,H:inomisaki shrine

Wanibuchi Mine一(一150mleve1)

Wanibuchi Mine一(一200mlevel)

Wanibuchi Mine一(一225皿level)

Upper part ofIower Furue F.

Lower part ofJosoji F。

upPermost part,LowerJos砺i F.

UpPer part ofJosoji F.

upPer part ofJosqji F.

Furue F.

UpPer part ofJosoji F.

Lowermost part ofFurue F。

:Lowermost part ofFurue F.

UPPe「Part ofJosqji F。

Lower part ofJosqji F,

Lowermost part ofKoura F.

UpPermost Ushigiri:F。

Gas Sample

Med。to upPer pa,rt,Furue F。

Med。to upper part,Furue E

Lowermost part of Furue F.

Lower p翫rt ofJosoji F。

Ushigiri F,

Lower part ofJosqii F.

:Lower part ofJosoji F。

Lower part ofJosoji F.

Lithologic description

Grey shale

Black massive argillite

Black massive argillite

Brownish to black shale

Light brownish to black shale

Dark grey massive argi11ite

Grey shale

Black,hard shεし1e

Light brown to grey siltstone

Dark grey,very fine siltstone

Dark grey claystone

Dark grey,hard siltstone

Grey shale

Dark grey siltstone

Light brown to dark grey siltstone.

Light bluish grey siltstone

Grey shale

:L圭ght brownish grey shale

Grey shale(not analysed)

Grey shale

Grey shale

Remark

Marine

Marine

    〃

Brackish_

Freshwt.

Marine

Marine

柵痢

 遷

細)

ll1

1l 

l 

副可

l 

1

Page 5: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

銭 1

雷鵠

Sample

S且一20

SH-21

SH-22

SH-23

SH:一24

SH-25

SH-26

SHl-27

SH-28

SH-29

SHl-30

SH-31

SH-32

SHl-33

SHl-34

1-4

1-6

1-7

T-1

T-2

T-3

Date

Oct.17

Oct.18

Mr.

Iizuka,s

of琵r

Locality Geologic horizon

Matsue Gity,1ignite mine aband。

Matsue CityンLoc,Nogi,Fukutomi

Tamayu VilL,Tamayu street

Tamayu VilL,Ichyoda Valley entran.

Shi唾Vi1L,East Kimachi

Izumoαty,Hiebara:Loc.

Izumo City,Izumo H:igh Schoo1

Ooda City,Asayama VilL,Asak皿a

Ooda Gity,Kute Village

Ood我CityヲTorii Vi1L,Nitta

Ooda City,Torii Vi1L,Torii

Ooda Gity,Ooya Vi1L,Ooya

OodaCity,500mWKuriVillageOoda City,West ofKuriVillage

Kory6Vi1L,S of the Prefもct。

Taisha Vi1L,In我sa:Loc,

Taisha village

Taisha Village,Udo mine proxim,

Well no.11β4-85m depth

Well no.11,82.5-89.3m depth

Well no.11,140m depth

Matsue F.

Fushina F.

UpPer part ofKuri F.

Upper part ofFushina F.

:Lower part ofFushina E

UpPer part ofKuri F.

Upper part ofFushina F。

Kuri F.

OomoriF.UpPer part of Oomori E

Oomori F.

UPP弓r part ofKuri F・

UpPer p翫rt ofKuri F。

Lower part of Kuri F.

G乱s sample

Josqli F。

Josoji F。

.losoji F。

Mae Sot F.(Thailand)

Mae Sot F.(Thailand)

Mae Sot F。(Thailand)

Lithologic description

Siltstone(organic)

Sandy,very fine siltstone

Dark grey,very fine siltstone

Light bluish greyラGne sandstone

Bluish grey,medium sandstone

Light bluish grey siltstone

Light brownish grey,fine sandstone

Brownish grey,massive argillite

Grey,very{ine sandstone

Brownish grey,tu価ceous siltstone

Light bluish grey,fine siltstone

Brownish grey,massive argillite

Light brownish grey,fine siltstone.

Light brownish grey siltstone

Grey shale

Grey shale

Grey sh乱Ie

Oil shale十grey shale(r玉thmite)

0圭1shale

Grey shale

:Remark

Fresh water

Marine

Marine

Notes:

Fresh water

The samples SH-27and SH-31had received weathering action and near to SH-30collection locality there was a intrusbn ofa volcanic rock(very weathered),

The probable correlations ofthe geologic fbrm批tions between the Tertiary ofthe Shimane mainland part and Shimane peninsula are:

          Sh至mane Ma圭nland           Shimane Peninsula           Deposition environment                                             Matsue Formation           Freshwater

                                             Kawadzu Format圭on             Marine

          Fushina Formation             Furue Formation              Marine

          Oomori・:Formadon           Ushigiri;Wanibuchi Formation     Ma血e

          Kuri Formation            Josoji Formation            Marine                                             Koura Formation              Brackish to丘esh water

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Page 6: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

地質調査所月報(第22巻第6号)丘1mished by Mr.IIzuKA ofPre琵ctural Technological Research Center ofShim乱ne,collected fヒom

dif距rent parts ofthe Province.丁五ree samples f士omるores ofthe well no.11ラin Thailand,were also

analysed(See且gure l and table1)。

    E哩戯壁蹴e就朋se認3 JA:RRE:LL ASH co.

lines/inch grating.

3、4mEberttypeSpectrographwitha15,000

    Co臨魂壼豊⑪恥s⑪豊電臨e題期総亘ysis3

    a) 恥響躍説量⑪鵬o童曲εs我職欝且e5-Total weight=200mg of the mixture98.75%of

NaC1(buffer)一1。25%of CdO(intemal standard)were added to200mg of previously powdered,

sample.This kind ofpreparation was飼10wed in the unknown samples being analysed and in the

SPEX STANDARDS and in the standard rocks.

    b)S訟聰面躍sa蹴酔且es-Six standard samples of SPEX INDUSTRIES INC.(Metuchen,

N.」.ジUSA)each one containing49chemical elements in concentrations of O.0001%,0.001%,

0.0033%,0.01%,0.033%and O。1%,respectively,were used。Seven standardrocksamples,namely=

Gr1(granite),W-1(diabase),GSP-1(granodiorite),AGV-1(andesite),BC:R-1(basalt),JG-1

(granite fyom.lapan)and J:B-1(basalt fyom Japan)were used.The composition of G-1ンw-1,

GSP-1,AGV-1and BC:R-1were extracted from THoMpsoN,BANKsToN and PAsLEY(1969)and

FLANAGAN(1967).The compositions of JG-1and,.∫B一一1were obtai耳ed by ANDo,:KuRAsAwA,

OoMoRI and TAKEDA(1970).

    Co龍戯誠o聡s⑰淫既t餌池説io躯o髄壺e e《騨量麗朧e醜3Direct current(DC),220V-8A,exposure

time=90seconds,slit=20/1000mm,electrodes HITAcHI sPECIAL,photographic plates=

KODAK spectrum analysis no.1plates with developing time of3minutes.The photographic

spectrum plates so obtained was observed and.measured in a microphotometer(MPPON.IAR-

REL:L-ASH CO.:LT1)。).

                         Res闘且電s aし厭魂Ge聡e】で譲し旦Co蹴凱e望且重s

    The elements BラCo,α,Cu,Ga,Mn,Mo,Ni,Pb andVweresemiquantit乳tively determined,

as p血cipal trace elements in the samples here analysed.Moreover,Ag,Ba,BiラGe,:LiラSnりSr,As

and Zn were also investigated bllt their amounts were too little to make quantificationラbeing fye-

quently present in concentrations Iess than the detection capacity of the equipment used.In this

situation any quantification is not signi倉cant,due to the extremely low precision in the measure-

ments(Seeβgure no.2)。

    爵⑬㈱聡

    The total amplitude ofboroIl concentration is between10ppm(sample W-3)and120ppm

(SH-6and SH_16),and the medium value is50ppm.The stand乱rd deviation of all the samples

丘om Shimane Pre免cture here analysed is22。00。

    The concentration of boron in the sedimentary rocks is fyequently used.as a indicator to

establish the distinction between marine and non-marine rocks.In general it’s considered that the

boron precipitation is accentuated in environments of high salinities(:LEBEDov,1967).ILow con-

centrations were fbund in Matsue and Koura Formations,the且rst olle admittcd as laid down in

丘esh water environment and the second one in brackish to fピesh water environment。Eowever,

32一(324)

Page 7: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

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Page 8: 550.42552.52551.778(52L82)550.42552.52551.778(52L82) c⑪鵬P・s量t量膿量踊s⑪meM置鵬r E亘繍翻s oE Te眈i箆即y Pe灘c Se戯m麟s,S]臨豊醗a聡e葺騒e蛋ec宣魍蜜e,」題F,箆蹴

Gomposition in Some Minor Elements ofTertiary:Pelitic Sediments,Shimane:Pre騰cture,Japan(K SuGuIo)

equivalent low v批lues were fbund in typically marine sediments and so this assumption is question.

able。The same s1tuation was observed in』Nakaumi and Shir感i lakes bottom sediments by NAKAo

etaL(1969)。

   c⑪恥a且重

   The total amplitude ofcobalt concentration is between5ppm(SH-7and SE-8)and35ppm

(SH-6and SH-22),and the medium value is15ppm.The standard deviation calculated fbr the

cobalt was O。82ラshowing little variation around.the medium value。

   c恥ro識量既灘

   The total amplitude ofchromium concentration ranged between5ppm(W-3)to920ppm

(SH-17),and the medium value was290ppm.The standard deviation was9.86.

   co昼瀞er

   The total amplitude ofcopper concentration is situated between5ppm(sample S1{一12)and

1,200ppm(W-2),and the medium value was100ppm.The standard deviation was3.28。

    Concentrations ofcopper superior to500ppm乱ppear to be abnormal in the sedimentary rocks

価m ShimanePre飴ctureandwasfbundonlyin thesamplesW-2(1,200ppm)andW-3(900ppm)

due to mineraliz飢ion by“black-ore.,ラ

   Ga瞳腿m

   The total amplitude of gallium concentration ranged f士om10ppm(SE-1りSH-23,etc.)to

60ppm,and the medium value was35ppm.The standard deviation calculated fbr all samples

w批s10。69.

   Ma㎎踊ese

   The total amplitude ofmanganese concentration ranged f士om50ppm(SH-31)to8,000ppm

(SH-28),and the medium value was835ppm。The stand批rd deviation was106.85,showing very

dispersed values with concentrations certainly affected by weathering processes.

   Mo亘y賊e鯉騰

   Thls element was not detected in the majority ofthe examined samples.Concentrations higher

than in other s&mples were verified in SH-9(20ppm)and W-2(15ppm).

   N直e監e亘

   The total amplitude ofnickel concentration ranged fヒom5ppm(SH-1,SH-27,etc.)to110

ppm(SH-18),and the me⊂1ium value was30ppm。The standard deviation calculated fbr the

nickel was13.80.

   Le題di

   The total amplitude of lead concentration ranged between10ppm(SH-12,SH-13,etc。)to

870ppm(W-2),and the medium vahle was65ppm.The highest value(870ppm)is abnormal

and was veri盒ed only in the sample collected in the Wanibuchi“black-ore’,mine,but the sample

SH-22,co11ected in the su漁ce(Kuri Formation)showed also high value of lead concentration

(640ppm)。The stand&rd deviation was12。32,

33一(325)

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地質調査所月報(第22巻第6号)    Va踊a戯魍醗

    The total amplitude ofvanadium concentration ranged between5ppm(W-3)to2,650ppm

(SH-19)ラand the medium value was680ppm。The standard deviation calculated was4。10。

    The three samples fンom Thailand showed lower concentrations of all the trace elements here

exam萱ned when compared with the samples fピom Shimane Pre艶cture.The molybdenum was

absent in all the samples and the vanadium was detected only in one sample.The available data is

not suf資cient to explain the reasons fbr the d.if琵rences above-mentioned,however,it’s possible th乱t

non-marine sediments,as these from Thailand,are much poor in trace elements than marine ones,

The geology and the economic aspects(oi1-shales)of the Mae Sot FormationりThailand,fヒom

which these samples came,were investigated by HARAGucHI(1957).This飴ct can be veri盒ed in

the samples fヒom Shimane Prefヒcture,where Matsue and Kour批Formations showed concentrations

in trace elements lower than other fbrmations oftypically ma血e origin.

S⑪灘㊧C臓s姻鯉麟o鵬曲⑪鵬重keT鰍ceEle騰e齪sC⑪鵬脚s赫・餓・£腫㊧Te麓量躍y豆》e欝⑪説s

                我踊dl Bo麓o灘Sed遥me期,ts o£S臨且酪∫且ε息蹴d監N箆監a盟鰍蝿La駄e5

    1t,s impossible to make a direct comparison between compositions in trace elements ofTertiary

and recent bottom sediments because t五e involved魚ctors in their distributionラas the geochemical

conditions ofthe sedimentary environment,are very complicated批nd only免w dat乱are still avai1-

able。Moreover,there are certainly complex mechanisms due to the diagenetic processes in all

phases of lithogenesis and the chemical elements involved in these processes don’t have the same

behav玉or.

    However,a r&pid glance at the data presented by NAKAo et aL(1969)permit to reach the

conclusion that the great m勾ority ofcommon trace elements examined are similar to concentrations

fbund in the Tertiary sediments of Shimane Pre免cture・Moreover,perhaps higher concentrations

of some trace elements are re1翫ted to partial elimination of the intersticial waters in older sedi-

ments during their compaction。It’s possible to note that more erratic distribution ofsome elements

is verified in the Tertiary sediments than in the bottom sediments ofthe lakes,indicating a possible

action ofthe weathering in the older sediments。

                                    CO即しC旦腿S置0聡S

    a) These data of trace elements in Tertiary sediments fヒom Shimane Pre色cture are not

su伍cient to m批ke more detailed considerations.I think that is necessary to make a more detailed

analysis to know about their composition in dif琵rent sizes(clay,silt and sand)in order to get some

infbrmations on the fbrm of occurrence ofthese elements in the rocks.

    b)Whenmorenumerousanddet乱ileddatawillbeavailableonthetraceelementscomposition

ofthe Tertiary sediments and.the bottom sediments ofN乱kaumi and Shi両i1翫kes,and with infbr-

mations about the derivation ofthe lake sediments,physico.chemical cond三tions in the lake environ-

ment,etc.possibly we shall have good indications of the deposition environments of the Tertiary

sediments and its possible implications in the trace elements distribution。

    c) (】ertainly,the organic compounds are very ef£ective agent in the concentration of the

trace elements,as established by various authors三the analysis that Dr.K MoToJIMA’s group of

34一(326)

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Gomposition in Some Minor Elements ofTertiary Pelitic Sediments,Shimane Prefecture,Japan(K。SuGulo)

geochemistry will perfbrm will be ofgreat value fbr a more correct interpretation ofthe data here

presented,and£or fhture data that will be obtained by other investigators。

                       Re蛋e欝e恥ces

1) ANDo,A、,KuRAsAwA,E.,OoMoRIシS。and TAKEDA,E。(1970):Chemical Composition ofthe Geochemical

     standard Samples JG一】and JB-1,P7ψ7翻げ砂ηψ05彪窺oη0606h6?η♂56ワ(Nov。22to25,1970),

     78α」乞z64α診sh伽ゼz%o鎚γ,ノiのりごzπ(In Japanese)。

2) FLANAGAN,F.J.(1967):u,s。Geological survey silicate Rock Standards,(亨606h伽。θ渉σo銅06h6規。∠4磁。,

     voL31,PP。289-308。

3) HARAGucHI,K・(1957):Researches onBituminous Shales ofThailand,0θoJog加」踊撚,no・32(In.lapanese)・

4)LEBEDov,B.A、(1967)l TraceElementsinMarineandFresbWaterClays(Translated丘omGeokhlmiya,

     no.8,PP.1004-1007),(ヌ606h6η3ゼ3碇ア1磁67πα渉乞oπ認,vol.4,no。4,PP。821-824.

5)MANsKAYA,S.M.and DRozDovA,T。V.(1968):0606h6痂5孟ワげ07g傭oS2め.伽665,Translated andedited

      by L Shapiro and I.A.Breger・Intemational series ofuonographs in Earth Sciences,voL28,

      345PP㌧Pergamon Press、

6) NAKAo,S.et aL (1969)=1)露翻狛初オ乞onげ30ηzθ∠磁∫π07El6窺6アzJ59プ孟hθS6漉η観z渉5ゼπ孟h6ハ石ごzんα~卿εfαη4Shづ卿。猛o,

     Sαπ吻五)乞5擁o渉 (Preliminary Report),To be published in the Geological Survey Report(ln

     、lapanese with English Abstract)。

7) NlsHIYAMA,S。and至》IluRA,K。(1963):Exゆ」αη認o宅ツβooんげ渉h6(760Jo9乞o(zl M〔τρゲSh動zαη8P蟹脅譲z7θ(8(ンL乙E-

      1’200,000),Section of Illdustrial Development ofthe Department of Industry and Commerce of

      Nτarine Products(Shimane Prefもcture,1963).

8) SANDERs,M。B.(1966)=Origin of』Trace Metal Enrichment in Bituminous Shales,・44∂αn6652/z O79α漉0

      0800h8ηzゴs6ぴ,1966っP8γgαηzoηP’・653,1970,pp.231-236。

9)THoMpsoN,G.,BANKsToN,D.C、and PAsLEYラS。M.(1969):Trace Element Data fbr U。S。G、S.Re

      最)rence Silicate Rocks,C加ηzぎαzJ(3!θoJo,ξヅ,1969!1970,PP.215-221.

                       要  約

 主として島根県の新第三紀の中新世と鮮新世の地層より採取された泥岩中の微量成分,組成を発光分

光法により半定量分析で求めた。ここでは,B,Co,Cr,Cu,Ga,Mn,Mo,Ni PbとVの含有量を知るこ

とができた。Ag,Ba,Bi,Ge,Li,Sn,Sr,AsおよびZnはその分析感度以下の量しか存在しなかった。同

地域にて行なわれた中尾ら(1969)一未発表一の中海,宍道汽水湖の底質の分析結果とも比較をこころ

みた。

 多分,海水域堆積物では一般に微量成分の含有量が多いように思われるが,どちらも全岩試料のデー

タなので,このような分布の関係を議論するのは無理であろう。

35一(327)