Based on the analysis of different dating methods of isotopic system and the dating results of the metamorphic mafic-ultramafic rocks in Shunchang, Northern Fujian, it s proposed in the paper that the U-Pb method of single zircon and the method of the whole-rock Sm-Nd isochronic age should be taken as the main ways for dating metamorphic mafic-ultramafic rocks in the orogenic belts. The discovery of younger ages dating with the Rb-Sr, 40Ar-39Ar and K-Ar methods suggests that caution is warranted in using these isotopic systems to date metamorphic mafic-ultramafic rocks.通过对不同同位素体系测年方法的分析, 并结合闽北顺昌镁铁 - 超镁铁杂岩的系统同位素年代测定结果, 提出造山带中变质镁铁 - 超镁铁岩的年代测定应以颗粒铅石U-Pb 法和全岩Sm-Nd 等时线法为主, 对Rb-Sr 、40Ar-39Ar 和K-Ar 同位素测年结果的应用应持慎重态度。published_or_final_versio

Li, J

Ren, S

Sun, M

Zhou, X

HKU Scholars Hub

TitleReview on the different method of dating mafic-ultramafic rocksin the orogenic belt - taking the Shunchang massif as anexampleAuthor(s) Ren, S; Sun, M; Li, J; Zhou, XCitation Geology of Fujian, 1996, v. 15 n. 1, p. 55-62Issued Date 1996URL http://hdl.handle.net/10722/72463Rights Creative Commons: Attribution 3.0 Hong Kong License? 1 ? ? ? ? ? G e o lo g y o f F u jia n?????? ???????????????????????? ¹???(????????? , ?? , 10 0 0 8 3)? ?(??????? , ?? )??? ???(???????? , ?? , 10 0 0 29 )? ? ????????????????? , ??????????????????????????? , ?????????????????????????? u ?Pb ???? S m -N d ?????? , ? R ? s r ? ??A r ?3 , A r ? K ? A r ???????????????? ???? ?????? ????????? ????1 ???????????????????????????????????? ? ?? ?? , ????????????? ? ??????????????????????????????????????????????? ? ??? , ?? R b ?sr ? s m ?N d ? ????U?Pb ????? U ?Pb ?????????? , ??????????????????????????? ? ???? , ?????????? ????????????????????????????? , ?? , ????????????????????????????????????? , ??? ?????????? ??????????????????????????????????????????????????????????? ?2 ?????????????????????????????????? (????????? ) ???????? , ???? ??? (?? ) ???????????????? ? ??? , ???????? 19 9 5 ? 12 ? 25 ??? ?¹ ??????????? ? ?? ? ? ? G e o ?o g y o f F u ji a n ? ? ????????????????? , ??????????????????? , ???????????????????? , ??????????????? , ???????? ?????????? ?? ? [sj , ???????????? ? ???????????? ,?????????? , ?????????????????????????? ? ?????? , ??????????????? , ?????????????? (r es et ) , ??????????????????????? , ???????????? ? ?? , ????????? , ???????????????????????? , ???????????????????????? ? ???????????????????? ?2.I K?A r? ?O A r ? 3 9A r ? R b ?s r ??????? K ?Ar ? ??A r ? 3 9A r ? R b ?sr ??????????? (??? 5 0 0 ?C ) ????????? (? 1 ?? 1 ) , ?? K ? A r ? R b ? s r ? 4 ???????????????????? , ?? , ???????????????????? , ? K ?Ar ? ??Ar ? 3, Ar ? R b ?Sr ????????????????? ??? , ?????????????????? A r (?? A r ??? A r ) , ????????????????? , ??????????? K ?Ar ? ??Ar ? 39 A r ?????????? ?2?2 S m?N d ??S m?N d ???????????? :¹ S m ? N d ???????? , ?????? ? ???? ;º ???? ????????? , ??????? ( ? 7 S m ) ??????? (?N d) ??????????????? ;» ? 7S m ?????? (l . 06 x 10 ?? ) , ???????????? ??? ???? S m ?N d ?????????????????????? ??????????????????????? ?2?3 U ? p b ???? U ??? ??? ( ?3 5U ? ?3 8U ) ?????? p b ??? ( 2?, P b ? 2 0 6 Pb ) , ?????? U ? p b ???? p b ?????? , ???????? ( 2?, Pb ? 20 6Pb ? ??, P? 235u ? ??6Pb? , 38 u ) ,????????????????????? u ?P b ????????? ?????????????? , ???????? ? , ?????? (? 1 ) , ??? u -P b ????????? ? ???????????????? ? ?? ? ??????????? , ???????????????? ? ?????????????????????????? , ???????????????????? , ???????????????????? ? ??? , ???? U ?Pb ??????? , ???????????????????????? , ???????????? ??? ? ????????? , ??????????? ?????? ??????? ??????? , ?????????? ????? , ???????? :? l ? ???? : ? ????? ??????????????nUO?nU0nUnUn?Ob42???? ( M a? l ????????? (? R o lo in s o n , 1 9 9 3 )F ig.I D ?gr a m s h o w i n g th e e n c l?ed t e m pe ra tu r e s o f s o m e m i n e ra ls? 1 ????????? (??????? 1? 10 ? / Ma)T a b le 1 E n e l??d te m pe ra tu res o f so m e m i n e ra is in th e d i ff e re n t is o to Pi e sy s t e m? ? ? ? ? ? ( ? ) ? ?K ?A r ???? 1 5 0? 2 50 12 5? 2 50l ??? 3 0A r ?A r ??? 3 5 0? 4 00? ? ??? 4 5 0? 5 00 1 6 0R b ?S r ??? 3 2 0 10 0 0? ??? 3 50? ??? 4 5 0? 5 0 0U ?Pb ??? 3 5 0? 5 5 0 2 0 0? 1 00 0? ??? 3 8 0? 4 2 0 1 3 0? 4 3 0? ?? 5 0 0? 6 7 0 5 0 0?3 0 0 0 0??? 6 5 7? 7 4 0 4 0? 2 0 0???? > 8 0 > 5 0? ? > 9 0 0? : ?????? , 1 9 9 3 ( ? M e z g e r , 1 9 9 0 ) ?¹ ?????????????? , K ?Ar ? ?OA r? 39 Ar ? R b ?sr ????? ?????????????? ;º u ?Pb ??????????????????????? , ????????????????? ;» s m ?N d ??????????????? , ???????????????????????? , ??????????? , ??????????????? ?? ? ? ? G e o ?o g y o r F u jia n ? ? ?3 ??????????????????????????? 2 k m ? , ????????? ??????? ? ?????????????????????? , ?????????? ?????? 20 ? 4 0 c m ?????????? (???? : 8 50 ?6 50 ) ? ????????????????????? , ????????? , ????????? ? ????????????? (????? : 4 50 ?6 00? 3 5 0? 4 0 0 ) ???????????????? , ?????????????? ? ???????????????????? :??? : ????? , ???? ? ????????? (4 5 % ? ) ? ??? (5 0 % ? ) , ??????????? ? ???? 0 . 4? 3 m m ???? ? ??????????? , ??????? , ??????????????????? , ?????????????? , ??????????? ; ???? 0 . 5? 3 . 0 m m ???????? , ????????????????????? , ?????? , ?????????? , A n ? 58 (?????????? ) , ?????????????? ???? : ?????? , ?????? ? ?????????? ? ???? ? ??????? , ?????????? , ???????? ??? ?? ? ???????? , ???????????????? , ??????????? ???????????? (?????? ) ??? ? ?????????? , ????? ????????????????? , ????? ??????????????????? ?3.I K?A r? ?O A r? 3 9 A r ????????????? K ?A r ??????? 1 27 . 9 ? 3 . 7 M a (? 2 ) ?? 2 ???????? K ?A r ??????T a b le 2 D a?9 resu lts (b y th e K ?A r me th od ) o f pyr ibo les fr o m th e S h u n eh a n g m ?if?? K ?o A r (r a d ) 40 A r (r a d ) ????(% ) (??? / ? ) (? ) (M a )X C 9 2 2 0 0.6 5 1.4 9 4 ? 1 0 ? 10 8 5 . 2 9 1 2 7 . 9? 3 . 7???? Ar ?Ar ?????????? 3 ?? 2 ? ????????? (4 0 0 ? ) ????? ?Ar ???? 0 . 61 % ) ??????? (l 6 28 Ma) ?? , ???????????????????? ??? Ai ??????????? ? ?? 3 ?? 2 ??? , ??Ar ? 39 Ar ???????? 3 36 . 4 M a , ??????????? 1 62 ? 1 63 M a (3 9Ar ???? 40 . 3 % )? 1 79 ? 1 82 M a (39 Ar ???? 62 . 57 % ) ???? , ???????????? (81 . 4 Ma ?96.5 M a ), ????????????????? ?3.2 ???? u ?Pb ??? x c g 2 0 4 ??? (??? ) ????????????????? 4 ? ? ? 1 ????? ? ???? : ? ????? ?????????????? 5 9? 3 ????????A r? ?A r ??????T a b le 3 D a tin g res u lis (b y th e?oA r ? , . A r m e t hod )o f ?b b r? fro m th e S h u n e h a n g m ??if?? / ?? (? ) 4 0 A r ? 3 9 A r ?o A r ? 3 9A r 3 7A r ? 39 A r 3 9 A r ( ? 1 0 ? ?Z m o l) 3 9 A r (% ) ??? (M a )1 / 4 0 0 1 6 7 0.1 4 0.6 6 0.0 9 8 0.6 1 16 2 8.2? 3 3 . 02 / 7 0 0 11 0.0 2 0.1 3 0.5 8 9 3.67 8 1,4 ? 2 . 43 / 8 5 0 17 0.0 4 0.2 2 0.2 9 3 1.8 3 9 6.5? 2 . 84 / 9 5 0 13 0.0 2 0.1 0 2.5 10 1 5.6 5 16 3.0? 4 . 75 ?0 5 0 1 1 0 . 0 1 0 . 1 3 2 . 3 5 5 1 4 . 6 8 16 2 . 1? 4 . 76? 15 0 12 0 . 0 1 0 . 1 3 1 . 9 6 3 1 2 . 2 4 18 1 . 8 ? 5 . 27 ?3 0 0 1 3 0 . 0 1 0 . 0 9 8 . 07 5 5 0 . 3 3 1 7 9 . 2 ? 5 . 18 ?5 5 0 1 09 0 . 3 0 0 . 6 2 0 . 16 1 1 . 0 0 3 3 6 . 4? 1 1 . 7?X C : NP- 3? 1 008462.? 3 9 A r ( % )? 2 ?????4. Ar ??Ar ????F i g . 2 D i a?a m sh o w i n g th e ?. A r? ?. A r da tin g res u lts o f ga b roes in S h u n e han g , N o rt h e rn F u jis n? 4 ??????????? U ?Pb ?????????T a b le 4 D a t i n g r es u lts ( by th e U?Pb m e thod ) of sin gl e c ys ta?I i n e z ir e o ?? fr o m th e S h u n c h a n g m ??i f? ?? ( pp m ) u ?Pb ? ? ? ? ? ? ? ????? (Ma)? U Pb 2 0 6 Pb - 2 08 P b - 2 0 6P b ? 2 38 U 20 7 Pb - 2 07 P b - Zo 6 Pb - 2 07 Pb - 20 7 Pb -2 04 P b 20 ?Pb 23 5 U 20 6 Pb 23 ?U 2 35 U Z o6 Pbl 1 1 0 5 1 3 1 1 2 1 0.3 5 7 9 0.0 6 4 7 7 0 4 7 4 6 0.0 5 3 1 4 4 0 4.6 3 9 4.3 3 3 4.72 9 9 1 8 3 3 6 2 0.2 4 5 8 ( 2 7 ) ( 2 1 5 ) ( 2 2 7 ) 4 0 3.2 4 0 2.4 3 9 7.60.0 6 4 5 5 0 4 8 6 3 0.0 5 4 6 4( 2 8 ) ( 1 29 ) ( 13 6 )?? ????????????????????? 3 34 ? 4 05? , ??? 10 ? , 2 ??????????????? , ??? 20 ? ?, ??????????????? ? ?????? : 1 ??? U ?P b ?Ma (???07 P b? ?35 u ??07 P b ??06 Pb ? ????????? , ??????6 0 ? ? ? ? G e o lo g y o r F u jia n ? 15 ???? ? ???????? ) ; 2 ??? u ?Pb ????? 3 97 ? 40 3 M a ????? , ????????????? 2 06 Pb ?238 U ?????????? , ????????????????????? , ????????????????????????????? , ? 2 06 P b?238 u ?????????????? (?? ) ??? , ?? ????? ??? ???? ?? ? ? ? 4 ???? ? ? 2 06 Pb ?238 U ??? ?????? , ? ??4 0 4?6 M a? 4 0 3 ? 2 M a , ?? , ????? 2 0 6 p b ? 2 3 8U ? Z o 7 p b ? , 3 5U ?????????????4 03?9? 1 ? 2 Ma (? 3 ) , ?????06 P b ?238 U ????????? , ???????????????? ?3?3 R b ?s r?S m?N d ??????????? R b ?Sr ????????? 5 ? ???? 5 ?????????????? , ???? X C 9 2 0 6 ? X c 9 2 2 0 ??7 S r / 8 6 S r ????? , ? ?7 R b / 8 6s r ????? , ???????? R b ?s r ?????????? ? ?? , ? x e 9 2 0 3 ? x e 9 2 0 4 ? x e 9 2 17 3 ?????????? 3 56 ? 25 M a ? R b / Sr ????? (? 4) ???????????????? ?0.7 1 5 0 r es ?????- ?- - - - - - -A = 0 . 7 0 6 5 7 4 ? 0 . 0 0 0 3 4 3T = 3 5 6.2 ? 2 5 . 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(42 1? 8 M a , ? 5) ???? , ??????????????????? ?? 6 ???? sm ?N d ???????T a b le 6 A n a ly sis res u lts o f th e S m?N d iso to Pe s fro m th e e o m Ple x in S h u n e h a n g,N o rt h e rn Fu jia n?? s m N d ??7 s m / , 4 4 N d ??3 N d / , 4 ?N d Z a (, ?3 N d / , ??N d )t E N d o E N d ?X C 9 2 03 4.7 1 28.4 6 0.1 0 0 0 2 0.5 1 2 1 0 1 3 5 0.5 1 18 4 ? 10 . 5 ? 5 . 5X C 9 2 0 4 3.4 4 16 7 5 0 1 2 4 2 6 0.5 1 2 1 6 5 1 7 0.5 1 18 4 ? 9 . 2 ? 5 . 5X C 9 2 0 6 1.9 7 9.0 4 0.1 2 6 5 0 0.5 1 19 0 0 4 1 0.5 1 15 7 ? 1 4 . 4 ? 10 . 8X C 9 2 17 5.2 4 2 9.8 2 0.1 0 89 1 0.5 1 2 1 1 6 1 4 0.5 1 1 8 3 ? 10 . 2 ? ?, 6X C 9 2 2 0 5 4 7 3 4.2 4 0.1 3 19 1 0.5 1 2 0 3 3 2 7 0 5 1 16 9 ? 1 1 . 8 ? 8 . 4? : ??? ? t? 40 ) M a ?? ?0.5 12 40.5 1 2 3A = 0.5 1 1 8 1 6 ? 0 . 0 0 0 0 6 4T = 4 2 1 ? 8 7 . 7 M aE N d?= ?5.4 9 ? 1 . 2 5R = 0.9 9 2 40.5 1 2 20.5 12 1X ?? 9 2 0 4? ?2??????N**/P?().5 1 2 00.5 1 1 9 L???~???????????????0 . 0 7 0 0 0 8 0 0 . 0 9 0 0 . 1 0 0 0 . 1 10 () . 12 0 0 . 13 0??7S m / ] ??N d? 5 ?????????? 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S m / N d , R b / S r a n d u / Pr h / Pb sy s tema t ie s o r s r a n u Iite fa e ies roc k s fr o m F y te H i1ls , E n d e r b y ? n d , ^ n ta r e tica .N a tu r e,19 8 2,V o l.2 9 8 : 6 14 ? 6 18 .[5 ?F a u r e G . Pr in e ip le s o r Iso to Pe G e o lo s y , Zn d ?itio n . J o h n w i?e y & s o n s , N e w Y o r k , 19 8 6 .?6 ?R o llin s o n H . R . U s in g G e oc h e m ica l oa ta : E v a lu a t io ? , P re se n ta t io n , xn te rp r o ta tio n . Jo ? w ile y & s n os , N e w Y o r k?7?????? ? ??????? ? ? ?? : ????? , 1 0 8 5 ?R e v ie w o n the D iffe re n t M e thodo f D a tin g Ma fie?U ltr a m a fie R oc k s in19 9 3.thCO r o g e n ie B e lt? T a k in g th e S h u n e h a n g M a s if a s a n E x a m PleR e n S h e n g li(??, t~ t o f G eo ?g? a n d ?, a l Re s o ?, ce s , Ch zna Un z v , si t? o f G eo sczen ces , ????in g , 1 0 0 0 8 3 )S u n M in(De ?a , tm en t o f Ge o???, ?? ?? Ko , ? U o z ?, ?, , ???9 Ko n?)Li J ilia n g Z h o u X in h u a(Ins t : tu te o f Geo???, A c a d e m za S : n zca , Be :??n ? , 1 0 0 0 2 9 )A l, Str a C tB a se d o n th e a n a ly s is o f d iffe r e n t d a tin g m e thod so f iso to Pie s y ste m a n d th e d a tin g r es u ltso f th em e ta m o rp h ie m a fie? u ltr a m a fie r oc k s in S h u n eh a n g,N o rt he r n Fu jia n,itls pr o p ose d in the pa?r tha t th eU?P b m e thodo f s in g le z ire o n a n d th e m e thod o f the w h o le?r oc k S m?N d isoc h ro n ie a g e s h o u ld be ta ke na s th e m a in w a y s fo r d a tin g m e ta m o r Ph ie m a fie? u ltr a m a fie roc k s in the o ro g e n ie be lts.T h e d is eo v e r y o fy o u n se r a g e s d a tin s w ith th e R b?S r, 4 0A r? 3 9A r a n d K?A r m e thods s u g g e s ts tha t e a u tio n 15 w a r ra n te d inu s in g th e se iso to Pie s y s te m s to d a te m e ta m o rPh ie m a fie?u ltr a m a fie r oc k s.K e y w o rds: iso to Pie g e oc h r o no lo g y,m e ta m o rPh ie m a fie? u ltra m a fie roc k,S h u n eh a n g

造山带中镁铁一超镁铁岩的不同定年方法简评 -- 以闽北顺昌岩体为例

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Review on the different method of dating mafic-ultramafic rocks in the orogenic belt - taking the Shunchang massif as an example

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