Mineral Evolution Database
Created and maintained by the Mineral Evolution Project in partnership with RRUFF and mindat.
Mineral locality data provided by mindat.org



The Mineral Evolution database is currently under development.

The goal of this page is to present localities at which the mineral is found, and estimates of the oldest possible geologic age of the minerals at these localities.


Locality Name:
Buller District, West Coast Region, New Zealand

Oldest recorded age at locality: 503
Youngest recorded age at locality: 50

mindat Locality ID: 298485
mindat URL: http://www.mindat.org/loc-298485.html

Tectonic Settings:

Total number of sublocalities beneath "Buller District, West Coast Region, New Zealand": 95
Total number of bottom-level sublocalities: 84

Number of Child Localities: 9
Child Localities:
Charleston
Denniston
Karamea
Lyell
Reefton
Seddonville
Springs Junction
Stockton
Westport

Latitude: 41°48'38"S
Longitude: 171°56'31"E
Decimal Degree (lat, lon): -41.810555555556,171.94194444444

AThis mineral is Anthropogenic.
GThis mineral is directly dated.
BThis mineral is reported as having this age.
YThis mineral is using an age reported as an element mineralization period.
OThis mineral is using an age calculated from all data at the locality.
RThe age displayed for this mineral originates from a different, non-child locality.
PThe age displayed for this mineral is the range of ages for this mineral at all of this locality's children.
This mineral's age has not yet been recorded.

This Mineral list contains entries from this locality, including sub-localities. Minerals in bold are reported by mindat.org as occurring directly at this locality, and do not occur at any children (sublocalities) of this locality.

Elements at this locality, including sub-localities: Ag Al As Au Ba Be Bi C Ca Cu F Fe H K Mg Mo Na O P Pb S Sb Si Sn Ti U V W Zn Zr 

Elements from minerals reported directly at this locality: 

Structural Groups for minerals in this locality: 
AcanthiteAndalusiteApatiteArsenicArsenoliteArsenopyriteAutuniteBaryteBerylCalcite
ChalcopyriteChalcostibiteChloriteChloritoidClayClinozoisiteCopperCorundumCovelliteCubanite
DevillineEpidoteFeldsparFluoriteGarnetKaoliniteLöllingiteMarcasiteMeneghiniteMeta-autunite
MicaMolybdeniteNickelineNoneNot in a structural groupPyriteQuartzRocksaltRutileScheelite
SchoepiteSphaleriteSpinelStibniteTetrahedriteTitaniteTopazTungstiteVivianiteWurtzite
ZippeiteZircon

78 IMA Minerals at location:
Acanthite  (*)Aikinite  (*)Albite  (*)Anatase  (*)Andalusite  (*)
Andradite  (*)Ankerite  (*)Arsenolite  (*)Arsenopyrite  (*)Autunite  (*)
Azurite  (*)Baryte  (*)Becquerelite  (*)Beryl  (*)Bismuth  (*)
Bismuthinite  (*)Bornite  (*)Calcite  (*)Cassiterite  (*)Chalcocite  (*)
Chalcopyrite  (*)Chloritoid  (*)Claudetite  (*)Clinochlore  (*)Clinozoisite  (*)
Coffinite  (*)Cordierite  (*)Covellite  (*)Cubanite  (*)Cuprite  (*)
Dolomite  (*)Emplectite  (*)Epidote  (*)Fluorapatite  (*)Fluorite  (*)
Galena  (*)Gold  (*)Graphite  (*)Hematite  (*)Kaolinite  (*)
Löllingite  (*)Magnesite  (*)Magnetite  (*)Marcasite  (*)Meta-autunite  (*)
Metatorbernite  (*)Microcline  (*)Molybdenite  (*)Muscovite  (*)Natrozippeite  (*)
Orthoclase  (*)Phlogopite  (*)Pyrite  (*)Pyrrhotite  (*)Quartz  (*)
Rutherfordine  (*)Rutile  (*)Saléeite  (*)Scheelite  (*)Schoepite  (*)
Scorodite  (*)Serpierite  (*)Siderite  (*)Sklodowskite  (*)Sphalerite  (*)
Stibnite  (*)Tennantite-(Fe)  (*)Tetrahedrite-(Zn)  (*)Titanite  (*)Topaz  (*)
Torbernite  (*)Tripuhyite  (*)Tungstite  (*)Tyuyamunite  (*)Uraninite  (*)
Uranophane-α  (*)Vivianite  (*)Zircon  (*)
Mineral nameStructural GroupsIMA FormulaMax Age (Ma)Min Age (Ma)# of Sublocalities containing mineralLOCALITY IDs, not mindat ids# of localities containing mineral
Acanthite  (*)AcanthiteAg2S1886002793
Aikinite  (*)MeneghiniteCuPbBiS3188554315
Albite  (*)FeldsparNa(AlSi3O8)588554,88558,88567,88571,886008803
Anatase  (*)Not in a structural groupTiO2109.1801886312162
Andalusite  (*)AndalusiteAl2SiO51885441310
Andradite  (*)GarnetCa3Fe3+2(SiO4)31886161534
Ankerite  (*)NoneCa(Fe2+,Mg)(CO3)2109.180588567,88573,88584,88606,886313092
Arsenolite  (*)ArsenoliteAs2O3288573,88606231
Arsenopyrite  (*)ArsenopyriteFeAsS888567,88570,88573,88584,88597,88598,88606,886119052
Autunite  (*)AutuniteCa(UO2)2(PO4)2·10-12H2O109.1801886311272
Azurite  (*)Not in a structural groupCu3(CO3)2(OH)21885555509
Baryte  (*)BaryteBa(SO4)100.5100.318863311547
Becquerelite  (*)NoneCa(UO2)6O4(OH)6·8H2O109.18018863192
Beryl  (*)BerylBe3Al2Si6O181885394286
Bismuth  (*)ArsenicBi488557,88567,88571,886001966
Bismuthinite  (*)StibniteBi2S3288558,885611935
Bornite  (*)NoneCu5FeS4588544,88555,88571,88597,886005516
Calcite  (*)CalciteCa(CO3)109.180488573,88584,88597,8863127770
Cassiterite  (*)RutileSnO2488544,88571,88597,886005171
Chalcocite  (*)NoneCu2S388555,88573,886005707
Chalcopyrite  (*)ChalcopyriteCuFeS2109.1801588544,88554,88555,88556,88557,88558,88561,88571,88572,88573,88597,88600,88606,88613,8863127198
Chloritoid  (*)ChloritoidFe2+Al2O(SiO4)(OH)2188610376
Claudetite  (*)NoneAs2O318860635
Clinochlore  (*)Chlorite ClayMg5Al(AlSi3O10)(OH)81885841756
Clinozoisite  (*)Clinozoisite EpidoteCa2Al3[Si2O7][SiO4]O(OH)1885971025
Coffinite  (*)ZirconU(SiO4)·nH2O109.180188631566
Cordierite  (*)BerylMg2Al4Si5O181886001008
Covellite  (*)CovelliteCuS588544,88555,88571,88597,886004165
Cubanite  (*)Cubanite WurtziteCuFe2S3288554,88558802
Cuprite  (*)Not in a structural groupCu2O1885552970
Dolomite  (*)NoneCaMg(CO3)2109.180488567,88573,88606,886319895
Emplectite  (*)ChalcostibiteCuBiS2188555246
Epidote  (*)Epidote ClinozoisiteCa2(Al2Fe3+)[Si2O7][SiO4]O(OH)288558,885718173
Fluorapatite  (*)ApatiteCa5(PO4)3F111.899.31885672740
Fluorite  (*)FluoriteCaF2109.180388571,88597,886319617
Galena  (*)RocksaltPbS788554,88556,88557,88573,88576,88591,8860624243
Gold  (*)CopperAu4188540,88543,88560,88562,88563,88564,88565,88568,88570,88571,88572,88573,88576,88577,88579,88582,88583,88584,88585,88587,88588,88589,88590,88591,88592,88594,88595,88596,88597,88598,88606,88607,88608,88609,88611,88612,88613,88615,88617,88618,8862530554
Graphite  (*)NoneC111.899.31885672812
Hematite  (*)CorundumFe2O3488544,88558,88571,8859714640
Kaolinite  (*)Clay KaoliniteAl2Si2O5(OH)41886005591
Löllingite  (*)LöllingiteFeAs2188597762
Magnesite  (*)CalciteMg(CO3)388567,88573,886061487
Magnetite  (*)SpinelFe2+Fe3+2O4488554,88556,88557,8855814899
Marcasite  (*)MarcasiteFeS2388571,88573,886005674
Meta-autunite  (*)Meta-autuniteCa(UO2)2(PO4)2·6H2O109.180188631388
Metatorbernite  (*)NoneCu(UO2)2(PO4)2·8H2O109.180288555,88631443
Microcline  (*)FeldsparK(AlSi3O8)288571,886004924
Molybdenite  (*)MolybdeniteMoS21388554,88555,88556,88557,88558,88561,88571,88572,88573,88597,88600,88606,886135800
Muscovite  (*)Mica ClayKAl2(Si3Al)O10(OH)2100.598.91088544,88554,88556,88558,88561,88567,88571,88573,88597,8860017380
Natrozippeite  (*)ZippeiteNa5(UO2)8(SO4)4O5(OH)3·12H2O109.18018863141
Orthoclase  (*)FeldsparK(AlSi3O8)9881388554,88556,885972349
Phlogopite  (*)Mica ClayKMg3(AlSi3O10)(OH)21885972273
Pyrite  (*)PyriteFeS2109.1801888544,88555,88556,88557,88558,88561,88567,88570,88571,88573,88583,88584,88596,88597,88598,88600,88606,8863139462
Pyrrhotite  (*)NickelineFe7S8688554,88556,88557,88558,88573,885979056
Quartz  (*)QuartzSiO22488539,88554,88556,88558,88561,88567,88570,88571,88572,88573,88576,88583,88584,88590,88591,88596,88597,88598,88600,88606,88611,88613,88618,8862561156
Rutherfordine  (*)None(UO2)(CO3)109.18018863158
Rutile  (*)RutileTiO2288558,885735614
Saléeite  (*)NoneMg(UO2)2(PO4)2(H2O)10109.18018863195
Scheelite  (*)ScheeliteCa(WO4)288571,885974894
Schoepite  (*)Schoepite(UO2)4O(OH)6(H2O)6109.18018863194
Scorodite  (*)NoneFe3+(AsO4)·2H2O288573,886061153
Serpierite  (*)DevillineCa(Cu,Zn)4(SO4)2(OH)6·3H2O109.180188631292
Siderite  (*)CalciteFe(CO3)488567,88573,88583,886066417
Sklodowskite  (*)NoneMg(UO2)2(SiO3OH)2·6H2O109.18018863156
Sphalerite  (*)SphaleriteZnS888554,88556,88557,88558,88573,88597,88600,8860621482
Stibnite  (*)StibniteSb2S3788573,88584,88590,88596,88606,88613,886183418
Tennantite-(Fe)  (*)TetrahedriteCu6(Cu4Fe2)As4S131885541803
Tetrahedrite-(Zn)  (*)TetrahedriteCu6(Cu4Zn2)Sb4S131885555317
Titanite  (*)TitaniteCaTi(SiO4)O111.899.31885674899
Topaz  (*)TopazAl2SiO4F2288571,886001476
Torbernite  (*)NoneCu(UO2)2(PO4)2·12H2O109.1801886311059
Tripuhyite  (*)RutileFe3+Sb5+O418858466
Tungstite  (*)TungstiteWO3·H2O188597118
Tyuyamunite  (*)NoneCa(UO2)2(VO4)2·5-8H2O109.180188631628
Uraninite  (*)FluoriteUO2109.1801886312718
Uranophane-α  (*)NoneCa(UO2)2(SiO3OH)2·5H2O109.180188631890
Vivianite  (*)VivianiteFe2+3(PO4)2·8H2O188573636
Zircon  (*)ZirconZr(SiO4)109.180388567,88571,886315251



40 Ages assigned to this locality:

Excel IDMax Age (Ma)Min Age (Ma)Age as listed in referenceDating MethodAge InterpretPrioritized?Sample SourceSample NumRun NumAge from other LocalityDated MineralMinerals explicitely stated as having this ageAge applies to these ElementsMinDat Locality IDDated Locality (Max Age)Location as listed in referenceReferenceReference DOIReference IDAge Notes
Giersdorf_00000759100.598.999.7±0.8K-Ar highmuscoviteBKG-2  MuscoviteMuscovite 15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Integrated K-Ar age is best estimate for closure of th argon system in this mineral
Giersdorf_00000760997799-77K-Ar lowbiotiteBKG-2    15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired from initial gas readings and is disregarded as it is inconsistent with the remaining findings
Giersdorf_00000761100100100K-Ar biotiteBKG-2    15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired from the remaining gas readings and are viewed as more accurate
Giersdorf_0000076299.799.199.4±0.3K-Ar biotiteBKG-2    15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Total Gas Age
Giersdorf_00000763101.199.3100.2±0.9K-Ar highbiotiteBKG-2    15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Integrated Gas Age
Giersdorf_0000076419568195-68K-Ar loworthoclaseBKG-2  OrthoclaseOrthoclase 15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired from when only 2% gas was released and is disregarded due to being highly inconsistent with remaining findings
Giersdorf_00000765969496-94K-Ar orthoclaseBKG-2  OrthoclaseOrthoclase 15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Summary of remaining gas ages given, before analysis
Giersdorf_00000766989898K-Ar orthoclaseBKG-2  OrthoclaseOrthoclase 15482Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired from the final reading of the sample in question
Giersdorf_00000745127.1122.9125±2.1K-ArThe age of ~110 Ma records amphibolite facies metamorphism and the beginning of recorded thermal history. This was followed by a period of rapid cooling until ~90 Ma when cooling rates decreased sharply, suggesting an initial period of unroofing followed hornblendePSG-11    296719Giles Creek Mine, Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Integrated K-Ar age
Giersdorf_00000746107.6104.6106.1±1.5K-ArThe age of ~110 Ma records amphibolite facies metamorphism and the beginning of recorded thermal history. This was followed by a period of rapid cooling until ~90 Ma when cooling rates decreased sharply, suggesting an initial period of unroofing followed hornblendePSG-11    296719Giles Creek Mine, Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Isochron K-Ar age
Giersdorf_0000074798.597.998.2±0.3K-ArThe age of ~110 Ma records amphibolite facies metamorphism and the beginning of recorded thermal history. This was followed by a period of rapid cooling until ~90 Ma when cooling rates decreased sharply, suggesting an initial period of unroofing followed muscovitePSG-14  MuscoviteMuscovite 296719Giles Creek Mine, Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Integrated K-Ar age
Giersdorf_0000074898.297.297.7±0.5K-ArThe age of ~110 Ma records amphibolite facies metamorphism and the beginning of recorded thermal history. This was followed by a period of rapid cooling until ~90 Ma when cooling rates decreased sharply, suggesting an initial period of unroofing followed muscovitePSG-14  MuscoviteMuscovite 296719Giles Creek Mine, Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Isochron K-Ar age
Giersdorf_00000749908190-81K-ArThe age spectrum provided by the K-feldspar in the sample is indicative of a rapid coolingorthoclasePSG-14  OrthoclaseOrthoclase 296719Giles Creek Mine, Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age spectrum for K-feldspar
Giersdorf_0000075715095150-95K-Ar lowhornblendeSGD-4    296719Giles Creek Mine, Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age is extracted from the first 15% of the gas released and inconsistent with the result that the remaining 85% of the gas produced.
Giersdorf_00000758111.8109.6110.7±1.1K-Ar highhornblendeSGD-4    296719Giles Creek Mine, Reefton, Buller District, West Coast Region, New ZealandReefton DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Isochron K-Ar age age is best estimate for closure of th argon system in this mineral
Giersdorf_00000750114114114K-ArData suggests that the Foulwind Granite was intruded and remained at depths of 14-18 km and temperature of >600 C until Cretaceous unroofing when hornblende, biotite, and K-feldspar closed. Alternatively, the thermal history could just reflect Cretaceous hornblendeFW-4    297120Westport, Buller District, West Coast Region, New ZealandBuller DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Integrated K-Ar age
Giersdorf_00000751112110112-110K-ArData suggests that the Foulwind Granite was intruded and remained at depths of 14-18 km and temperature of >600 C until Cretaceous unroofing when hornblende, biotite, and K-feldspar closed. Alternatively, the thermal history could just reflect Cretaceous hornblendeFW-4    297120Westport, Buller District, West Coast Region, New ZealandBuller DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired during the heating process, referenced by the above to attest to the 114 Ma age's accuracy, plateau segment from ~1-81% gas released
Giersdorf_00000752110108109±1K-ArData suggests that the Foulwind Granite was intruded and remained at depths of 14-18 km and temperature of >600 C until Cretaceous unroofing when hornblende, biotite, and K-feldspar closed. Alternatively, the thermal history could just reflect Cretaceous highhornblendeFW-4    297120Westport, Buller District, West Coast Region, New ZealandBuller DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Isochron K-Ar age is best estimate for closure of th argon system in this mineral
Giersdorf_00000753100100100K-ArData suggests that the Foulwind Granite was intruded and remained at depths of 14-18 km and temperature of >600 C until Cretaceous unroofing when hornblende, biotite, and K-feldspar closed. Alternatively, the thermal history could just reflect Cretaceous biotiteFW-4    297120Westport, Buller District, West Coast Region, New ZealandBuller DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired during the heating process, with 90% of the emitted gas creating this result.
Giersdorf_00000754102.2100101.1±1.1K-ArData suggests that the Foulwind Granite was intruded and remained at depths of 14-18 km and temperature of >600 C until Cretaceous unroofing when hornblende, biotite, and K-feldspar closed. Alternatively, the thermal history could just reflect Cretaceous biotiteFW-4    297120Westport, Buller District, West Coast Region, New ZealandBuller DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Isochron K-Ar age
Giersdorf_00000755979797K-ArData suggests that the Foulwind Granite was intruded and remained at depths of 14-18 km and temperature of >600 C until Cretaceous unroofing when hornblende, biotite, and K-feldspar closed. Alternatively, the thermal history could just reflect Cretaceous orthoclaseFW-4  OrthoclaseOrthoclase 297120Westport, Buller District, West Coast Region, New ZealandBuller DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired during the heating process, interpreted by the author to be the only age of geological significance, as the author noted an excess of argon in the sample
Giersdorf_00000756145140145-140K-ArData suggests that the Foulwind Granite was intruded and remained at depths of 14-18 km and temperature of >600 C until Cretaceous unroofing when hornblende, biotite, and K-feldspar closed. Alternatively, the thermal history could just reflect Cretaceous loworthoclaseFW-4  OrthoclaseOrthoclase 297120Westport, Buller District, West Coast Region, New ZealandBuller DistrictSpell et al. (2000)10.1029/1999TC900046T19_433Age is disregarded due to the belief that it is caused by an excess of argon
Giersdorf_00000778109109109K-Ar muscoviteHCB(t)-1  MuscoviteMuscovite 15243Hawks Crag, Westport, Buller District, West Coast Region, New ZealandHawks CragSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired from 92% of the results during the experimentation
Giersdorf_00000779109.1108.7108.9±0.2K-Ar highmuscoviteHCB(t)-1  MuscoviteMuscovite 15243Hawks Crag, Westport, Buller District, West Coast Region, New ZealandHawks CragSpell et al. (2000)10.1029/1999TC900046T19_433Total gas age
Giersdorf_00000780968096-80K-Ar orthoclaseHCB(t)-1  OrthoclaseOrthoclase 15243Hawks Crag, Westport, Buller District, West Coast Region, New ZealandHawks CragSpell et al. (2000)10.1029/1999TC900046T19_433Age yielded from the sampling of the first 10% of the emitted gas
Giersdorf_00000781999699-96K-Ar orthoclaseHCB(t)-1  OrthoclaseOrthoclase 15243Hawks Crag, Westport, Buller District, West Coast Region, New ZealandHawks CragSpell et al. (2000)10.1029/1999TC900046T19_433Age yielded from the remaining 90% of the gas in comparison to the above entry
Giersdorf_0000078296.696.296.4±0.2K-Ar highorthoclaseHCB(t)-1  OrthoclaseOrthoclase 15243Hawks Crag, Westport, Buller District, West Coast Region, New ZealandHawks CragSpell et al. (2000)10.1029/1999TC900046T19_433Total gas age
Giersdorf_00000783103103103K-Ar muscoviteHCB(b)-3  MuscoviteMuscovite 15243Hawks Crag, Westport, Buller District, West Coast Region, New ZealandHawks CragSpell et al. (2000)10.1029/1999TC900046T19_433Slightly younger age that is disregarded due to the remaining samples all lining up with the age of 108
Giersdorf_00000784108.3107.7108±0.3K-Ar highmuscoviteHCB(b)-3  MuscoviteMuscovite 15243Hawks Crag, Westport, Buller District, West Coast Region, New ZealandHawks CragSpell et al. (2000)10.1029/1999TC900046T19_433Total gas age
Giersdorf_00000767102.5102.5102.5K-Ar muscoviteRQD-1  MuscoviteMuscovite 15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Age acquired through 98% of the gas extraction
Giersdorf_00000768102.5102.1102.3±0.2K-Ar highmuscoviteRQD-1  MuscoviteMuscovite 15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Total Gas Age, taken as the best result for the sample
Giersdorf_00000769818181K-Ar lowbiotiteRQD-1    15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Initial age acquired during the gas release process, regarded as inconsistent
Giersdorf_00000770100100100K-Ar biotiteRQD-1    15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Age summarization acquired during the remainder of the gas release process
Giersdorf_00000771100.399.399.8±0.5K-Ar biotiteRQD-1    15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Total gas age
Giersdorf_00000772100.5100.3100.4±0.1K-Ar highbiotiteRQD-1    15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Plateau segment of the age plot used as the best age for the sample
Giersdorf_00000773503138503-138K-Ar loworthoclaseRQD-1  OrthoclaseOrthoclase 15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Initial age acquired during the gas release process, regarded as inconsistent
Giersdorf_00000774905090-50K-Ar loworthoclaseRQD-1  OrthoclaseOrthoclase 15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Apparent age range from the sample throughout the degassing process
Giersdorf_00000775979797K-Ar orthoclaseRQD-1  OrthoclaseOrthoclase 15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Age to which most of the remaining ages rose to during the testing process
Giersdorf_00000776979097-90K-Ar highorthoclaseRQD-1  OrthoclaseOrthoclase 15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_43390% of the age tests yielded ages within this range for the sample
Giersdorf_00000777939393K-Ar orthoclaseRQD-1  OrthoclaseOrthoclase 15355Mispickel Creek, Westport, Buller District, West Coast Region, New ZealandWestportSpell et al. (2000)10.1029/1999TC900046T19_433Total gas age


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All locality data graciously provided by mindat.org

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