Mineral name Structural Groups IMA Formula Max Age (Ma) Min Age (Ma) # of Sublocalities containing mineral LOCALITY IDs, not mindat ids # of localities containing mineral Actinolite (*) Amphibole Ca2 (Mg4.5-2.5 Fe2+ 0.5-2.5 )Si8 O22 (OH)2 1 120157 3419 Albite (*) Feldspar Na(AlSi3 O8 ) 309 281 2 119840 ,120157 8803 Allophane (*) Allophane Al2 O3 (SiO2 )1.3-2.0 ·2.5-3.0H2 O 2 119908 ,119909 470 Alum-(K) (*) Alum KAl(SO4 )2 ·12H2 O 1 120103 92 Analcime (*) Analcime Na(AlSi2 O6 )·H2 O 309 281 3 119840 ,120030 ,120082 1627 Anglesite (*) Baryte Pb(SO4 ) 252 174 17 119812 ,119842 ,119843 ,119847 ,119874 ,119940 ,119944 ,119946 ,119951 ,119973 ,119982 ,120056 ,120064 ,120100 ,120142 ,120147 ,120155 2734 Anhydrite (*) Not in a structural group Ca(SO4 ) 1 119819 1588 Anorthite (*) Feldspar Ca(Al2 Si2 O8 ) 309 281 2 119840 ,120157 1036 Aragonite (*) Aragonite Ca(CO3 ) 346.7 0 9 119804 ,119841 ,119925 ,119998 ,120015 ,120036 ,120049 ,120056 ,120072 3250 Arsenopyrite (*) Arsenopyrite FeAsS 2 119964 ,119980 9052 Ashoverite (*) None Zn(OH)2 0 0 1 119812 6 Augite (*) Pyroxene (Ca,Mg,Fe)2 Si2 O6 309 281 2 119840 ,120157 2060 Aurichalcite (*) None (Zn,Cu)5 (CO3 )2 (OH)6 16 119847 ,119887 ,119888 ,119944 ,119990 ,120019 ,120034 ,120043 ,120052 ,120053 ,120056 ,120069 ,120096 ,120100 ,120103 ,120130 919 Azurite (*) Not in a structural group Cu3 (CO3 )2 (OH)2 239 211 10 119842 ,119864 ,119868 ,120015 ,120032 ,120053 ,120060 ,120061 ,120100 ,120108 5509 Baryte (*) Baryte Ba(SO4 ) 346.7 211 87 119801 ,119803 ,119805 ,119809 ,119812 ,119814 ,119840 ,119841 ,119842 ,119846 ,119847 ,119859 ,119860 ,119862 ,119863 ,119864 ,119866 ,119868 ,119872 ,119885 ,119887 ,119893 ,119895 ,119898 ,119899 ,119900 ,119901 ,119909 ,119911 ,119912 ,119916 ,119917 ,119920 ,119922 ,119923 ,119924 ,119926 ,119927 ,119940 ,119941 ,119942 ,119943 ,119944 ,119946 ,119951 ,119960 ,119963 ,119965 ,119966 ,119968 ,119970 ,119975 ,119982 ,119986 ,119987 ,119989 ,120003 ,120010 ,120016 ,120019 ,120028 ,120042 ,120044 ,120053 ,120056 ,120063 ,120065 ,120067 ,120076 ,120086 ,120092 ,120100 ,120103 ,120104 ,120113 ,120124 ,120130 ,120131 ,120142 ,120143 ,120144 ,120145 ,120147 ,120149 ,120150 ,120153 ,120155 11547 Beidellite (*) Clay Smectite-vermiculite (Na,Ca)0.3 Al2 (Si,Al)4 O10 (OH)2 ·nH2 O 346.7 0 0 85 Bornite (*) None Cu5 FeS4 1 120047 5516 Brochantite (*) Brochantite Cu4 (SO4 )(OH)6 3 119842 ,120099 ,120100 1633 Calcite (*) Calcite Ca(CO3 ) 346.7 281 82 119800 ,119804 ,119812 ,119813 ,119816 ,119817 ,119838 ,119840 ,119842 ,119844 ,119846 ,119847 ,119860 ,119863 ,119864 ,119868 ,119884 ,119887 ,119895 ,119896 ,119900 ,119901 ,119909 ,119911 ,119912 ,119922 ,119923 ,119924 ,119925 ,119927 ,119930 ,119941 ,119944 ,119946 ,119951 ,119963 ,119965 ,119968 ,119970 ,119972 ,119980 ,119982 ,119985 ,119986 ,119989 ,119990 ,120002 ,120010 ,120016 ,120019 ,120024 ,120028 ,120032 ,120036 ,120040 ,120042 ,120045 ,120047 ,120049 ,120052 ,120053 ,120056 ,120066 ,120080 ,120086 ,120091 ,120092 ,120100 ,120102 ,120103 ,120104 ,120108 ,120113 ,120130 ,120131 ,120141 ,120142 ,120146 ,120147 ,120149 ,120150 ,120155 27770 Caledonite (*) Caledonite Cu2 Pb5 (SO4 )3 (CO3 )(OH)6 1 120100 359 Celadonite (*) Mica Clay KMgFe3+ Si4 O10 (OH)2 1 119925 309 Celestine (*) Baryte Sr(SO4 ) 1 119885 1252 Cerussite (*) Aragonite Pb(CO3 ) 252 174 50 119800 ,119801 ,119803 ,119804 ,119812 ,119821 ,119842 ,119847 ,119859 ,119872 ,119888 ,119890 ,119891 ,119896 ,119901 ,119912 ,119925 ,119927 ,119940 ,119941 ,119944 ,119950 ,119960 ,119964 ,119975 ,119982 ,119985 ,119986 ,119989 ,119992 ,120019 ,120028 ,120032 ,120044 ,120045 ,120049 ,120053 ,120054 ,120056 ,120076 ,120100 ,120103 ,120107 ,120111 ,120136 ,120142 ,120147 ,120148 ,120149 ,120155 4979 Chalcanthite (*) Chalcanthite Cu(SO4 )·5H2 O 2 119843 ,119951 925 Chalcocite (*) None Cu2 S 3 119927 ,120019 ,120100 5707 Chalcopyrite (*) Chalcopyrite CuFeS2 346.7 211 32 119800 ,119809 ,119816 ,119846 ,119847 ,119887 ,119895 ,119912 ,119913 ,119922 ,119923 ,119927 ,119931 ,119946 ,119948 ,119951 ,119964 ,119970 ,119972 ,119990 ,120019 ,120024 ,120036 ,120044 ,120047 ,120053 ,120056 ,120100 ,120103 ,120104 ,120128 ,120130 27198 Chamosite (*) Chlorite Clay (Fe2+ ,Mg,Al,Fe3+ )6 (Si,Al)4 O10 (OH,O)8 309 281 4 119840 ,119982 ,120103 ,120114 577 Chrysocolla (*) Allophane (Cu2-x Alx )H2-x Si2 O5 (OH)4 ·nH2 O 309 281 3 119840 ,119951 ,120043 3531 Chrysotile (*) Serpentine Clay Mg3 Si2 O5 (OH)4 309 281 3 119840 ,120024 ,120132 951 Cinnabar (*) None HgS 2 119800 ,120053 2600 Clinochlore (*) Chlorite Clay Mg5 Al(AlSi3 O10 )(OH)8 309 281 3 119840 ,120103 ,120157 1756 Copper (*) Copper Cu 3 119842 ,120039 ,120047 3846 Cuprite (*) Not in a structural group Cu2 O 3 119990 ,120015 ,120062 2970 Descloizite (*) Descloizite PbZn(VO4 )(OH) 1 120142 378 Digenite (*) Digenite Cu1.8 S 239 211 1 120032 1027 Dolomite (*) None CaMg(CO3 )2 346.7 211 14 119809 ,119872 ,119889 ,119909 ,119943 ,119951 ,119960 ,119978 ,120015 ,120016 ,120019 ,120044 ,120056 ,120151 9895 Dundasite (*) Dundasite PbAl2 (CO3 )2 (OH)4 ·H2 O 1 120103 97 Enargite (*) Enargite Wurtzite Cu3 AsS4 1 119816 910 Enstatite (*) Pyroxene Mg2 Si2 O6 309 281 1 119840 944 Ettringite (*) Ettringite Ca6 Al2 (SO4 )3 (OH)12 ·27H2 O 346.7 0 1 119812 93 Fluorite (*) Fluorite CaF2 252 174 98 119801 ,119804 ,119805 ,119808 ,119809 ,119812 ,119813 ,119814 ,119816 ,119841 ,119842 ,119844 ,119846 ,119847 ,119855 ,119859 ,119860 ,119862 ,119864 ,119868 ,119887 ,119893 ,119894 ,119895 ,119900 ,119901 ,119906 ,119909 ,119911 ,119912 ,119915 ,119916 ,119917 ,119919 ,119920 ,119922 ,119923 ,119924 ,119925 ,119926 ,119927 ,119929 ,119940 ,119941 ,119942 ,119943 ,119944 ,119946 ,119951 ,119955 ,119960 ,119963 ,119964 ,119965 ,119966 ,119968 ,119970 ,119972 ,119982 ,119983 ,119985 ,119986 ,119987 ,119988 ,119989 ,119990 ,119991 ,120005 ,120010 ,120016 ,120028 ,120032 ,120040 ,120041 ,120042 ,120043 ,120044 ,120045 ,120049 ,120052 ,120053 ,120054 ,120056 ,120071 ,120076 ,120086 ,120092 ,120103 ,120104 ,120106 ,120112 ,120113 ,120136 ,120143 ,120147 ,120149 ,120150 ,120161 9617 Galena (*) Rocksalt PbS 252 174 97 119800 ,119801 ,119803 ,119805 ,119809 ,119812 ,119813 ,119816 ,119817 ,119842 ,119843 ,119845 ,119846 ,119847 ,119848 ,119849 ,119859 ,119860 ,119862 ,119863 ,119864 ,119865 ,119868 ,119887 ,119891 ,119895 ,119897 ,119898 ,119899 ,119900 ,119901 ,119903 ,119904 ,119905 ,119906 ,119907 ,119909 ,119911 ,119912 ,119913 ,119920 ,119921 ,119922 ,119923 ,119924 ,119927 ,119929 ,119940 ,119941 ,119944 ,119946 ,119947 ,119962 ,119963 ,119964 ,119965 ,119966 ,119969 ,119970 ,119982 ,119986 ,119987 ,119989 ,119996 ,120008 ,120010 ,120011 ,120013 ,120016 ,120019 ,120028 ,120032 ,120040 ,120044 ,120045 ,120053 ,120054 ,120056 ,120076 ,120084 ,120088 ,120089 ,120092 ,120100 ,120103 ,120104 ,120130 ,120131 ,120138 ,120139 ,120142 ,120147 ,120148 ,120149 ,120150 ,120151 ,120155 24243 Gibbsite (*) None Al(OH)3 1 119873 504 Goethite (*) Diaspore FeO(OH) 346.7 211 25 119804 ,119809 ,119840 ,119841 ,119878 ,119879 ,119895 ,119901 ,119909 ,119912 ,119920 ,119922 ,119923 ,119927 ,119940 ,119979 ,120010 ,120044 ,120053 ,120056 ,120063 ,120080 ,120103 ,120106 ,120124 7437 Gold (*) Copper Au 309 281 1 119840 30554 Graphite (*) None C 1 120103 2812 Greenockite (*) Wurtzite CdS 346.7 211 7 119809 ,119812 ,119855 ,120032 ,120056 ,120103 ,120104 717 Gypsum (*) Gypsum Ca(SO4 )·2H2 O 346.7 211 16 119804 ,119809 ,119812 ,119819 ,119908 ,119909 ,119940 ,119941 ,119946 ,119967 ,119970 ,119989 ,120036 ,120044 ,120056 ,120104 6890 Hawleyite (*) Sphalerite CdS 346.7 0 1 119809 62 Hematite (*) Corundum Fe2 O3 346.7 211 25 119804 ,119838 ,119840 ,119841 ,119872 ,119912 ,119930 ,119940 ,119942 ,119951 ,119959 ,119960 ,119999 ,120001 ,120002 ,120003 ,120018 ,120044 ,120053 ,120065 ,120076 ,120122 ,120130 ,120131 ,120143 14640 Hemimorphite (*) Not in a structural group Zn4 (Si2 O7 )(OH)2 ·H2 O 239 211 27 119812 ,119842 ,119847 ,119944 ,119946 ,119965 ,119970 ,119989 ,120017 ,120019 ,120022 ,120032 ,120036 ,120038 ,120044 ,120045 ,120049 ,120053 ,120056 ,120068 ,120103 ,120104 ,120112 ,120142 ,120143 ,120147 ,120149 1689 Hercynite (*) Spinel Fe2+ Al2 O4 309 281 1 119840 407 Hydrocerussite (*) None Pb3 (CO3 )2 (OH)2 0 0 2 119812 ,120043 201 Hydrozincite (*) None Zn5 (CO3 )2 (OH)6 0 0 9 119809 ,119812 ,119946 ,120009 ,120019 ,120032 ,120043 ,120103 ,120104 1066 Jarosite (*) Alunite KFe3+ 3 (SO4 )2 (OH)6 346.7 0 0 2228 Kaolinite (*) Clay Kaolinite Al2 Si2 O5 (OH)4 2 119872 ,119999 5591 Lanarkite (*) None Pb2 O(SO4 ) 1 120142 97 Langite (*) None Cu4 (SO4 )(OH)6 ·2H2 O 1 120100 593 Leadhillite (*) None Pb4 (SO4 )(CO3 )2 (OH)2 239 211 4 120032 ,120044 ,120053 ,120142 265 Lepidocrocite (*) Lepidocrocite Fe3+ O(OH) 2 119850 ,120088 581 Linarite (*) Linarite CuPb(SO4 )(OH)2 239 211 4 120032 ,120052 ,120053 ,120100 987 Litharge (*) None PbO 252 174 2 119812 ,120103 139 Maghemite (*) Spinel (Fe3+ 0.67 0.33 )Fe3+ 2 O4 346.7 0 0 229 Magnetite (*) Spinel Fe2+ Fe3+ 2 O4 346.7 211 9 119804 ,119840 ,119908 ,120024 ,120032 ,120103 ,120133 ,120143 ,120157 14899 Malachite (*) Malachite Cu2 (CO3 )(OH)2 23 119842 ,119846 ,119847 ,119864 ,119868 ,119887 ,119888 ,119895 ,119912 ,119925 ,119946 ,119951 ,119990 ,120006 ,120032 ,120042 ,120053 ,120060 ,120061 ,120066 ,120100 ,120103 ,120130 12537 Marcasite (*) Marcasite FeS2 346.7 0 16 119804 ,119809 ,119901 ,119909 ,119927 ,119929 ,119951 ,119970 ,119975 ,119982 ,120056 ,120103 ,120106 ,120124 ,120150 ,120161 5674 Massicot (*) None PbO 346.7 0 1 119812 202 Matlockite (*) Matlockite PbClF 2 119944 ,119946 29 Mattheddleite (*) Apatite Pb5 (SiO4 )1.5 (SO4 )1.5 Cl 1 120142 32 Melanterite (*) Melanterite Fe(SO4 )·7H2 O 3 119892 ,119909 ,119957 915 Mercury (*) None Hg 1 120053 397 Microcline (*) Feldspar K(AlSi3 O8 ) 1 120157 4924 Millerite (*) Millerite NiS 346.7 0 2 119809 ,120128 1066 Mimetite (*) Apatite Pb5 (AsO4 )3 Cl 2 120077 ,120125 1107 Mogánite (*) None SiO2 ·n H2 O 1 119797 43 Montmorillonite (*) Clay Smectite-vermiculite (Na,Ca)0.3 (Al,Mg)2 Si4 O10 (OH)2 ·nH2 O 346.7 0 0 1508 Muscovite (*) Mica Clay KAl2 (Si3 Al)O10 (OH)2 3 119923 ,119927 ,120157 17380 Natrolite (*) Natrolite Na2 (Si3 Al2 )O10 ·2H2 O 309 281 1 119840 1236 Orthoclase (*) Feldspar K(AlSi3 O8 ) 1 120157 2349 Palygorskite (*) Palygorskite Clay (Mg,Al)2 Si4 O10 (OH)·4H2 O 0 0 1 119812 306 Paragonite (*) Mica Clay NaAl2 (Si3 Al)O10 (OH)2 1 120157 247 Phosgenite (*) None Pb2 (CO3 )Cl2 3 119944 ,119946 ,119954 142 Phosphohedyphane (*) Apatite Ca2 Pb3 (PO4 )3 Cl 1 120142 71 Pyrite (*) Pyrite FeS2 346.7 211 44 119800 ,119804 ,119809 ,119812 ,119813 ,119816 ,119821 ,119840 ,119842 ,119887 ,119894 ,119895 ,119896 ,119908 ,119922 ,119925 ,119927 ,119940 ,119941 ,119951 ,119963 ,119970 ,119980 ,119982 ,119986 ,119991 ,120040 ,120042 ,120044 ,120047 ,120048 ,120075 ,120076 ,120086 ,120103 ,120104 ,120122 ,120128 ,120130 ,120134 ,120150 ,120151 ,120152 ,120155 39462 Pyrolusite (*) Rutile MnO2 346.7 0 3 119809 ,119925 ,120062 3106 Pyromorphite (*) Apatite Pb5 (PO4 )3 Cl 346.7 0 20 119809 ,119821 ,119827 ,119841 ,119844 ,119872 ,119876 ,119888 ,119947 ,119961 ,119985 ,120019 ,120053 ,120056 ,120104 ,120135 ,120136 ,120143 ,120147 ,120149 1725 Pyrrhotite (*) Nickeline Fe7 S8 346.7 0 5 119804 ,119970 ,119985 ,120103 ,120127 9056 Quartz (*) Quartz SiO2 346.7 211 48 119797 ,119798 ,119800 ,119804 ,119809 ,119812 ,119816 ,119820 ,119823 ,119838 ,119840 ,119841 ,119847 ,119855 ,119860 ,119864 ,119868 ,119872 ,119882 ,119894 ,119895 ,119896 ,119906 ,119913 ,119920 ,119925 ,119968 ,119981 ,119982 ,119985 ,119987 ,119994 ,120018 ,120024 ,120031 ,120032 ,120041 ,120044 ,120045 ,120056 ,120065 ,120070 ,120076 ,120126 ,120133 ,120150 ,120157 ,120161 61156 Rhodochrosite (*) Calcite Mn(CO3 ) 309 281 2 119840 ,119975 1711 Rosasite (*) Malachite CuZn(CO3 )(OH)2 3 120034 ,120052 ,120053 454 Saponite (*) Clay Smectite-vermiculite (Ca,Na)0.3 (Mg,Fe)3 (Si,Al)4 O10 (OH)2 ·4H2 O 309 281 1 119840 301 Serpierite (*) Devilline Ca(Cu,Zn)4 (SO4 )2 (OH)6 ·3H2 O 1 120100 292 Siderite (*) Calcite Fe(CO3 ) 7 119872 ,119908 ,119913 ,119934 ,120036 ,120056 ,120098 6417 Sidpietersite (*) None Pb2+ 4 (S2 O3 )O2 (OH)2 346.7 0 1 119812 3 Silver (*) Copper Ag 1 120024 5186 Smithsonite (*) Calcite Zn(CO3 ) 239 211 29 119799 ,119805 ,119809 ,119812 ,119842 ,119844 ,119859 ,119921 ,119927 ,119941 ,119944 ,119946 ,119970 ,119982 ,120019 ,120032 ,120036 ,120038 ,120044 ,120045 ,120046 ,120049 ,120053 ,120056 ,120070 ,120103 ,120104 ,120149 ,120151 2473 Sphalerite (*) Sphalerite ZnS 252 174 34 119800 ,119809 ,119812 ,119813 ,119816 ,119845 ,119860 ,119863 ,119865 ,119909 ,119921 ,119923 ,119943 ,119944 ,119946 ,119963 ,119964 ,119967 ,119970 ,119972 ,119982 ,119990 ,120013 ,120016 ,120028 ,120045 ,120053 ,120076 ,120086 ,120103 ,120104 ,120130 ,120142 ,120155 21482 Sulphur (*) Sulphur S 252 174 14 119812 ,119842 ,119843 ,119852 ,119909 ,119929 ,119941 ,119944 ,119947 ,119951 ,120009 ,120103 ,120104 ,120151 2045 Sweetite (*) None Zn(OH)2 0 0 1 119812 4 Tenorite (*) None CuO 1 119990 1101 Tetrahedrite-(Zn) (*) Tetrahedrite Cu6 (Cu4 Zn2 )Sb4 S13 2 120103 ,120106 5317 Titanite (*) Titanite CaTi(SiO4 )O 346.7 0 0 4899 Torbernite (*) None Cu(UO2 )2 (PO4 )2 ·12H2 O 1 120104 1059 Uraninite (*) Fluorite UO2 1 119892 2718 Vanadinite (*) Apatite Pb5 (VO4 )3 Cl 1 120142 605 Vivianite (*) Vivianite Fe2+ 3 (PO4 )2 ·8H2 O 4 119887 ,119909 ,119927 ,119953 636 Weddellite (*) Oxalate Ca(C2 O4 )·2H2 O 0 0 2 119809 ,119812 32 Witherite (*) Aragonite Ba(CO3 ) 1 119863 251 Wulfenite (*) Scheelite PbMoO4 11 119842 ,119843 ,119896 ,119909 ,119924 ,119941 ,119970 ,119982 ,120100 ,120147 ,120149 1655 Wülfingite (*) Cristobalite Zn(OH)2 0 0 1 119812 5 Wurtzite (*) Wurtzite ZnS 346.7 0 3 119809 ,119816 ,120049 372 Zircon (*) Zircon Zr(SiO4 ) 309 281 2 119840 ,120157 5251
Excel ID Max Age (Ma) Min Age (Ma) Age as listed in reference Dating Method Age Interpret Prioritized? Sample Source Sample Num Run Num Age from other Locality Dated Mineral Minerals explicitely stated as having this age Age applies to these Elements MinDat Locality ID Dated Locality (Max Age) Location as listed in reference Reference Reference DOI Reference ID Age Notes Edit Michelle_551 0 0 Recent Age of weddellite mineralization high Weddellite 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Weddellite occurs due to the interaction of surface lichen and limestone/calcite. Edit Michelle_727 280 280 280 Uplift of Derbyshire Dome 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Uplift of Derbyshire Dome Edit Michelle_807 346.7 330.9 Visean Stratigraphy Age of Fallgate Volcanics 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Age of Fallgate Volcanics Edit Michelle_808 346.7 330.9 Visean Stratigraphy Age of Matlock Limestone 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Age of Matlock Limestone Edit Michelle_809 346.7 330.9 Visean Stratigraphy Age of Cawdor Limestone 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Age of Cawdor Limestone Edit Michelle_810 346.7 330.9 Visean Stratigraphy Age of Cawdor Shales 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Age of Cawdor Shales Edit Michelle_811 326 313 Namurian Stratigraphy Age of siltstone, mudstone and gritstone 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Age of siltstone, mudstone and gritstone Edit Michelle_812 252 174 Permo-Triassic, Early Jurassic Age of Mississippi Valley Type mineralization Anglesite, Cerussite, Fluorite, Galena, Litharge, Sphalerite, Sulphur 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Age of Mississippi Valley Type mineralization Edit Michelle_813 0 0 Anthropogenic Possibly anthropogenic high Ashoverite, Hemimorphite, Hydrocerussite, Hydrozincite, Palygorskite, Smithsonite, Sweetite, Wulfingite 1482 Milltown Quarry, Milltown, Ashover, Derbyshire, England, UK Milltown Quarry Rust (1991) UJMM10_14 Mineralization is likely of post-mining age due to the calcination of limestone interacting with zinc from vein mineralization. The reference suggests an anthropogenic origin for mineralization of the zinc hydroxide zone. Edit Lucy_092 309 281 295 ± 14 K/Ar Intruded through older (Lower Carboniferous) lavas. Olivines partly altered, otherwise fresh whole rock FM 26 1487 Calton Hill Quarry, Blackwell-in-the-Peak, Derbyshire, England, UK Calton Hill Quarry Fitch et al. (1964) 10.1144/GSL.SP.1964.001.01.16 GSL1_159 Intrusive into an older volcanic complex of Lower Carboniferous age. Edit Lucy_085 239 211 225 ± 14 K/Ar Extruded during Dibunophyllure Zone. Feldspars kaolinized, rock extensively chloritized whole rock FM 25 207106 Masson Hill And Mines, Matlock, Derbyshire, England, UK Masson Hill Fitch et al. (1964) 10.1144/GSL.SP.1964.001.01.15 GSL1_159 In the specimen analysed, the original ferro-magnesian minerals had been replaced by new chlorite and silica, and the plagioclase was somewhat kaolinized. The greater part of the previously accumulated radiogenic argon would have diffused from the rock during metasomatism and the age obtained is closely related to that of the mineralization (i.e., the formation of new chlorite) and not to that of extrusion.
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