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1 8 Description of Mapped Units 113 ' 46 7.' Tac Anaconda Beds - sediments and volcaniclastics Kgd Kgd Hornblende, biotite granodiorite (Storm Lake stock) Tpg mq 48 Flathead quartzite - white to pink, quartzite Tbg 37 Tac Explanation of Map Symbols 77 Greenschist facies mylonite shear zone Normal fault 89 Metamorphic foliation w/ dip Upper-amphibolite facies ductile shear zone Low-angle normal detachment fault 21 Magmatic foliation w/ dip (The Lake of the Isle shear zone) 37 2 Tbg 16 mq Hasmark formation - white, coarse marble Silver Hill formation - mica schist 22 mtbg artz diorite (often sheared) Biotite granite (often mylonitic, some porphoritic) (Hearst Lake suite) 27 mtbg 7 Tbg Two-mica granite (often mylonitic) (Hearst Lake suite) Biotite granodiorite (some mylonitic) (Hearst Lake suite) m 6 YLb? tightly folded, attenuated Cambrian section Tpg Two-mica porphoritic granite 1 mylonitic calc-silicate 43 diabase sills Kgd YLb? m 18 Tap Aplite dike Dacitic dike Td m Kgd aternary undivided - moraines and alluvium Region not mapped 1 Migmatitic pelitic schist and gneiss 49 Thrust fault Antiform Helena formation - calc-silicate gneiss Vertical metamorphic foliation Metamorphic foliation w/ dip and trend of lineation Missoula Group - green calc-silicate and biotite quartzite gneisses Mesoscopic fold w/ trend of hinge Cleavage w/ dip Ravalli Group - biotite quartzite gneiss and schist Joint w/ dip Yg Greyson formation - grt+bt+sill schist and gneiss (locally migmatitic) YLb? mq mylonitic quartzite - white, mylonitic quartzite (Niehart or Flathead equivalent?) ORIGINAL MAP SCALE 1:200 Geologic map of the footwall of the Anaconda Metamorphic Core Complex, Northeastern Anaconda-Pintlar Range, Western Montana Geology by Warren C. Grice (surveyed in summer 04-0) with the exception of the Mt. Haggin area geology which is from mapping of Heise (1983) and Thomas J. Kalakay. Limited structural data and some unit contacts follow Emmons and Calkins (1913) and Lonn et al. (03). Base topography from USGS 1:200 scale Storm Lake, Mount Evans,and Mount Haggin 7. minute qradrangles. North km Contour interval is feet Map projection: 1927 NAD (North American Datum) Declinatin is 16 East References cited: (1) Emmons, W. H. and Calkins, F. C., 1913, Geology and ore deposits of the Phillipsburg quadrangle, Montana: U.S. Geological Survey Professional Paper 78, 271 p. (2) Heise, B. A., 1983, Structural geology of the Mt. Haggin area, Deer Lodge country, Montana. Unpublished Masters Thesis, University of Montana, Missoula, Montana, 77 p. (3) Lonn, J. D., McDonald, C., Lewis, R. S., Kalakay, T. J., O'Neill, J. M., Berg, R. B., and Hargrave, P., 03, Preliminary geologic map of the Philipsburg 'x ' quadrangle, western Montana: Montana Bureau of Mines and Geology Open file Report MBMG 483, scale: 1:,000.
2 DF biotite 3.7 ± 1.4 Ma DF02-1 biotite 76.3 ± 1.1 Ma 0 DF02-116a biotite 0 DF02-116a muscovite 39.6 ± 2.3 Ma. ± 2.0 Ma Total fusion age =.7 ± 0.7 Ma 0 0 DF02-118a biotite 1 SL- k-feldspar ± 1.6 Ma 6.9 ± 1.6 Ma Total fusion age =.1 ± 0.6 Ma 0 0 Ug-1 biotite 1 SL- hornblende ± 0.8 Ma 2. ± 12.8 Ma no plateau 0 0
3 WG04-02 biotite 64.1 ± 1.0 Ma WG biotite 48. ± 0.6 Ma 0 WG muscovite 0 WG biotite. ± 0.6 Ma 47.1 ± 0.7 Ma 0 WG04- muscovite 0 WG03-3 muscovite.4 ± 0.8 Ma 48.1± 0.6 Ma WG04-1 muscovite 0 WG04-1 biotite 49.6 ± 0.6 Ma 49.2 ± 0.9 Ma 0
4 WG04-9 biotite WG04-9 muscovite 47.6± 0.6 Ma 48.0 ± 0.6 Ma 0 WG muscovite 6.9 ± 0.7 Ma WG04-1 biotite WG04-1 muscovite ± 0.9 Ma 46.1 ± 0.6 Ma 0 0 ME-6 muscovite ME-6 biotite WG biotite 2.8 ± 0.7Ma 1. ± 1.2 Ma 48.6 ± 1.0 Ma 0 0
5 Data Repository: Table 1. Ar/39Ar data Temp. ( C) 36Ar(Ar) 37Ar(Ca) Ar(Cl) 39Ar(K) Ar(r) Calculated age Error in age Ar(r) 39Ar (K) or Laser (W) (Ma) (± 2 s.d.) % % SL biotite; J = W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± SL hornblende; J = C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± SL K-feldspar; J = C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± C ± WG04-1 biotite, J = W ± W ± W ± W ± W ± WG muscovite, J = W ±
6 0.42 W ± W ± W ± W ± WG04-02 biotite, J = W ± W ± W ± W ± W ± W ± W ± WG biotite, J = W ± W ± W ± W ± W ± W ± W ± WG04-9 biotite, J = W ± W ± W ± W ± W ± W ± W ± W ± WG04-1 biotite, J = W ± W ± W ± W ± W ± W ± W ± WG04-1 muscovite, J = W ± W ± W ± W ± W ± W ± W ± WG04- muscovite, J = W ± W ± W ± W ± W ± W ± W ± ME-6 muscovite, J = W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± UG-1 biotite, J = 0.009
7 0.11 W ± W ± W ± W ± W ± W ± W ± W ± WG04-3 muscovite, J = W ± W ± W ± W ± W ± W ± W ± WG biotite, J = W ± W ± W ± W ± W ± W ± WG muscovite, J = W ± W ± W ± W ± W ± W ± W ± WG04-1 muscovite, J = W ± W ± W ± W ± W ± W ± DF02-116a muscovite, J = W ± W ± W ± W ± W ± W ± W ± W ± W ± DF02-116a biotite, J = W ± W ± W ± W ± W ± W ± W ± W ± W ± DF02-116a biotite, J = W ± DF02-1 biotite, J = W ± DF02-118a biotite, J = W ± W ±
8 0.21 W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± DF02-118b biotite, J = W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± DF biotite, J = W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± W ± DF02-1 biotite, J = W ± W ± W ± W ± W ± W ± W ± W ± Ages calculated using GA biotite with an age of ± 0.96 Ma, and K decay constant of.43e- y-1 Correction factors for interfering neutron reactions were determined by analyzing K-glass and optical grade CaF2 with the following average values over several irradiations: ( Ar/ 39 Ar)K = 2.66 x -2, ( 36 Ar/ 37 Ar)Ca = 2. x -4, and ( 39 Ar/ 37 Ar)Ca = 6.76 x -4 Data corrected for line blanks determined by measurements at each temperature, discrimination calculated by measurements of atmospheric argon, and 37Ar and 39Ar decay.
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