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Larry Meinert Department of Geology Smith College Email ... - diabras

Larry Meinert Department of Geology Smith College Email ... - diabras

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Photos to accompany<br />

report on Bolivar<br />

skarn mineralogy<br />

<strong>Larry</strong> <strong>Meinert</strong><br />

<strong>Department</strong> <strong>of</strong> <strong>Geology</strong><br />

<strong>Smith</strong> <strong>College</strong><br />

<strong>Email</strong>: Lmeinert@smith.edu


Granodiorite porphyry<br />

Andesite


Granodiorite porphyry<br />

Andesite<br />

chlorite<br />

epidote<br />

DDH 28-60


wollastonite marble<br />

DDH 28-186 marble garnet<br />

vesuvianite


Irregular poikioblastic<br />

skarnoid garnet<br />

DDH 28-186 Clear metasomatic garnet rim


DDH 28-186 Bladed wollastonite


DDH 28-212 Bustamite<br />

Quartz-calcite-pyroxene<br />

wollastonite


DDH 28-218 Fibrous bustamite<br />

Metasomatic front


DDH 28-218 Fibrous bustamite<br />

Metasomatic front


DDH 28-218 wollastonite<br />

calcite


DDH 28-218 pyroxene<br />

Euhedral quartz<br />

calcite


Porphyritic andesite<br />

Biotite-altered phenocryst<br />

DDH 93-32 Pyroxene vein<br />

Pyroxene>garnet<br />

Kspar envelope<br />

garnet


Hydrothermal biotite<br />

DDH 93-32 Pyroxene vein<br />

Kspar envelope<br />

Porphyritic andesite


DDH 93-32 Pyroxene vein<br />

Kspar envelope


DDH 93-32 Hydrothermal biotite<br />

Hydrothermal kspar


Epidote<br />

DDH 93-35<br />

Epidote-chlorite-quartz-calcite-sphalerite<br />

Garnet-pyroxene


Host pyroxene<br />

DDH 93-35 Fluid inclusions with halite & chalcopyrite


DDH 93-35 sphalerite<br />

chlorite epidote


Uncrossed nicols<br />

DDH 93-35 epidote<br />

quartz<br />

Crossed nicols


DDH 93-35<br />

Vapor-rich<br />

inclusions<br />

Host epidote


granodiorite pyroxene<br />

DDH 93-89<br />

Red-brown garnet


DDH 93-35 Red-brown garnet<br />

pyroxene


sphalerite<br />

Vapor bubble<br />

halite<br />

sylvite<br />

DDH 93-35 chalcopyrite<br />

halite<br />

sylvite<br />

sphalerite<br />

Host pyroxene


Red-brown garnet<br />

Chilled, sheared contact zone<br />

DDH 93-92 Equigranular granodiorite


DDH 93-92 Equigranular granodiorite


DDH 93-92 Equigranular granodiorite<br />

Garnet skarn<br />

Chilled, sheared<br />

granodiorite


Garnet skarn<br />

DDH 93-92 Equigranular granodiorite


DDH 96-60<br />

Garnet-pyroxene-sphalerite vein<br />

Pyroxene skarn


DDH 96-60<br />

Pyroxene skarn


Uncrossed nicols Crossed nicols<br />

DDH 96-60 sphalerite garnet pyroxene<br />

Pyroxene skarn


DDH 96-60 Hydrothermal garnet<br />

Hydrothermal pyroxene


DDH 96-60<br />

Vapor bubble<br />

sylvite<br />

halite<br />

Pyroxene host


DDH96-60<br />

Vapor bubble<br />

chalcopyrite<br />

halite<br />

Pyroxene host


DDH 96-61<br />

Quartz-calcite-sphalerite-chalcopyrite veins<br />

Green garnet skarn<br />

Green garnet vein


DDH 96-61<br />

Uncrossed nicols Crossed nicols<br />

Early garnet<br />

Hydrothermal birefringent garnet


DDH 96-61<br />

Uncrossed nicols Birefringent garnet Crossed nicols


Uncrossed nicols Crossed nicols Reflected light<br />

DDH 96-61<br />

Cp<br />

Cp<br />

Sl Sl<br />

Sl<br />

Birefringent garnet<br />

Cp


Brown garnet<br />

Sphalerite-chalcopyrite<br />

DDH 96-76 Coarse-grained hydrothermal calcite


DDH 96-76<br />

Uncrossed nicols Crossed nicols<br />

calcite<br />

calcite<br />

Cp Cp


DDH 96-76<br />

Fluid inclusions in garnet


Chlorite-amphibole retrograde-altered garnet skarn<br />

DDH 96-88


DDH 96-88 Garnet remnants<br />

Chlorite


Amphibole<br />

DDH 96-88 Garnet remnant Chlorite


DDH 96-88<br />

Chlorite<br />

Fluid inclusion<br />

in quartz host


andesite<br />

DDH 96-101.5<br />

Chlorite alteration zone<br />

marble


“fresh” andesite<br />

DDH 96-101.5


andesite<br />

DDH 96-101.5<br />

Chlorite<br />

alteration<br />

zone<br />

marble


DDH 96-101.5<br />

chamosite<br />

chamosite


DDH 96-120 garnet<br />

chalcopyrite


Uncrossed nicols Crossed nicols Reflected light<br />

DDH 96-120<br />

Isotropic garnet<br />

Specular hematite<br />

cp cp cp


Equigranular granodiorite<br />

DDH 96-155 Quartz-chalcopyrite-chlorite-actinolite vein


Equigranular granodiorite Myrmekitic intergrowth<br />

DDH 96-155


Equigranular granodiorite<br />

DDH 96-155 chlorite<br />

actinolite<br />

cp


DDH 124-165 Olivine<br />

Magnetite


Uncrossed nicols Crossed nicols Reflected light<br />

mt<br />

DDH 124-165<br />

Olivine<br />

mt<br />

Pyroxene<br />

Bornite in chalcopyrite<br />

mt


Bornite<br />

mt<br />

DDH 124-165<br />

olivine<br />

Chalcopyrite<br />

mt<br />

Reflected light


Qtz-chl-cp-py vein<br />

DDH 124-256 Kspar-sericite envelope


Uncrossed nicols<br />

Crossed nicols<br />

DDH 124-256 Qtz-chl-cp-py vein Kspar-sericite envelope


chalcopyrite<br />

DDH 125-168 Garnet = pyroxene


Uncrossed nicols Crossed nicols Reflected light<br />

DDH 125-168<br />

cp<br />

Garnet chalcopyrite<br />

cp<br />

gar<br />

Pyroxene<br />

gar


DDH 125-168<br />

Fluid inclusions in pyroxene host<br />

with multiple daughter minerals


Mg skarn with olivine, pyroxene, clinohumite, vesuvianite<br />

DDH 125-172


Mg skarn with olivine, pyroxene, clinohumite, vesuvianite<br />

DDH 125-172


DDH 125-176 Biotite hornfels<br />

Pyx-kspar-ep


Uncrossed nicols<br />

py<br />

DDH 125-176<br />

Biotite<br />

Crossed nicols Reflected light<br />

pyrite chalcopyrite


Pyx-amph vein<br />

DDH 125-184 Chl-ep altered andesite


DDH 125-184<br />

Pyx-amph vein<br />

Chl-ep altered andesite


DDH 125-184 pyroxene<br />

amphibole

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