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REP18451
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Last modified
8/24/2016 11:47:19 PM
Creation date
11/27/2007 2:24:01 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1977410
IBM Index Class Name
Report
Doc Date
3/29/1995
Doc Name
STRUCTURE MINERALIZATION & ALTERATION OF THE CROSS DEPOSIT
Media Type
D
Archive
No
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T-4518 56 <br />minerals inmost cases. <br />Sphalerite, galena, and chalcopyrite, in this order, are the most abundant minerals <br />in the base- and precious-metal stage. Electrum is the only minor mineral which clearly <br />belongs to this stage. All four minerals fill open space in coarse-grained quartz-pyrite: and <br />fractures and replace pyrite. Acanthite tray also be of this stage. Some tennantite, ~ <br />tetrahedrite, famatirtite and stromeyerite may belong to this stage as well, but they <br />normally appeaz to belong to the later sulfosalt stage. <br />Minor eazly chalcopyrite was the First mineral to be deposited. It lines quartz vugs <br />as coatings with thicknesses of less than 20 µm (Fig. 34a). The remaining vug is filled <br />with sphalerite or a later chalcopyrite stage. Galena does not occur in contact with this <br />first stage of chalcopyrite. <br />Anhedral to euhedral sphalerite (100 µm to 1 cm) was deposited next (Fig. 3410. <br />It is primarily dark green and contains abundant chalcopyrite blebs less than 1 µm in <br />diameter (Fig. 35a). Light sphalerite, which is usually surrounded by dark green sphal~:rite <br />(Fig. 356), contains fewer but lazger (5-50 µm) chalcopyrite blebs (Fig. 35c). ,~ <br />f <br />Cleaz sphalerite which lacks chalcopyrite blebs occtus in narrow (2-3 µm), elongate zones ~- <br />r <br />in dark green sphalerite (Fig. 356) and as larger patches adjacent to dark green sphalerite ~ . <br />(Fig. 35~. Al] of these textures, called watermelon, dusted, and bimodal by Barton and <br />Bethke (1987), result from replacement of sphalerite by chalcopyrite. Watermelon texture <br />is characterized by a rind of dark sphaletite with fine (1 µm) chalcopyrite enclosing a come <br />of colorless sphaletite (absent in Cross sphalerite) and a center with larger seeds of <br />
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