trilobite Isotelus gigas
Trenton Black River Project
Petrography
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PETROGRAPHY OF THE TRENTON AND BLACK RIVER GROUP CARBONATE ROCKS IN THE APPALACHIAN BASIN

Introduction | Methods | Constituents | Microfacies and Depositional Environments | Diagenesis | Dolomite Textures, Diagenesis, and Porosity |
References | Text Figures | Appendix I [Skeletal (PDF) - Nonskeletal (PDF)] | Appendix II (PDF) |
Appendix III-Figure Captions | Appendix IV-Figure Captions | Appendix V-Figure Captions |
Table 1 - TBR Core and Outcrop Samples (PDF)

FIGURES AND APPENDICIES:

Appendix 4 Figure Captions.

(Click on thumbnail image for an expanded view.)

Base metal sulfide mineralization.

Figure A4-1.
FIGURE A4-1. Late-stage calcite replacing nonplanar (saddle) dolomite. Note the abundant pyrite associated with the calcite and dolomite. OH3267 core, Strayer #1 well, Allen County, OH, 1230.3 ft.

Late-stage calcite replacing nonplanar (saddle) dolomite. Note the abundant pyrite associated with the calcite and dolomite. OH3267 core, Strayer #1 well, Allen County, OH, 1230.3 ft.

Figure A4-2.
FIGURE A4-2A. Calcite replacing nonplanar (saddle) dolomite. A. Calcite replacing nonplanar (saddle) dolomite. Although the large, almost white crystal on the right side of the SEM photo exhibits the characteristic morphology of saddle dolomite, it's lighter color in the backscattered electron mode means that it's composition is different than the adjacent saddle dolomites in the picture. The EDS spectrum shown in B shows calcium excess in the crystal. Trenton Formation, OH 3479, Anderson well, Hancock Co., OH, 1337.8 ft.
FIGURE A4-2 B. EDS spectra of the crystal shown in A. B. EDS spectra of the crystal shown in A.
Figure A4-3.
FIGURE A4-3. Authigenic quartz replacing anhydrite in the Trenton Formation, northwest Ohio. Authigenic quartz replacing anhydrite in the Trenton Formation, northwest Ohio.
Figure A4-4.
FIGURE A4-4. Anhydrite and quartz replace nonplanar (saddle) dolomite and fill a large vug in the Trenton Formation in the subsurface of northwestern Ohio. Anhydrite and quartz replace nonplanar (saddle) dolomite and fill a large vug in the Trenton Formation in the subsurface of northwestern Ohio.
Figure A4-5.
FIGURE A4-5. Authigenic quartz partially filling a small vug in the Black River Formation, Gray #1 well, Steuben County, NY, 7803 ft. Authigenic quartz partially filling a small vug in the Black River Formation, Gray #1 well, Steuben County, NY, 7803 ft.
Figure A4-6.

Supergene mineralization in the Black River Formation in the subsurface of south-central NY. Gray #1 well, 7799.9 ft., Steuben County.

FIGURE A4-6A. Bitumen coats a crystal of delafossite, a copper-iron oxide that commonly occurs as a secondary mineral near the base of the oxidized zone of copper deposits. A. Bitumen coats a crystal of delafossite, a copper-iron oxide that commonly occurs as a secondary mineral near the base of the oxidized zone of copper deposits. Black crystals of delafossite fill many small vugs in the Grey well core (it appears white in this backscattered electron photomicrograph due to the high atomic number of the copper and iron).
FIGURE A4-6B. The location of EDS analysis in this sample and the EDS spectra for the white mineral.
FIGURE A4-6C. The location of EDS analysis in this sample and the EDS spectra for the white mineral. 		B. and C. show the location of EDS analysis in this sample and the EDS spectra for the white mineral.
Figure A4-7.
FIGURE A4-7. Nonplanar (saddle dolomite fills this small vug in the Black River Formation (Gray #1 well, Steuben County, NY, 7803 ft.). White specks throughout the SEM photo are anhydrite. Nonplanar (saddle dolomite fills this small vug in the Black River Formation (Gray #1 well, Steuben County, NY, 7803 ft.). White specks throughout the SEM photo are anhydrite.
Figure A4-8.
FIGURE A4-8. Opal partially fills a small vug in peloidal limestone in the Black River Formation in the subsurface of north central Pennsylvania. Opal partially fills a small vug in peloidal limestone in the Black River Formation in the subsurface of north central Pennsylvania. This sample is from a zone about 70 ft. above an extensively dolomitized section in the well. Identification of the white mineral as opal is based on its isotropic behavior under crossed polars and its index of refraction less than epoxy. Bayles #1 well, Bradford County, Pa, 12,300 ft.
Figure A4-9.
FIGURE A4-9. Bitumen filling intercrystalline pore space in dolostone, Grey #1 well, Steuben County, NY, 7803 ft. Bitumen filling intercrystalline pore space in dolostone, Grey #1 well, Steuben County, NY, 7803 ft.
Figure A4-10.
FIGURE A4-10. Bitumen filling intercrystalline pore space in dolostone, Grey #1 well, Steuben County, NY, 7803 ft. Bitumen filling intercrystalline pore space in dolostone, Whiteman #1 well, Chemung County, NY, 9531 ft.
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