Appendix 1. Petrography of Florida tholeiite analyzed in this report.
ALTERATION/
DEGREE OF ACCESSORY SAMPLE GRAIN SIZE ALTERATION TEXTURE PHENOCRYSTS GROUNDMASS MINERALS COMMENTS
FGS 1 Medium Moderate-High Intergranular, PL (<C1%) PL>CPX;OP>GR AP, BI, CH, HB, Porphyritic SER
FGS 2 Coarse Moderate Subophytic, PL + CPX(<5%) PL >CPX>OP>GR AP, BI, CH, HB, Porphyritic SER
FGS 3' Medium-Coarse Fresh Subophytic, CPX + PL (<5%) PL"CPX.'OP>GR AP, CH, HB Porphyritic
FGS 4 Fine Moderate-High Trachytic, Ophimottled PL (.<1%) PL>CPX ,OP CH, CT, ZT, SER Vesicles filled with Vesicular, Porphyritic microcrystalline zeolite
FGS 5 Medium Fresh Isogranular. Trachytic. PL= CPX;OP BI Equigranular
FGS 6 Fine Moderate Isogranular, Trachytic, PL + CPX (<1%) PL> CPX >OP AP, CH, HB, ZT Porphyritic
FGS 7 Medium-Coarse Moderate-High Intergranular. PL>CPX>OP AP, BI, CH, SER, Equigranular ZT
FGS 8 Medium Moderate Intergranular, PL>.CPX>.OP-GR AP, BI, CH, SER Equigranular
FGS 9 Medium Moderate Intergranular to PL>CPX'OP BI, CH Skeletal opaques Isogranular,
Equigranular
FGS 10 Medium Fresh Intergranular. PL>CPX.OP BI, CH Zeolite filled vein Spherulitic,
Equigranular
FGS 11 Medium Fresh Isogranular to PL>CPX>OP CH Intergranular,
Equigranular
FGS 12-14' Fine-Medium Moderate Isogranular to PL PL=CPX>OP AP, CH, SER Intergranular,
Porphyritic
Grain sizes are Fine (50.1 mm), Medium (>0.1 mm, <1.0 mm) and Coarse (21.0 mm). Abbreviations for major mineral constituents are PL Plagioclase, CPX Clinopyroxene (Augite), OP Opaques. (Fe Ti Oxides). GR Granophyre (mintergrowths of Ouartz and K-Feldspar). Abbreviations for alteration and accessory minerals include: AP Apatite, BI Biotite, CH Chlorite, CT
-Calcite, HB Hornblende (uralite? in the alteration of clinopyroxene). SER Sericite. ZT Zeolites; indicates that thin-section does not exactly represent sampled interval on Table 5.
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