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AAPG Bulletin
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AAPG Bulletin; Year: 2025; Issue: April DOI: 10.1306/03182524012
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Figure 8. Wide brecciated crack-seal veins in well B. (A) Wide vein (Wv) with brecciated aspect and several phases of calcite cement. Contact with silicified spherulitestone (SiSph) host rock is irregular. Late quartz veins (Qv) cut wide calcite veins and host rock. Lower detail: Recracked fractures (Rf) formed by crack-seal and internal brecciation (IBr) appear to have been the predominant process. Upper detail: A breccia texture (Br) is observed just above the wide vein on the top of the core, showing rebrecciation evidence in the form of breccia clasts in younger breccias. (B) Wide brecciated vein with several clasts of host rock (Hrc) in the vertical position cemented with grayish quartz (Gqtz). On the top, the clasts lack organization. A shrubstone (Shr) is cut by the vein and shows horizontal shrub growth direction (GD). Yellowish quartz vein (Yqtz) cuts the shrubstone locally.
Figure 8. Wide brecciated crack-seal veins in well B. (A) Wide vein (Wv) with brecciated aspect and several phases of calcite cement. Contact with silicified spherulitestone (SiSph) host rock is irregular. Late quartz veins (Qv) cut wide calcite veins and host rock. Lower detail: Recracked fractures (Rf) formed by crack-seal and internal brecciation (IBr) appear to have been the predominant process. Upper detail: A breccia texture (Br) is observed just above the wide vein on the top of the core, showing rebrecciation evidence in the form of breccia clasts in younger breccias. (B) Wide brecciated vein with several clasts of host rock (Hrc) in the vertical position cemented with grayish quartz (Gqtz). On the top, the clasts lack organization. A shrubstone (Shr) is cut by the vein and shows horizontal shrub growth direction (GD). Yellowish quartz vein (Yqtz) cuts the shrubstone locally.