Figure F30. Structural, textural, and mineralogical features of Subunit 4B Cores 205-1253A-36R through 40R described in terms of veins, fractures, magmatic contacts, and voids and proportions of each mineral phenocryst. Additional pictures illustrate the typical features of Subunit 4B. Blue = medium grained, green = fine grained, yellow = microcrystalline, white = cryptocrystalline. A = aggregates, L = laths. Phenocryst percentage expresses mineral abundance over the full section length. Y = yes, evidence of voids. The number of plus or minus symbols rates the abundance of voids. Magnetic polarity and close-up photographs of the main core macroscopic features are also shown. See text for criteria used to further subdivide Subunit 4B. 1, 6. Microcrystalline gabbro. 2. Cumulate fine- to medium-grained groundmass. 3. microcrystalline groundmass. 4. Fine-grained groundmass with 10% pyroxene phenocrysts (1-mm size and subhedral). 5. Microcrystalline to fine-grained groundmass. A. Interval 205-1253A-37R-1, 54-63 cm. B. Interval 205-1253A-37R-1, 107-116 cm. C. Interval 205-1253A-40R-1, 94-114 cm.

Figure F30. Structural, textural, and mineralogical features of Subunit 4B Cores 205-1253A-36R through 40R described in terms of veins, fractures, magmatic contacts, and voids and proportions of each mineral phenocryst. Additional pictures illustrate the typical features of Subunit 4B. Blue = medium grained, green = fine grained, yellow = microcrystalline, white = cryptocrystalline. A = aggregates, L = laths. Phenocryst percentage expresses mineral abundance over the full section length. Y = yes, evidence of voids. The number of plus or minus symbols rates the abundance of voids. Magnetic polarity and close-up photographs of the main core macroscopic features are also shown. See text for criteria used to further subdivide Subunit 4B. 1, 6. Microcrystalline gabbro. 2. Cumulate fine- to medium-grained groundmass. 3. microcrystalline groundmass. 4. Fine-grained groundmass with 10% pyroxene phenocrysts (1-mm size and subhedral). 5. Microcrystalline to fine-grained groundmass. A. Interval 205-1253A-37R-1, 54-63 cm. B. Interval 205-1253A-37R-1, 107-116 cm. C. Interval 205-1253A-40R-1, 94-114 cm.