Figure F69. Representative vector endpoint demagnetization diagrams for discrete samples and long-core measurements from Hole 1271A. (A) Discrete (Sample 209-1271A-4R-2, 103–105 cm) and (B) long-core (Section 209-1271A-4R-2, 104 cm) measurements in the same core interval commonly yield similar final directions but with a significantly different degree of steep, drilling-related overprint. Demagnetization diagrams for (C) 9.2-cm3 cube (Sample 209-1271A-4R-2, 26–28 cm), (D) 25-cm3 quarter-round (Sample 209-1271A-4R-2, 22–25 cm), and (E) archive-half (Section 209-1271A-4R-2, 24 cm) data from Section 209-1271A-4R-2 (Piece 1). The quarter-round and archive-half results show steeper initial results and a final direction that is different from the measurement for the discrete sample. NRM = natural remanent magnetization. Solid circles = projections onto the horizontal plane and open circles = projections onto the vertical plane.

Figure F69. Representative vector endpoint demagnetization diagrams for discrete samples and long-core measurements from Hole 1271A. (A) Discrete (Sample 209-1271A-4R-2, 103–105 cm) and (B) long-core (Section 209-1271A-4R-2, 104 cm) measurements in the same core interval commonly yield similar final directions but with a significantly different degree of steep, drilling-related overprint. Demagnetization diagrams for (C) 9.2-cm³ cube (Sample 209-1271A-4R-2, 26–28 cm), (D) 25-cm³ quarter-round (Sample 209-1271A-4R-2, 22–25 cm), and (E) archive-half (Section 209-1271A-4R-2, 24 cm) data from Section 209-1271A-4R-2 (Piece 1). The quarter-round and archive-half results show steeper initial results and a final direction that is different from the measurement for the discrete sample. NRM = natural remanent magnetization. Solid circles = projections onto the horizontal plane and open circles = projections onto the vertical plane.