Iron X-ray fluorescence (XRF) scannings of ODP Holes 165-1001A and 171-1050C
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| Format: | Dataset Open Access |
| Sprache: | en |
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PANGAEA
2001
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| _version_ | 1867168559156690944 |
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| author | Röhl, Ursula Ogg, James G Geib, Tricia L Wefer, Gerold |
| author_facet | Röhl, Ursula Ogg, James G Geib, Tricia L Wefer, Gerold |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Abstract: Ocean Drilling Program Sites 1001A (Caribbean Sea) and 1050C (western North Atlantic) display obliquity and precession cycles throughout polarity zone C27 of the late Danian stage (earliest Cenozoic time). Sliding-window spectra analysis and direct cycle counting on downhole logs and high-resolution Fe variations at both sites yield the equivalent of 35-36 obliquity cycles. This cycle-tuned duration for polarity chron C27 of 1.45 Ma (applying a modern mean obliquity period of 40.4 ka) is consistent with trends from astronomical tuning of early Danian polarity chron C29 and 40Ar/39Ar age calibration of the Campanian-Maastrichtian magnetic polarity time scale. The cycle-tuned Danian stage (sensu Berggren et al. 1995, in SEPM Special Publications, 54, 129-212) spans 3.65 Ma (65.5-61.85 Ma). Spreading rates on a reference South Atlantic synthetic profile display progressive slowing during the Maastrichtian to Danian stages, then remained relatively constant through late Palaeocene and early Eocene time. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_774793 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Iron X-ray fluorescence (XRF) scannings of ODP Holes 165-1001A and 171-1050C Röhl, Ursula Ogg, James G Geib, Tricia L Wefer, Gerold 165-1001A; 171-1050C; Blake Nose, North Atlantic Ocean; Caribbean Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg165; Leg171B; Ocean Drilling Program; ODP; XRF core scanner Abstract: Ocean Drilling Program Sites 1001A (Caribbean Sea) and 1050C (western North Atlantic) display obliquity and precession cycles throughout polarity zone C27 of the late Danian stage (earliest Cenozoic time). Sliding-window spectra analysis and direct cycle counting on downhole logs and high-resolution Fe variations at both sites yield the equivalent of 35-36 obliquity cycles. This cycle-tuned duration for polarity chron C27 of 1.45 Ma (applying a modern mean obliquity period of 40.4 ka) is consistent with trends from astronomical tuning of early Danian polarity chron C29 and 40Ar/39Ar age calibration of the Campanian-Maastrichtian magnetic polarity time scale. The cycle-tuned Danian stage (sensu Berggren et al. 1995, in SEPM Special Publications, 54, 129-212) spans 3.65 Ma (65.5-61.85 Ma). Spreading rates on a reference South Atlantic synthetic profile display progressive slowing during the Maastrichtian to Danian stages, then remained relatively constant through late Palaeocene and early Eocene time. |
| title | Iron X-ray fluorescence (XRF) scannings of ODP Holes 165-1001A and 171-1050C |
| topic | 165-1001A; 171-1050C; Blake Nose, North Atlantic Ocean; Caribbean Sea; DRILL; Drilling/drill rig; Joides Resolution; Leg165; Leg171B; Ocean Drilling Program; ODP; XRF core scanner |
| url | https://doi.org/10.1594/PANGAEA.774793 |