PANGAEA_759426
Composition of Broken Ridge samples (Table 1)
Gibson, Ian L
Composition of Broken Ridge samples (Table 1)
1991
PANGAEA
Dataset
Supplement to: Gibson, Ian L (1991): Diagenesis, heat flow, and rifting at Broken Ridge, Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 519-523, https://doi.org/10.2973/odp.proc.sr.121.164.1991
https://doi.pangaea.de/10.1594/PANGAEA.759426
Investigator
Ian L
Gibson
Earth Science
Event label
Sample code/label
Number
DEPTH, sediment/rock
Depth, reconstructed
Mineral name
Heulandite
Clay
Plagioclase
Calcium carbonate
geoscientificInformation
121-752B
121-753A
121-754A
121-754B
121-755A
Drilling/drill rig
Leg121
DSDP/ODP/IODP sample designation
Calculated
X-ray diffraction (XRD)
Joides Resolution
1988-05-12
1988-05-24
Complete
-31.03
-30.839
93.5467
93.5899
45.5 m (DEPTH, sediment/rock)
406.8 m (DEPTH, sediment/rock)
ODP
Ocean Drilling Program
unrestricted
CC-BY-3.0: Creative Commons Attribution 3.0 Unported
English
PANGAEA
Data Publisher for Earth & Environmental Science
https://www.pangaea.de/
Data Center Contact
Michael
Diepenbroek
info@pangaea.de
Leobener Str.
Bremen
Bremen
28359
Germany
online
268 data points
text/tab-separated-values
The Broken Ridge tilted and truncated sequence of middle Eocene to Turanian calcareous sediments with intercalated basaltic ash layers is characterized by diagenetic alteration. The level at which opal-CT forms from volcanic glass and the opal-CT/quartz boundary shows that this alteration increases in intensity with stratigraphic depth and is not related to depth below the seafloor. Thus, the rocks were altered before they were tilted and truncated. The preservation of the pre-rift alteration history may be a function of the rapid uplift and erosion following the initiation of spreading between Broken Ridge and the Kerguelen Plateau. The geothermal gradient at the time of rifting, deduced from the pattern of silica diagenesis, agrees with results from present-day heat-flow measurements and suggests that there was no large thermal anomaly at Broken Ridge that time. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.759426"! ** At Site 753, stratigraphic depth = mbsf; at Site 752, stratigraphic depth = mbsf + 77 m; at Site 754, stratigraphic depth = mbsf + 342 m; at Site 755, stratigraphic depth = mbsf + 1091.5 m. These transformations assume that 190 m of the section is missing between Sites 753 and 752, that there is a 20-m overlap between Sites 752 and 754, and that 460 m of the section is missing between Sites 754 and 755.
https://doi.org/10.2973/odp.proc.ir.121.1989
Leg121
https://doi.org/10.2973/odp.proc.sr.121.164.1991
Diagenesis, heat flow, and rifting at Broken Ridge, Indian Ocean
https://hdl.handle.net/10013/epic.27914.d001
DSDP/ODP/IODP sample designation
https://www-odp.tamu.edu:443/
ODP
https://www-odp.tamu.edu:443/resolutn.html
Joides Resolution
DIF
9.4
2026-02-06