Reddy, V Viswanatha; Subbarao, K V; Reddy, G R; Matsuda, J; Hekinian, Roger (1978): (Table 3) Chemical analyses from DSDP Holes 22-214, 22-215 and 22-216 in the Indian Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.762151, Supplement to: Reddy, VV et al. (1978): Geochemistry of volcanics from the Ninetyeast Ridge and its vicinity in the Indian Ocean. Marine Geology, 26(1-2), 99-117, https://doi.org/10.1016/0025-3227(78)90048-8
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Abstract:
The basalts and oceanic andesites from the aseismic Ninetyeast Ridge display trachytic, vesicular and amygdaloidal textures suggesting a subaerial volcanic environment. The normative composition of the Ninetyeast Ridge ranges from olivine picriteto nepheline-normative alkaline basalt, suggesting a wide range of differentiation. This is further supported by the fractionation-differentiation trends displayed by transition metal trace elements (Ni, Cr, V and Cu). The Ninetyeast Ridge rocks are enriched in rare earth (RE) and large ion lithophile (LIL) elements and Sr isotopes (0.7043-0.7049), similar to alkali basalts and tholeiites from seamounts and islands, but different from LIL-element-depleted tholeiitic volcanic rocks of the recent seismic mid-Indian oceanic ridge. The constancy of 87Sr/86Sr ratios for basalts and andesites is compatible with a model involving fractional crystallization of mafic magma. The variation of 87Sr/86Sr ratios between 0.97 and 2.79 may possibly be explained in terms of a primordial hot mantle and/or chemically contrasting heterogeneous mantle source layers relatively undepleted in LIL elements at different periods in the geologic past. In general, the Sr isotopic data for rocks from different tectonic environments are consistent with a "zoning-depletion model" with systematically arranged alternate alkali-poor and alkali-rich layers in the mantle beneath the Indian Ocean.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: -5.998767 * Median Longitude: 88.572567 * South-bound Latitude: -11.336800 * West-bound Longitude: 86.791700 * North-bound Latitude: 1.462200 * East-bound Longitude: 90.208000
Date/Time Start: 1972-02-08T00:00:00 * Date/Time End: 1972-02-18T00:00:00
Minimum Elevation: -5309.0 m * Maximum Elevation: -1655.0 m
Event(s):
22-214 * Latitude: -11.336800 * Longitude: 88.718000 * Date/Time: 1972-02-08T00:00:00 * Elevation: -1655.0 m * Penetration: 500 m * Recovery: 340.9 m * Location: Indian Ocean//RIDGE * Campaign: Leg22 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 53 cores; 492.5 m cored; 2.5 m drilled; 69.2 % recovery
22-215 * Latitude: -8.121700 * Longitude: 86.791700 * Date/Time: 1972-02-13T00:00:00 * Elevation: -5309.0 m * Penetration: 175 m * Recovery: 116 m * Location: Indian Ocean//BASIN * Campaign: Leg22 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 20 cores; 175 m cored; 0 m drilled; 66.3 % recovery
22-216 * Latitude: 1.462200 * Longitude: 90.208000 * Date/Time: 1972-02-18T00:00:00 * Elevation: -2237.0 m * Penetration: 477.5 m * Recovery: 169.2 m * Location: Indian Ocean//RIDGE * Campaign: Leg22 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 38 cores; 353 m cored; 0 m drilled; 47.9 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Reddy, V Viswanatha | DSDP/ODP/IODP sample designation | ||
| 3 | Rock type | Rock | Reddy, V Viswanatha | |||
| 4 | Potassium | K | mg/kg | Reddy, V Viswanatha | ||
| 5 | Rubidium | Rb | mg/kg | Reddy, V Viswanatha | ||
| 6 | Caesium | Cs | mg/kg | Reddy, V Viswanatha | ||
| 7 | Lanthanum | La | mg/kg | Reddy, V Viswanatha | ||
| 8 | Cerium | Ce | mg/kg | Reddy, V Viswanatha | ||
| 9 | Samarium | Sm | mg/kg | Reddy, V Viswanatha | ||
| 10 | Europium | Eu | mg/kg | Reddy, V Viswanatha | ||
| 11 | Terbium | Tb | mg/kg | Reddy, V Viswanatha | ||
| 12 | Ytterbium | Yb | mg/kg | Reddy, V Viswanatha | ||
| 13 | Nickel | Ni | mg/kg | Reddy, V Viswanatha | Emission spectrometry | |
| 14 | Chromium | Cr | mg/kg | Reddy, V Viswanatha | Emission spectrometry | |
| 15 | Vanadium | V | mg/kg | Reddy, V Viswanatha | Emission spectrometry | |
| 16 | Copper | Cu | mg/kg | Reddy, V Viswanatha | Emission spectrometry | |
| 17 | Potassium/Caesium ratio | K/Cs | Reddy, V Viswanatha | |||
| 18 | Potassium/Rubidium ratio | K/Rb | Reddy, V Viswanatha | |||
| 19 | Strontium-87/Strontium-86 ratio | 87Sr/86Sr | Reddy, V Viswanatha | |||
| 20 | Lanthanum/Samarium ratio | La/Sm | Reddy, V Viswanatha | (La/Sm)e.f. | ||
| 21 | Lanthanum/Ytterbium ratio | La/Yb | Reddy, V Viswanatha | (La/Yb)e.f. |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
158 data points