Duncan, Robert A; Hargraves, Robert B (1990): (Table 1) 40Ar/39Ar plateau and isochron ages for basalts from the Réunion hotspot track [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.756141, Supplement to: Duncan, RA; Hargraves, RB (1990): 40Ar/39Ar geochronology of basement rocks from the Mascarene Plateau, the Chagos Bank, and the Maldives Ridge. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 43-51, https://doi.org/10.2973/odp.proc.sr.115.141.1990
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Abstract:
Concordant plateau and isochron ages were calculated from 40Ar/39Ar incremental heating experiments on volcanic rocks recovered by drilling at four Leg 115 sites and two industry wells along the volcanic lineament connecting Reunion Island to the Deccan flood basalts, western Indian Ocean. The new ages provide unequivocal evidence that volcanic activity migrated southward along this sequence of linear ridges. The geometry and age distribution of volcanism are most compatible with origin above a stationary hotspot centered beneath Reunion. The hotspot became active with rapid eruption of the Deccan flood basalts, western India, and subsequent volcanic products record the northward motion of the Indian and African plates over the hotspot through Tertiary time. The radiometric ages are in general accord with basal biostratigraphic age estimates, although some adjustments in current magnetobiostratigraphic time scales may be required.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -4.942700 * Median Longitude: 66.903325 * South-bound Latitude: -13.114000 * West-bound Longitude: 59.016800 * North-bound Latitude: 5.081500 * East-bound Longitude: 73.831300
Date/Time Start: 1987-05-24T03:30:00 * Date/Time End: 1987-06-28T07:45:00
Minimum Elevation: -2920.0 m * Maximum Elevation: -1552.0 m
Event(s):
115-706C * Latitude: -13.114000 * Longitude: 61.371000 * Date/Time Start: 1987-05-24T03:30:00 * Date/Time End: 1987-05-26T00:45:00 * Elevation: -2518.0 m * Penetration: 121.7 m * Recovery: 19.72 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 77.4 m cored; 0 m drilled; 25.5 % recovery
115-707C * Latitude: -7.545300 * Longitude: 59.016800 * Date/Time Start: 1987-05-29T10:30:00 * Date/Time End: 1987-06-02T03:30:00 * Elevation: -1552.0 m * Penetration: 443.2 m * Recovery: 91.56 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 259.4 m cored; 0 m drilled; 35.3 % recovery
115-713A * Latitude: -4.193000 * Longitude: 73.394200 * Date/Time Start: 1987-06-16T23:30:00 * Date/Time End: 1987-06-20T09:15:00 * Elevation: -2920.0 m * Penetration: 191.7 m * Recovery: 114.98 m * Location: Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 22 cores; 191.7 m cored; 0 m drilled; 60 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Duncan, Robert A | DSDP/ODP/IODP sample designation | ||
| 3 | Laboratory | Lab | Duncan, Robert A | |||
| 4 | Age, dated | Age dated | ka | Duncan, Robert A | wgt by 1/sigma**3, plateau age | |
| 5 | Age, dated standard deviation | Age dated std dev | ± | Duncan, Robert A | wgt by 1/sigma**3, plateau age | |
| 6 | Age, dated | Age dated | ka | Duncan, Robert A | wgt by % 39Ar, plateau age | |
| 7 | Age, dated standard deviation | Age dated std dev | ± | Duncan, Robert A | wgt by % 39Ar, plateau age | |
| 8 | Age, dated | Age dated | ka | Duncan, Robert A | integrated age | |
| 9 | Age, dated standard deviation | Age dated std dev | ± | Duncan, Robert A | integrated age | |
| 10 | Argon-39 | 39Ar | % | Duncan, Robert A | ||
| 11 | Age, dated | Age dated | ka | Duncan, Robert A | isochron age | |
| 12 | Age, dated standard deviation | Age dated std dev | ± | Duncan, Robert A | isochron age | |
| 13 | Sample amount | N | # | Duncan, Robert A | ||
| 14 | F-distribution | F-distribution | Duncan, Robert A | SUMS/(N-2), SUMS = goodness-of-fit parameter (York, 1969, doi:10.1016/S0012-821X(68)80059-7), N = number of steps includes | ||
| 15 | Argon-40/Argon-36 | 40Ar/36Ar | Duncan, Robert A | intercept | ||
| 16 | Argon-40/Argon-36, standard deviation | 40Ar/36Ar std dev | ± | Duncan, Robert A | intercept |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
225 data points
Data
| 1 Event | 2 Sample label | 3 Lab | 4 Age dated [ka] (wgt by 1/sigma**3, plateau age) | 5 Age dated std dev [±] (wgt by 1/sigma**3, plateau age) | 6 Age dated [ka] (wgt by % 39Ar, plateau age) | 7 Age dated std dev [±] (wgt by % 39Ar, plateau age) | 8 Age dated [ka] (integrated age) | 9 Age dated std dev [±] (integrated age) | 10 39Ar [%] | 11 Age dated [ka] (isochron age) | 12 Age dated std dev [±] (isochron age) | 13 N [#] | 14 F-distribution (SUMS/(N-2), SUMS = goodness-o...) | 15 40Ar/36Ar (intercept) | 16 40Ar/36Ar std dev [±] (intercept) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 115-706C | 115-706C-2R-2,63-66 | Oregon State University | 33100 | 300 | 33300 | 500 | 32500 | 700 | 42 | 34100 | 2200 | 5 | 4.2 | 280.5 | 20.9 |
| 115-706C | 115-706C-5R-1,71-74 | Oregon State University | 34200 | 500 | 34700 | 1700 | 31000 | 3000 | 62 | 32800 | 800 | 4 | 0.3 | 299.4 | 4.8 |
| 115-706C | 115-706C-8R-3,51-55 | Oregon State University | 32800 | 1100 | 33200 | 1700 | 33500 | 400 | 57 | 30500 | 2000 | 6 | 0.7 | 287.2 | 5.2 |
| 115-706C | 115-706C-5R-1,85-90 | Princeton University | 39000 | 1800 | 34800 | 6300 | 29900 | 2700 | 57 | 34900 | 2000 | 7 | 0.7 | 281.1 | 34.5 |
| 115-707C | 115-707C-26R-5,110-113 | Oregon State University | 63900 | 2200 | 63300 | 1300 | 61600 | 3800 | 76 | 64100 | 1100 | 4 | 0.2 | 294.9 | 2.7 |
| 115-707C | 115-707C-25R-1,104-106 | Princeton University | 73100 | 4200 | 72800 | 7600 | 59300 | 3800 | 60 | 74300 | 11000 | 4 | 1.3 | 294.3 | 6.6 |
| 115-707C | 115-707C-28R-4,133-136 | Princeton University | 58300 | 1400 | 56200 | 5500 | 44600 | 3400 | 70 | 63300 | 3700 | 6 | 6.9 | 280.0 | 8.4 |
| 115-713A | 115-713A-13R-2,142-144 | Oregon State University | 50900 | 3500 | 49800 | 3700 | 53200 | 1600 | 89 | 42700 | 5300 | 4 | 3.7 | 298.3 | 3.1 |
| 115-713A | 115-713A-15R-5,62-65 | Oregon State University | 49400 | 1200 | 49000 | 1100 | 53800 | 2400 | 86 | 49600 | 2500 | 6 | 1.5 | 296.9 | 1.8 |
| 115-713A | 115-713A-18R-1,27-30 | Oregon State University | 48900 | 3300 | 49000 | 5400 | 47500 | 5300 | 100 | 50500 | 1400 | 6 | 2.7 | 292.4 | 2.1 |
| 115-713A | 115-713A-19R-1,71-73 | Oregon State University | 48100 | 2800 | 48000 | 3100 | 50400 | 2300 | 81 | 51900 | 2800 | 5 | 0.2 | 294.6 | 1.9 |
| 115-713A | 115-713A-15R-4,43-47 | Princeton University | 50000 | 2100 | 49300 | 5400 | 43200 | 2300 | 59 | 49300 | 3100 | 6 | 1.9 | 298.3 | 6.2 |
| 115-715A | 115-715A-30R-5,132-135 | Oregon State University | 55600 | 900 | 56100 | 2200 | 55300 | 1600 | 86 | 55500 | 4500 | 7 | 1.6 | 295.6 | 1.0 |
| 115-715A | 115-715A-26R-2,12-15 | Princeton University | 57000 | 1100 | 58100 | 3600 | 61000 | 2200 | 65 | 57600 | 3800 | 8 | 1.9 | 294.2 | 10.8 |
| 115-715A | 115-715A-29R-2,32-35 | Princeton University | 58800 | 1900 | 65200 | 9500 | 61100 | 2000 | 85 | 59700 | 4800 | 9 | 1.4 | 306.9 | 15.7 |