Castillo, Paterno R; Carlson, R W; Batiza, Rodey (2009): Isotopic composition of igneous rocks from DSDP Site 462 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.712184, Supplement to: Castillo, PR et al. (1991): Origin of Nauru Basin igneous complex: Sr, Nd and Pb isotope and REE constraints. Earth and Planetary Science Letters, 103(1-4), 200-213, https://doi.org/10.1016/0012-821X(91)90161-A
Always quote citation above when using data! You can download the citation in several formats below.
Abstract:
The tholeiitic basalts and microdolerites that comprise the Cretaceous igneous complex in the Nauru Basin in the western equatorial Pacific have moderate ranges in initial 87Sr/86Sr (0.70347 - 0.70356), initial 143Nd/144Nd (0.51278 - 0.51287), and measured 206Pb/204Pb (18.52 - 19.15), 207Pb/204Pb (15.48 - 15.66) and 208Pb/204Pb (38.28 - 38.81). These isotopic ratios overlap with those of both oceanic island basalts (OIB) and South Atlantic and Indian mid-ocean ridge basalts (MORB). However, the petrography, mineralogy, and bulk rock chemistry of the igneous complex are more similar to MORB than to OIB. Also, the rare earth element contents of Nauru Basin igneous rocks are uniformly depleted in light elements (La/Sm(ch) < 1) indicative of a mantle source compositionally similar to that of MORB. These results suggest that the igneous complex is the top of the original ocean crust in the Nauru Basin, and that the notion that the crust must be 15 to 35 m.y. older based on simple extrapolation and identification of the M-sequence magnetic lineations (Larson et al., 1981, doi:10.2973/dsdp.proc.61.1981; Moberly et al., 1985, doi:10.2973/dsdp.proc.81.1984) may be invalid because of a more complicated tectonic setting. The igneous complex most probably was extruded from an ocean ridge system located near the anomalously hot, volcanically active, and isotopically distinct region in the south central Pacific which has been in existence since c. 120 Ma.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 7.240393 * Median Longitude: 165.031327 * South-bound Latitude: 7.237500 * West-bound Longitude: 165.030500 * North-bound Latitude: 7.241700 * East-bound Longitude: 165.031700
Date/Time Start: 1978-05-28T00:00:00 * Date/Time End: 1982-11-05T00:00:00
Event(s):
61-462 * Latitude: 7.237500 * Longitude: 165.030500 * Date/Time: 1978-05-28T00:00:00 * Elevation: -5181.0 m * Penetration: 617 m * Recovery: 386 m * Campaign: Leg61 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 70 cores; 627.4 m cored; 0 m drilled; 61.5 % recovery
61-462A * Latitude: 7.241700 * Longitude: 165.031700 * Date/Time: 1978-06-09T00:00:00 * Elevation: -5177.0 m * Penetration: 1068.5 m * Recovery: 344 m * Campaign: Leg61 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 90 cores; 619.5 m cored; 14.5 m drilled; 55.5 % recovery
89-462A * Latitude: 7.241700 * Longitude: 165.031700 * Date/Time: 1982-11-05T00:00:00 * Elevation: -5177.0 m * Penetration: 1209 m * Recovery: 74.4 m * Location: North Pacific * Campaign: Leg89 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 17 cores; 137.3 m cored; 0 m drilled; 54.2 % recovery
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
3 datasets
Download Data
Datasets listed in this publication series
- Castillo, PR; Carlson, RW; Batiza, R (1991): (Table 3) Pb isotope composition of igneous rocks from DSDP Site 462. https://doi.org/10.1594/PANGAEA.712162
- Castillo, PR; Carlson, RW; Batiza, R (1991): (Table 1) Sr and Nd isotope ratios and trace element concentrations of igneous rocks from DSDP Site 462. https://doi.org/10.1594/PANGAEA.712161
- Castillo, PR; Carlson, RW; Batiza, R (1991): (Table 2) Rare earth element concentrations of igneous rocks from DSDP Site 462. https://doi.org/10.1594/PANGAEA.712159