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Castillo, Paterno R; Batiza, Rodey; Stern, Robert J (1986): Petrology and geochemistry at DSDP Site 89-462 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.800065, Supplement to: Castillo, PR et al. (1986): Petrology and geochemistry of Nauru Basin igneous complex: Large-volume, off-ridge eruptions of MORB-like basalt during the Cretaceous. In: Moberly, R; Schlanger, SO; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 89, 555-576, https://doi.org/10.2973/dsdp.proc.89.122.1986

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Abstract:
The 16 samples of Deep Sea Drilling Project (DSDP) Leg 89 basalts that we analyzed for whole rock major and trace elements and for mineralogic compositions are identical to some of the basalts recovered during Leg 61. Leg 89 samples are mostly olivine-plagioclase-clinopyroxene sparsely phyric basalts and exhibit a wide variety of textures. These basalts have lower TiO2 at a given Mg/(Mg+Fe2+)*100 than MORB (midocean ridge basalt). We recognize three major chemical types of basalts in the Nauru Basin. We believe that different degrees of partial melting, modified by fractional crystallization and possibly by magma mixing at shallow depths, can explain the chemical differences among the three groups. This petrogenetic model is consistent with the observed downhole chemical-chronostratigraphic relations of the samples.
New 87Sr/86Sr and U3Nd/144Nd analyses of basalt samples from DSDP Site 462 indicate that the Nauru Basin igneous complex is within the Sr-Nd isotopic range of ocean island basalt. Thus the Nauru Basin igneous complex resembles MORB in many aspects of its chemistry, morphology, and secondary alteration patterns (Larson, Schlanger, et al., 1981), but not in its isotopic characteristics. If it were not for the unambiguous evidence that the Nauru Basin complex was erupted off-ridge, the complex could easily be interpreted as normal oceanic layer 2. For this reason, we speculate that the Nauru Basin igneous complex was produced in an oceanic riftlike environment when multiple, fast-propagating rifts were formed during the fast seafloor spreading episode in the Cretaceous.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 7.240860 * Median Longitude: 165.031460 * South-bound Latitude: 7.237500 * West-bound Longitude: 165.030500 * North-bound Latitude: 7.241700 * East-bound Longitude: 165.031700
Date/Time Start: 1982-11-05T00:00:00 * Date/Time End: 1982-11-05T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
5 datasets

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Datasets listed in this publication series

  1. Castillo, PR; Batiza, R; Stern, RJ (1986): (Table 7) Chemical compositions and CIPW norms of DSDP Site 89-462 primary basalts. https://doi.org/10.1594/PANGAEA.800064
  2. Castillo, PR; Batiza, R; Stern, RJ (1986): (Table 4) Trace element concentrations and isotope ratios for DSDP Site 89-462 basalts. https://doi.org/10.1594/PANGAEA.800063
  3. Castillo, PR; Batiza, R; Stern, RJ (1986): (Table 3) Chemical composition of basalts from DSDP Site 89-462. https://doi.org/10.1594/PANGAEA.800067
  4. Castillo, PR; Batiza, R; Stern, RJ (1986): (Table 1) Chemical composition of plagioclase from DSDP Hole 89-462A. https://doi.org/10.1594/PANGAEA.800060
  5. Castillo, PR; Batiza, R; Stern, RJ (1986): (Table 2) Chemical composition of pyroxene from DSDP Hole 89-462A. https://doi.org/10.1594/PANGAEA.800061