(Table 1) Nd and Sr isotopic analyses of ODP Leg 127 basalts
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
1992
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| _version_ | 1867168103789494272 |
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| author | Nohda, Susumu Tatsumi, Yoshiyuki Yamashita, Shigeru Fujii, Toshitsugu |
| author_facet | Nohda, Susumu Tatsumi, Yoshiyuki Yamashita, Shigeru Fujii, Toshitsugu |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Sr and Nd isotopic compositions are reported for basaltic rocks collected during ODP Leg 127 from the Yamato Basin, a rifted backarc basin in the Japan Sea. The basalts are classified into two groups in terms of Nd isotopic composition: the upper sills at Site 797 are characterized by higher 143Nd/144Nd ratios (0.513083-0.513158, epsilon-Nd = 8.68-10.14) and the basalts from Site 794 and the lower sills at Site 797 have lower 143Nd/144Nd ratios (0.512684-0.512862, epsilon-Nd = 0.90-4.37). All of the basalts show higher Sr isotopic compositions than those of the mantle array, which is attributed to seawater alteration. The basalts with lower Nd isotopic values ranging in age from 20.6 to 17.3 Ma have tapped an enriched subcontinental upper mantle (SCUM) with the minor involvement of a depleted asthenospheric mantle (AM). Subsequent change in composition through the physical replacement of SCUM by AM yielded the basalts of the upper sills of higher Nd isotopic compositions. This event within the upper mantle was associated with the breakup of the overlying lithosphere during the rifting of the Japan Sea backarc basin. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_777524 |
| institution | PANGAEA |
| language | en |
| publishDate | 1992 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Nd and Sr isotopic analyses of ODP Leg 127 basalts Nohda, Susumu Tatsumi, Yoshiyuki Yamashita, Shigeru Fujii, Toshitsugu 127-794C; 127-795B; 127-797C; Barium; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Japan Sea; Joides Resolution; Leg127; Mass spectrometer Finnigan MAT 261; Neodymium; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Ocean Drilling Program; ODP; Samarium; Sample code/label; Sample comment; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Titanium dioxide; ε-Neodymium; ε-Strontium Sr and Nd isotopic compositions are reported for basaltic rocks collected during ODP Leg 127 from the Yamato Basin, a rifted backarc basin in the Japan Sea. The basalts are classified into two groups in terms of Nd isotopic composition: the upper sills at Site 797 are characterized by higher 143Nd/144Nd ratios (0.513083-0.513158, epsilon-Nd = 8.68-10.14) and the basalts from Site 794 and the lower sills at Site 797 have lower 143Nd/144Nd ratios (0.512684-0.512862, epsilon-Nd = 0.90-4.37). All of the basalts show higher Sr isotopic compositions than those of the mantle array, which is attributed to seawater alteration. The basalts with lower Nd isotopic values ranging in age from 20.6 to 17.3 Ma have tapped an enriched subcontinental upper mantle (SCUM) with the minor involvement of a depleted asthenospheric mantle (AM). Subsequent change in composition through the physical replacement of SCUM by AM yielded the basalts of the upper sills of higher Nd isotopic compositions. This event within the upper mantle was associated with the breakup of the overlying lithosphere during the rifting of the Japan Sea backarc basin. |
| title | (Table 1) Nd and Sr isotopic analyses of ODP Leg 127 basalts |
| topic | 127-794C; 127-795B; 127-797C; Barium; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Japan Sea; Joides Resolution; Leg127; Mass spectrometer Finnigan MAT 261; Neodymium; Neodymium-143/Neodymium-144 ratio; Neodymium-143/Neodymium-144 ratio, error; Ocean Drilling Program; ODP; Samarium; Sample code/label; Sample comment; Strontium; Strontium-87/Strontium-86 ratio; Strontium-87/Strontium-86 ratio, error; Titanium dioxide; ε-Neodymium; ε-Strontium |
| url | https://doi.org/10.1594/PANGAEA.777524 |