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Rb-Sr and Sm-Nd Ages of Zagami DML and SR Isotopic Heterogeneity in Zagami
| Content Provider | Semantic Scholar |
|---|---|
| Author | Nyquist, L. E. Shih, C.-Y. Reese, Young D. |
| Copyright Year | 2010 |
| Abstract | Mail Code JE-23, ESCG/Muniz Engineering, Houston, TX, 77058. Introduction: Zagami contains lithologic heterogeneity sug-gesting that it did not form in a homogeneous, thick lava flow [1]. We have previously investigated the Sr and Nd isotopic sys-tematics of Coarse-Grained (CG) and Fine-Grained (FG) litholo-gies described by [2]. Both appear to belong to Normal Zagami (NZ) [1,3], but their initial Sr-isotopic compositions differ [4,5]. Here we report new analyses of the Dark Mottled Lithology (DML, [3]) that show its age and initial Sr and Nd isotopic com-positions to be identical within error limits with those of CG, but Sr initial isotopic compositions differ from those of FG. Rb-Sr Isochron Results: Eleven new Rb-Sr analyses of DML give an isochron age of 167±18 Ma (2 σ) for λ( |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20100023423.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
