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![]() 7335 PDF Download |
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...(1998) Mineral. Mag. 62a, 1077-1078. [4] NeymarkL. A. et al. (1997) E OS 46(18), F788.Ninth Annual V. M. Goldschmidt Conference 7335.pdf... ...Pb isotopic compositions are radiogenic withmeasured 206 Pb/ 204 Pb between 100 and 1000, and207 Pb/ 204 Pb between 20.2 and 62. The 207 Pb/ 235 U agesof two homogeneous opals are 15.3 Ma for E1989... ...Earth Sciences, Royal Ontario Museum, Toronto, Ontario M5S 2C6, Canada (yuria@rom.on.ca), 2 Mail Stop 963,Pacific Western Technologies, DFC, De n ver CO 80225, USA (lneymark@usgs.gov).Introduction: Records of ancient water flow inarid environments are preserved in precipitated from... |
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