| Abstract: | A major obstacle in lunar U-Pb chronology is the elusiveness of the primary Pb isotopic composition and U/Pb ratio and therefore the Pb evolution for the early history of the moon. In an attempt to seek the primitive lunar Pb isotopoc composition, green glass from lunar clod 15426,49 was studied for U-Th-Pb systematics because it is extremely Mg-rich and known to be the most primitive among sampled lunar volcanic rocks. Because of the low Pb concentration and high U/Pb ratio observed for the interior, the initial Pb was poorly defined. Nevertheless, the data indicate that lunar Pb evolved in an environment with 238U/204Pb = 19-55, which is considerably lower than those for mare basalts (around 300) but higher than values for the Earth (6-8).-from Authors |
| Genre: | Article |
| ProdID: | 70014224 |
| Citation Author: | Tatsumoto, M.; Premo, W. R.; Unruh, D. M. |
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| Citation End Page: | 371 |
| Citation Issue: | B4 |
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| Citation Language: | English |
| Citation Larger Work Title: | Journal of Geophysical Research |
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| Citation Number Of Pages: | 11 |
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| Citation Search Results Text: | Origin of lead from green glass of Apollo 15426: a search for primitive lunar lead.; 1987; Article; Journal; Journal of Geophysical Research; Tatsumoto, M.; Premo, W. R.; Unruh, D. M. |
| Citation Start Page: | 361 |
| Citation Volume: | 92 |
| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Origin of lead from green glass of Apollo 15426: a search for primitive lunar lead.; 1987; Article; Journal; Journal of Geophysical Research; Tatsumoto, M.; Premo, W. R.; Unruh, D. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Thu, 1 Jan 1987 00:00 -0600 |
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