| Abstract: | Geologic evidence suggests that a series of ultramafic complexes of the ‘Duke Island type‘ located along a 560 km-long belt in southeastern Alaska crystallized from magmas of ultramafic composition. Some geologists have proposed that these magmas were derived by fractional fusion of ultramafic material in the upper mantle. The 87Sr/86Sr ratios, corrected for growth of radiogenic 87Sr, in total rock samples and in minerals from four ultramafic complexes range from 0.7026 to 0.7068, and the K/Rb ratios in total rock samples range from 300 to 1200. Other workers have reported that the isotopic composition of strontium in alpine peridotites is significantly different from that of oceanic volcanic rocks, but the 87Sr/86Sr ratios of the Alaskan ultramafites and of oceanic volcanic rocks are similar. ?? 1968. |
| Genre: | Article |
| ProdID: | 70009907 |
| Citation Author: | Lanphere, M. A. |
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| Citation End Page: | 190 |
| Citation Issue: | 3 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earth and Planetary Science Letters |
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| Citation Number Of Pages: | 6 |
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| Citation Search Results Text: | SrRbK and Sr isotopic relationships in ultramafic rocks, southeastern Alaska; 1968; Article; Journal; Earth and Planetary Science Letters; Lanphere, M. A. |
| Citation Start Page: | 185 |
| Citation Volume: | 4 |
| Citation Year: | 1968 |
| Type: | citation/reference |
| Text: | SrRbK and Sr isotopic relationships in ultramafic rocks, southeastern Alaska; 1968; Article; Journal; Earth and Planetary Science Letters; Lanphere, M. A. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Mon, 1 Jan 1968 00:00 -0600 |
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