| Abstract: | Variations in the abundances of Zn, Cu, and Pb are found to be useful in identifying tectonic regimes and separating ocean-island basalts into enriched- and depleted-source categories. The average Zn, Cu, and Pb contents of normal mid-ocean ridge basalts (N-MORB) are 84, 70, and 0.35 ppm, respectively. Differences in average Zn contents for various ridges reflect more the varying degrees of differentiation than variations of Zn content in the source rocks. At a Mg# of 70, or Mg#70, which is taken to represent primitive MORB, many MORB sequences converge at a Zn content of 58??6 ppm, which is close to the value for primitive mantle (50 ppm) and ordinary chondrites (~55 ppm). -from Author |
| Genre: | Article |
| ProdID: | 70018917 |
| Citation Author: | Doe, B. R. |
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| Citation End Page: | 420 |
| Citation Issue: | 5 |
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| Citation Language: | English |
| Citation Larger Work Title: | International Geology Review |
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| Citation Number Of Pages: | 42 |
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| Citation Search Results Text: | Zinc, copper, and lead geochemistry of oceanic igneous rocks - ridges, islands, and arcs; 1995; Article; Journal; International Geology Review; Doe, B. R. |
| Citation Start Page: | 379 |
| Citation Volume: | 37 |
| Citation Year: | 1995 |
| Type: | citation/reference |
| Text: | Zinc, copper, and lead geochemistry of oceanic igneous rocks - ridges, islands, and arcs; 1995; Article; Journal; International Geology Review; Doe, B. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1995 00:00 -0600 |
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