| Abstract: | Stratiform tourmalinites are more widespread than previously recognized in many regional metamorphic terrains. They are especially common in Proterozoic and early Palaeozoic sequences dominated by clastic metasediments and consist of conformable layers made up primarily of quartz and abundant tourmaline, the latter typically exceeding 15-20% by volume. Striking sedimentary structures such as graded bedding, cross-laminations, slump and flame structures and rip-up clasts, are preserved in a few tourmalinites. These and other geological features suggest that tourmalinites form by early diagenetic modification of a primary boron-rich chemical precipitate. Tourmalinites are significant in preserving a valuable record of unusual chemical and palaeogeographic conditions in clastic sedimentary basins. Their close association with a variety of stratabound deposits of Au, W, Sn, Co and base-metals may permit a clearer understanding of ore-forming processes, as well as the definition of prospective exploration targets. -L.C.H. |
| Genre: | Article |
| ProdID: | 70012650 |
| Citation Author: | Slack, J. F.; Herriman, N.; Barnes, R. G.; Plimer, I. R. |
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| Citation End Page: | 716 |
| Citation Issue: | 12 |
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| Citation Language: | English |
| Citation Larger Work Title: | Geology |
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| Citation Number Of Pages: | 4 |
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| Citation Search Results Text: | Stratiform tourmalinites in metamorphic terranes and their geologic significance.; 1984; Article; Journal; Geology; Slack, J. F.; Herriman, N.; Barnes, R. G.; Plimer, I. R. |
| Citation Start Page: | 713 |
| Citation Volume: | 12 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Stratiform tourmalinites in metamorphic terranes and their geologic significance.; 1984; Article; Journal; Geology; Slack, J. F.; Herriman, N.; Barnes, R. G.; Plimer, I. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
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