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The age of predictable primary diamond sources in the northeastern Siberian Platform |
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| Authors: | S A Grakhanov N N Zinchuk N V Sobolev |
| Institution: | 1. Institute of the Geology of Diamonds and Precious Metals, Siberian Branch, Russian Academy of Sciences, pr. Lenina 39, Yakutsk, 677007, Russia 2. Academy of Sciences of Republic of Sakha (Yakutia), pr. Lenina 33, Yakutsk, 677007, Russia 3. Sobolev Institute of Geology and Mineralogy, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia 4. Novosibirsk State University, ul. Pirogova 2, Novosibirsk, 630090, Russia |
| Abstract: | The U–Pb (SHRIMP) age was determined for zircons collected from 26 observation and sampling sites of diamonds and index minerals in the northeastern Siberian Platform. This part of the region hosts 15 low-diamondiferous Paleozoic and Mesozoic kimberlite fields, excluding the near economic Triassic Malokuonapskaya pipe in the Kuranakh field. Four epochs of kimberlite formation (Silurian, Late Devonian to Early Carboniferous, Middle to Late Triassic, and Middle to Late Jurassic) of the Siberian Platform, including its northeastern part, are confirmed as a result of our studies. Most observation points, including economic Quaternary diamond placers, contain Middle to Late Triassic zircons, which confirms the abundant Late Triassic volcanism in this region. The positive correlation of diamonds and major index minerals of kimberlites (mostly, garnets) at some observation sites indicates the possible Triassic age of the predictable diamondiferous kimberlites. |
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