МИНЕРАЛОГИЯ РОССЫПНЫХ ПРОЯВЛЕНИЙ АЛМАЗОВ АНГАРО-УДИНСКОГО МЕЖДУРЕЧЬЯ ЮГА СИБИРСКОЙ ПЛАТФОРМЫ
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dc.contributor.author | Егоров К.Н. | |
dc.contributor.author | Кошкарев Д.А. | |
dc.contributor.author | Зинчук Н.Н. | |
dc.contributor.author | Денисенко Е.П. | |
dc.contributor.author | Заравняев В.А. | |
dc.date.accessioned | 2024-07-07T05:18:04Z | |
dc.date.available | 2024-07-07T05:18:04Z | |
dc.date.issued | 2006 | |
dc.identifier | https://elibrary.ru/item.asp?id=12894969 | |
dc.identifier.citation | Записки Российского минералогического общества, 2006, 135, 2, 1-15 | |
dc.identifier.issn | 0869-6055 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/44314 | |
dc.description.abstract | The paper presents new data on mineralogy of diamond-bearing placers occurring in the interfluvial area between the Angara and Uda rivers. It is shown, for the first time, that minerals - indicators for diamond arc detected in all the placers known there. Diamonds of various size and morphology were identified in flood-plain deposits and channel fill of Chuksha and Talaya (right tributary of the Udinsky Tanguy river) rivers. As diamonds so the minerals-indicators have come into the placer-bearing alluvial deposits from different and separated sources. Small pyropcs, chromospinelides of the III-IV preservation classes and the mechanically eroded diamonds arc related to erosion of the Lower Carboniferous rocks of Baycronovskaya scries. Angular grains of pyropcs, pyrope-almandincs, well preserved low Fc chromites and chromodiopsides may associate with diamonds without signs of mechanical erosion from the Middle Paleozoic or Mezozoic kimberlitic (or lamproitic) source. Pyrope-grossular-almandinc scries garnets of the I"sl preservation class make paragenesis with diamond cuboids of the H"nd variety. Rare chromcvanadium minerals (goldmanites, lavrovites) from Olkhonskaya and Sly-udyanskaya series, found also in placers between the Angara and Uda rivers, may be considered as indirect indicators for cubic diamonds of mctamorphogcnic type. | |
dc.subject | Paleozoic | |
dc.subject | Carboniferous | |
dc.title | МИНЕРАЛОГИЯ РОССЫПНЫХ ПРОЯВЛЕНИЙ АЛМАЗОВ АНГАРО-УДИНСКОГО МЕЖДУРЕЧЬЯ ЮГА СИБИРСКОЙ ПЛАТФОРМЫ | |
dc.type | Статья | |
dc.subject.age | Paleozoic | |
dc.subject.age | Paleozoic::Carboniferous |
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