Ââåäåíèå Ñòðîåíèþ òâåðäûõ òêàíåé êîíîäîíòîâûõ ýëåìåíòîâ ïîñâÿùåíà ìíî-ãî÷èñëåííàÿ ëèòåðàòóðà, íà÷èíàÿ ñ ðàáîò Õ. Ïàíäåðà (1856). Îáøèðíûé îáçîð ñîâðåìåííîãî ñîñòîÿíèÿ çíàíèé î ãèñòîëîãèè òâåðäûõ òêàíåé êîíîäîíòîâûõ ýëåìåíòîâ ñîäåðaeèòñÿ â ðàáîòå Ô. Äîíîõüþ [12]. Ïðîâåäåííûå âïîñëåäñòâèè èññëåäîâàíèÿ ïîçâîëèëè íåñêîëüêî óòî÷íèòü êëàññèôèêà

Ñòàòüÿ ïîñâÿùåíà âîçìîaeíîñòÿì èñïîëüçîâàíèÿ ðåíòãåíîòîìîãðàôè÷åñêîãî ìåòîäà äëÿ ìèêðîïàëåîíòîëîãè÷åñ-êîãî (êîíîäîíòû) èçó÷åíèÿ êðåìíèñòûõ è êðåìíèñòî-ãëèíèñòûõ îòëîaeåíèé, â êîòîðûõ ïðèìåíåíèå òðàäèöèîííûõ ìåòî-äîâ çàòðóäíåíî.Ìàòåðèàëîì äëÿ äàííîé ðàáîòû ïîñëóaeèëè îáðàçöû ðàçëè÷íûõ ñèëèöèòîâ è êðåìíèñòûõ àðãèëëèòîâ èç ãëóáîêîâîä-íûõ îòëîaeåíèé äåâîíñêîãî è ðàííåêàìåííîóãîëüíîãî âîçðàñòà Ïðèïîëÿðíîãî Óðàëà è Ñåâåðî-Âîñòî÷íîãî Ïàé-Õîÿ.Ðåíòãåíîòîìîãðàôè÷åñêîå èçó÷åíèå 38 îáðàçöîâ îáùèì îáúåìîì 20.4 ñì 3 ïðîâîäèëîñü íà òîìîãðàôàõ SkyScan 1272 è SkyScan 1173 â ÍÌÑÓ «Ãîðíûé» (Ñàíêò-Ïåòåðáóðã) ñ ïðîñòðàíñòâåííûì ðàçðåøåíèåì 4-7 ìêì.Ïîëó÷åííûå ðåçóëüòàòû ïîêàçàëè, ÷òî íàèáîëåå êîíòðàñòíû ïî ðåíòãåíîâñêîé ïëîòíîñòè è õîðîøî îïîçíàþòñÿ íà òîìîãðàììàõ êîíîäîíòîâûå ýëåìåíòû â ÷èñòûõ ñèëèöèòàõ è êðåìíèñòûõ àðãèëëèòàõ.  ýòèõ aeå ïîðîäàõ îòìå÷åíà ìàêñè-ìàëüíàÿ êîíöåíòðàöèÿ êîíîäîíòîâûõ ýëåìåíòîâ. Ðåíòãåíîòîìîãðàôè÷åñêèé ìåòîä ìîaeåò èñïîëüçîâàòüñÿ äëÿ ïîèñêà è èäåíòèôèêàöèè êîíîäîíòîâûõ ýëåìåíòîâ, âíå çàâèñèìîñòè îò ôîðìû èõ ñîõðàííîñòè, â ñëîaeíî äåçèíòåãðèðóåìûõ êðåì-íèñòûõ è ãëèíèñòî-êðåìíèñòûõ ïîðîäàõ. Òàêñîíîìè÷åñêàÿ äèàãíîñòèêà âîçìîaeíà ëèøü ïðè âûñîêîì ïðîñòðàíñòâåííîì ðàçðåøåíèè òîìîãðàìì (ðàçìåð ýëåìåíòà èçîáðàaeåíèÿ ìåíüøå 5-7 ìêì). Êëþ÷åâûå ñëîâà: êîíîäîíòû, ðåíòãåíîâñêàÿ ìèêðîòîìîãðàôèÿ, êðåìíèñòûå ïîðîäû.The article deals with possibilities of the computed X-ray microtomography (XMT) in micropalaeontological (conodonts) study of the siliceous and clayey deposits. Using of the traditional methods in this type of deposits is difficult.The work is based on collection of silicites (lithological type xa1), clayey silicites (lithological type xa2), cherty argillites (lithological type xa3), and limy silicites (lithological type xa4) from the deep-water Devonian and Carboniferous sequences of the Subpolar Urals and NE Pay-Khoy.Thirty-eight samples (about 20.4 cm 3 ) were studied with X-ray microtomographs SkyScan 1272 and SkyScan 1173 in the NMSU «Gornyi» (Saint-Petersburg, Russia) with spatial resolution of 4-7 um. About 190 conodont elements and their fragments were found in the tomograms.The possibility of recognition of the conodont elements depends on lithological type of the host rock. The best contrast between conodont elements and host rock is detected in lithological types xa1 and xa3. These lithological types demonstrate maximal concentration of the conodont elements in the rock as well. The concentration of conodonts is up to 90 spec./cm 3 . The present study shows that XMT method is useful for search and identification of the conodonts in siliceous and clayey deposits. Taxonomic identification is possible just in tomograms of high spatial resolution (5-7 um).

On page 337, the third and fifth legends in Figure 2 should read Laminaria saccharina , Polymastia arctica , respectively. On page 339, the first column of Table 1 row 6 should read Ahnfeltia plicata row 7 should read Corallina sp. row 8 should read Lithothamnion sp. row 19 should read Pigospio elegans row 26 should read Hiatella arctica row 27 should read Mytilus edulis row 30 should read Margarites groenlandicus row 36 should read Asterias rubens row 40 should read Molgula sp. In the second column of Table 1 row 6 should read Rhodophyta row 40 should read Ascidiacea On page 340, the first column of Table 2 row 4 should read Polysiphonia nigrescens row 5 should read Rhodophyta gen. sp. row 6 should read Rhodophyllus sp. row 15 should read Leucosolenia complicata row 18 should read Lucernaria quadricornis row 24 should read Shizoporella limbata row 27 should read Hiatella arctica row 29 should read Nicania montagui row 30 should read Margarites groenlandicus row 31 should read Testudinalia tesselata row 38 should read Ophiura robusta In the second column of Table 2 row 2 should read Rhodophyta row 39 should read Ascidiacea ERRATA

 ñòàòüå äàþòñÿ ñòðîåíèå ðàçðåçà è êîíîäîíòîâàÿ õàðàêòåðèñòèêà êàðñêîé ñâèòû ñåâåðà Êàðñêîãî ñëàíöåâîãî àëëîõòîíà. Êàðñêàÿ ñâèòà çàëåãàåò íà âåðõíåòóðíåéñêîé ñèëîâàÿõèíñêîé ñâèòå è ïåðåêðûâàåòñÿ íèaeíåáàøêèðñêîé êàðàñèëîâñêîé ñâèòîé. Âåðõíÿÿ ÷àñòü ñèëîâàÿõèíñêîé ñâèòû îõàðàêòåðèçîâàíà ïîçäíåòóðíåéñêèìè êîíîäîíòàìè. Íèaeíèå ïà÷êè êàðñêîé ñâèòû ïðåäñòàâ-ëåíû êàðáîíàòíûìè ãðàäàöèîííûìè öèêëèòàìè è ñîäåðaeàò ðàííåâèçåéñêèå êîìïëåêñû êîíîäîíòîâ, à áîëüøàÿ ÷àñòü ñâèòû ñëîaeå-íà ïåëèòîìîðôíûìè è òîíêîäåòðèòîâûìè èçâåñòíÿêàìè ñ ïðîñëîÿìè ìðàìîðèçîâàíûõ êàðáîíàòîâ è îòâå÷àåò êîíîäîíòîâûì çî-íàì bilineatus -bollandensis âåðõíåãî âèçå -ñåðïóõîâà. Âèçåéñêî-ñåðïóõîâñêàÿ ãðàíèöà ïðîâåäåíà ïî èñ÷åçíîâåíèþ òèïè÷íî âè-çåéñêèõ ôîðì. Ðàçðåç êàðñêîé ñâèòû íà ñåâåðå Ïàé-Õîÿ ïî ëèòîëîãè÷åñêîé õàðàêòåðèñòèêå è ìîùíîñòè ìàëî îòëè÷àåòñÿ îò ñòðàòî-òèïà. Áèîñòðàòèãðàôè÷åñêèå äàííûå ïî êîíîäîíòàì îáîñíîâûâàþò ïîçäíåâèçåéñêî-ñåðïóõîâñêèé âîçðàñò ñâèòû è îáåñïå÷èâàþò åå êîððåëÿöèþ ñ íèaeíåé ÷àñòüþ áîëâàíñêîé ñâèòû êàðáîíàòíîãî ïàðàâòîõòîíà.Êëþ÷åâûå ñëîâà: Ïàé-Õîé, ñòðàòèãðàôèÿ, êàðñêàÿ ñâèòà, êîíîäîíòû.

The dolomites of White Rock deposit were explored in 1958. Their composition includes fluxing limestones and dolomites.During use of the deposit disagreement of the data of exploration and actual results, which made it necessary to conduct work on further investigation of the dolomites, occurred.For the purpose of a composite investigation of the raw material the limestones and the dolomitic limestones with not more than 5 wt.% of MgO were evaluated as a metallurgical flux and the dolomites as refractory raw materials.Nine samples of dolomites taken from drilled cores were investigated.In appearance, all of the samples were uniform and light gray in color and the macrostructure of the samples was dense and fine-grained.Under the microscope it may be seen that the structure of the dolomites is mixed grain size (Fig. i). The main portion of the dolomite has a structure from coarse-grained (grain size 0.48-0.80 mm) to very fine-grained (0.04-0.08 mm).Calcite and iron hyroxides with an insignificant quantity of clay material are distributed in "healed" microcracks or in the form of individual inclusions.The presence of calcite in the medium, fine, and very-finegrained varieties of dolomite was established after diagnostic etching in 10% HCI (Fig. ibd).The quantity of calcite in the dolomites of White Rock deposit is from 5 to 16 vol.% and therefore they are considered low-lime ones.The strength properties of the dolomites were studied.The content of the individual fractions obtained after crushing of the material in a jaw crusher and separation into the 20-5, 5-1, and finer than i-mm fractions was taken as the criterion of evaluation of the strength of the dolomites.The data obtained indicates that the investigated dolomites have primarily similar strength, with the exception of samples No. 2 and 3 ( Table i). The increased content in these samples of the finer than l-mm fraction is apparently caused by the more core-grained structure.The average open porosity was from 1.5 to 7.2%, the apparent density from 2.60 tQ 2.77 g/cm 3, and the water content from 0.6 to 2.8%.For all the samples thermogravimetric analysis established two endothermic effects characteristic of the dolomite rocks. The endothermic effects at 770 to 790~ are caused by decomposition of dolomite into MgCO3 and CaC03 and at the moment of its formation the MgCO3 dissociates into MgO and CO2. The amount and temperature of this effect depend upon the size of the dolomite crystals, the degree of isomorphous substitutions and the mechanical impurities~ TABLE io Grain-Size Composition of the Dolomites after Crushing in a Jaw Crusher sample Noo .Wt. ~oof the fraction, mm 20---5 5--1