The Chromium Industry of the U.S.S.R. Page: 11
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11
width varies considerably. Chromite segregations are located
in various sectors of the massif and at different depths from
the surface. The ore bodies are variable in size, and their
component ores vary widely in quality. About 160 deposits
are concentrated within the massif. The deposits of the Batam-
shinsk zones are in the northern part of the massif. These
deposits, associated mainly with periodotites, are usable
mainly for refractory purposes. In the southern part of themassif, in the Stepnin, Southwestern, and Tagashasay uplifts,
there are small deposits and ore occurrences. Near the south-
eastern arched uplift is the main ore field. Here more than
70 chromite ore deposits are distributed irregularly as clusters
in a large massif of serpentinized ultrabasic rocks whose
outcrops amount to 920 km2 exposed area (see figure 3). The
Southern (Donskoy) group, which consists primarily of
serpentinized dunites, is the richest.Figure 3.-Structural-petrographical diagram of the Paleozoic basement of the Kempirsay ultramafic massif and its relationship
to the Paleozoic and Proterozoic rocks. (Modified and adapted from reference 12.) 1-Lower Carboniferous-Upper Devonian sandstones, con-
glomerates, argillites, and siltstones (Zilair Group); 2-Upper Devonian cherty rocks, siltstones, and crystalline limestones (Egjda Group-D3eg);
3-Middle Devonian (Givetian) coarse-pebbly and blocky conglomerates and diabase porphyrites (Aitpai Group); 4-Lower Silurian (Llandoverian-
Wenlockian) diabases, amygdaloidal basalts, and siliceous tuffs; 5-Lower and Middle Ordovician eruptives of basic and intermediate composition,
tuff-sandstones, siliceous schists, conglomerates, and limestones (Kuagash Group); 6-Lower Ordovician (Upper Tremadocian) clay-chert slates with
seams of quartzites, arkosic sandstones, and siliceous tuffites; 7-Lower Ordovician (Tremadocian) aregillites, sandstones, seams of tuffs and siltstones
(Kidraysovsk Group); 8-Upper Proterozoic sericite-chlorite-quartz, clay-quartz, chert-graphite, and other schists (lower Kayala subgroup of Kayala
Group); 9-gabbro-amphibolites; 10-gabbros; 11-olivine and amphibolized gabbros; 12-serpentinites after dunites; 13-serpentinites after
peridotites; 14-serpentinites after pyroxene dunites; 15-undifferentiated serpentinites; 16-boundaries of areas of maximum development of dunites;
17-boundary of Kempirsay ultramafic massif; 18-tectonic fractures (a-confirmed, b-assumed); 19-attitude of contact of ultramafic massif;
20-axes of anticlines; 21-axes of synclines; 22-outline of magma-feeding channel; Chromite deposits: 23-large, 24-medium, 25-small; 26-lean
disseminated ores.
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Strishkov, Vasilii V. & Steblez, Walter G. The Chromium Industry of the U.S.S.R., report, 1985; [Washington D.C.]. (https://digital.library.unt.edu/ark:/67531/metadc40313/m1/16/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.