Clay in a structure of productive thickness of the Baku archipelago take a leading place and make 70 - 80 % of total amount of cuts. Here oil and gas deposits have been opened in analogues balahan and break retinues (V, VII, and VIII horizons on Karadagsky breakdown). The received results represent the big theoretical and practical interest. In difference of clays productive thickness of Apsheron archipelago in this structurally - facies zone involve attention wide circulation Na - Ñà of the cmectics. The maintenance of the smectics in colloidal fractions reaches 50 - 60 % in rare instances 70 % that gives to clay tyre covers high plasticity and considerably improves their shielding properties. Besides, in colloidal fractions of productive thickness of the Baku archipelago widespread low-temperature autogenous hydromica 1Ì and 1Ìd which is identified with occurrence of basal reflex d006 1,53À0. As minor differs kaolin in number of 10 - 15 % and dioctahedron chloride 3 - 5 %. Besides in clay tyre covers the Bottom - Kurinsky hollow and the Baku archipelago are established magnesia hydrosilicates - poligorskite and sepiolite, which presence proves to be true as according to the chemical analysis (maintenance ÌgÎ to 5 - 7 %) and on the electron-microscopic to pictures.


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