Kulyab Gr
Type Locality and Naming
Includes in Khation Region, Sughd Region. It was distinguished by B. A. Borneman (1934), who attributed to it the saline and gypsum-bearing deposits, lying with an angular unconformity on the Neogene near Kulyab. Later, A. R. Buracheck (Chikhachev et al., 1941) proposed to attribute to the Kulyabskaya Suite the formations named by V. I. Popov in the basin of the Saryob River as the Kilimbinsky Suite, and by B. M. Zdorik in the upper reaches of the Yakhso-Dash River as the Dashkansky Suite. B. P. Barhatov in 1957 attributed to the Kulyabskaya Suite also the formations similar in position in the section of the basin of the Qafirnigan River, exposed near Beshkent and Shaartuz. The term includes the Kulyab Gr, as well as the Kuruksay Fm and Kayruba Fm, whose stratigraphic relationship to the Kulyab Gr (кулябской свите) has not yet been reliably determined.
Synonym: Kulyab Complex, Кулябский комплекс, Kulyabskaya Suite (l(улябскую свиту)
Lithology and Thickness
In all the listed and distant from each other points, the Kulyab Gr is represented by colorful sandstones, argillites, clays, and conglomerates, sometimes with interlayers of gypsum and rock salt. The thicknesses of the rocks are approximately the same and amount to 200-500 m.
Relationships and Distribution
Lower contact
Kuruksay Fm. Common is the location of the described rocks in the incisions of the preceding relief, their lying with an angular unconformity on different thicknesses of the Paleogene and Neogene, dislocation (from insignificant to almost vertical), as well as a two-membered structure (the upper part lies on the lower with erosion, sometimes with an angular unconformity).
Upper contact
The described rocks are covered by Middle Quaternary and younger formations.
Regional extent
It is widespread in Southwest Tajikistan and in the Karateginsky region. V. P. Loziev and S. S. Lim (1962) in the Dushanbe district near Ordzhonikidzeabad, at the base of clayey sediments, which they correlate with the Kulab Gr and which most likely lie with an angular discordance on the Karanak Fm.
GeoJSON
Fossils
In the lower part of the section of the described sediments in the valley of the Sarob River, remains of tertiary trees were found. In the upper part of the Sarob section and in the section near Kulab, remains of quaternary gastropods were found. In further studies, analogs of the Kulyabskaya Suite were found in separate areas of the Dushanbinsky, South Gissar, and Qarateginsky regions, where their sections and thicknesses are generally similar to those described above (Loziev, 1972). In addition, it was established that in extensive depressions, covered from the surface by Middle Quaternary and younger deposits, the thickness of the Kulyabskaya Suite, exposed only along the sides of the depressions, but penetrated by wells in their central parts, can amount to 1000 m and more. However, the mutual relationship of the Kulyab Fm with older formations remain unclear in these basins.
Age
Depositional setting
Additional Information
In further studies, analogs of the Kulyabskaya Suite were found in separate areas of the Dushanbinsky, South Gissar, and Qarateginsky regions, where their sections and thicknesses are generally similar to those described above (Loziev, 1972). In addition, it was established that in extensive depressions, covered from the surface by Middle Quaternary and younger deposits, the thickness of the Kulyabskaya Suite, exposed only along the sides of the depressions, but penetrated by wells in their central parts, can amount to 1000 m and more. However, the mutual relationship of the Kulab suite with older formations remain unclear in these basins.