D.k.zhdanov Youth Ecological Group Of Odessa Regional Academy Of Sciences (yegoran), Ukraine
GYPS CONTENT OF NEOCENE-QUATERNARY DEPOSITS OF NORTH-WESTERN BLACK SEA COAST
D.K.Zhdanov
Youth Ecological Group of Odessa Regional Academy of Sciences (YEGORAN), Ukraine
The paper is dedicated to the research of vertical sections of Neocene-Quaternary deposits of the North-western Black Sea Coast, the properties and display of gyps content, its stratigraphic distribution. It should be noted that this problem has never been discussed before, and no publications were found.
As a result of detailed examination of the vertical sections of Neocene-Quaternary deposits in the named region the display of gyps content was registered in 13 locations (fig.1): Krizhanovka (2 points), "Delfin" beach, "Arcadia" beach, "Dacha Kovalevskogo" beach, Chernomorka (3 points), Sukhoi estuary, Khadjibeyevsky estuary (3 points), Krasnosyolka, Kuyalnik estuary. On these points the gyps is presented in the forms of separate monocrystals, druses, doubles and contractions, i.e. gyps as solid rock is not found.
The Neocene-Quaternary deposits in the region can be divided into four main gyps-containing horizons (fig.2): green clay (Miocene), marl (Pliocene), brown-red clay (Pliocene) and loess loam (Pleistocene). The majority of gyps formations was found in brown-red Pliocene clay, which are available in all gyps-containing points. Less content of gyps formation is noted in green Miocene clay, which are slightly present in coastal expositions. Marl and loess loam are inconsiderable in gyps content.
We assume that the formation of gyps on the observed territory took place in the post-sedimentary stage of deposit accumulation in the course of evaporation mineral formation during the drainage of sea lagoons and major salt lakes (primary gyps). The secondary gyps formed by means of recrystallisation of the primary one.
Figure1
1 — Krizhanovka‑1
2 — Krizhanovka‑2
3 — "Delfin" beach
4 — "Arcadia" beach
5 — "Dacha Kovalevskogo" beach
6 — Chernomorka‑1
7 — Chernmorka‑2
8 — Chernomorka‑3
9 — Sukhoi estuary
10 — Krasnosyolka village
11 — Khadjibeyevsky estuary‑1
12 — Khadjibeyevsky estuary‑2
13 — Khadjibeyevsky estuary‑3
Figure2. Stratigraphic characteristics of Neocene-Quaternary deposits of Northern-western Black Sea coast
Era
System
Period
Layer
Symbol
Height, m
Rocks
Cainozoic
Quaternary
Holocene
0.1–1.0
Soil
Pleistocene
4.0–20.0
Loess loam
Neocene
Pliocene
Kuyalnik
1.0–5.0
Green clay
Pontic
4.5–19.0
Brown-red clay
1.0–4.0
Marl
4.0–16.0
Lime
Miocene
Meiotic
1.0–3.0
Green clay
>2
Blue clay
The collection of gyps crystals (over 2000 samples) allows us to study the morphology and propose the classification of the gyps crystals of North-western Black Sea coast (fig.3). The wide variety of crystal forms (13 types) stipulates the mineralogical interest to the gyps content of the observed region.
Figure3. Classification of gyps formations
GYPS
Mono-crystals
Doubles
Aggregates
Normal Binary
Shields
Tables
Columns
Druse
Contraction
Parallel structures
Pseudo-hexagonal
Oblong {2}
Flat {010}
Flat {2}
Carbonate
Clay
Lens-form
Plate-form
Pseudo-octaedric
The gyps content of Neocene-Quaternary deposits of the North-western Black Sea coast can be of practical use too, for instance, for amelioration of ecological and medical situation of the region, as gyps reduced radioactivity of the rocks. In the places, where gyps shield is present, the radioactivity of the soil is 30-35 units lower (measurement were made using device "RA‑69"). Therefore, it is advisable to mind the gyps content while planing the location of future recreation facilities. The considerable Pleistocene deposits can be found using the method of structural-facial analysis and drilling. The artificial gyps formation to reduce radioactivity can also be offered. In order to solve these problems the corresponding material and technical basis is required. In the nearest future we are planning to conduct a series of practical researches to substantiate the proposed use of gyps layers in solving of the ecological and medical problems of the Black Sea coast.
References
1. BudnikovP.P., Gyps and its Study. USSR Academy of Sciences, 1933 (in Russian).
2. GorelovM.V., ZheldanovM.Ch., The Search for Gyps Deposits in Quaternary Layers of Southern Regions of Russian Federation Using Radiometric Method. Moscow, 1967. (in Russian)
3. PerelmanA.I., Geochemistry. Moscow, 1989 (in Russian).
4. SulimovI.K., Geology of the Ukrainian Black Sea Coast. Kiev‑Odessa, 1984 (in Ruussian).
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