Яндекс.Метрика

С.С.Сухорукова,С.Л.Афанасьев, А.Я. Шевко

Выпуск: 5 , Том: 34 , Год издания: 1993
Сериальное издание: Геология и геофизика
Страницы: 61-67

Аннотация

The layers of horizontally-bedding warves with 8-18 m thickness, which occur inside or above the moraine and are overlapped by peat bogs and paleosoils, have been studied. They consist of fine sand laminas, aleurites, silts, and clays forming annual cyclites having the thickness of 10-70 mm and more. The following analyses of laminas have been made: granulometrical mineralogical, thermal, roentgenostructural. In addition, we studied the structures, textures, and composition of the rocks in thin sections. The total thickness of silt and clay laminas decreases and average calcite content increases from 3.7 to 4.1 and 4.7% synchronously with warming of climate and change of conditions of glaciolacustrine sedimentation from top to bottom of the section. The age of lenticular clays is limited above by radiocarbonic data, while at the bottom - by thermoluminescent ones, which are 33 ± 8 Ta and 154 ± 36 Ta, respectively. Based on field measurements of thickness of laminas, S.L. Afanasiev has calculated the age of lenticular clays (146.06-149.48 Ta) by his own nanocyclitic method (1989), that corresponds to the regression time of the Tazovsky glacier cover (Middle Pleistocene) in West Siberia and 6-th isotopic-oxygenic stage. The local sedimentation "clock" of the Tazovsky nearglacier basin showed its short-term existence (only 2200 years) and superhigh rates of sedimentation of glaciolacustrine and lacustrine deposits. The superhigh rates of seasonal sedimentation in the lacustrine paleobasin evidence about the neocatastrophical environment alterations, impulseness of sedimentation process in the Pleistocene late-glacial intervals and illegality of using the average sedimentation rates for determination of age of Quaternary sediments.
индекс в базе ИАЦ: 013372