Коллапс-брекчии как признак былого присутствия эвапоритов (саткинская свита нижнего рифея, Южный Урал)

M. T. Krupenin

Аннотация


На примере саткинской свиты нижнего рифея показано былое присутствие эвапоритовых отложений в составе карбонатных пачек. Доказательством является широкое развитие брекчий обрушения в карагайской пачке верхнесаткинской подсвиты. Приведены признаки отличия коллапс-брекчий от других осадочных брекчий и предложен механизм их образования с участием процессов биосульфатредукции. Бактериальное разложение сульфатов в диагенезе приводило к снижению концентрации сульфат-иона в поровых водах и тотальному растворению скоплений гипса и ангидрита с формированием горизонтов брекчий обрушения. Низкий уровень оксигенизации в мезопротерозое способствовал широкому проявлению биосульфатредукции даже в фотической зоне мелководных лагун при условии низкой гидродинамической активности.

Ключевые слова


коллапс-брекчия; доломит; гипс; рифей; эвапорит; биосульфатредукция

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Литература


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DOI: http://dx.doi.org/10.17072/psu.geol.17.4.342

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