Пузыристые лавы алмазопродуктивного Толбачинского трещинного извержения 2012–2013 гг. (ТТИ-50, Камчаткa)

V. I. Silaev, L. P. Anikin, G. A. Karpov, D. N. Remizov, A. S. Myandin, V. N. Filippov, A. F. Khazov, V. P. Lyutoev, D. V. Kiseleva

Аннотация


Обобщены результаты комплексных петрологических, геохимических и минералогических исследований эффузивных вулканитов алмазопродуктивного Толбачинского Трещинного извержения 2012–2013 гг. (ТТИ-50). Сделан вывод о двухфазности извержения, начавшегося эрупцией трахиандезибазальтов, кратковременно сменившихся трахибазальтами. В сравнении с лавами других Толбачинских извержений (БTТИ) исследованные вулканиты характеризуются большей щелочностью, высокой калиевостью (до шошонитов), но меньшей магнезиальностью. По геохимическим свойствам они соответствуют рифтогенным магматитам, образовавшимся за счет глубинно-мантийного очага магмы пикритового состава. Исследованные вулканиты характеризуются широко варьирующейся везикулярностью вплоть до пузыристых лав, на 80–90 % состоят из вулканического стекла, степень раскристаллизации которого колеблется от максимальной в эффузивных трахиандезибазальтах до минимальной в бомбе трахиандезибазальта. По степени окисленности железа в стеклофазе вулканиты отвечают продуктам наземных извержений в островодужной или континентально-рифтовой геодинамической обстановке. Среди микролитов преобладают оливин состава Fo56–84, плагиоклазы состава An87±9 Ab9±10 Ort4±2 и шпинелидные твердые растворы на основе магнетита, магноферрита, ульвита и купрошпинели. Индивиды распада в фазово-гетерогенных зернах магнетита представлены гемоильменитом и ильменитом. В качестве акцессорных минералов-микролитов установлены джирит-спионкопит состава Cu1.7S–Cu1.32S, самородное железо состава Fe75Sn4(Cu,Mn,Cr) и самородная медь состава Cu7–10(Sn0.9–1.8Fe0.1–0.2)1–2.


Ключевые слова


Толбачинское трещинное извержение; эффузивы; петро-минералого-геохимические свойства

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Литература


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DOI: http://dx.doi.org/10.17072/psu.geol.21.3.193

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(c) 2022 V. I. Silaev, L. P. Anikin, G. A. Karpov, D. N. Remizov, A. S. Myandin, V. N. Filippov, A. F. Khazov, V. P. Lutoev, D. V. Kiseleva

URL лицензии: http://creativecommons.org/licenses/by/3.0/