litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2019-19-3-416-435litosphere-1177Research ArticleСтатьиArticlesРаспределение хрома в минералах высокомагнезиальных пород, ассоциированных с гранитоидными массивами УралаGeochemical behavior of chromium in minerals of high-Mg rocks, associated with granitoid massifs of the UralsПрибавкинС. В.PribavkinS. V.

620016, Екатеринбург, ул. Акад. Вонсовского, 15

Sеrgei V. Pribavkin

15 Akad. Vonsovsky st., Ekaterindurg, 620016

pribavkin@igg.uran.ruКаллистовГ. А.КallistovG. A.

620016, Екатеринбург, ул. Акад. Вонсовского, 15

Gennady А. Кallistov

15 Akad. Vonsovsky st., Ekaterindurg, 620016

ОсиповаТ. А.ОsipovaТ. A.

620016, Екатеринбург, ул. Акад. Вонсовского, 15

Тatiana А. Оsipova

15 Akad. Vonsovsky st., Ekaterindurg, 620016

ГоттманИ. А.GottmanI. A.

620016, Екатеринбург, ул. Акад. Вонсовского, 15

Irina А. Gottman

15 Akad. Vonsovsky st., Ekaterindurg, 620016

ЗиньковаЕ. А.Zin’kovaE. A.

620016, Екатеринбург, ул. Акад. Вонсовского, 15

Еlena А. Zin’kova

15 Akad. Vonsovsky st., Ekaterindurg, 620016

Институт геологии и геохимии, УрО РАНРоссияA.N. Zavaritsky institute of Geology and Geochemistry, Urals Branch of RASRussian Federation201909072019193416435Copyright © Прибавкин С.В., Каллистов Г.А., Осипова Т.А., Готтман И.А., Зинькова Е.А., 20192019Прибавкин С.В., Каллистов Г.А., Осипова Т.А., Готтман И.А., Зинькова Е.А.Pribavkin S.V., Кallistov G.A., Оsipova Т.A., Gottman I.A., Zin’kova E.A.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/1177Объект исследований

Объект исследований. Высокомагнезиальные породы, ассоциированные с гранитоидными массивами Урала, представлены габбродиоритами и их меланократовыми разностями (горнблендитами), диоритами, кварцевыми диоритами, сложенными порфирокристами амфибола, часто совместно с клинопироксеном и флогопитом в базисе из кислого плагиоклаза с интерстициальными кварцем и калиевым полевым шпатом. Уникальной особенностью пород, помимо высокой магнезиальности, равной 0.5-0.8 ед., является экстремально высокое содержание хрома, достигающее 1200 г/т.

Методы

Методы. Исследование состава высокомагнезиальных пород выполнено на масс-спектрометре с индуктивно связанной плазмой ELAN 9000, электронно-зондовом микроанализаторе Самеса SX-100 и энергодисперсионной приставке INCA Energy 450 X-Max 80. Предел обнаружения Cr2O3 на микроанализаторе составляет 0.05, на ЭДС приставке - 0.2 мас. %.

Результаты

Результаты. Установлено различие в поведении хрома в двух главных минеральных ассоциациях, связанных с магматическими и постмагматическими процессами. Средняя концентрация оксида хрома в минералах ранней ассоциации по разным образцам составляет, мас. %: 0.10-0.50 - в клинопироксене, 0.29-0.68 - в амфиболе, 0.08-0.36 - во флогопите при их вариациях от 0.0 до 1.6. В состав поздней ассоциации входят минералы, представляющие собой продукты постмагматического преобразования пироксенов, глиноземистого амфибола в низкоглиноземистую магнезиальную роговую обманку, актинолит, титанит, эпидот, мусковит. Преобразование хромшпинелида на этой стадии сопровождалось обменными процессами с силикатами, в результате которых последние были обогащены хромом. Средняя концентрация оксида хрома в минералах ассоциации составляет, мас. %: 0.24-0.80 - в амфиболе, 1.38-3.08 - в эпидоте, 1.03 - в титаните, 3.5 - в мусковите.

Заключение

Заключение. Предполагается, что кристаллизация ранней ассоциации железомагнезиальных силикатов проходила из водных высокомагнезиальных расплавов. Последующее постмагматическое изменение таких силикатов привело к развитию фаз с близким, а иногда и более высоким содержанием хрома, что можно объяснить их взаимодействием с хромитом в условиях низкой окисленности флюида, недостаточной для образования магнетита.

Research subject

Research subject. High-magnesium rocks associated with the granitoid massifs of the Urals are represented by gabbro-diorites and their melanocratic varieties (hornblendites), as well as by diorites and quartz diorites. These rocks are composed of amphibole porphyrocrists frequently combined with clinopyroxene and phlogopite immersed in a basis of acid plagioclase with interstitial quartz and potassium feldspar. In addition to a high magnesium content of 0.5–0.8 units, these rocks are characterized by extremely high chromium contents of up to 1200 ppm.

Methods

Methods. The study of the composition of high-magnesium rocks was performed using an ELAN 9000 inductively coupled plasma mass spectrometer, an SX-100 Cameca electron probe microanalyzer and an energy dispersive device INCAEnergy 450 X-Max 80. The detection limit for Cr2O3 was equal to 0.05 wt. % and 0.2 wt. % for the microanalyzer and the energy dispersive device, respectively. 

Results

Results. The two main mineral associations related to magmatic and post-magmatic processes are found to be different in terms of chromium behaviour. The average concentrations of chromium oxide in the minerals from the magmatic association varied within the range (wt. %) of 0.10–0.50, 0.29–0.68, 0.08-0.36 and 0.0–1.6 for different samples of clinopyroxene, amphibole, phlogopite and their variations, respectively. The post-magnetic association included minerals representing the products of postmagmatic (hydrothermal) transformation of pyroxenes and alumina amphibole into low-alumina magnesia hornblende, actinolite, titanite, epidote and muscovite. The transformation of chromospinelide at this stage had been accompanied by exchange processes with silicates, as a result of which the silicates were enriched with chromium. The average concentrations of chromium oxide in the minerals of this association were (wt. %) 0.24–0.80, 1.38–3.08, 1.03 and 3.5 in the samples of amphibole, epidote, titanite and muscovite, respectively.

Conclusion

Conclusion. It is assumed that the crystallization of the early association of iron-magnesium silicates proceeded from aqueous high-magnesium melts. The subsequent post-magmatic change of such silicates led to the development of phases with a similar and occasionally higher chromium content. This fact can be explained by the interaction of silicates with chromite under the conditions of low fluid oxidation, which was insufficient for the formation of magnetite.

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The authors declare that there are no conflicts of interest present.