Sr-bearing phosphates of the apatite supergroup from the alkaline rocks of the Konder pluton, Khabarovsk Krai-Reference-Cited by-同舟云学术

Sr-bearing phosphates of the apatite supergroup from the alkaline rocks of the Konder pluton, Khabarovsk Krai

Published:2021-12 Issue: Volume: Page:46-59
ISSN:
Container-title:МИНЕРАЛОГИЯ (MINERALOGY)
language:ru
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Author:

Osipov A.S.¹,Antonov A.A.²,Vlasenko N.S.¹

Affiliation:

1. St. Petersburg State University, St. Petersburg, Universitetskaya nab. 7-9, 199034 Russia

2. Karpinsky Russian Geological Research Institute (VSEGEI), St. Petersburg, Sredny pr. 74, 199016 Russia

Abstract

The paper presents a mineralogical description of Sr-bearing phosphates of the apatite supergroup found in eudialyte-aegirine-albite rocks of the Konder pluton, Khabarovsk krai. The Sr-dominant phases are associated with minerals of the lamprophyllite group and titanite, whereas the Ca-dominant phases are associated with calciocatapleite and kainosite-(Y), which are the products of the decomposition of eudialyte. The phosphates probably formed during post-magmatic alteration of host rock in a following sequence: stronadelphite > fuorostrophite > Sr-rich fuorapatite (fuorocaphite) > Na-REE-fuorapatite. Their variable chemical composition indicates decreasing Sr, Ba and F contents and increasing Ca, Na, REE and (OH) contents during crystallization. The crystallization sequence could refect a decrease in alkalinity of the mineral-forming conditions. Keywords: stronadelphite, fuorostrophite, fuorocaphite, Sr-rich fuorapatite, fuorapatite, alkaline rocks, hydrothermal alterations, Konder pluton, alkaline-ultramafc complexes.

Publisher

South Urals Federal Research Center for Mineralogy and Geoecology of the Urals Branch of the RAS

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