aariПроблемы Арктики и АнтарктикиArctic and Antarctic Research0555-26482618-6713Государственный научный центр Российской Федерации Арктический и антарктический научно-исследовательский институт10.30758/0555-2648-2019-65-4-449-461aari-220Research ArticleГЕОЛОГИЯ И ГЕОФИЗИКАGEOLOGY AND GEOPHYSICSГабброиды острова Питерман (Западная Антарктида): первые сведения по геохимииGabbroides of Peterman island (West Antarctica). First information on geochemistryАртеменкоГ. В.ArtemenkoG. V.regulgeo@gmail.comГаноцкийВ. И.GanotskiyV. I.Институт геохимии, минералогии и рудообразования НАН УкраиныУкраинаInstitute of Geochemistry, Mineralogy and Ore FormationUkraineНациональный технический университет «Днепровская политехника»УкраинаNational Technical University “Dneprovskaya Polytechnica”Ukraine201919122019654449461Copyright © Артеменко Г.В., Ганоцкий В.И., 20192019Артеменко Г.В., Ганоцкий В.И.Artemenko G.V., Ganotskiy V.I.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.aaresearch.science/jour/article/view/220

В статье представлены результаты геохимических исследований габброидов о. Питерман (Аргентинские острова). С интрузиями габброидов андийского комплекса связаны мелано­габбро-пегматиты и позднемагматические дайки с проявлениями минерализации магнетита, ильменита, сульфидов и повышенные концентрации V, Co и Cu, что представляет интерес как для поисков полезных ископаемых, так и для решения вопроса об их генезисе. Согласно полученным данным, широкий спектр составов габброидов андийского комплекса образовался в результате кристаллизационной дифференциации магмы, выплавленной из пород состава примитивной мантии в коровых магматических камерах, в результате которой осуществлялось и накопление V, Co и Cu в остаточных магматических расплавах.

Peterman Island is located in the archipelago of the Wilhelm Islands on the west coast of the Antarctic Peninsula (Graham Land). It is composed of gabbroids and granitoids of the Andean complex, which formed almost 100 million years later than the volcanic group of the Antarctic Peninsula. To clarify their genesis and geodynamic conditions of formation, gabbroids of the Andean complex are of particular interest, since the petrological models of their formation are well developed. Gabbroid intrusions comprise small bodies that are widespread along the Antarctic Peninsula. Among them stand out olivine gabbros, normal gabbros, norites and hornblende gabbros. Also are found small bodies of melanogabbro-pegmatites and intramagmatic dykes, that are associated with the manifestations of ore mineralization of magnetite, ilmenite and sulfides. For this reason, they are of interest for both the minerals search and for solving the question of their genesis. To this end, we performed geochemical studies of Peterman Island gabbroids. Gabbroids of Peterman Island are represented by amphibolized medium-grained gabbro with hypidiomorphic texture. Among them, xenoliths of thinly stratified gabbroids 3 × 8 m in size were found, which are characteristic of stratified intrusions, for example, Stillwater, Bushveld, etc. Gabbroids of Peterman Island have low content of silica and potassium and according to the petrochemical characteristics correspond to peridotite gabbro. They have low contents of Cr, Ni, V and high strength lithophilic Y and Nb elements. Gabbroids have been crystallized from basic magma, differentiated in the intermediate crustal magma chambers. Positive anomalies of Sr, Eu, and Ti in the multielement diagrams and positive anomalies of europium Eu/Eu* suggest the accumulation of plagioclase and apparently, ilmenite in the magmatic chamber. The primary magma source for gabbroids was probably the primitive mantle (PM). Gabbroids are contaminated with crustal matter. This contamination is probably due to their regressive metamorphism, caused by the introduction of later intrusions of Andean complex granitoid. Finely layered xenolithic gabbroids do not differ from other homogeneous gabbros of Peterman Island in terms of chemical composition.This xenolith most likely represents a part (fragment) of the wall of the magma chamber in which the differentiation of the initial main magma took place. According to the obtained geochemical data, a wide range of compositions of the Andean complex gabbroids formed as a result of crystallization differentiation of magma melted from rocks of the composition of the primitive mantle (PM) in crustal magma chambers, which also resulted in the accumulation of ore elements — V, Co, and Cu in the residual magmatic melts.

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