High-grade metamorphic rocks in Instekleppane, Lützow-Holm Complex, east Antarctica: A potential new locality of ultrahigh-temperature (UHT) metamorphic rocks

IF 1.7 4区地球科学 Q3 ECOLOGY

Polar Science Pub Date : 2025-12-01 Epub Date: 2025-08-19 DOI:10.1016/j.polar.2025.101263

Tatsuro Adachi , Lakshmanan Sreehari , Yuki Mori , Tomokazu Hokada

引用次数: 0

Abstract

The first comprehensive multi-day geological survey was conducted at Instekleppane in the southern part of the Lützow-Holm Complex, East Antarctica, by the 65th Japanese Antarctic Research Expedition (JARE65). This exposure is predominantly composed of felsic orthopyroxene-biotite gneiss, leucocratic garnet-biotite gneiss, granitic biotite gneiss, and felsic garnet-orthopyroxene-biotite gneiss with intercalations of mafic granulites, meta-ultramafic rocks, and Mg–Al-rich rocks. Several Mg–Al-rich rocks, such as sapphirine-cordierite-biotite gneiss and garnet-sapphirine-orthopyroxene-cordierite gneiss, have reaction textures indicating decompression under ultrahigh-temperature (UHT) conditions. Similar lithological relations and metamorphic signatures have been reported from Rundvågshetta, suggesting a possible geological linkage between these exposures.

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南极洲东部l zow- holm杂岩Instekleppane的高品位变质岩：一个潜在的超高温变质岩新址

第65次日本南极研究考察队（JARE65）在东南极洲l佐-霍尔姆复合体南部的Instekleppane进行了第一次为期数天的综合地质调查。该出露主要由长英质正辉长岩-黑云母片麻岩、白晶质石榴石-黑云母片麻岩、花岗质黑云母片麻岩和长英质石榴石-正辉长辉长岩-黑云母片麻岩组成，其间嵌有基性麻粒岩、超镁铁质岩和富镁铝岩。一些富镁铝的岩石，如蓝宝石-堇青石-黑云母片麻岩和石榴石-蓝宝石-正辉石-堇青石片麻岩，具有反应结构，表明在超高温（UHT）条件下减压。类似的岩性关系和变质特征在rundv gshetta也有报道，表明这些暴露物之间可能存在地质联系。

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来源期刊

Polar Science ECOLOGY-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

3.90

自引率

5.60%

发文量

期刊介绍： Polar Science is an international, peer-reviewed quarterly journal. It is dedicated to publishing original research articles for sciences relating to the polar regions of the Earth and other planets. Polar Science aims to cover 15 disciplines which are listed below; they cover most aspects of physical sciences, geosciences and life sciences, together with engineering and social sciences. Articles should attract the interest of broad polar science communities, and not be limited to the interests of those who work under specific research subjects. Polar Science also has an Open Archive whereby published articles are made freely available from ScienceDirect after an embargo period of 24 months from the date of publication. - Space and upper atmosphere physics - Atmospheric science/climatology - Glaciology - Oceanography/sea ice studies - Geology/petrology - Solid earth geophysics/seismology - Marine Earth science - Geomorphology/Cenozoic-Quaternary geology - Meteoritics - Terrestrial biology - Marine biology - Animal ecology - Environment - Polar Engineering - Humanities and social sciences.