Abstract The Permian–Triassic is a critical period for interpreting and understanding the development of West Antarctica and its correlations into Patagonia, South America. The Antarctic Peninsula preserves isolated outcrops of Permian–Triassic age magmatic and metamorphic rocks of granodiorite, orthogneiss, paragneiss and migmatites. Outcrops from the eastern margin of the Antarctic Peninsula (Eastern Domain) have the strongest affinity with continental Gondwana, and have igneous zircons with initial eHf values ranging from −2.8 to −21.6, and δ18O from 10.5 to 5.6‰. These values record a strong sedimentary influence on the magma source and imply crustal recycling. This is in concert with the extensive inherited zircon components that record late Mesoproterozoic–early Neoproterozoic ages, Cambrian and older Permian ages. U–Pb zircon ages for a ca. 202 Ma orthogneiss from the western Antarctic Peninsula (Central Domain) record the presence of a Permian protolith with zircon overgrowth at ca. 222 Ma due to partial melting. These zircon rims have initial eHf values of +1.5 to −0.9 and δ18O of 5.3 to 4.2‰, similar to those determined for the cores. This indicates that the new zircon crystallised from dissolution of partly dissolved cores. Our new data indicate strong similarities between the Eastern Domain of the Antarctic Peninsula and the southern tip of Patagonia, supporting a continuation of both areas, without the need for a great degree of geographical overlap during the Permian and Triassic.

中文翻译：

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锆石O和Hf同位素对南极半岛二叠纪-三叠纪岩浆变质岩成因的约束及其与巴塔哥尼亚的相关性

摘要 二叠纪-三叠纪是解释和理解南极西部的发展及其与南美洲巴塔哥尼亚的相关性的关键时期。南极半岛保留了二叠纪-三叠纪岩浆岩和花岗闪长岩、正片麻岩、副片麻岩和混合岩变质岩的孤立露头。南极半岛东缘（东域）露头与冈瓦纳大陆亲和性最强，有火成岩锆石，初始eHf值为-2.8～-21.6，δ18O为10.5～5.6‰。这些值记录了对岩浆源的强烈沉积影响，并暗示地壳循环。这与记录中元古代晚期 - 新元古代早期、寒武纪和二叠纪晚期的广泛继承的锆石成分一致。U-Pb 锆石老化约 来自南极半岛西部（中央域）的 202 Ma 正方麻岩记录了二叠纪原岩的存在，其中锆石过度生长在约 由于部分熔化，222 Ma。这些锆石边缘的初始 eHf 值为 +1.5 至 -0.9，δ18O 值为 5.3 至 4.2‰，与为核确定的值相似。这表明新锆石是从部分溶解的岩心的溶解中结晶出来的。我们的新数据表明，南极半岛东域和巴塔哥尼亚南端之间有很强的相似性，支持这两个区域的延续，而在二叠纪和三叠纪期间不需要很大程度的地理重叠。这些锆石边缘的初始 eHf 值为 +1.5 至 -0.9，δ18O 值为 5.3 至 4.2‰，与为核确定的值相似。这表明新锆石是从部分溶解的岩心的溶解中结晶出来的。我们的新数据表明，南极半岛东域和巴塔哥尼亚南端之间有很强的相似性，支持这两个区域的延续，而在二叠纪和三叠纪期间不需要很大程度的地理重叠。这些锆石边缘的初始 eHf 值为 +1.5 至 -0.9，δ18O 值为 5.3 至 4.2‰，与为核确定的值相似。这表明新锆石是从部分溶解的岩心的溶解中结晶出来的。我们的新数据表明，南极半岛东域和巴塔哥尼亚南端之间有很强的相似性，支持这两个区域的延续，而在二叠纪和三叠纪期间不需要很大程度的地理重叠。