The alkaline igneous rocks of the Chompolo field (Aldan shield, Siberian craton), previously defined as kimberlites or lamproites, are more correctly classified as low-Ti lamprophyres. The emplacement age of the Ogonek pipe (137.8 ± 1.2 Ma) and the Aldanskaya dike (157.0 ± 1.6 Ma) was obtained using ⁴⁰Ar/³⁹Ar K-richterite dating. The Chompolo rocks contain abundant xenocrysts of mantle minerals (chromium-rich pyropic garnets, Cr-diopsides, spinels, etc.). The composition of the mantle xenocrysts indicates the predominance of spinel and garnet–spinel lherzolites, while the presence of garnet lherzolites, dunites, harzburgites, and eclogites is minor. The Chompolo rocks are characterized by large-ion lithophile element (LILE) and Light Rare Earth Element (LREE) enrichments, and high field strength element (HFSE) depletions. The rocks of the Ogonek pipe have radiogenic Sr (⁸⁷Sr/⁸⁶Sr (t) = 0.70775 and 0.70954), and highly unradiogenic εNd_(t) (−20.03 and −20.44) isotopic composition. The trace element and isotopic characteristics of the Chompolo rocks are indicative of the involvement of subducted materials in their ancient enriched lithospheric mantle source. The Chompolo rocks were formed at the stage when the Mesozoic igneous activity was triggered by global tectonic events. The Chompolo field of alkaline magmatism is one of the few available geological objects, which provides the opportunity to investigate the subcontinental lithospheric mantle beneath the south part of the Siberian craton.

中文翻译：

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Chompolo田地的煌斑岩的40Ar / 39Ar地质年代学和新的矿物学和地球化学数据（俄罗斯南雅库特）

Chompolo场的碱性火成岩（Aldan盾，西伯利亚克拉通）以前被定义为金伯利岩或斑岩，可以更正确地归类为低Ti斑岩。使用⁴⁰ Ar / ³⁹获得Ogonek管（137.8±1.2 Ma）和Aldanskaya堤（157.0±1.6 Ma）的安装年龄。Ar K-richterite约会。Chompolo岩石含有丰富的地幔异种（富铬的石榴石，Cr-二叠氮化物，尖晶石等）。地幔异晶的组成表明，尖晶石和石榴石-尖晶石型锂铁矿占主导地位，而石榴石形锂铁矿，榴辉石，尖晶石和榴辉岩的存在很小。Chompolo岩石的特征是大离子的亲石元素（LILE）和轻稀土元素（LREE）富集，以及高场强元素（HFSE）耗尽。Ogonek管道的岩石具有放射性Sr（⁸⁷ Sr / ⁸⁶ Sr（t）= 0.70775和0.70954）和高度非放射性εNd _（t）（-20.03和-20.44）同位素组成。Chompolo岩石的痕量元素和同位素特征表明，俯冲物质参与了其古老的丰富的岩石圈地幔源。Chompolo岩石形成于全球构造事件触发中生代火成活动的阶段。碱性岩浆作用的Chompolo场是为数不多的可用地质对象之一，这为研究西伯利亚克拉通南部下方的亚大陆岩石圈地幔提供了机会。