西伯利亚克拉通CHADOBETS碱性超镁质碳酸盐杂岩年代学:新的U-Pb和Ar-Ar资料

Pub Date : 2021-12-14 DOI:10.5800/gt-2021-12-4-0559

I. Prokopyev, A. Doroshkevich, A. Malyutina, A. Starikova, A. Ponomarchuk, D. Semenova, S. A. Kovalev, I. A. Savinsky

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引用次数: 3

摘要

Chadobets碱性超镁质碳酸盐岩杂岩位于二叠纪-三叠纪地幔柱活动南界的西伯利亚克拉通上。Chuktukon杂岩碳酸盐岩风化壳中的异种锆石测年结果显示，其年龄分别为1870 ~ 1820、495 ~ 385、290 ~ 210和215 ~ 162 Ma。前两组对应古元古代花岗岩类岩浆活动和古生代碱性基性构造岩浆活动的年代，广泛分布于西伯利亚克拉通及其南部架架。Chadobets杂岩碱性岩的结晶年龄在255 ~ 240 Ma之间。楚克图孔杂岩的辉长岩和碳酸盐矿物的Ar-Ar定年分别在250.5±3.7 Ma和247.1±5.7 Ma之间。根据Ar-Ar测年结果，Terina杂岩的黑绿岩和碎长岩的结晶年龄分别为257.4±3.9 Ma、241.1±3.7 Ma和240±3.6 Ma。Chuktukon杂岩碳酸盐岩风化壳锆石的年龄区间为215 ~ 162 Ma，反映了叠合作用的年代学，反映了Chadobets杂岩火成岩蚀变的不同阶段。Chadobets杂岩碱性岩的结晶年龄与西伯利亚大火成岩省(LIP)内地幔柱活动的年龄区间一致。

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GEOCHRONOLOGY OF THE CHADOBETS ALKALINE ULTRAMAFIC CARBONATITE COMPLEX (SIBERIAN CRATON): NEW U-Pb AND Ar-Ar DATA

The Chadobets alkaline ultramafic carbonatite complex is located on the Siberian craton within the southern boundary of the Permian-Triassic plume activity. The dating of xenogenic zircons from the weathering crust of carbonatites of the Chuktukon complex yielded four clusters with ages of 1870–1820, 495–385, 290–210 and 215–162 Ma. The first two clusters correspond to the dates of activity of Paleoproterozoic granitoid magmatism and Paleozoic alkaline-mafic tectono-magmatic activity, widely occurred in the Siberian craton and its southern framing. The age of crystallization of alkaline rocks of the Chadobets complex falls within the interval of 255–240 Ma. Ar-Ar dating of damtjernite and carbonatite minerals of the Chuktukon complex falls within the intervals of 250.5±3.7 and 247.1±5.7 Ma, respectively. The crystallization ages of the mela-aillikites and damtjernites of the Terina complex, according to the Ar-Ar dating, correspond to the intervals of 257.4±3.9, 241.1±3.7, and 240±3.6 Ma. The age interval of 215–162 Ma based on zircons from the carbonatite weathering crust of the Chuktukon complex reflects the geochronology of superimposed processes and indicates the different stages of alteration of igneous rocks of the Chadobets complex. The data obtained on the age of crystallization of alkaline rocks of the Chadobets complex are consistent with the age interval of Siberian plume activity within a large igneous province (LIP).

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