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首页> 外文期刊>Doklady Earth Sciences >First Results of the U-Pb Isotopic (LA-ICP-MS) Dating of Detrital Zircons from the Lower Paleozoic of Spitsbergen
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First Results of the U-Pb Isotopic (LA-ICP-MS) Dating of Detrital Zircons from the Lower Paleozoic of Spitsbergen

机译：斯匹次卑尔根下古生界碎屑锆石的U-Pb同位素（LA-ICP-MS）约会的初步结果

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摘要

This work presents the first results of dating of detrital zircons (dZr_s) from the Lower Paleozoic terrigenous-carbonate rocks of the Cambrian Blastertoppen (samples 08-137 and 08-142, south of the Wedel Jarlsberg Land) and Ordovician Wiederfjellet (sample K06-17, north of the Land) sequences, which are widespread to the north and south of the Hornsund Fjord, on the southwestern coast of Spitsbergen Island. Against the background of sporadic values of 1-3 Ga, samples K06-17 and 08-142 showed similar spectra of the age distribution of dZr_s with dominant compact numerous age groups of ～1.8-1.9 Ga and peaks of the maximum of the probability density of 1850 and 1862 Ma, respectively. The only noticeable difference in these spectra is the presence of a young grain of 541 Ma in sample 08-142 (with a very good value of concordance), which is close to the suggested Cambrian age of formation of the Blastertoppen sequence. The distribution of the dZr ages in sample 08-137 is significantly distinct. First, the general age range is narrower: 1.15-1.95 Ga (no Archean ages). Second, the age of 1.8-2.0 Ga dominant in the other two samples corresponds to only one grain. Thus, although samples 08-137 and 08-142 were taken from closely located levels of the section of the Cambrian Blastertoppen sequence (in the same interception), the age spectra of dZr_s from these samples differ cardinally. The statistical Kolmogorov- Smirnov test quantitatively supports the visual similarity of age spectra of dZr_s from samples K06-17 and 08-142 (p = 0.913) and the distinction of those from samples 08-142 and 08-137 (p = 0). Thus, the provenance areas, which supplied the clastic material to the sedimentary basin, whose remnants are presently located in the southwestern part of Spitsbergen, abruptly changed in the Cambrian. The basal levels of the Cambrian section of this basin (sample 08-137) were mostly formed due to accumulation of the erosion products of the local (Spitsbergen) sources: metarocks of the Eimfjellet Group located in the south of the Wedel Jarlsberg Land and of the Smerenburgfjord Group abundant on the Albert I Land. The dZr_s age spectrum is a print of the ages of the Late Paleoproterozoic-Mesoproterozoic (pre-Grenville) basement unaffected by assemblage of Rodinia. Then the conditions changed and the basin became to accumulate the material from the remote regions, significant parts of which were the areas of ancient cratons, including Archean blocks. The general sedimentation conditions did not change considerably, because the rock type remained the same.
机译：这项工作提出了从寒武纪Blastertoppen的下古生界陆源碳酸盐岩（样品位于Wedel Jarlsberg土地以南的08-137和08-142）和Ordovician Wiederfjellet（样品K06-）的碎屑锆石（dZr_s）测年的初步结果。土地以北第17段），分布在斯匹次卑尔根岛西南海岸的霍恩松德峡湾的北部和南部。在1-3 Ga的零星值背景下，样品K06-17和08-142显示了dZr_s年龄分布的相似光谱，具有占主导地位的密集年龄〜1.8-1.9 Ga的多个年龄组，并且最大概率密度峰值分别为1850和1862 Ma。这些光谱中唯一值得注意的差异是样品08-142中存在541 Ma的年轻晶粒（具有非常好的一致性值），这与建议的Blastertoppen序列的寒武纪年龄相近。样品08-137中dZr年龄的分布明显不同。首先，一般年龄范围较窄：1.15-1.95 Ga（没有太古宙时代）。其次，在其他两个样本中占主导地位的1.8-2.0 Ga年龄仅对应一个晶粒。因此，尽管样品08-137和08-142是从寒武纪Blastertoppen序列剖面的紧密定位水平（在相同的截距中）获取的，但这些样品的dZr_s的年龄谱在本质上是不同的。统计Kolmogorov-Smirnov检验定量支持样品K06-17和08-142（p = 0.913）的dZr_s年龄谱的视觉相似性，以及样品08-142和08-137（p = 0）的区别。因此，将碎屑物质提供给沉积盆地的物源地区，其残余物目前位于斯匹次卑尔根州的西南部，在寒武纪突然发生了变化。该盆地寒武纪断层的基础水平（样品08-137）主要是由于当地（Spitsbergen）源的侵蚀产物的堆积而形成的：位于Wedel Jarlsberg Land南部的Eimfjellet组的超岩石和位于阿尔伯特一世土地上的Smerenburgfjord集团。 dZr_s年龄谱是古元古代-中元古代（Grenville之前）基底的年龄的印记，不受罗迪尼亚的组合影响。然后条件发生了变化，盆地开始积聚来自偏远地区的物质，其中大部分是古代克拉通地区，包括太古宙块。由于岩石类型保持不变，所以一般的沉积条件没有太大变化。

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    《Doklady Earth Sciences》 |2014年第1期|259-265|共7页
  • 作者

    N. N. Kosteva; N. B. Kuznetsov; A. M. Tebenkov; T. V. Romanyuk;

  • 作者单位

    Polar Marine Geosurvey Expedition, pr. Pobedy 24, Lomonosov-St. Petersburg, 198412 Russia;

    Geological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017 Russia,Peoples' Friendship University of Russia, ul. Miklukho-Maklaya 6, Moscow, 117198 Russia;

    Polar Marine Geosurvey Expedition, pr. Pobedy 24, Lomonosov-St. Petersburg, 198412 Russia;

    Institute of Physics of the Earth, Gruzinskaya ul. 10/1, Moscow, 123995 Russia,Gubkin Russian State University of Oil and Gas, Leninksii pr. 65, Moscow, 119991 Russia;

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