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首页> 外文期刊>Journal of Applied Geophysics >Paleomagnetic dating of Phanerozoic kimberlites in Siberia
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Paleomagnetic dating of Phanerozoic kimberlites in Siberia

机译：西伯利亚生代金伯利岩的古磁性测年

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Diamond bearing kimberlite pipes are exposed across the north-central part of the Siberian platform. Three main time intervals are considered to be the age of emplacement: the Devonian-Early Carboniferous, Triassic, and Cretaceous. However, isotopic age data from of the pipes are scattered and provide a very broad age interval for the magmatic activity. New paleomagnetic poles from four kimberlite pipes (Eastern Udachnaya, Western Udachnaya, International and Obnazhennaya) are obtained to estimate their paleomagnetic age. The mean primary magnetization directions for the pipes are as follows: D=4.3°, I=?44.5° (k=29.4, α_(95)=7.4°, N=14); D=340.5°, I=?65.6° (k=12.9, α_(95)=19.4°, N=6); D=291.1°, I=?78.1° (k=27.5, α_(95)=14.9°, N=5); and D=306.7°, I=?82.6° (k=38.4, α_(95)=5.8°, N=17), respectively. On the basis of a comparison with the Siberian apparent polar wander path (APWP) we estimate the age of kimberlite magmatism, assuming primary magnetizations in these rocks. The paleomagnetic ages are as follows: 428±13 Ma for Eastern Udachnaya; 251±30 Ma for International pipe; and 168±11 Ma for Obnazhennaya pipe. The Western Udachnaya pipe was remagnetized and no clear paleomagnetic age could be determined. The ages of magmatic activity span the Early Silurian to Middle Late Jurassic. Early Silurianmagmatismcould be associatedwith the formation of the Viluy rift. Middle to Late Jurassic magmatic activity ismost likely related to subduction related to the accretion of surrounding terranes to Siberia.
机译：带有金刚石的金伯利岩管暴露在西伯利亚平台的中北部。三个主要时间间隔被认为是侵占年龄：泥盆纪-早期石炭纪，三叠纪和白垩纪。但是，来自管道的同位素年龄数据是分散的，并为岩浆活动提供了非常宽的年龄间隔。从四个金伯利岩管道（东Udachnaya，Udachnaya西部，International和Obnazhennaya）获得了新的古磁极，以估算其古磁年龄。管道的平均一次磁化方向如下：D ＝ 4.3°，I ＝α44.5°（k ＝ 29.4，α_（95）＝ 7.4°，N ＝ 14）; D ＝ 340.5°，I ＝α65.6°（k ＝ 12.9，α_（95）＝ 19.4°，N ＝ 6）; D ＝ 291.1°，I ＝α78.1°（k ＝ 27.5，α_（95）＝ 14.9°，N ＝ 5）; D ＝ 306.7°，I ＝α82.6°（k ＝ 38.4，α_（95）＝ 5.8°，N ＝ 17）。在与西伯利亚视极极地游走路径（APWP）进行比较的基础上，假设这些岩石的主要磁化强度，我们估计了金伯利岩岩浆作用的年龄。古磁时代如下：东乌达奇纳亚为428±13 Ma。国际管道为251±30 Ma; Obnazhennaya管为168±11 Ma。 Udachnaya西部管道已被磁化，无法确定明确的古磁性年龄。岩浆活动的年龄跨越志留纪早期到侏罗纪中晚期。志留纪早期岩浆作用可能与维鲁裂谷的形成有关。侏罗纪中至晚期的岩浆活动很可能与俯冲有关，而俯冲与周围地层向西伯利亚的吸积有关。

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