Abstract
article i nfo Diamondbearing kimberlite pipesare exposedacross the north-central part of theSiberianplatform.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, α95=7.4°, N= 14); D=340.5°, I= −65.6° (k=12.9, α95=19.4°, N=6); D=291.1°, I= −78.1° (k=27.5, α95=14.9°, N= 5); and D=306.7°, I=−82.6° (k=38.4, α95=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 pri- marymagnetizationsinthese rocks.The paleomagneticagesare asfollows: 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 clearpaleomagneticage could bedetermined. The agesof magmaticactivity spanthe Early SiluriantoMiddleLate Jurassic.EarlySilurianmagmatismcouldbeassociatedwiththeformation of theViluyrift. MiddletoLateJurassicmagmaticactivityismostlikelyrelatedtosubductionrelatedtotheaccretionofsurround-
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