FACTORS IMPACTING THE ACCURACY OF APATITE(U-TH)/HE DATING

doi:10.3969/j.issn.0253-4967.2016.04.024

Abstract

Abstract:

Apatite (U-Th)/He dating has gained popularity since its rejuvenation as geochronometry and thermochronometry applied in the deduction of the geological processes of the upper-three-km crust.However,this irreplaceable method,which has the lowest known closure temperature (~70℃),sometimes is suffering from large dispersion and deviation because of its dating theory,its analytical method,and its diffusion process.In this paper,we summarized ten factors impacting the accuracy of (U-Th)/He dating.They are grain size,fluid and mineral inclusions,α-particle ejection,α-particle implantation,U-Th zonation,radiation damage,chemical composition,samarium concentration,multiple thermal events,and U-series disequilibrium.We discussed how these ten factors would affect the (U-Th)/He ages and how to reduce and/or avoid the deviation caused by them.The factors of grain size (different size,different diffusion domain) and inclusions (parentless ⁴He) can be suppressed in the procedure of grain selection under binocular.It is the precise measurement of a homogenous crystal that endows the (U-Th)/He dating method credible due to the correction of α-particle ejection based on the dimension of crystals.The possible implantation of α-particles can be evaluated by the negative correlation of age and eU (eU=[U]+0.235[Th]).U-Th zonation,a heterogeneous distribution of parent nuclides,makes the correction of α-particle ejection inaccurate;besides,this factor also amplifies the side effects of radiation damage and grain size.LA-ICP-MS can detect this phenomenon.Radiation damage outstands when the samples experience reheating or long residence time in partial retention zone (40~70℃),indicated by the positive correlation between age and eU/[⁴He].Apatite (U-Th)/He age can be entangled by higher Cl content,with which the crystal accumulates more radiation damage,leading to a larger age,meanwhile this factor needs more investigation.Having larger half-life than U-series nuclides,the ¹⁴⁷Sm is not a big problem in the dating of a large timescale,while more precise event needs the data of ¹⁴⁷Sm in the age calculation.The multiple thermal events should be evaluated to exclude thermal perturbation,when applying the (U-Th)/He geo/thermochronology to the deduction of a particular thermal event.U-series disequilibrium has an impact on the ages smaller than 1Ma,making the age results larger than the true one.U-series disequilibrium method and mineral couples can solve this problem.Inclusion,α-particle ejection and implantation,and U-Th zonation are at the mercy of analytical methods.The factors stemming from helium diffusion in the crystals are grain size,radiation damage,Cl content,multiple thermal events.The dating theory of (U-Th)/He method renders U-series disequilibrium and ¹⁴⁷Sm outstand as side effects in some specific conditions.It would be our pleasure if this paper could provide some useful information for the works relevant to this dating method.

Key words: apatite, (U-Th)/He dating, accuracy, effects

摘要：

磷灰石（U-Th）/He体系因具有已知最低的放射性同位素体系封闭温度（70℃，约3km深度），而被广泛应用于浅地表构造变形及地貌演化研究，是近20a来发展较为迅速的1种热年代学方法。但由于定年原理、测试方法和⁴He扩散特点等诸多因素的限制，该同位素年龄体系的准确度受到了一定程度的制约。文中归纳了现有文献中常见的10类磷灰石（U-Th）/He定年准确度的影响因素，即粒径、包裹体、α粒子射出效应、α粒子植入效应、U-Th成分环带、辐射损伤、磷灰石化学成分、钐含量、多期热事件和铀系不平衡等，并初步探讨了造成偏差的原因和解决方法，用以抛砖引玉，引起相关研究者的考虑和重视。

关键词: 磷灰石, (U-Th)/He年代学, 准确度, 影响因素

CLC Number:

P597

ZHANG Wei-bin, WU Lin, WANG Fei. FACTORS IMPACTING THE ACCURACY OF APATITE(U-TH)/HE DATING[J]. SEISMOLOGY AND GEOLOGY, 2016, 38(4): 1107-1123.

张炜斌, 吴林, 王非. 磷灰石(U-Th)/He年龄准确度的影响因素[J]. 地震地质, 2016, 38(4): 1107-1123.

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