Thermal evolution and sintering of chondritic planetesimals II. Improved treatment of the compaction process
Thermal evolution and sintering of chondritic planetesimals II. Improved treatment of the compaction process
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球粒状星子的热演化和烧结 II。
DOI：
10.1051/0004-6361/201424278
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
M. Trieloff
中科院分区：
文献类型：
--
作者：
H. Gail;S. Henke;M. Trieloff
对属于同一母体的单个陨石的热历史进行重建，可以得出母体的一般特征，这对行星的形成过程具有重要的线索。这就需要建立这样的模型：用短寿命的放射性物质（尤其是26Al）加热这些天体，并通过热传导冷却它们，然后将其与陨石的冷却历史进行比较。星子材料的导热性主要取决于球粒材料的孔隙率，并随着材料在高温高压下烧结而发生变化。粒状物质的压实是陨石母体热历史的关键过程。通过应用最初为冶金过程中的热等静压开发的概念，改进了压实过程的建模。它被扩展为基体和球粒的二元混合物，正如在球粒陨石中观察到的那样。通过与已发表的烧结实验数据的比较，表明该算法可以充分准确地模拟硅酸盐材料的压实。结果表明，基体和球粒为主的前驱体材料发生烧结的特征温度不同。我们应用新方法模拟了H球粒陨石母体的热演化过程，并确定了一组改进的优化模型参数。
Reconstruction of the thermal history of individual meteorites which can be assigned to the same parent body allows to derive general characteristics of the parent body, which hold important clues on the planetary formation process. This requires to construct models for the heating of such bodies by short lived radioactives, in particular by 26Al, and its cooling by heat conduction, which then are compared with the cooling histories of the meteorites. The heat conductivity of the planetesimal material depends critically on the porosity of the chondritic material and changes by sintering of the material at elevated temperatures and pressures. Compaction of a granular material is a key process for the thermal history of the parent bodies of meteorites. The modelling of the compaction process is improved by applying concepts originally developed for hot isostatic pressing in metallurgical processes. It is extended to a binary mixture of matrix and chondrules, as observed in chondrites. By comparison with published data on sintering experiments it is shown that the algorithm allows a sufficiently accurate modelling of the compaction of silicate material. It is shown that the characteristic temperature at which sintering occurs is different for matrix or chondrule dominated precursor material. We apply the new method to model the thermal evolution of the parent body of the H chondrites and determine an improved optimized set of model parameters for this body.
评鱼峡谷 sanid 40K 衰变常数和 40Ar */ 40K 联合测定
影响因子：
5
作者：
Schwarz W.H;Kossert K;Trieloff M;Hopp J.
通讯作者：
Hopp J.