Long‐term thermal consequences of the redistribution of heat‐producing elements associated with large‐scale granitic complexes
Long‐term thermal consequences of the redistribution of heat‐producing elements associated with large‐scale granitic complexes
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DOI：
10.1046/j.0263-4929.2001.00359.x
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发表时间：
2002-01
影响因子：
3.4
通讯作者：
M. Sandiford;S. McLaren;N. Neumann
中科院分区：
文献类型：
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作者：
M. Sandiford;S. McLaren;N. Neumann
地壳热状态对产热元素的数量和分布都很敏感。由于hpe的地壳补体中有很大一部分包含在花岗岩中，花岗岩的生成和侵位应该导致地壳热结构的显著长期变化。利用适合于澳大利亚元古代花岗岩的HPE浓度，我们发现，相对于前花岗岩传导热状态，花岗岩偏析导致地壳温度场的变化高达50℃，在源区产生长期冷却，在侵位水平产生加热。由于热状态和岩石圈强度之间的密切联系，花岗岩辅助的hpe再分配可能是克拉通化的基础。
Crustal thermal regimes are sensitive to both the amount and distribution of heat producing elements (HPEs). Since a significant proportion of the crustal complement of HPEs is contained within granites, granite generation and emplacement should lead to significant long‐term changes in the thermal structure of the crust. Using HPE concentrations appropriate to representative Australian Proterozoic granites we show that granite segregation leads to changes in the temperature field of the crust of up to c. 50 °C, producing long‐term cooling in the source regions and heating at emplacement levels, relative to the pre‐granite conductive thermal regime. Because of the intimate connection between thermal regime and lithospheric strength, granite‐assisted redistribution of HPEs is likely to be fundamental to cratonisation.