Seismic constraints on temperature of the Australian uppermost mantle
Seismic constraints on temperature of the Australian uppermost mantle
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DOI：
10.1016/j.epsl.2005.05.001
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发表时间：
2005-07
影响因子：
5.3
通讯作者：
S. Goes;F. Simons;K. Yoshizawa
中科院分区：
文献类型：
--
作者：
S. Goes;F. Simons;K. Yoshizawa
我们从两个已发表的S速度模型得到了澳大利亚大陆地幔80-350公里深度温度的估计值。岩石圈温度在1000℃以上，温度与构造年龄之间存在着大范围的相关性。然而，详细地说，每个构造省的变化范围在200至700°C之间。在目前的地震分辨率下，严格来说，元古界和太古宙地块的温度没有本质上的不同，塔斯曼线以东和以西的显生宙岩石圈也没有明显的差异。接近平均(潮湿)MORB源地幔固相线的温度是东海岸及其近海的特征。由两种速度模型得出的温度差异说明了严格约束的绝对速度和梯度对于物理解释的重要性。岩石圈温度的大范围不能仅仅用记录在案的地壳产热的可变性来解释，还需要地幔热流的显著变化。
We derive estimates of temperature of the Australian continental mantle between 80 and 350 km depth from two published S-velocity models. Lithospheric temperatures range over about 1000 °C, with a large-scale correlation between temperature and tectonic age. In detail however, variations ranging from 200 to 700 °C occur within each tectonic province. At the current seismic resolution, strictly Proterozoic and Archean blocks do not have substantially different temperatures, nor does the Phanerozoic lithosphere east and west of the Tasman line. Temperatures close to an average (moist) MORB source mantle solidus characterize the eastern seaboard and its offshore. Differences between the temperatures derived from the two velocity models illustrate the importance of well-constrained absolute velocities and gradients for physical interpretation. The large range of lithospheric temperatures cannot be explained solely with documented variability in crustal heat production, but requires significant variations in mantle heat flow as well.