近日，澳大利亚科廷大学Chris Clark团队最新的研究揭示了超高温造山带的超低速冷却。2024年9月9日，国际知名学术期刊《地质学》发表了这一成果。

为了限制来自超高温造山带的下地壳岩石的冷却速度，研究人员测定了6个大间距变质沉积石榴子石-矽线石片麻岩样品中，变质锆石的年龄和平衡温度，样品采自印度东部东高止山脉省。

研究人员解释道，变质锆石的组合数据在约950-800Ma的2σ不确定度范围内持续下降，锆石结晶的时间与约150m.y.一致。在此期间，每个测年点的锆石钛温度随年龄的增长而下降，对应的线性冷却速率为0.26-0.90°C/m.y.。研究结果强调，东高止山脉省下地壳产热元素的保留和低净侵蚀率，是造成约150 m.y.超低速冷却的原因。

附：英文原文

Title: Ultraslow cooling of an ultrahot orogen

Author: Chris Clark, Michael Brown, Ben Knight, Tim E. Johnson, Ruairidh J. Mitchell, Saibal Gupta

Issue&Volume: 2024-09-09

Abstract: To constrain the rate of cooling of lower-crustal rocks from an ultrahot orogen, we determined both the age and equilibration temperature of metamorphic zircon from six widely spaced samples of metasedimentary garnetsillimanite gneiss from the Eastern Ghats Province in eastern India. For the combined data set of metamorphic zircon, concordant dates decrease continuously within 2σ uncertainty from around 950 Ma to 800 Ma, consistent with ～150 m.y. of zircon crystallization. Ti-in-zircon temperatures for each dated spot during this period decrease with age, corresponding to linear cooling rates ranging from 0.26 to 0.90 °C/m.y. We propose that retention of heat-producing elements in the lower crust of the Eastern Ghats Province and a low net erosion rate were responsible for ～150 m.y. of ultraslow cooling.

DOI: 10.1130/G52442.1

Source: https://pubs.geoscienceworld.org/gsa/geology/article/doi/10.1130/G52442.1/648330/Ultraslow-cooling-of-an-ultrahot-orogen