Cooling rates of hyaloclastites : applications of relaxation geospeedometry to undersea volcanic deposits.
Cooling rates of hyaloclastites : applications of relaxation geospeedometry to undersea volcanic deposits.
复制标题
透明碎屑岩的冷却速率：弛豫地球速度计在海底火山沉积物中的应用。
DOI：
10.1007/s004450050009
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发表时间：
2000
影响因子：
3.5
通讯作者：
L. Wilson
中科院分区：
文献类型：
--
作者：
M. Wilding;Donald Bruce Dingwell;R. Batiza;L. Wilson
来自三种不同玻璃碎屑岩的玻璃碎片已被用于评估海底火山沉积物所经历的冷却速率范围。我们发现，玻璃碎片保留的结构，从25至0.15 K min-1的表观淬火速率的范围。最快的冷却速率被解释为那些由冷却的熔岩附近的水界面。简单的传导冷却模型产生的淬火速率范围相比，更迅速冷却的样品。由于结晶的开始，非常慢的表观淬火速率不太可能由通过玻璃化转变的简单线性冷却产生;相反，它们是更复杂的热历史的指标，所述热历史涉及在玻璃化转变间隔内的温度下对玻璃进行退火，停留时间足以允许玻璃松弛至较低温度结构。记录在这些样品中的热历史说明了喷发过程的复杂性，并表明天然玻璃的淬火速率保留了与更复杂的冷却模型相关的信息。
Glass fragments from three different hyaloclastites have been used to evaluate the range of cooling rates experienced by undersea volcanic deposits. We found that the glass fragments retain structures with a range of apparent quench rates from 25 to 0.15 K min–1. The most rapid cooling rates are interpreted to be those resulting from cooling of the lava near the water interface. Simple conductive cooling models produce a range of quench rates comparable to those of the more rapidly cooled samples. The very slow apparent quench rates are unlikely to result from simple linear cooling through the glass transition, because of the onset of crystallization; instead, they are indicators of a more complex thermal history that involves the annealing of glasses at temperatures within the glass transition interval for a dwell time sufficient to allow the relaxation of the glass to lower temperature structures. The thermal history recorded in these samples illustrates the complexity of eruptive processes and demonstrates that quench rates for natural glasses retain information relevant to more complex cooling models.