Understanding the spatio-temporal evolution of fractures in pillow basalt

IF 1.3 4区 地球科学 Q2 GEOLOGY
Tridib Mondal, Sourav Mondal, Sirshendu Biswas, Gourav Das
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引用次数: 0

Abstract

We investigated the origin and spatio-temporal evolution of cooling fractures in pillow basalt which undergo thermal contraction after their eruption in an aqueous environment. Through a computer-based simulation using Fourier transformation, the thermo elastic stress displacement profiles within individual pillow units are determined. The scaled model (pillow diameter - 1 meter) generated radial, linear fractures perpendicular to pillow margin and irregular discrete flaws in the pillow interior like the ones observed in natural examples. Radial linear fractures of 3–5 centimetre in length have been measured in pillows of average one-metre diameter from the Maradihalli region, in the Chitradurga Schist Belt, India. An estimated time of 94–118 minutes was required to get radial fractures of similar length in the simulation. Our model efficiently replicated the generation and distribution of thermal fractures and allowed an estimation of cooling time for the peripheral glassy zone but has limitations in deciphering the formation of fracture networks in progressively crystalline inner zone of pillows.
枕状玄武岩裂缝时空演化研究
研究了枕状玄武岩冷却裂缝在水环境下喷发后发生热收缩的成因及时空演化规律。通过傅里叶变换的计算机模拟,确定了单个枕单元内的热弹性应力位移曲线。比例模型(枕头直径- 1米)产生垂直于枕头边缘的径向线状裂缝和枕头内部不规则的离散缺陷,与自然例子中观察到的相似。在印度Chitradurga片岩带的Maradihalli地区,在平均直径为1米的枕头中测量到了长度为3-5厘米的径向线性裂缝。在模拟中,估计需要94-118分钟的时间来获得相似长度的桡骨裂缝。我们的模型有效地复制了热裂缝的产生和分布,并允许估计外围玻璃化区域的冷却时间,但在解释枕头逐渐结晶的内部区域裂缝网络的形成方面存在局限性。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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