The thermal alteration by pyrolysis of the organic component of small projectiles of mudrock during capture at hypervelocity
The thermal alteration by pyrolysis of the organic component of small projectiles of mudrock during capture at hypervelocity
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DOI：
10.1016/j.jaap.2008.05.002
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发表时间：
2008-07-01
影响因子：
6
通讯作者：
Burchell, Mark J.
中科院分区：
文献类型：
--
作者：
Bowden, Stephen A.;Court, Richard W.;Burchell, Mark J.
通过一系列实验，观察了高TOC泥岩小弹丸超高速撞击（HVI）过程中产生的热裂解效应。如此高速（km / s(-1)）的撞击释放出足够的能量使金属抛射物蒸发，产生的温度大大超过了沉积有机质热蚀变实验室研究中通常使用的热解温度。尽管如此，对高速撞击砂层和水层的奥卡迪亚层叠岩抛射体进行的有机地球化学分析表明，生物标志物的结构骨架保持完整，只发生了相对较低程度的热蚀变（油前窗口）。虽然进一步的研究是必要的，但似乎在超高速下捕获的弹丸的有机成分将是其前体的稍微热改变的样品。(C) 2008 Elsevier B.V.版权所有
In a series of experiments the pyrolytic effects of the heating induced during the hypervelocity impact (HVI) of small projectiles of high TOC mudrock were observed. Impacts at these high speeds (km s(-1)) release sufficient energy to vaporise metal projectiles, and the temperatures created greatly exceed the pyrolysis temperatures typically employed during laboratory studies of the thermal alteration of sedimentary organic matter. Despite this the organic geochemical analyses of projectiles of Orcadian Laminite impacted into targets of sand and water at hypervelocities provides evidence that the structural backbone of biomarkers has remained intact and that only a comparatively low degree of thermal alteration (pre-oil window) has occurred. While further studies are necessary, it appears that the organic component of a projectile captured at hypervelocity will be a slightly thermally altered sample of its precursor. (C) 2008 Elsevier B.V. All rights reserved.