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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Thermal segmentation along the N. Ecuador-S. Colombia margin (1-4 degrees N): Prominent influence of sedimentation rate in the trench
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Thermal segmentation along the N. Ecuador-S. Colombia margin (1-4 degrees N): Prominent influence of sedimentation rate in the trench

机译：沿厄瓜多尔北部地区的热分段。哥伦比亚边缘（北纬1-4度）：沟槽中沉积速率的显着影响

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摘要

Along the deformation front of the North Ecuador-South Colombia (NESC) margin, both surface heat flow and trench sediment thickness show prominent along-strike variations, indicating significant spatial variations in sedimentation rate. Investigating these variations helps us address the important question of how trench sedimentation influences the temperature distribution along the interplate contact and the extent of the megathrust seismogenic zone. We examine this issue by analysing 1/ a new dense reflection data set, 21 pre-stack depth migration of selected multichannel seismic reflection lines, 3/ numerous newly-identified bottom-simulating reflectors and 4/ the first heat probe measurements in the region. We develop thermal models that include sediment deposition and compaction on the cooling oceanic plate as well as Viscous corner flow in the mantle wedge. We estimate that the temperature from 60-150 degrees C to 350-450 degrees C, commonly associated with the updip and downdip limits of the seismogenic zone, extends along the plate interface over a downclip distance of 160 to 190 20 km. We conclude that the updip limit of the seismogenic zone for the great megathrust earthquake of 1979 is associated with low-temperature (60-70 degrees C) processes. Our models also suggest that 60-70% of the two-fold decrease in measured heat flow from 3 degrees N to 2.8 degrees N is related to an abrupt Southward increase in sedimentation rate in the trench. Such a change may potentially induce a landward shift of the 60-150 degrees C isotherms, and thus the updip limit of the seismogenic zone, by 10 to 20 km.
机译：沿着北厄瓜多尔-南哥伦比亚（NESC）边缘的形变前沿，地表热流和沟槽沉积物厚度均显示出明显的沿走向变化，表明沉积速率存在明显的空间变化。研究这些变化有助于我们解决一个重要的问题，即沟槽沉积如何影响沿板间接触的温度分布以及大推力成震带的范围。我们通过分析1 /一个新的密集反射数据集，21个选定的多通道地震反射线的叠前深度偏移，3 /许多新近识别的底部模拟反射器和4 /该区域的第一个热探针测量值来研究此问题。我们开发了热模型，包括冷却海洋板上的沉积物沉积和压实，以及地幔楔中的粘性角流。我们估计温度通常在60-150摄氏度到350-450摄氏度之间，通常与震源区的上下倾斜极限相关，沿着板块界面延伸超过160至190 20 km的下倾距离。我们得出的结论是，1979年大推力地震的发震带上升极限与低温（60-70摄氏度）过程有关。我们的模型还表明，从3度N到2.8度N的实测热流减少两倍的60-70％与沟槽中沉降速率的南突然增加有关。这样的变化可能会引起60-150摄氏度等温线的陆上偏移，从而使震源带的上倾极限增加10至20 km。

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