Heat flow measurements in the Arabian Plate are inconsistent with anticipated heat flow levels and are not uniformly distributed. They originate mostly from shallow temperature measurements for geothermal surveys and are not specifically targeted for determining the thermal field at the lithosphere scale. We employed spectral analysis of aeromagnetic data based on the fractal distribution of sources to estimate the depth to Curie isotherm (580 °C) in 22 overlapping windows along a southwest-northeast oriented transect of 1000 km across the Arabian Plate. We used the estimate of depth to Curie isotherm and present depth to the lithosphere-asthenosphere boundary to constrain a set of geotherms and to predict surface heat flow and bulk radiogenic heat production across the Arabian Plate. The results indicate that the depth to Curie isotherm is relatively deep (37 km) at the center of the plate and becomes shallower westwards (22 km) and eastwards (27 km), in the Arabian Shield and the Arabian Platform, respectively. The estimated bulk radiogenic heat production in the Arabian Shield is relatively low (0.4 μW/m) and increases gradually to 1.12 μW/m towards the eastern part of the plate. The estimated surface heat flow is low at the center of the plate (45.6 m/Wm) and rises to about 65 m/Wm in the west of the Shield and also in the east of the plate. The average surface heat flow on the entire Arabian Shield is around 50 mW/m, in accordance with the average heat flow observed on Late Precambrian crust worldwide, but contrasts with the heat flow measurements in the Saudi Arabian part (36 and 45 mW/m). The elevation of the upper mantle as well as the relatively high radiogenic heat production in the crust can be considered as the causes of the higher level of heat flow at the eastern side of the platform. The results of our study provide a better understanding of the thermal structure of the Arabian Plate and show how potential field data can be employed as a constraint when calibrating basin models.

中文翻译：

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阿拉伯板块居里深度分布的重建：对其区域热结构的影响

阿拉伯板块的热流测量与预期的热流水平不一致，并且分布不均匀。它们主要源自地热勘测的浅层温度测量，并不是专门用于确定岩石圈尺度的热场。我们采用基于源分形分布的航磁数据频谱分析来估计沿阿拉伯板块西南-东北向横断面 1000 公里的 22 个重叠窗口中居里等温线 (580 °C) 的深度。我们使用居里等温线深度的估计和岩石圈-软流圈边界的当前深度来约束一组地温并预测整个阿拉伯板块的表面热流和大量放射热产生。结果表明，在阿拉伯地盾和阿拉伯地台，居里等温线的深度在板块中心相对较深（37 km），向西（22 km）和向东（27 km）分别变浅。估计阿拉伯地盾的大量放射热产生量相对较低（0.4 μW/m），并向板块东部逐渐增加至 1.12 μW/m。估计的地表热流在板块中心较低 (45.6 m/Wm)，在盾构西部和板块东部升至约 65 m/Wm。整个阿拉伯地盾的平均表面热流约为 50 mW/m，与全球晚前寒武纪地壳观测到的平均热流一致，但与沙特阿拉伯部分的热流测量值（36 和 45 mW/m）形成鲜明对比。 ）。上地幔的抬升以及地壳中相对较高的放射成因热产生可以被认为是台地东侧热流水平较高的原因。我们的研究结果使人们更好地了解阿拉伯板块的热结构，并展示了在校准盆地模型时如何使用势场数据作为约束。