Magmatic underplating can be defined as the addition of mafic magma to the lower crust and uppermost mantle around the Moho. This phenomenon plays an important role in continental margins and other compressional and extensional tectonic environments. We have modeled the magmatic underplating effect using Process-Oriented Gravity Modeling (POGM) along a profile at 43.5°S on the Argentine continental margin, which re-thickens the crust and causes uplift. In POGM, the gravity anomaly is formed by the rift, sedimentation, and magmatic underplating anomaly. This work focuses on the flexural uplift produced by the magmatic underplating and its gravity anomaly, rarely investigated in margins since seismic refraction data is generally unavailable to the scientific community. Particularly, it has not been calculated in the volcanic sector of the Argentine continental margin before this work. The results yield an average maximum flexural uplift associated with magmatic underplating, which is um = 140.32 m ± 22.12 m, an average density of the underplated body of ρ_x = 3133.89 kg/m³ ± 22.71 kg/m³, and an average density of the sediment ρ_s = 2207.78 kg/m³ ± 42.58 kg/m³ and an average oceanic crustal thickness of 6.36 km. The average elastic thickness leaving out the magmatic underplating effect is Te = 24 km ± 2.02 km, and including it is Te = 33.89 km ± 2.35 km. The magmatic underplating anomaly has an opposite contribution to the typical free-air gravity edge-effect for the Airy and flexural cases.

岩浆岩床可以定义为在莫霍面附近的下部地壳和最上层地幔中增加了镁铁质岩浆。这种现象在大陆边缘以及其他压缩和伸展构造环境中起着重要作用。我们已经使用过程导向重力模型（POGM）沿阿根廷大陆边缘43.5°S的剖面对岩浆的地下作用进行了建模，这使地壳重新增厚并引起隆升。在POGM中，重力异常是由裂谷，沉积和岩浆基底异常形成的。这项工作的重点是岩浆底板的弯曲抬升及其重力异常，由于科学界通常无法获得地震折射数据，因此很少在边缘进行调查。特别，在进行这项工作之前，还没有在阿根廷大陆边缘的火山区中计算出它。结果产生了与岩浆底板有关的平均最大挠曲隆起，um = 140.32 m±22.12 m，底板下主体的平均密度为ρ_X  =3133.89公斤/米³  ±22.71公斤/米³，并且平均密度沉积物ρ_小号 =2207.78公斤/米³  ±42.58公斤/米³和6.36公里平均洋壳厚度。排除岩浆作用的平均弹性厚度为Te = 24 km±2.02 km，其中包括Te = 33.89 km±2.35 km。对于艾里和弯曲情况，岩浆下垫异常对典型的自由重力重力边缘效应有相反的影响。