Interpretation of gravimetric and magnetic anomalies in the Cameros Basin (North Spain): combination of deep and shallow sources
Interpretation of gravimetric and magnetic anomalies in the Cameros Basin (North Spain): combination of deep and shallow sources
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DOI：
10.1007/s11200-012-0369-2
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发表时间：
2013-04
影响因子：
0.9
通讯作者：
P. Río;A. Casas;J. J. Villalaín-J.;T. Mochales;R. Soto;B. Oliva‐Urcia
中科院分区：
文献类型：
--
作者：
P. Río;A. Casas;J. J. Villalaín-J.;T. Mochales;R. Soto;B. Oliva‐Urcia
喀麦隆盆地（西班牙北部）突出的位场异常（重磁异常）遵循WNW-ESE走向，与中生代伸展和第三纪盆地反转形成的地质构造平行。bouger重力正异常（15 mGal）解释为前陆盆地第三系岩石密度与古生代和中生代岩石密度的强烈对比，以及伊比利亚链相对于Ebro盆地的地壳增厚的结果。相对于布格异常的相对最大值，偶极磁异常稍微向南移动，可以解释为与基底内的火山岩有关，而基底内的火山岩与三叠纪裂陷有关，这与盆地边缘玄武岩的出露有关。对岩石性质（密度、磁化率和剩余物）和其他来源的盆地几何形状（地震反射剖面）进行详尽的分析，可以限制地壳厚度的变化和大规模基底断层的位置。
Outstanding potential field anomalies (gravimetric and magnetic) in the Cameros Basin (N Spain) follow a WNW-ESE trend, parallel to the geological structures resulting from Mesozoic extension and Tertiary basin inversion. The positive Bouguer gravity anomaly (15 mGal) is interpreted as the result of a strong contrast between the density of Tertiary rocks of the foreland basin and the Paleozoic and Mesozoic rocks, combined with crustal thickening in the Iberian Chain with respect to the Ebro Basin. The dipolar magnetic anomaly, slightly shifted to the south with respect to the relative maximum of the Bouguer anomaly, can be interpreted as related to volcanic rocks within the basement, which are linked to Triassic rifting as witnessed by outcrops of basalts along the basin margins. An exhaustive analysis of rock properties (density, magnetic susceptibility and remanence) and basin geometry from other sources (seismic reflection profiles) allow to constrain variations in crustal thickness and the location of large-scale basement faults.