当前位置: X-MOL 学术Solid Earth › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Joint modeling gravity, geoidal and geothermal of the Lithosphere in Sergipano Belt and tectonic implications, NE Brazil
Solid Earth ( IF 3.4 ) Pub Date : 2021-07-30 , DOI: 10.5194/se-2021-81
Onofre H. D. J. das Flores , Alanna C. Dutra , Alexandre B. Costa , Roberto M. Argollo

Abstract. In this research paper were applied methods which integrate geophysical and petrological data to the crustal and lithospheric structure in the Sergipano Belt, in the Southern Borborema Province, NE Brazil. These methods allowed us to unveil the main crustal features and their tectonic relationships with the crust-mantle interface (Moho), as well as the lithosphere-asthenosphere boundary (LAB) of this region. The crust structure was constrained by available geological, gravimetric and seismological data, and chemical composition for mantle bodies. Gravity, geoid and heat flow data integrated with existent geological and geophysical data provides to understand the evolution of the Southern Borborema Province. The modeling method was based on local isostasy in which the first phase of the work consisted on the filtering of geoid anomaly and topography data using low-pass in the harmonic and frequency domains, respectively, to estimate the thickness of the crust and the lithosphere, and the second phase is characterized by geothermal modeling. The crustal structure was constrained by geological information, thermo-physical parameters, and gravity and magnetic data inversion results, while the lithospheric mantle was constrained by chemical composition of xenoliths. The results show that maximum depths of Moho and thermal lithosphere (LAB) along the modeled profile are 34–42 km and 194–202 km observed, and temperatures are recorded with an average of 600 °C in the Moho temperature at Sergipano belt. The results presented suggest a thinning lithospheric mantle below the Sergipano belt, with values varying between 168 to 180 km, excepting in Girau do Ponciano whose is 194 km and a moderate lithospheric thickening below the Rio Coruripe, and thicker lithosphere at Pernambuco-Alagoas terrains reached 202 km.

中文翻译:

巴西东北部塞尔吉帕诺带岩石圈的重力、大地水准面和地热联合建模及其构造影响

摘要。在这篇研究论文中,应用了将地球物理和岩石学数据整合到巴西东北部南部 Borborema 省塞尔吉帕诺带的地壳和岩石圈结构中的方法。这些方法使我们能够揭示该地区的主要地壳特征及其与壳幔界面(莫霍面)以及岩石圈-软流圈边界(LAB)的构造关系。地壳结构受到现有地质、重力和地震数据以及地幔体化学成分的限制。重力、大地水准面和热流数据与现有地质和地球物理数据相结合,有助于了解南博雷马省的演变。建模方法基于局部均衡,其中工作的第一阶段包括分别在谐波和频域中使用低通滤波大地水准面异常和地形数据,以估计地壳和岩石圈的厚度,第二阶段以地热建模为特征。地壳结构受地质信息、热物理参数和重磁数据反演结果的约束,而岩石圈地幔受捕虏体化学成分的约束。结果表明,沿模拟剖面的莫霍面和热岩石圈 (LAB) 的最大深度为 34-42 公里和 194-202 公里,并且在塞尔吉帕诺带的莫霍面温度中记录的温度平均为 600 °C。
更新日期:2021-07-30
down
wechat
bug