气候变化领域集成服务门户(CCPortal): Structural signatures of the Amazonian Craton in eastern Colombia from gravity and magnetometry data interpretation

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DOI	10.1016/j.tecto.2020.228705
	Structural signatures of the Amazonian Craton in eastern Colombia from gravity and magnetometry data interpretation
	Moyano Nieto I.E.; Prieto G.A.
发表日期	2021
ISSN	00401951
卷号	800
英文摘要	Geophysical interpretation of potential field data plays an important role in the integration of geological data. Estimation of density and magnetic susceptibility variations within the upper crust helps evaluating the continuity of geological structures in the field. In the present study we use gravity and magnetic data in NW Amazonian Craton in Colombia. Total horizontal gradient of the reduction to magnetic pole were used to delineate magnetic lineaments and domains showing four zones, each with its own features. Multiscale edge detection (worming) of the data help delineate upper crustal structures that we interpret as tectonic boundaries that correlate with the four zones identified. 3D density and magnetic susceptibility inversion showed high density and/or high magnetic susceptibility sources correlated with these crustal structures. Zone (1) is located south of the Guaviare River, with predominant NW-SE and NE-SW magnetic lineaments; zone (2), located from south of the Guaviare River to the north, present nearly E-W magnetic lineaments and a deep E-W edge interpreted as a possible shear zone parallel to Guaviare, Orinoco and Ventuari rivers; zone (3) from south of the Vichada River to the north, with NE-SW and NW-SE lineaments; N-S zone (4) cuts the zones (2) and (3), characterized by high density/magnetic susceptibility source bounded by N-S deep edges. A more complete tectonic evolution interpretation requires further work, but we speculate that the zone (4) could indicate an aborted rift/collision suture and that the zone (2) is indicative of a younger deformation event. Shear direction at (2) is not clear: geological maps show NEE-SWW right-lateral faulting, but geophysical anomalies suggest left-lateral displacement, highlighted by left dislocation of the Orinoco River. We also speculate that a N-S edge located at the SE of the area can be related with the Atabapo Belt and the limit of Ventuari-Tapajós and Rionegro geochronological provinces. © 2020 Elsevier B.V.
关键词	Magnetic/gravity data interpretation Multiscale edge detection NW Amazonian Craton Structural interpretation
英文关键词	Edge detection; Geochronology; Geophysics; Magnetic susceptibility; Magnetometry; Rivers; Structural geology; Tectonics; Data interpretation; Geological structures; Horizontal gradients; Lateral displacements; Multiscale edge detection; Potential field datum; Structural signatures; Tectonic boundaries; Magnetism; data interpretation; data set; deformation; displacement; gravity anomaly; magnetic anomaly; magnetic susceptibility; rifting; tectonic evolution; tectonic setting; Brazil; Brazilian Shield
语种	英语
来源期刊	Tectonophysics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/208035
作者单位	Departamento de Geociencias, Universidad Nacional de Colombia, Bogotá, Colombia; Servicio Geológico Colombiano, Dirección de Recursos Minerales, Diagonal 53, Bogotá, 34-53, Colombia
推荐引用方式 GB/T 7714	Moyano Nieto I.E.,Prieto G.A.. Structural signatures of the Amazonian Craton in eastern Colombia from gravity and magnetometry data interpretation[J],2021,800.
APA	Moyano Nieto I.E.,&Prieto G.A..(2021).Structural signatures of the Amazonian Craton in eastern Colombia from gravity and magnetometry data interpretation.Tectonophysics,800.
MLA	Moyano Nieto I.E.,et al."Structural signatures of the Amazonian Craton in eastern Colombia from gravity and magnetometry data interpretation".Tectonophysics 800(2021).