Modelagem lito-estrutural de superfície do depósito sossego com os softwares GEMCOM e I-SITE STUDIOMÓDULO GEOTÉCNICO

Abstract

This study aims the compilation, understanding and correlation of structural events of deposit IOCG Sequeirinho – Sossego, from the analysis and interpretation of structural data mapped in the field, products of sensor Laser Scanner, and geologic structural model. IOCG Cu-Au type Olimpic Dam (Australia) and Sossego (Serra dos Carajás, Brazil are large scale deposits (>100 Mt of Ore), usually with disseminated ore, with copper grades between 0,5 to 2% Cu/t and 0,1 to 0,8 g Au/T, with strong structural control. The modeling Geo – Strutural of the deposit Sequeirinho – Sossego allows to observe the relation between the main structures trends in the deposit área, the indirect method with Laser Scanner was used too. The Sossego deposit consists of two major groups of orebodies formed in different ages, a alonged orebody neoarchean, where is mining Cu – Au in the Sequeirinho and Pista Pits. And a vertical pipelike breccia body, in the Sossego Pit. The regional structural trend WNW-ESE from embasament is identified in both orebodies and relation magnetite/ore too. The Sequeirinho – Baiano – Pista deposits (2.71 – 2.68 Ga; Re-Os molybdenita; U-Pb monazita. MORETO, 2015) has the distinct alteration assemblages sodic – calcic (albite + actinolite). The mineralization is controlled by two main structures: a NE-SW sinistral fault and a WNW-ESE shear zone. The Sossego orebody (1.90 – 1.88 Ga; U-Pb monazita; MORETO, 2015) is a shallow IOCG deposit (MONTEIRO, 2008). The mineralization occurs in the form of breccias, the structures has a multidirectional setting, interconnected, with predominance of WNW-ESE subvertical faults