📋 Tender Overview
As part of the work to update the National Geological Chart at 150 000 scale the Geological Mining and Metallurgical Institute Ingemmet carried out the geological mapping of the Huancapi quadrangle located in the central southern part of the Western Cordillera which covers part of the provinces of Cangallo Huancapi and Huanca Sancos in the department of Ayacucho. The investigation is presented in the bulletin N 31 L Geology of the Huancapi Quadrangle sheets 281 282 283 284 which contains new geological surface information obtained during field work in 2015. During the investigation 1567 geological observation points POG were obtained that contain stratigraphic sedimentological cartographic structural information rock and fossil sampling etc. Regarding the fossils more than 25 samples of fossils and rocks were collected for dating that allowed adjusting the ages of the stratigraphic units involved. The new data and observations have allowed the Chocolate Socosani Puente and Castrovirreyna formations to be recorded for the first time in this part of the Western Cordillera which allowed the stratigraphy of the area to be redefined. Likewise the Triassic-Jurassic carbonate rocks of the Pucar Formation undivided have been differentiated from the Cretaceous carbonate rocks of the Arcurquina Formation. Detailed surface mapping has made it possible to add new polygons with the units defined for the first time. Likewise it allows defining new faults and folds that help to better explain the deformation of the stratigraphic units involved and the tectonic complexity of the study area. The aforementioned results in the proposal of four new geological maps at a scale of 1 50000 with new verifiable stratigraphic and structural information where the new stratigraphy contact relationships and new geological structures have been reflected in greater detail flaws and folds. The geological bulletin complies with the requirements for the generation of field geological information POGs as well as with the information processed both in the office and in the Ingemmet laboratories such as the petrographic analysis of thin sections and the paleontological determination of fossils. The results support the updating of the geological mapping and provide new contributions that can be useful both in the exploration of mineral resources in general and in the study of sedimentary basins. On the other hand the investigation in the Huancapi quadrangle sheet 28 has as additional results the publication of bio-stratigraphic studies of the Chocolate Formation sedimentary origin studies of the Yura Group and sedimentological studies of the Castrovirreyna Formation that were presented in the XVIII Peruvian Congress of Geology.
