Campinas, recognized for its metropolitan importance, has just gained a fundamental resource for the study of its geology: the Petrographic Atlas of the Municipality of Campinas. Prepared as a Final Course Project (TCC) by Helena Pivoto Paiva, under the guidance of Professor Wagner da Silva Amaral, in the undergraduate Geology course at the Institute of Geosciences (IG) of Unicamp, the 110-page Atlas aims to gather, in an illustrated and didactic format, geological knowledge, especially about the rocks of the municipality.
Since 1993, Campinas has had a geological map, produced by the Geological Institute of São Paulo, which included a report describing the mapped rocks. This material served as an initial guide for the creation of the Petrographic Atlas, which provides a detailed description of the main rocks found in the municipality based on samples collected in the field, with a wealth of detail. "A description of the samples was made at the mesoscale, which would be hand scale, and a detailed microscopic examination with thin sections," explains Amaral. With this, it was possible to classify and describe the rocks within three major groups: igneous, metamorphic, and sedimentary. In short, igneous rocks are formed by the cooling of magma; sedimentary rocks, by the accumulation of sediments; and metamorphic rocks, by the transformation of other rocks under conditions of pressure and heat.
Paiva had already studied various metallic minerals in thin sections during his first scientific initiation project, which resulted in a Mineral Identification GuideIt was his experience in microscopic studies and rock descriptions that led his advisor to suggest the possibility of working on the creation of an atlas of the city. "We saw an opportunity to base our study on the municipality's area, since we had easy access to collect samples," the professor points out.
Furthermore, the IG has a collection of different types of rocks found in the municipality, which facilitated the study. Campinas is home to both rare rocks and metamorphic rocks, which could form the basis of a geological formation. oceano...as well as more common rocks, such as granites from the Pico das Cabras region, used in civil construction. "Even though it's a densely populated municipality, with many buildings and properties, there are still many rock outcrops that we can access. This allows Campinas to be a great laboratory for research and education," adds Amaral.
The content was designed to be accessible not only to an academic audience, but also to high school students and curious individuals in general. To facilitate understanding, the author included an introduction with basic geology concepts and a glossary explaining technical terms. The material is available for free (as...). PDF/e-book) by the César Lattes Library at Unicamp.
According to Amaral, the Atlas popularizes some of the research conducted at the University and can support the development of master plans or discussions on territorial planning. "It's knowledge that will serve various applications," she emphasizes. Using a more didactic and less scientific language, the reader finds, right in the introduction, an explanation of some basic geological concepts, such as the main types of rocks, their structures, and how they are formed. More scientific concepts, which may be more difficult to understand, are presented in a glossary. "For the lay public who are curious to know where they are standing, this is a very informative material," Amaral points out. "High school students, for example, who are interested in geology and geography can understand a little more about the physical environment of our region," concludes the newly graduated geologist.
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