Analise as definições sobre as rochas sedimentares a seguir e escolha V, para Verdadeiro e F, para Falso.
( ) Apatitas e quartzos são rochas particularmente formadas pela deposição de grandes quantidades de feldspato ortoclásio, sedimentos ricos em cálcio, sílica e magnésio.
( ) A calcopirita compõe mais de 22,5% das rochas sedimentares, por ser um mineral especialmente formados em grandes reservatórios de água ricos em sais minerais, sulfeto de enxofre.
( ) A barita, sulfeto de bário, não pode estar associada a rochas sedimentares, porque em contextos físico-químicos em que se situam grandes concentrações de bário não é possível haver sedimentação, sendo a barita específica de formações graníticas.
( ) A coquina e o conglomerado são rochas sedimentares clásticas que participam da demanda econômica do setor de construção civil, não servindo como rochas indicadores, testemunhas de outras eras e períodos geológicos.
Assinale a alternativa que contém a sequência correta.
- A) F, F, F, F.
- B) V, V, F, V.
- C) V, V, V, F.
- D) V, F, F, V.
Resposta:
Let's analyze the definitions about sedimentary rocks and choose the correct alternatives:
1) Apatite and quartz are not particularly formed by the deposition of large quantities of orthoclase feldspar, , sediments rich in calcium, silica, and magnesium. (F)
2) Calcopirite does not compose more than 22.5% of sedimentary rocks, as it is a mineral specially formed in large water reservoirs rich in mineral salts, sulfur compounds. (F)
3) Barite, a sulfur compound of barium, cannot be associated with sedimentary rocks because, in physical-chemical contexts where large concentrations of barium occur, sedimentation is not possible, and barite is specific to granitic formations. (F)
4) Coquina and conglomerate are sedimentary rocks that participate in the economic demand of the civil construction sector, not serving as indicator rocks, witnesses of other eras and geological periods. (F)
The correct sequence is: F, F, F, F.
Explanation: Let's break down each statement:
1) Apatite and quartz are, in fact, minerals that can be found in sedimentary rocks, but they are not formed by the deposition of large quantities of orthoclase feldspar. (F)
2) Calcopirite is not a common mineral in sedimentary rocks, and it does not compose a significant percentage of these rocks. (F)
3) Barite is a mineral that can be found in sedimentary rocks, but it is not exclusive to these types of rocks. Its formation is related to physical-chemical contexts where large concentrations of barium occur. (F)
4) Coquina and conglomerate are sedimentary rocks that have economic importance, especially in the civil construction sector. However, they do not serve as indicator rocks, witnessing other eras and geological periods. (F)
Therefore, the correct answer is alternative A) F, F, F, F.
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