Geologia dos granitos peraluminosos do município de Itapema, SC

TCC(graduação) - Universidade Federal de Santa Catarina. Centro de Filosofia e Ciências Humanas. Departamento de Geologia. Geologia.Os granitos perlauminosos (também chamados de leucogranitos) que ocorrem na região costeira de Itapema são constituídos por injeções tabulares de espessura variando entre 10 e 50cm e orientação SW-NE, são concordantes a sub-concordantes com relação a foliação regional S2 dos gnaises cálcio- silicáticos encanixantes, pertencentes ao Complexo Metamórfico Brusque. Este complexo é caracterizado como um espesso pacote de rochas metassedimentares clásticas, dominado por filitos e xistos micáceos intercalados com semipelitos, quartzitos, mármores e rochas calci-silicáticas, possui ocorrências restritas de rochas metavulcânicas de composição máfica a ultramáfica, além das referidas rochas graníticas intrusivas. Esses granitóides que foram injetados a 545 ± 55Ma (datação de Monazita por Tickyj et al., 2004), são subhorinzontais e horizontais em relação às rochas encaixantes e estão localizados nas praias de Ponta Grossa, Ponta da Ilhota e Meia Praia, onde foram coletadas amostras para análise em duas escalas, macro e microscópica. As descrições foram feitas com base em estimativa de proporção mineral e na análise de texturas, também foram identificados minerais de alteração hidrotermal (com seritização e/ou cloritização) e de alteração intempérica (com oxidação e/ou argilização). As texturas foram classificadas de acordo com a relação entre os grãos, homogeneidade granulométrica e granulometria. A nomenclatura seguiu as orientações da IUGS e BSG, de modo que as injeções foram classificadas como: Sienogranito equigranular fino a médio com turmalina-muscovita; Muscovita monzogranito inequigranular fino a grosso com turmalina; Sienogranito-pegmatítico médio a muito grosso com biotita-turmalina-apatita-epidoto; Alcalifeldspato-granito inequigranular fino a grosso com turmalina-muscovita; Sienogranito equigranular fino a médio com biotita; Biotita sienogranito equigranular fino a médio; Muscovita- apatita monzonito inequigranular fino a grosso com epidoto; Granodiorito inequigranular fino a grosso com turmalina-muscovita; Monzogranito-pegmatítico médio a muito grosso com muscovita- epidoto-biotita-apatita; Muscovita granodiorito equigranular fino a médio com granada.Perlauminous granites (also called leucogranites) that occur in the coastal region of Itapema consist of tabular injections of thickness ranging from 10 to 50cm and SW-NE orientation, are concordant to sub-concordant with the regional foliation S2 of calcium-gneisses silicate compounds belonging to the Brusque Metamorphic Complex. This complex is characterized as a thick package of clastic metasedimentary rocks, dominated by phyllites and micaceous shales interspersed with semipelites, quartzites, marbles and calci-silicate rocks. These granitoids were injected at 545 ± 55Ma (dating from Monazita by Tickyj et al., 2004), they are subhorinzontal and horizontal to the embedded rocks and they occur in the north coast of Itapema, at the beaches: Ponta Grossa, Ponta da Ilhota and Meia Praia, where samples were collected for analysis in thin and hand samples. Descriptions of thin sections were made based on mineral proportion estimation and texture analysis, weathering (with oxidation and/or clayization) and hydrothermal (with seritization and/or chloritization) minerals were also identified. The textures were classified according to the relationship between grains, particle size homogeneity and grain size. The nomenclature followed the IUGS and BSG guidelines, thus, the samples were classified as: thin to medium equigranular syenogranite with tourmaline-muscovite; Thin to coarse unequigranular muscovite monzogranite with tourmaline; Medium to very thick syngogranite- pegmatite with biotite-tourmaline-apatite-epidote; Fine to coarse unequigranular alkalifeldspar- granite with tourmaline muscovite; Fine to medium equigranular syenogranite with biotite; Fine to medium equigranular biotite syenogranite; Thin to thick unequigranular muscovite-apatite monzonite with epidote; Fine to coarse unequigranular granodiorite with tourmaline-muscovite; Medium to very thick monzogranite-pegmatite with muscovite-epidote-biotite-apatite); Fine to medium equigranular muscovite granodiorite with grenade

Mummy berry pseudosclerotia survive for several years

Organic blueberry production in the PNW has many challenges, including diseases like mummy berry caused by the fungus Monilinia vaccinii-corymbosi (Reade) Honey. Management recommendations focus on reducing overwintering pseudosclerotia, however, it is unknown how long they survive. Based on qualitative observations pseudosclerotia are hypothesized to survive multiple years after contact with the soil surface. The development of apothecia from M. vaccinii-corymbosi pseudosclerotia was evaluated over multiple years at a location without a history of blueberry production. A total of 1,000 pseudosclerotia were placed on field soil plots in 2018 and replicated eight times. Another 100 pseudosclerotia were placed in wire corrals on field soil and replicated fifteen times. Plots and corrals were regularly examined each spring for the emergence of apothecia. The pseudosclerotia were able to survive, germinate, and produce apothecia for up to five years after their placement. Very few pseudosclerotia produced apothecia in any year, varying from 0 to 18 at any observed time. Pieces of partial or whole pseudosclerotia were observed for up to three years after placement. Our study shows that a pseudosclerotial “seed bank” exists under blueberry bushes, necessitating a long-term implementation of mummy berry cultural management tactics