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Palinologia (grãos de pólen de angiospermas) das formações Solimões e Içá (bacia do Solimões), nas regiões de Coari e Alto Solimões, Amazonas

2015; Volume: 18; Issue: 3 Linguagem: Inglês

10.4072/rbp.2015.3.10

ISSN

2236-1715

Autores

Rosemery Rocha da Silveira, Paulo A. Souza,

Tópico(s)

Geography and Environmental Studies

Resumo

SOLIMÕES BASIN), IN COARI AND ALTO SOLIMÕES REGIONS, AMAZONAS.A total of 93 samples collected at 12 outcrops from Solimões and Içá formations, in the region of Coari (fi ve outcrops) and Alto Solimões (seven outcrops), Amazonas State, was conducted for pollen analysis.Palynomorphs recovered comprise sporomorphs (representatives of fungi, ferns, gymnosperms and angiosperms), algae cysts and scolecodont.In general, the specimens are well preserved, rarely presenting corrosion or breaking, resulting in an exceptional photomicrographic record.This paper presents the 48 angiosperm pollen grains, appropriately illustrated and described, when needed.The composition of palynofl oras in both areas presents contrasts; those ones from Alto Solimões show less diversity, but have higher abundance in comparison with the Coari ones.In the Alto Solimões the most common taxa are Crotoidaepollenites reticulatus, Grimsdalea magnaclavata, Monoporites annulatus, Multimarginites vanderhammeni, Retitrescolpites irregularis, Perfotricolpites digitatus, Corsinipollenites undulatus, Bombacacidites nacimientoensis, B. simpliciriloensis and Perisyncolporites pokornyi.The most common taxa in Coari are Fenestrites sp.2, Mauritiidites franciscoi, Monoporites annulatus, Retitrescolpites irreguaris, Corsinipollenites undulatus and Bombacacidites nacimientoensis.Recognition of Asteraceae indicates for deposits of the Solimões Formation, in the region of Coari, Late Miocene-Pliocene age; and to the Iça Formation, Pleistocene age, based on the presence of Alnipollenites verus.The presence of Grimsdalea magnaclava indicates Middle Miocene age for the region Alto Solimões.The biostratigraphy signifi cance is preliminary discussed based on the recognition of certain guide species.Comparisons are performed taking into account coeval records in the basin.

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