DOI: 10.1016/j.earscirev.2019.103002
论文题名: Stratigraphy and ages of four Early Silurian through Late Devonian, Early and Middle Mississippian glaciation events in the Parnaíba Basin and adjacent areas, NE Brazil
作者: Caputo M.V. ; Santos R.O.B.D.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 207 语种: 英语
中文关键词: Correlation
; Northeast Brazil
; Paleozoic glaciations/deglaciations
; Parnaíba Basin
英文关键词: age determination
; Devonian
; diamictite
; glaciation
; Mississippian
; palynology
; Silurian
; stratigraphy
; Brazil
; Parnaiba Basin
英文摘要: Turbidity currents, tectonism, debris flows, glaciation, and other geologic processes are considered to be responsible for the generation of Silurian–Mississippian diamictites in northern Brazil. Processes that best account for the features observed in these strata are glaciation, deglaciation and sedimentary deformation. Four main glacial ages are identified to have occurred in the Parnaíba Basin during the Paleozoic. Glacially influenced deposits are found in the Lower Silurian, Upper Devonian, Lower Mississippian, and Middle Mississippian strata. The Parnaíba Basin is characterized by outcrops providing robust lithological evidence for three glacial ages, identified by lithological features and dated by palynological studies. A fourth glaciation, as old as Tournaisian, was recently recognized only in the subsurface of the basin. The glacial features were illustrated and the rocks accurately dated with palynomorphs based on very accurate palynological studies. Additional, palynological information, derives from outcrops and shallow boreholes drilled by a private company (Themag) and the National State Mineral Production Department (Departamento Nacional de Produção Mineral -DNPM), and the Brazilian Geological Survey Company (Companhia de Pesquisa de Recursos Minerais-CPRM). The purpose of this reexamination, including many new illustrations, interpretations and conclusions, is to evaluate primary sedimentological and paleontological data related to the above mentioned glaciations. Some authors remain skeptical about the record of Early to early Late Paleozoic glaciations in western Gondwana, especially in Brazil, mainly because evidence provided in the literature is relatively scanty. The Parnaíba Basin provides special conditions for the study of these glaciations, although evidence for each of them varies considerably as discussed in the text. © 2019 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166023
Appears in Collections: 气候变化与战略
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作者单位: Universidade Federal do Pará (UFPA), Instituto de Geociências, Faculdade de Geologia, Brazil; Independent Consulting, Structural Geology and Geotectonic, Brazil
Recommended Citation:
Caputo M.V.,Santos R.O.B.D.. Stratigraphy and ages of four Early Silurian through Late Devonian, Early and Middle Mississippian glaciation events in the Parnaíba Basin and adjacent areas, NE Brazil[J]. Earth Science Reviews,2020-01-01,207