Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.sedgeo.2016.05.012 |
Pedogenic calcretes within fracture systems and beddings in Neoproterozoic limestones of the Irece Basin, northeastern Brazil | |
Borges, S. V. F.1,2; Balsamo, F.3; Vieira, M. M.2; Iacumin, P.4; Srivastava, N. K.2; Storti, F.3; Bezerra, F. H. R.2 | |
通讯作者 | Borges, S. V. F. |
来源期刊 | SEDIMENTARY GEOLOGY
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ISSN | 0037-0738 |
EISSN | 1879-0968 |
出版年 | 2016 |
卷号 | 341页码:119-133 |
英文摘要 | Calcretes or caliches are continental limestones developed by surficial weathering process that takes place mostly in arid and semi-arid regions. In the Irece Basin, northeastern Brazil, in addition to the regular occurrence of pedogenic calcretes, a peculiar type of structurally controlled calcretes occurs on Neoproterozoic limestones. These peculiar calcretes developed near the surface and occur (1) between layers, (2) inside fractures and (3) within major thrust faults. Fieldwork on selected outcrops was integrated with petrographic, mineralogic, geochemical, density and mercury intrusion porosity analyses to constrain the environment of formation and their petrophysical properties. The results revealed that this type of calcrete is the product of multiepisodic events of dissolution and precipitation occurring during the wet and dry seasons in the region along fractures and beddings. Based on the petrophysical results, we suggest that these calcretes may have an important role in the migration of fluids through the impermeable host carbonate rock and that they act as a conduit for fluid flow, as revealed by their high porosity (mean value = 26%) and remarkable pore connectivity. (C) 2016 Elsevier B.V. All rights reserved. |
英文关键词 | Caliches Calcretes Pathway for fluid flow Calcretes working as conduit flow along previous structures Irece Basin, northeastern Brazil Caliches and calcretes along fracture systems and beddings |
类型 | Article |
语种 | 英语 |
国家 | Brazil ; Italy |
收录类别 | SCI-E |
WOS记录号 | WOS:000381540200008 |
WOS关键词 | UNA GROUP |
WOS类目 | Geology |
WOS研究方向 | Geology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/196381 |
作者单位 | 1.Inst Fed Educ Ciencia & Tecnol Rio Grande Norte, Natal, RN, Brazil; 2.Univ Fed Rio Grande do Norte, Programa Posgrad Ciencia & Engn Petr, Natal, RN, Brazil; 3.Univ Parma, Dipartimento Fis & Sci Terra Macedonia Melloni, Next Nat & Expt Tecton Res Grp, Parma, Italy; 4.Univ Parma, Dipartimento Fis & Sci Terra Macedonia Melloni, Parma, Italy |
推荐引用方式 GB/T 7714 | Borges, S. V. F.,Balsamo, F.,Vieira, M. M.,et al. Pedogenic calcretes within fracture systems and beddings in Neoproterozoic limestones of the Irece Basin, northeastern Brazil[J],2016,341:119-133. |
APA | Borges, S. V. F..,Balsamo, F..,Vieira, M. M..,Iacumin, P..,Srivastava, N. K..,...&Bezerra, F. H. R..(2016).Pedogenic calcretes within fracture systems and beddings in Neoproterozoic limestones of the Irece Basin, northeastern Brazil.SEDIMENTARY GEOLOGY,341,119-133. |
MLA | Borges, S. V. F.,et al."Pedogenic calcretes within fracture systems and beddings in Neoproterozoic limestones of the Irece Basin, northeastern Brazil".SEDIMENTARY GEOLOGY 341(2016):119-133. |
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