Arid
DOI10.1016/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
ISSN0037-0738
EISSN1879-0968
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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