Arid
DOI10.1016/j.geomorph.2007.09.008
Late Pleistocene tectonic-geomorphological development within a passive margin - The Cariata trough, northeastern Brazil
Bezerra, Francisco H. R.1; Neves, Benjamim B. Brito2; Correa, Antonio C. B.3; Barreto, Alcina M. F.4; Suguio, Kenitiro5
通讯作者Bezerra, Francisco H. R.
来源期刊GEOMORPHOLOGY
ISSN0169-555X
出版年2008
卷号97期号:3-4页码:555-582
英文摘要

Studies on the geomorphological evolution of the South American passive margin have been based on the pediplanation model, which predicts that its morphology is a response to regional uniform uplift and concomitant development of erosion surfaces. We combined remote sensing, geological mapping, lithostratigraphic and facies analyses, and luminescence dating in the Cariata trough, northeastern Brazil, in order to determine how brittle tectonics and climate influenced colluviation and the shaping of local landforms in the Quaternary. Our work indicates that Cariata is an asymmetrical trough similar to 40 kin long, similar to 25 km wide, 250-550 m deep, and delimited by ENE-WSW-trending faults to the north and south. We recognized an ENE-WSW-oriented compression related to a strike-slip faulting regime, which corresponds to the present-day stress field in the region. This faulting event led to the deposition of colluvial fans, shed from adjacent uplifted crustal blocks, in a tectonically controlled depression. The colluvial succession is similar to 45 in thick and presents two facies assemblages that filled the southern and, in particular, the northern borders of the trough: non-cohesive debrisflow and mudflow deposits. Optically stimulated luminescence dates of the sedimentary infill yielded ages at 224-128 ka and 45-28 ka, dominated by debrisflow and mudflow deposits, respectively. These ages may be over-estimated due to poor bleaching of colluvium, but they and our field data suggest that the margins of the trough were tectonically uplifted and eroded twice in the Late Pleistocene. The spasmodic colluvial accretion reflects the occurrence of high-magnitude, low-recurrence episodes probably associated with climate shifts in a semi-arid hillslope system. It follows that the present-day low-lying piedmont in which the Cariata trough occurs is a juxtaposition of surfaces of various ages. This trough may have counterparts across the region. These conclusions do not corroborate the application of the cyclical pediplanation hypothesis in the area. (C) 2007 Elsevier B.V. All rights reserved.


英文关键词passive margin colluvium quaternary neotectonics luminescence dating
类型Review
语种英语
国家Brazil
收录类别SCI-E
WOS记录号WOS:000256719500020
WOS关键词FAULT-SLIP DATA ; NE BRAZIL ; CONTINENTAL MARGINS ; COLLUVIAL SEDIMENTS ; HILLSLOPE DEPOSITS ; WEST GREENLAND ; SOUTH-AFRICA ; DOSE-RATES ; LUMINESCENCE ; QUATERNARY
WOS类目Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向Physical Geography ; Geology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/157440
作者单位1.Univ Fed Rio Grande do Norte, Dept Geol, BR-59072970 Natal, RN, Brazil;
2.Univ Sao Paulo, Inst Geociencias, BR-05508080 Sao Paulo, Brazil;
3.Univ Fed Pernambuco, Dept Ciencias Geograf, BR-50740530 Recife, PE, Brazil;
4.Univ Fed Pernambuco, Dept Geol, BR-50740530 Recife, PE, Brazil;
5.Univ Guarulhos, Ctr Pos Grad Pesquisa & Extensao, BR-07023070 Sao Paulo, Brazil
推荐引用方式
GB/T 7714
Bezerra, Francisco H. R.,Neves, Benjamim B. Brito,Correa, Antonio C. B.,et al. Late Pleistocene tectonic-geomorphological development within a passive margin - The Cariata trough, northeastern Brazil[J],2008,97(3-4):555-582.
APA Bezerra, Francisco H. R.,Neves, Benjamim B. Brito,Correa, Antonio C. B.,Barreto, Alcina M. F.,&Suguio, Kenitiro.(2008).Late Pleistocene tectonic-geomorphological development within a passive margin - The Cariata trough, northeastern Brazil.GEOMORPHOLOGY,97(3-4),555-582.
MLA Bezerra, Francisco H. R.,et al."Late Pleistocene tectonic-geomorphological development within a passive margin - The Cariata trough, northeastern Brazil".GEOMORPHOLOGY 97.3-4(2008):555-582.
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