Serra da Cangalha

Short description: Impact crater in Brazil

Serra da Cangalha

Serra da Cangalha crater

Impact crater/structure
Confidence| Confirmed
Diameter| 12–13 km (7.5–8.1 mi)
Age| <300 Ma
Exposed| Yes
Drilled| Yes
Location
Location| Parnaíba Basin
Coordinates|  [ ⚑ ] : 8°5′S 46°52′W﻿ / ﻿8.083°S 46.867°W﻿ / -8.083; -46.867
Country| Brazil
State| Tocantins

Location of the crater in Brazil

Serra da Cangalha is an impact crater in the State of Tocantins, near the border of Maranhão State, in north/northeastern Brazil.[1] The crater is between 12 and 13 kilometres (7.5 and 8.1 mi) in diameter, making it the second-largest known crater in Brazil.[2] Its age is estimated to be about 220 million years (Triassic period).[3] The name means Pack-Saddle Mountains in Portuguese.

## Contents

* 1 Description
* 2 History and studies
* 3 See also
* 4 References

## Description

The outer perimeter is a circular inward scarp about 12 kilometres (7.5 mi) in diameter on the largely undisturbed Cretaceous and upper Silurian sediments of the Parnaíba basin,[4] breached on the west, north, and south sides by drainage valleys. Within the perimeter there is a series of concentric circular valleys and a central basin, all at roughly the same elevation, separated by ring walls. Shuttle Radar Topography Mission imagery shows a faint ring about 11 kilometres (6.8 mi) in diameter, a second ring of gentle hills about 5 to 6 kilometres (3.1 to 3.7 mi) in diameter, and an inner ring of steeper hills, about 3 kilometres (1.9 mi) in diameter and up to 420 metres (1,380 ft) high, open to the northwest, surrounding a central basin about 2.2 kilometres (1.4 mi) in diameter.[5][6][7]

The impact origin is attested by the presence of impact breccias, quartzite shatter cones and shocked quartz. The meteorite is believed to have struck the surface at a low oblique angle, 25 to 30 degrees on dry land. Radial faults are present inside the crater, and some extend up to 16 km from the center.[7] Disturbed and steeply inclined sediments from the Carboniferous and Devonian periods occur within the crater. A magnetic survey of the structure indicates that deformation within the crater extends to a depth of about 2 kilometres (1.2 mi).[3][5][6][8][9]

## History and studies

The identification of the structure as an impact crater was first published in 1973 by R.S. Dietz and B.M. French.[10][11] Shatter cones were reported by Beatty in 1980.[12] Impact breccias, impact melting, and shocked quartz were reported by McHone in his 1986 thesis.[13] A magnetic survey of the structure was published by A.A. Adepelumi and others in 2005.[6]

## See also

* Riachão Ring
* Santa Marta crater

## References

1. ↑ "Serra da Cangalha". Earth Impact Database. Planetary and Space Science Centre University of New Brunswick Fredericton. http://www.passc.net/EarthImpactDatabase/New website_05-2018/serra-da-cangalha.html. Retrieved 2017-10-09.
2. ↑ McHone, J. F.; Dietz, R. S. (1992). "Earth's multiple impact craters and astroblemes (abstract)". Houston: Lunar and Planetary Institute. pp. 887–888. Bibcode: 1992LPI....23..887M.
3. ↑ 3.0 3.1 R. Almeida Filho; F.R. Moreira; C.H.Beisl (2003). "The Serra da Cangalha astrobleme as revealed by ASTER and SRTM orbital data". International Journal of Remote Sensing 24: 1–6. http://mtc-m12.sid.inpe.br/col/sid.inpe.br/sergio/2005/06.17.18.34/doc/raimundo4.pdf. Retrieved 2007-09-24.
4. ↑ De Castro, David L.; Fuck, Reinhardt A.; Phillips, Jeffrey D.; Vidotti, Roberta M.; Bezerra, Francisco H. R.; Dantas, Elton L. (2014). "Crustal structure beneath the Paleozoic Parnaíba Basin revealed by airborne gravity and magnetic data, Brazil on USGS". Tectonophysics 614: 18. doi:10.1016/j.tecto.2013.12.009. https://pubs.er.usgs.gov/publication/70118240.
5. ↑ 5.0 5.1 R. Gregio. "Cratera da Serra da Cangalha". http://rgregio.astrodatabase.net/cratera_serra_cangalha.htm.
6. ↑ 6.0 6.1 6.2 Adepelumi, A. A.; Fontes, S.L.; Schnegg, P.A.; Flexor,J.M. (2005). "An integrated magnetotelluric and aeromagnetic investigation of the Serra da Cangalha impact crater, Brazil". Physics of the Earth and Planetary Interiors 150 (1): 159–182. doi:10.1016/j.pepi.2004.08.029. Bibcode: 2005PEPI..150..159A. http://doc.rero.ch/record/5061/files/1_Schnegg_Pierre-Andr___-_An_integrated_magnetotelluric_20050905.pdf.
7. ↑ 7.0 7.1 W.U. Reimold; G.R.J. Cooper; R. Romano; D. Cowan; C. Koeberl (2004). "A SRTM Investigation of Serra da Cangalho [sic] Impact Structure, Brazil". http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1232.pdf. Retrieved 2007-09-24.
8. ↑ W. Masero; P.-A. Schnegg; S.L. Fontes. Magnetotelluric investigation of the Serra da Cangalha impact crater, Northeast Brazil.
9. ↑ Adekunle Adepelumi; Jean M. Flexor; Sergio L. Fontes; Pierre-A. Schnegg. "A magnetotelluric investigation of the Serra da Cangalha impact crater structure, Brazil".
10. ↑ Dietz, R.S.; French, B.M. (1973). "Two probable astroblemes in Brazil". Nature 244 (5418): 561–562. doi:10.1038/244561a0. Bibcode: 1973Natur.244..561D.
11. ↑ Crósta, A. P. (1987). J. Pohl. ed. "Impact structures in Brazil". Research in Terrestrial Impact Structures (Braunschweig/Wiesbad: Friedrich, Vieweg & Sohn): 30–38. doi:10.1007/978-3-663-01889-6_2. ISBN 978-3-663-01891-9. Bibcode: 1987rtis.conf...30C.
12. ↑ Beatty J. K. (1980). "Crater hunting in Brazil". Sky and Telescope 59: 464––467. Bibcode: 1980S&T....59..464B.
13. ↑ McHone J. F. (1986). Terrestrial impact structures: Their detection and verification with new examples from Brazil. University of Illinois at Urbana-Champaign, Urbana, Illinois. p. 210.

* v
* t
* e

Impact cratering on Earth

* Impact crater
* Impact event

Lists|

* Worldwide
* Africa
* Antarctica
* Asia
* Australia
* Europe
* North America
* South America
* By country

Confirmed

≥20 km diameter|

* Acraman
* Amelia Creek
* Araguainha
* Beaverhead
* Boltysh
* Carswell
* Charlevoix
* Chesapeake Bay
* Chicxulub
* Clearwater East & West
* Gosses Bluff
* Haughton
* Kamensk
* Kara
* Karakul
* Keurusselkä
* Lappajärvi
* Logancha
* Manicouagan
* Manson
* Mistastin
* Mjølnir
* Montagnais
* Morokweng
* Nördlinger Ries
* Obolon'
* Popigai
* Presqu'île
* Puchezh-Katunki
* Rochechouart
* Saint Martin
* Shoemaker
* Siljan Ring
* Slate Islands
* Steen River
* Strangways
* Sudbury
* Tookoonooka
* Tunnunik
* Vredefort
* Woodleigh
* Yarrabubba

Topics|

* Alvarez hypothesis
* Australite
* Breccia
* Coesite
* Complex crater
* Cretaceous–Paleogene boundary
* Cryptoexplosion
* Ejecta blanket
* Impact crater
* Impact structure
* Impactite
* Late Heavy Bombardment
* Lechatelierite
* Meteorite
* Moldavite
* Ordovician meteor event
* Philippinite
* Planar deformation features
* Shatter cone
* Shock metamorphism
* Shocked quartz
* Stishovite
* Suevite
* Tektite

Research|

* Baldwin, Ralph Belknap
* Barringer, Daniel
* Barringer Medal
* Chao, Edward C T
* Dietz, Robert S
* Hartmann, William K
* Melosh, H Jay
* Ryder, Graham
* Schultz, Peter H
* Shoemaker, Eugene
* Earth Impact Database
* Impact Field Studies Group
* Lunar and Planetary Institute
* Traces of Catastrophe

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Serra da Cangalha. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Earth:Serra_da_Cangalha&oldid=248610"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template