Provenance and tectonic significance of the Palaeoproterozoic metasedimentary successions of central and northern Madagascar

被引：56

作者：

De Waele, B. ^{[1
,2
]}

Thomas, R. J. ^{[2
]}

Macey, P. H. ^{[3
]}

Horstwood, M. S. A. ^{[2
]}

Tucker, R. D. ^{[5
]}

Pitfield, P. E. J. ^{[2
]}

Schofield, D. I. ^{[2
]}

Goodenough, K. M. ^{[4
]}

Bauer, W. ^{[2
]}

Key, R. M. ^{[4
]}

Potter, C. J. ^{[5
]}

Armstrong, R. A. ^{[6
]}

Miller, J. A. ^{[7
]}

Randriamananjara, T. ^{[8
]}

Ralison, V. ^{[8
]}

Rafahatelo, J. M. ^{[8
]}

Rabarimanana, M. ^{[8
]}

Bejoma, M. ^{[9
]}

机构：

[1] SRK Consulting, Perth, WA 6005, Australia

[2] British Geol Survey, Keyworth NG12 5GG, Notts, England

[3] Council Geosci, Western Cape, South Africa

[4] British Geol Survey, Edinburgh, Midlothian, Scotland

[5] US Geol Survey, Reston, VA 20192 USA

[6] Australian Natl Univ, Canberra, ACT, Australia

[7] Univ Stellenbosch, ZA-7600 Stellenbosch, South Africa

[8] Projet Gouvernance Ressources Minieres, Antananarivo, Madagascar

[9] Univ Antananarivo, Antananarivo, Madagascar

来源：

PRECAMBRIAN RESEARCH | 2011年 / 189卷 / 1-2期

关键词：

U-Pb dating; Detrital provenance; East African Orogen; Gondwana; Palaeoproterozoic; Tectonics; PROTEROZOIC ITREMO GROUP; EAST-AFRICAN OROGEN; CONTINENTAL ARC MAGMATISM; U-PB GEOCHRONOLOGY; ZIRCON GEOCHRONOLOGY; AGE CONSTRAINTS; NW INDIA; EVOLUTION; GONDWANA; BELT;

D O I：

10.1016/j.precamres.2011.04.004

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

New detrital zircon U-Pb age data obtained from various quartzite units of three spatially separated supracrustal packages in central and northern Madagascar, show that these units were deposited between 1.8 and 0.8 Ga and have similar aged provenances. The distribution of detrital zircon ages indicates an overwhelming contribution of sources with ages between 2.5 and 1.8 Ga. Possible source rocks with an age of 2.5 Ga are present in abundance in the crustal segments (Antananarivo, Antongil and Masora Domains) either side of a purported Neoproterozoic suture ("Betsimisaraka Suture Zone"). Recently, possible source rocks for the 1.8 Ga age peak have been recognised in southern Madagascar. All three supracrustal successions, as well as the Archaean blocks onto which they were emplaced, are intruded by mid-Neoproterozoic magmatic suites placing a minimum age on their deposition. The similarities in detrital pattern, maximum and minimum age of deposition in the three successions, lend some support to a model in which all of Madagascar's Archaean blocks form a coherent crustal entity (the Greater Dharwar Craton), rather than an amalgamate of disparate crustal blocks brought together only during Neoproterozoic convergence. However, potential source terranes exist outside Madagascar and on either side of the Neoproterozoic sutures, so that a model including a Neoproterozoic suture in Madagascar cannot be dispelled outright. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：18 / 42

页数：25

共 96 条

[1]

ASHWAL LD, 1997, INT S FIELD WORKSH P, P53

[2]

BERTUCAT M, 1958, ETUDE GEOLOGIQUE PRO

[3]

BESAIRIE H, 1969, DESCRIPTION GEOLOGIQ, P73

[4]

Besairie H., 1964, Madagascar Carte Geologique 1:1 000 000 (3 sheets)

[5]

BESAIRIE H, 1970, DOCUMENTATION BURE D, V177, P86

[6]

BESAIRIE H, 1959, INT GEOL C, P47

[7]

BOUSTEYAK L, 1970, CARTE GEOLOGIQUE ANJ

[8]

BOUSTEYAK L, 1970, STRATIGRAPHIE MIGMAT

[9] Geothermobarometry and U-Pb Geochronology of metapelitic granulites and pelitic migmatites from the Lokoho region, Northern Madagascar [J].

Buchwaldt, R ;

Tucker, RD ;

Dymek, RF .

AMERICAN MINERALOGIST, 2003, 88 (11-12) :1753-1768

[10]

BUCHWALDT R, 2002, GEOL SOC AM 2002 ANN, P448

← 1 2 3 4 5 6 7 8 9 10 →