Geological correlations between India and Madagascar in a Gondwanan perspective
1
Citation
0
Reference
8
Related Paper
Citation Trend
Cite
Cite
Citations (1)
Research Article| June 01, 1992 Madagascar: A continental fragment of the paleo-super Dharwar craton of India P. K. Agrawal; P. K. Agrawal 1Theoretical Geophysics Group, National Geophysical Research Institute, Hyderabad 500 007, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar O. P. Pandey; O. P. Pandey 1Theoretical Geophysics Group, National Geophysical Research Institute, Hyderabad 500 007, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar J. G. Negi J. G. Negi 1Theoretical Geophysics Group, National Geophysical Research Institute, Hyderabad 500 007, Andhra Pradesh, India Search for other works by this author on: GSW Google Scholar Geology (1992) 20 (6): 543–546. https://doi.org/10.1130/0091-7613(1992)020<0543:MACFOT>2.3.CO;2 Article history first online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation P. K. Agrawal, O. P. Pandey, J. G. Negi; Madagascar: A continental fragment of the paleo-super Dharwar craton of India. Geology 1992;; 20 (6): 543–546. doi: https://doi.org/10.1130/0091-7613(1992)020<0543:MACFOT>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The morphological kinship of Madagascar to its immediate neighbors on the west (African continent) and east (Indian subcontinent) during the Early and middle Cretaceous has been debated for the past two decades on the basis of available geologic, tectonic, and paleomagnetic information. Most of the paleoreconstructions of Madagascar have shown its attachment to the east African continent. We present magnetic satelite and gravity data, and morphological, geophysical, and geotectonic similarities to hypothesize that in the period before the breakup of Gondwana, Madagascar was a continental fragment of the paleo-super Dharwar craton of India. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Icon
Dharwar Craton
Cite
Citations (72)
Cite
Citations (0)
Sri Lanka occupies a unique geologic position in Gondwana. Recent age and isotopic data suggest that the high‐grade basement rocks of Sri Lanka are more closely associated with the southeastern part of Madagascar than with the Archean granulites of southern and eastern parts of India. The occurrences of gem minerals and graphite in the centrally located Highland Complex of Sri Lanka can also be correlated with those of the Kerala Khondalite Belt (KKB) at the southern tip of India and of southeast Madagascar south of the Ranotsara Shear Zone. These geological and mineralogical features indicate the juxtaposition of Sri Lanka with Madagascar and also with the Lützow‐Holm Bay area in Antarctica. The very close juxtaposition of Sri Lanka with Madagascar suggested here, which has hitherto been given only passing reference, implies that there exists a distinct mineralized belt running from Antarctica through the Highland Complex of Sri Lanka into Madagascar, Mozambique, Tanzania, and farther north. This mineral belt is clearly of Pan‐African origin and is now considered to be an important geosuture associated with the main Mozambique Belt. The position of Sri Lanka in Gondwana is of particular significance because Sri Lanka acts as a bridge across the main East African and Antarctica crustal fragments.
Sri lanka
Cite
Citations (85)
Cite
Citations (0)
Palaeogeography
Supercontinent
Basement
Cite
Citations (204)
In Northeast Africa and Arabia, the Pan African terrain is generally referred to as Arabian-Nubian Shield (ANS) and consist to a large degree of juvenile crustal material accreted to the ancient African margin during the period -900–700 Ma ago. The juvenile Pan-African rock assemblage of northern Eritrea is essentially similar to that found in the Tokar Terrane of the southern Red Sea Hills and consists largely of an association of bimodal metavolcanic rocks, minor metasediments and pre- syn- and post-tectonic granitoids. The age and geodynamic relationships of the various rock units in northern Malawi are still uncertain due to the apparent superposition of three mobile belts, namely the Ubendian, Irumide-Usagaran and Mozambique. The Precambrian rocks of Madagascar occur in several tectono-metamorphic terranes which are bounded by major shear zones and ophiolite belts. The high-grade metamorphic assemblages of southernmost India consist of a variety of granitoid gneisses, largely charnockitized, and granulite-grade supracrustal units dominated by metasediments.
Supercontinent
Sri lanka
Cite
Citations (15)
Recent work in central and northern Madagascar has identified five tectonic units of the East African Orogen (EAO), a large collisional zone fundamental to the amalgamation of Gondwana. These five units are the Antongil block, the Antananarivo block, the Tsaratanana sheet, the Itremo sheet, and the Bemarivo belt. Geochronological, lithological, metamorphic, and geochemical characteristics of these units and their relationships to each other are used as a type area to compare and contrast with surrounding regions of Gondwana. The Antananarivo block of central Madagascar, part of a broad band of pre‐1000‐Ma continental crust that stretches from Yemen through Somalia and eastern Ethiopia into Madagascar, is sandwiched between two suture zones we interpret as marking strands of the Neoproterozoic Mozambique Ocean. The eastern suture connects the Al‐Mukalla terrane (Yemen), the Maydh greenstone belt (northern Somalia), the Betsimisaraka suture (east Madagascar), and the Palghat‐Cauvery shear zone system (south India). The western suture projects the Al‐Bayda terrane (Yemen) through a change in crustal age in Ethiopia to the region west of Madagascar. Our new framework for the central EAO links the Mozambique belt with the Arabian/Nubian Shield and highlights the power of tectonic analysis in unraveling the complex tectonic collage of the EAO.
Cite
Citations (277)