Tectonic Blocks of Northern Mozambique: Integrating Geochronology and Aeromagnetics

Jamal, D.; Sahu, Bijaya Kumar; Wit, Maarten J. de

doi:10.3997/2214-4609-pdb.143.4.1

Cited by 3 publications

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“…This mobile belt has experienced 0.5 Ga granulite facies metamorphism and in many places also 1.0 Ga metamorphism. Further details of the anatomy and geochronology of this mobile belt is beyond the scope of this paper, and are analyzed elsewhere [Jamal et al, 2001;D. Jamal, thesis in preparation, 2004].…”

Section: Discussionmentioning

confidence: 99%

“…The tectono‐thermal history of the SGT south of the KKPTSZ records 0.5, 0.8, 1.0 and 1.6 Ga (Table 6) events in common with the Eastern Ghats (Table 7). Thus it is likely that these two domains of the Southern Indian Shield are conterminous, and possibly part of a greater Mesoproterozoic 1.0–1.3 Ga polycyclic mobile belt that can be traced westward in a Gondwana framework into northern Mozambique and Malawi [ Kröner , 2001; Jamal et al , 2001]. These events have been recorded only occasionally in Madagascar [ de Wit , 2003].…”

Section: Discussionmentioning

confidence: 99%

“…7, Major Faults/Shear Zones; label definitions are as follows: Ma1, Ampanihy; Ma2, Vorokafotra; Ma3, Tranamaro; Ma4, Bangalova‐Ranotsara; Ma5, Ifondiana‐Angavo; Ma6, Betsimisaraka; I1, Moyar‐Attur; I2, Palghat‐Cauvery; I3, Karur‐Kambam‐Painavu‐Trichur; I4; Cauvery‐Bhavani; I5, Dharmapuram; I6, Sileru; I7, Central Indian Shear Zone; A1, Boundary between Napier and Reyner Complexes; S1, Boundary between Highland Complex and Vijayan Complex. M01–M06, shear zones in Mozambique [ Jamal et al , 2001; D. Jamal, thesis in preparation, 2004]; M01–M04, unnamed; M05, Xixano‐Chivaro Shear Zone; M06, Lurio Shear Zone. 8, General structural trends in the Meso‐Neoproterozoic accreted terranes.…”

Section: Discussionmentioning

confidence: 99%

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Age and tectonic evolution of Neoproterozoic ductile shear zones in the Southern Granulite Terrain of India, with implications for Gondwana studies

2004

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The high‐grade rocks of the Southern Granulite Terrain (SGT) of Peninsular India are bounded to the north by the Archean Dharwar Craton. Another high‐grade terrane, the Mesoproterozoic Eastern Ghats, occurs to the northeast of the SGT. The tectonic relationship between these crustal domains is complex. We present new geochronological and structural data that indicate a continuation of the Dharwar Craton into the Southern Granulite Terrain as far south as a newly identified Neoproterozoic shear zone, here named the Karur‐Kamban‐Painavu‐Trichur Shear Zone (KKPTSZ). South of the KKPTSZ, Mesoproterozoic dates of the SGT are similar to those recorded in the Eastern Ghats, and the two domains may have been conterminous. Thirty‐three new U/Pb/Th single zircon and monazite dates of samples from six structural transects across the regional shear zones indicate that the SGT has experienced at least seven thermo‐tectonic events at 2.5 Ga, ∼2.0 Ga, ∼1.6 Ga, ∼1.0 Ga, ∼800 Ma, ∼600 Ma, and ∼550 Ma, and two distinct episodes of metasomatism/charnockitization between 2.50–2.53 and between 0.55–0.53 Ga. Deformation along a number of major shear zones in the SGT is Neoproterozoic to earliest Paleozoic in age, with an early phase (D2) concentrated between 700–800 Ma, and a later phase (D3) between 550 and 600 Ma. Major charnockitization (530–550 Ma) post dates D3, and is, in turn, overprinted by granitization, retrogression, and uplift between 525 and 480 Ma. The KKPTSZ, active between 560 and 570 Ma, is either a terrane boundary, or a tectonized décollement between cover and Archean basement rocks represented by predominantly paragneisses to the south and orthogneisses to the north, respectively. Other regional Neoproterozoic shear zones do not appear to separate allochthonous terranes as previously suggested on the basis of Nd model ages and Rb/Sr biotite/whole rock dates. The Neoproterozoic‐Cambrian tectonothermal history of the SGT and Eastern Ghats is similar to that recorded in parts of Madagascar, East Africa, and Antarctica, and is used to reconstruct parts of central Gondwana, here named the Deccan Continent, with more robust confidence.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Age and tectonic evolution of Neoproterozoic ductile shear zones in the Southern Granulite Terrain of India, with implications for Gondwana studies

2004

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“…The geology map of Madagascar was compiled from the studies of (Besairie & Collignon, 1972;Courrier and Lafont, 1987;Nessen et al, 1988: de Wit et al, 2001Rasoamalala et al, 2014;Tucker et al, 2014: Rekha et al, 2014 ( Figure 8). In addition, the Karrur Kambam, Palghat and Moyar shear zones are major structural markers in India (de Wit et al, 2001: Ghosh et al, 2004Rekha et al, 2014;Tucker et al, 2014;Reeves et al, 2014) whose conjugate structures (Ranostara, Angavo-Ifanadiana and Betsimisaraka Shear Zones) can be traced from Madagascar into India on the basis of similar geochronological history.…”

Section: Accepted Manuscript (D) India-madagascar Structure Of the Armentioning

confidence: 99%

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

Thompson

Moulin

Aslanian

et al. 2019

Earth-Science Reviews

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The amalgamation of Gondwana and its subsequent fragmentation has been a subject of several studies over the past five decades, yet the very important question of the initial geometry of the supercontinent remains enigmatic. Current reconstruction models of the Indian Ocean are characterized by large gaps, overlaps and misfits of major structural and Cratonic bodies in their fit, and positions of tectonic blocks that are inconsistent with field observations, a phenomenon sustained by inadequate data, long standing debates and a lack of consensus on the nature of major structures and basins in the ocean. Past attempts to reconstruct the initial fit of the ocean has led to varied and complex models, with their own logic and different geographical limits, whose validity and underlying assumptions require testing in the light of current global geological and geophysical data. Our analysis of these models and their consequences on the continental passive margins brings to the fore critical scientific questions and the incoherencies that exist between them. This paper presents a compressive study of the structure of the Precambrian basement, Paleozoic marginal and rift basins of the plates constituting the Indian Ocean, examining the architecture and geochronological composition of their composing Cratons and crustal blocks, and delineating important structural markers to juxtapose them in full-fit reconstructions. We introduce a new holistic model from Gondwana's initial geometry to Chron 34, achieved through a combination of onshore and offshore geological and geophysical data. Our new model is coherent with current data interpretations of major structures across the Indian Ocean. Consistent with the interpretation of the Beira High as continental crust, and recent seismic refraction interpretation of the Pamela MOZ3-5 expedition in the Northern Mozambique Ridge and Northern Natal Valley. The model also permits full extent of major cratonic, volcanic and sedimentary structures within the supercontinent, and presents a new synthesis upon which further work may be projected.

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Madagascar: Heads It’s a Continent, Tails It’s an Island

Wit

2003

Annu. Rev. Earth Planet. Sci.

247

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▪ Abstract Neither geologists nor biologists have a definition that is capable of classifying Madagascar unambiguously as an island or a continent; nor can they incorporate Malagasy natural history into a single model rooted in Africa or Asia. Madagascar is a microcosm of the larger continents, with a rock record that spans more than 3000 million years (Ma), during which it has been united episodically with, and divorced from, Asian and African connections. This is reflected in its Precambrian history of deep crustal tectonics and a Phanerozoic history of biodiversity that fluctuated between cosmopolitanism and parochialism. Both vicariance and dispersal events over the past 90 Ma have blended a unique endemism on Madagascar, now in decline following rapid extinctions that started about 2000 years ago.

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Tectonic Blocks of Northern Mozambique: Integrating Geochronology and Aeromagnetics

Cited by 3 publications

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Age and tectonic evolution of Neoproterozoic ductile shear zones in the Southern Granulite Terrain of India, with implications for Gondwana studies

Age and tectonic evolution of Neoproterozoic ductile shear zones in the Southern Granulite Terrain of India, with implications for Gondwana studies

New starting point for the Indian Ocean: Second phase of breakup for Gondwana

Madagascar: Heads It’s a Continent, Tails It’s an Island

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