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Tectonic evolution of an Early Cryogenian late magmatic

Central and southern Madagascar comprise a nuer of distinctive Archaean crustal blocks the AntongilMasora and Antananarivo domains overlain by Proterozoic supracrustal sequences preserved in the East African Orogen Here we present UPb and LuHf isotopic data for two supracrustal units from detrital and metamorphic zircon grains The lower sequence is

MidNeoproterozoic arc magmatism in the northeastern

201451 Zircon U–Pb data from granitoids of Indochina Block which show ages ranging from 754 to 767 Ma The Hf isotopic data and geochemical signatures suggest calcalkaline magmas generated in a subductionrelated setting We propose the juxtaposition of India and Indochina in the Gondwana reconstruction

Evolving Marginal Terranes During Neoproterozoic

2019524 Zircon standards were analyzed before and during the analysis of unknowns to assess instrument performance and stability The primary zircon standard Mud Tank was used and yielded a mean 176 Hf/ 177 Hf ratio of 0282499 ± 0000015 2SD This is within uncertainty of the published value of 0282504 ± 0000044 2SD by Woodhead and Hergt

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A reevaluation of the Kumta Suture in western peninsular

2018515 Multidimensional scaling of detrital zircon data from various terranes in Madagascar and India together with ε Hf t data indie that the Karwar Block correlates with the western Dharwar Craton and is not a component of the Antananarivo Domain of central Madagascar as was suggested in IshwarKumar et al 2013

Adelaide Research Scholarship Tectonic evolution of

201993 We have used detrital zircon U–Pb and Lu–Hf isotopes to constrain the loion of this suture We propose that the Karwar Block of western peninsular India is an extension of the western Dharwar Craton and not part of the Antananarivo Domain of Madagascar as has been suggested in some models

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Evolving Marginal Terranes During Neoproterozoic

2019524 Zircon standards were analyzed before and during the analysis of unknowns to assess instrument performance and stability The primary zircon standard Mud Tank was used and yielded a mean 176 Hf/ 177 Hf ratio of

Neoproterozoic Low‐δ18O Zircons Revisited

202129 Block was initially welded together along the nearly W‐E trending Jiangnan Orogen between the Yangtze and haysia blocks Wang Zhou et al 2014 Nevertheless compared with the Yangtze Block no low‐δ18O magma or zircon has so far been reported from the haysia Block Furthermore the timing of

Petrology and Geochemistry of Cretaceous Mafic and

2011120 Kröner A Hegner E Collins AS Windley BF Brewer TS Razakamanana T Pidgeon RT 2000 Age and magmatic history of the Antananarivo Block Central Madagascar as derived from zircon geochronology and Nd isotopic systematics Am

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From Closure of the Mozaique Ocean to Gondwana

202095 Abstract A multi‐thermochronometer study of basement rocks using coined Pb‐Pb zircon U‐Th‐total Pb monazite U‐Pb SHRIMP titanite 40Ar/39Ar biotite and apatite fission track data was performed to derive a detailed cooling history for the Vohibory terrane southwest Madagascar The main metamorphism at ca 640–610 Ma is interpreted to represent the

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Geochronology and Petrogenesis of the Cretaceous

2005101 Abstract The Antampoato–Aatovy complex is the largest intrusion in the central–eastern part of the Cretaceous flood basalt province of Madagascar with an exposed surface area of about 80 km 2It has an 40 Ar/ 39 Ar incremental heating age of 899 ± 04 Ma and a U–Pb age of 90 ± 2 Ma The outcropping plutonic rocks range from dunite and wehrlite

CAS

SHRIMP zircon UPb geochronological and wholerock geochemical evidence for an early Neoproterozoic Sibaoan magmatic arc along the southeastern margin of the Yangtze Block Gondwana Res 12 144156

From Closure of the Mozaique Ocean to Gondwana

202095 Abstract A multi‐thermochronometer study of basement rocks using coined Pb‐Pb zircon U‐Th‐total Pb monazite U‐Pb SHRIMP titanite 40Ar/39Ar biotite and apatite fission track data was performed to derive a detailed cooling history for the Vohibory terrane southwest Madagascar The main metamorphism at ca 640–610 Ma is interpreted to represent the

Mineral Specimens / Africa Tsumeb Fabre Minerals

20191213 The locality is totally new and even though Madagascar is a wellknown mineralogical paradise there were no other references to Fluorite occurrences other than the small crystals included in Quartz from

Evolving Marginal Terranes During Neoproterozoic

2019524 Zircon standards were analyzed before and during the analysis of unknowns to assess instrument performance and stability The primary zircon standard Mud Tank was used and yielded a mean 176 Hf/ 177 Hf ratio of 0282499 ± 0000015 2SD This is within uncertainty of the published value of 0282504 ± 0000044 2SD by Woodhead and Hergt

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Mineral Specimens / Africa Tsumeb Fabre Minerals

20191213 The locality is totally new and even though Madagascar is a wellknown mineralogical paradise there were no other references to Fluorite occurrences other than the small crystals included in Quartz from

MidNeoproterozoic arc magmatism in the northeastern

201451 The Indochina block is separated from the Yangtze block to the east by the Ailaoshan–Jinshajiang AilaoshanRed River strikeslip fault which continues as the Day Nui Con Voi fault in northern Vietnam eg Tapponnier et al 1990 Schärer et al 1990 Leloup and Kienast 1993 Leloup et al 1995 and from the Sibumasu block to the west by the

Petrology and Geochemistry of Cretaceous Mafic and

2011120 Kröner A Hegner E Collins AS Windley BF Brewer TS Razakamanana T Pidgeon RT 2000 Age and magmatic history of the Antananarivo Block Central Madagascar as derived from zircon geochronology and Nd isotopic systematics Am

Neoproterozoic Low‐δ18O Zircons Revisited

202129 Block was initially welded together along the nearly W‐E trending Jiangnan Orogen between the Yangtze and haysia blocks Wang Zhou et al 2014 Nevertheless compared with the Yangtze Block no low‐δ18O magma or zircon has so far been reported from the haysia Block Furthermore the timing of

PDF Neoproterozoic extension in the Greater Dharwar

201121 Summary of UPb zircon ages central Madagascar a Tectonic domains of the Malagasy shield exposed Precarian rocks after BGS et al 2008 CGS 2009a 2009b and GAFBGR 2008