FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1664187828> ?p ?o ?g. }

• W1664187828 abstract "Sutures between continental plates/blocks provide key evidence for the existence of former oceans and for collisional tectonics throughout the geological record. The correct identification and delineation of these sutures is of critical importance for regional tectonic models and, as these suture zones themselves host economically important lithologies (ultramafic pods) and are important conduits for the mobilisation of precious metals, such identification can be of tremendous economic value. Unfortunately, the correct identification of suture zones in the Precambrian is hampered by various factors. The majority of sutures recorded in the literature are located in the upper crust of orogens, where the sutures have a greenschist grade of metamorphism and therefore have an identifiable anatomy that can be directly related to present-day suture zones. Older orogens have, however, invariably been highly eroded to expose predominant granulite and high amphibolite tonalite-trondhjemitegranodiorite (TTG) gneisses, as in Madagascar, and lack modern equivalents for comparison. This, together with the poor preservation of diagnostic rock assemblages (e.g. eclogite, whiteschist) adds to the difficulty in identifying ancient sutures. In current tectonic models, Madagascar comprises two Archaean toPalaeoproterozoic crustal provinces, the Anatananarivo and Antongil blocks, separated by a purported north-south Betsimisaraka suture. An east-west suture separates these older units from a younger arc terrane, the Bemarivo Block, to the north. Due to deep weathering profiles and a lack of accessible critical sections, there is very little tangible evidence for the presence of these sutures in the field. Moreover, the age data reported in the literature show a desperate shortage of data for central and northern Madagascar. Recent zircon U-Pb SHRIMP dating has confirmed that the Antongil Block comprises igneous components of 3.2 and 2.5 Ga, while in the Antananarivo Block only magmatic units of around 2.5 Ga occur. In the Antananarivo Block these Archaean units have been intruded by younger plutons at ~800 and ~550 Ma. Both the Antananarivo and Antongil blocks were strongly affected by a thermal/metamorphic event at around 550 Ma. Ages on granitoids and volcanic units in the Bemarivo Block to the north indicate a plutono-volcanic event at ~720 Ma, with no record of inheritance. The data so far thus shows some similarities between the Antongil and Antananarivo Block, which both record profuse crustal growth at 2.5 Ga. The lack of recorded 3.18 Ga dates to the west of the possible suture zone may merely reflect a scarcity of data on the Antananarivo Block, upon which further geochronological work is ongoing. The Bemarivo Block has been confirmed as a ~720 Ma arc terrane, in which a lack of Archaean inheritance suggests it to be exotic to the Antananarivo-Antongil blocks until its final docking at ~550 Ma. Work is in progress to characterise the detrital age populations of supracrustal units of central and northern Madagascar, in an effort to fingerprint the different terranes and thus reveal the cryptic sutures between the Antananarivo, Antongil and Bemarivo blocks." @default.
• W1664187828 created "2016-06-24" @default.
• W1664187828 creator A5024002709 @default.
• W1664187828 creator A5028544100 @default.
• W1664187828 creator A5040392626 @default.
• W1664187828 creator A5044567678 @default.
• W1664187828 creator A5052322422 @default.
• W1664187828 creator A5055384255 @default.
• W1664187828 creator A5062626457 @default.
• W1664187828 creator A5077676441 @default.
• W1664187828 creator A5084065512 @default.
• W1664187828 date "2007-08-01" @default.
• W1664187828 modified "2023-09-27" @default.
• W1664187828 title "The chronology of central and north Madagascar" @default.
• W1664187828 hasPublicationYear "2007" @default.
• W1664187828 type Work @default.
• W1664187828 sameAs 1664187828 @default.
• W1664187828 citedByCount "0" @default.
• W1664187828 crossrefType "journal-article" @default.
• W1664187828 hasAuthorship W1664187828A5024002709 @default.
• W1664187828 hasAuthorship W1664187828A5028544100 @default.
• W1664187828 hasAuthorship W1664187828A5040392626 @default.
• W1664187828 hasAuthorship W1664187828A5044567678 @default.
• W1664187828 hasAuthorship W1664187828A5052322422 @default.
• W1664187828 hasAuthorship W1664187828A5055384255 @default.
• W1664187828 hasAuthorship W1664187828A5062626457 @default.
• W1664187828 hasAuthorship W1664187828A5077676441 @default.
• W1664187828 hasAuthorship W1664187828A5084065512 @default.
• W1664187828 hasConcept C105702510 @default.
• W1664187828 hasConcept C109007969 @default.
• W1664187828 hasConcept C112764850 @default.
• W1664187828 hasConcept C127313418 @default.
• W1664187828 hasConcept C146588470 @default.
• W1664187828 hasConcept C149347711 @default.
• W1664187828 hasConcept C150999391 @default.
• W1664187828 hasConcept C151730666 @default.
• W1664187828 hasConcept C173776410 @default.
• W1664187828 hasConcept C17409809 @default.
• W1664187828 hasConcept C18142444 @default.
• W1664187828 hasConcept C1965285 @default.
• W1664187828 hasConcept C2777327002 @default.
• W1664187828 hasConcept C37045145 @default.
• W1664187828 hasConcept C71924100 @default.
• W1664187828 hasConcept C77928131 @default.
• W1664187828 hasConceptScore W1664187828C105702510 @default.
• W1664187828 hasConceptScore W1664187828C109007969 @default.
• W1664187828 hasConceptScore W1664187828C112764850 @default.
• W1664187828 hasConceptScore W1664187828C127313418 @default.
• W1664187828 hasConceptScore W1664187828C146588470 @default.
• W1664187828 hasConceptScore W1664187828C149347711 @default.
• W1664187828 hasConceptScore W1664187828C150999391 @default.
• W1664187828 hasConceptScore W1664187828C151730666 @default.
• W1664187828 hasConceptScore W1664187828C173776410 @default.
• W1664187828 hasConceptScore W1664187828C17409809 @default.
• W1664187828 hasConceptScore W1664187828C18142444 @default.
• W1664187828 hasConceptScore W1664187828C1965285 @default.
• W1664187828 hasConceptScore W1664187828C2777327002 @default.
• W1664187828 hasConceptScore W1664187828C37045145 @default.
• W1664187828 hasConceptScore W1664187828C71924100 @default.
• W1664187828 hasConceptScore W1664187828C77928131 @default.
• W1664187828 hasLocation W16641878281 @default.
• W1664187828 hasOpenAccess W1664187828 @default.
• W1664187828 hasPrimaryLocation W16641878281 @default.
• W1664187828 hasRelatedWork W1598514274 @default.
• W1664187828 hasRelatedWork W1976629594 @default.
• W1664187828 hasRelatedWork W2076836582 @default.
• W1664187828 isParatext "false" @default.
• W1664187828 isRetracted "false" @default.
• W1664187828 magId "1664187828" @default.
• W1664187828 workType "article" @default.