Arabian Shield magmatic cycles and their relationship with Gondwana assembly: Insights from zircon U–Pb and Hf isotopes

Robinson, Frank A.; Foden, John; Collins, Alan S.; Payne, Justin L.

doi:10.1016/j.epsl.2014.10.010

Cited by 123 publications

(94 citation statements)

References 40 publications

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“…Anorogenic suites are also A-type granites, but they are derived from a distinct heavy rare earth element (HREE)-enriched source and are interpreted to be emplaced in back-arc settings and associated with lithospheric delamination. Taking this diversity into account, this study will maintain the island arc, synorogenic, postorogenic, and anorogenic phases defined by Robinson et al (2014) and use these as a systematic way to present the zircon geochemistry from 19 samples and support the tectonic models discussed in Robinson et al (2015). The geochronological and geochemical properties of these samples are summarized in table 1.…”

Section: Arabian Shield Geologic Settingmentioning

confidence: 99%

“…Recent Arabian Shield geochronological data from Robinson et al (2014) distinguished island arc (845 Ma), synorogenic (∼715-710 Ma), postorogenic (∼640-600 Ma), and anorogenic (!600 Ma) magmatism ( fig. 1).…”

Section: Arabian Shield Geologic Settingmentioning

confidence: 99%

“…Prior work (e.g., Pupin 1980;Belousova et al 2006) has shown a systematic response in zircon crystal morphology both to temperature of crystallization and to magma chemistry. The zircon morphology from island arc, synorogenic, and postorogenic granites in this study are coupled to U-Pb data from Robinson et al (2014), which led to identification of discrete ages in this study. These discrete ages are used in a fashion similar to that in Gagnevin et al (2011) and Schaltegger et al (2002) to infer magmatic pulsing from lower crustal sources, which are quite distinct from the anorogenic A-types associated with an enriched, limited crust-mantle source.…”

Section: Introductionmentioning

confidence: 99%

“…Zircon geochemical data are presented from the four discrete granite evolution stages outlined by Robinson et al (2014): (1) the island arc stage (∼845 Ma), (2) the synorogenic stage (∼715-700 Ma), (3) the postorogenic stage (∼640-600 Ma), and (4) the late anorogenic stage (!600 Ma). The zircon geochemistry in this study is linked with prior wholerock data from Robinson et al (2015) with the aim of identifying trace element discriminators that support the progressive changes in granitic sources during the accretion and cratonization of the ANS.…”

Section: Introductionmentioning

confidence: 99%

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Zircon Geochemical and Geochronological Constraints on Contaminated and Enriched Mantle Sources beneath the Arabian Shield, Saudi Arabia

Robinson

Foden

Collins

2015

The Journal of Geology

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A B S T R A C TArabian Shield granitic zircon geochemistry provides insight into the petrogenetic processes involved in generating one of the planet's largest tracts of juvenile Neoproterozoic crust. New zircon geochemistry supports previous U-Pb and whole-rock data that defined four magmatic groups: (1) ∼870-675 Ma island arc and synorogenic I-type granitoids (IA1Syn), (2) ∼640-585 Ma I-and A-type granitoids from the Nabitah and Halaban Suture (NHSG), (3) ∼610-600 Ma postorogenic perthitic (hypersolvus) A-type granitoids (POPG), and (4) !600 Ma anorogenic aegirine-bearing perthitic (hypersolvus) A-type granitoids (AAPG). The low Nb (∼1-300 ppm) and intrasuite rare earth element variation in IA1Syn and NHSG zircons indicates that these suites are derivatives of contaminated mantle followed by fractionation. AAPG suites, however, have higher Nb content (∼10-400 ppm) and are derived from limited crust-enriched mantle interaction. Each of the IA, Syn, and NHSG suites have discrete granite subsuites distinguished using zircon morphology and geochemistry whose U-Pb ages in each case form three groups. The IA subgroups are ∼867, ∼847, and ∼829 Ma; the Syn subgroups are ∼730, 716, and 696 Ma; and the NHSG subgroups are ∼636, ∼610, and ∼594 Ma. This apparent subevent repetition suggests some form of magmatic pulsing in the Arabian Shield. It is suggested that IA1Syn suites reflect typical volcanic arc granite settings and incremental subduction/accretion of eastward-migrating oceanic fragments of the East African Orogen. The appearance of ∼636 Ma A-type magmatism within suture zones (NHSG) is possibly derived from a long-lived (∼50 m.yr.) melting, assimilation, storage, and homogenization (MASH) zone resulting from an ∼640 Ma slab tear. These A-types are distinguished from more-enriched anorogenic (!600 Ma) A-types, possibly associated with lithospheric delamination.

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Section: Arabian Shield Geologic Settingmentioning

confidence: 99%

Section: Arabian Shield Geologic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Zircon Geochemical and Geochronological Constraints on Contaminated and Enriched Mantle Sources beneath the Arabian Shield, Saudi Arabia

Robinson

Foden

Collins

2015

The Journal of Geology

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“…In the Madagascar, this orogenic event termed as Malagasy orogeny by is attributed to the collision between India and the previously amalgamated Congo/Tanzania/Bangweulu-Azania Block. Northward continuity of this orogen and related suture zone (Palghat-Cauvery Suture in India and Betsimisaraka Suture in Madagascar) into Arabia are inferred by several researchers (Collins, 2006;Cox et al, 2012;Robinson, Foden, Collins, & Payne, 2014). Considering the inferred latest Neoproterozoic-early Cambrian palaeogeographic setting Figure 9.…”

Section: Relationship Of the Granulite-facies Metamorphisms With The mentioning

confidence: 99%

Late Neoproterozoic granulite facies metamorphism in the Menderes Massif, Western Anatolia/Turkey: implication for the assembly of Gondwana

Koralay

2015

Geodinamica Acta

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The Menderes Massif is a major polymetamorphic complex in Western Turkey. The late Neoproterozoic basement consists of partially migmatized paragneisses and metapelites in association with orthogneiss intrusions. Pelitic granulite, paragneiss and orthopyroxene-bearing orthogneiss (charnockite) of the basement series form the main granulite-facies lithologies. Charnockitic metagranodiorite and metatonalite are magnesian in composition and show calc-alkalic to alkali-calcic affinities. Nd and Sr isotope systematics indicate homogeneous crustal contamination. The zircons in charnockites contain featureless overgrowth and rim textures representing metamorphic growth on magmatic cores and inherited grains. Charnockites yield crytallization age of~590 Ma for protoliths and they record granulite-facies overprint at~580 Ma. These data indicate that the Menderes Massif records late Neoproterozoic magmatic and granulite-facies metamorphic events. Furthermore, the basement rocks have been overprinted by Eocene Barrovian-type Alpine metamorphism at~42 Ma. The geochronological data and inferred latest Neoproterozoic-early Cambrian palaeogeographic setting for the Menderes Massif to the north of present-day Arabia indicate that the granulite-facies metamorphism in the Menderes Massif can be attributed to the Kuunga Orogen (600-500 Ma) causing the final amalgamation processes for northern part of the Gondwana.

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The evolution of a Gondwanan collisional orogen: A structural and geochronological appraisal from the Southern Granulite Terrane, South India

et al. 2015

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Gondwana amalgamated along a suite of Himalayan-scale collisional orogens, the roots of which lace the continents of Africa, South America, and Antarctica. The Southern Granulite Terrane of India is a generally well-exposed, exhumed, Gondwana-forming orogen that preserves a record of the tectonic evolution of the eastern margin of the East African Orogen during the Ediacaran-Cambrian (circa 600-500 Ma) as central Gondwana formed. The deformation associated with the closure of the Mozambique Ocean and collision of the Indian and East African/Madagascan cratonic domains is believed to have taken place along the southern margin of the Salem Block (the Palghat-Cauvery Shear System, PCSS) in the Southern Granulite Terrane. Investigation of the structural fabrics and the geochronology of the high-grade shear zones within the PCSS system shows that the Moyar-Salem-Attur shear zone to the north of the PCSS system is early Paleoproterozoic in age and associated with dextral strike-slip motion, while the Cauvery shear zone (CSZ) to the south of the PCSS system can be loosely constrained to circa 740-550 Ma and is associated with dip-slip dextral transpression and north side-up motion. To the south of the proposed suture zone (the Cauvery shear zone), the structural fabrics of the Northern Madurai Block suggest four deformational events (D 1 -D 4 ), some of which are likely to be contemporaneous. The timing of high pressure-ultrahigh temperature metamorphism and deformation (D 1 -D 3 ) in the Madurai Block (here interpreted as the southern extension of Azania) is constrained to circa 550-500 Ma and interpreted as representing collisional orogeny and subsequent orogenic collapse of the eastern margin of the East African Orogen. The disparity in the nature of the structural fabrics and the timing of the deformation in the Salem and the Madurai Blocks suggest that the two experienced distinct tectonothermal events prior to their amalgamation along the Cauvery shear zone during the Ediacaran/Cambrian.

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Arabian Shield magmatic cycles and their relationship with Gondwana assembly: Insights from zircon U–Pb and Hf isotopes

Cited by 123 publications

References 40 publications

Zircon Geochemical and Geochronological Constraints on Contaminated and Enriched Mantle Sources beneath the Arabian Shield, Saudi Arabia

Zircon Geochemical and Geochronological Constraints on Contaminated and Enriched Mantle Sources beneath the Arabian Shield, Saudi Arabia

Late Neoproterozoic granulite facies metamorphism in the Menderes Massif, Western Anatolia/Turkey: implication for the assembly of Gondwana

The evolution of a Gondwanan collisional orogen: A structural and geochronological appraisal from the Southern Granulite Terrane, South India

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