REE geochemistry and isotopic data of Archean silicic volcanics and granitoids from the Pilbara Block, Western Australia: implications for the early crustal evolution

Jahn, Bor‐ming; Glikson, Andrew Y.; Peucat, Jean-Jacques; Hickman, Arthur H.

doi:10.1016/s0016-7037(81)80002-6

Cited by 369 publications

(111 citation statements)

References 37 publications

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“…6B, E). Several samples (Table 3) show characteristic Sr/Y ratios N 20 together with an enrichment of Y; the Y and Yb enrichment is classified as being of normal arc type, starting with an amphibole fractionation (Jahn et al, 1981) and a plagioclase fraction (Fig. 6F, G).…”

Section: Magma Evolutionmentioning

confidence: 99%

Geochronology, geochemistry and isotope tracing of the Oligocene magmatism of the Buchim–Damjan–Borov Dol ore district: Implications for timing, duration and source of the magmatism

Lehmann

Barcikowski

Quadt

et al. 2013

Lithos

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This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues.Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. show that the magmatic products were slightly contaminated by continental crust material, e.g., the Variscan/Cadomian basement. In the Late EoceneOligocene belt the magmatism between 29 and 35 Ma is dominated by crustal melting with an increase in the mantle contribution between 20 and 27 Ma. We suggest the following scenario for the magmatic history of the Buchim-Damjan-Borov Dol ore district: a slab rollback of an oceanic slab located further to the SW which led to extensional and compressional features in upper levels of the continental crust. In the middle to upper crust three consecutive crystallization stages occurred at variable depths as indicated by amphibole zonation. Mixing of newly formed crust with mantle-like affinities and continental crust material in variable degrees during the ascent of the magma can explain all geochemical characteristics. The magma crystallized as dykes or stocks near the Earth's surface (N 1 km) after its final emplacement and contemporaneous hydrothermal activity led to different mineralization styles depending on the lithology of the host rocks.

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Section: Magma Evolutionmentioning

confidence: 99%

Geochronology, geochemistry and isotope tracing of the Oligocene magmatism of the Buchim–Damjan–Borov Dol ore district: Implications for timing, duration and source of the magmatism

Lehmann

Barcikowski

Quadt

et al. 2013

Lithos

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“…It requires more single zircon dates to confirm this. The Archaean TTG suites from the shield, as well as from other Archaean terranes are not direct mantle products (Jahn et al 1981) and are most likely derived by partial melting of basaltic sources.…”

Section: Figure 4 -Rare Earth Element Distribution In the Archaean Gnmentioning

confidence: 99%

Granite Forming Events and Their Role in Crust Formation of the Indian Shield

Rao

SUBBARAO

Murthy

1999

RBG

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Continental crustal evolution in the Indian shield appears to have started around the middle Archaean and completed by the early Proterozoic. In this time span of around 700 -800 Ma, the primordial gneissic crust has evolved, recycled and stabilized. The earliest phase of the granitoid activity, from the middle-to late Archaean consists predominantly of a tonalite-trondhjemite-granodiorite (TTG) suite, while the second phase of the Archaean -Proterozoic transition (APT) period consists predominantly of granodiorite-adamellite suite. Minor granite forming events have occurred in the middle-to late Proterozoic. The compositional changes in the granites from the Archaean to the Proterozoic appear to have been mainly controlled by the tectonics and the source compositions at each stage and contribution from the mantle appears to be negligible. Increasing of some large ion lithophile (LIL) elements and decreasing of compatible trace elements in the APT granites compared to the earlier gneissic phase and the overall compositions of the latter (the gneisses) suggest that the middle-to late Archaean polyphase gneisses are the partial melts of the mafic rocks from greenstones and the various phases of the tonalite-trondhjemite-granodiorite (TTG), viz., the hornblende-biotite-and feldspathic gneisses (younging in the same order) are the successive fractionate of similar or same source. The tectonic setting at the time of formation of the TTG gneisses is more of a compressive regime and crustal thickening appears to have played a role in the initiation of partial melting of the source. The appearance of extensive K-rich batholithic granites throughout the shield in a limited time span of 200-300 Ma during the early Proterozoic, increase of LIL elements and high Th, Rb and Sr variations in these batholithic granites suggest that these granites are anatectic in nature and have formed due to the release of compressional forces and initiation of an extensional regime in the shield area. Though sporadic important alkalic granite bodies have formed in the middle to late Proterozoic, they are mostly restricted to the orogenic belts like the Aravalli, the Delhi, the Satpura and the Eastern Ghats. Many of these post-tectonic granites (mostly A-type) give evidence for crust-mantle interaction in their formation and their emplacement in a stable continental crust setting.

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“…The Archean continental crust is largely made up of granitoid gneisses, dominantly TTG series (Jahn et al, 1981;Moyen & Martin, 2012) with subordinate Archaean sanukitoids (Shirey & Hanson, 1984;Martin et al, 2005) and minor biotite and two-mica granites (Laurent et al, 2014). Considering the close geochemical similarities between the TTG suites and modern adakites, and between Archaean sanukitoids and modern HMAs, Archean granitoids are widely used as a geodynamic indicator of the onset of 'modern-style' plate tectonics (Martin, 1999;Martin et al, 2005;Laurent et al, 2014).…”

Section: Formation Of Archean Continental Crustmentioning

confidence: 99%

Coexisting Early Cretaceous High-Mg Andesites and Adakitic Rocks in the North China Craton: the Role of Water in Intraplate Magmatism and Cratonic Destruction

Zheng

et al. 2016

J. Petrology

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High-Mg andesites (HMAs) and adakitic rocks are purported to occur exclusively in subduction zones in the modern Earth. In the North China Craton, early Cretaceous HMAs and adakitic dacites were erupted in a continental setting, apparently unrelated to subduction given their location distal (>1000 km) to the trench at that time. Here we report petrological, mineralogical and geochemical data for these rocks with the aim of constraining their petrogenesis and elucidating the role of water in intraplate magmatism and cratonic destruction. The HMAs can be subdivided into olivine (Ol-)HMAs and clinopyroxene (Cpx-)HMAs. The former have high MgO (>9Á8 wt %) and Mg# (>71), with rare high-Fo (up to 91) olivine phenocrysts, corresponding to (near-)primary magmas that equilibrated with mantle peridotite. The latter have moderate MgO (7Á8-8Á8 wt %) and Mg# (mostly <70) and low-Fo (mostly < 83) olivine phenocrysts. The Cpx-HMAs are interpreted as magmas differentiated from the Ol-HMAs by olivine-dominated fractionation at lower-crust levels. P-T-X H2O estimations show that the primary HMAs are melts of shallow (1Á1-1Á2 GPa), hot ($1250 C) and wet (H 2 O > 3 wt %) lithospheric mantle. The coexisting adakitic dacites are hydrous (H 2 O ! 5 wt %) magmas with high SiO 2 (>63 wt %), Sr/Y ratios (!39) and Yb SN (source-normalized), low (Sm/Yb) SN , and negligible Eu anomalies. They also have unradiogenic whole-rock Nd [e Nd (t) ¼ -19 to -9] and zircon Hf [e Hf (t) ¼ -23 to -21] isotopic compositions consistent with derivation by melting of ancient lower crust at depths < 40 km. Melting may have been induced by heating and addition of H 2 O from underplated HMAs. Mixing between Cpx-HMAs and low-Mg adakitic dacites in magma chambers produced high-Mg adakitic rocks. The petrogenetic model presented here explains the occurrence of intraplate HMAs and adakitic magmas elsewhere in the North China Craton. The P-T-X H2O conditions inferred for HMA generation imply that the subcontinental lithospheric mantle beneath the craton was hot and hydrous in the early Cretaceous, which may have triggered the destruction of the cratonic root. The occurrence of young HMAs and adakitic rocks in an intraplate extensional environment also casts doubts on the common use of a similar igneous rock association as an indicator of subduction processes in Archean time.

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REE geochemistry and isotopic data of Archean silicic volcanics and granitoids from the Pilbara Block, Western Australia: implications for the early crustal evolution

Cited by 369 publications

References 37 publications

Geochronology, geochemistry and isotope tracing of the Oligocene magmatism of the Buchim–Damjan–Borov Dol ore district: Implications for timing, duration and source of the magmatism

Geochronology, geochemistry and isotope tracing of the Oligocene magmatism of the Buchim–Damjan–Borov Dol ore district: Implications for timing, duration and source of the magmatism

Granite Forming Events and Their Role in Crust Formation of the Indian Shield

Coexisting Early Cretaceous High-Mg Andesites and Adakitic Rocks in the North China Craton: the Role of Water in Intraplate Magmatism and Cratonic Destruction

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