Geochemistry of the Gabbro--Diorite--Tonalite--Trondhjemite Suite of southwest Finland and its Implications for the Origin of Tonalitic and Trondhjemitic Magmas

Arth, Joseph G.; Barker, Fred G.; Peterman, Zell E.; Friedman, Irving

doi:10.1093/petrology/19.2.289

Cited by 235 publications

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“…On primitive mantle-normalized spider plots for trace elements, all the intermediate-felsic rocks show similar patterns, with negative anomalies in Nb, Th and Ti (Díez-Montes and Bellido-Mulas 2008). As a group, they define a low-Al TTG and high-HREE series (Arth et al 1978), broadly equivalent to the FII dacite-rhyolite group of Lesher et al (1986), Hart et al (2004). These series are commonly related to massive sulphide deposits.…”

Section: Geochemistry Of Volcanic Rocksmentioning

confidence: 99%

Introduction and Geological Setting of the Iberian Pyrite Belt

Inverno

Montes

Rosa

et al. 2015

Mineral Resource Reviews

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The 250 × 20-70 km Iberian Pyrite Belt (IPB) is a Variscan metallogenic province in SW Portugal and Spain hosting the largest concentration of massive sulphide deposits worldwide. The lowermost stratigraphic unit is the early Givetian to late Famennian-Strunian (base unknown) PhylliteQuartzite Group (PQG), with shales, quartz-sandstones, quartzwacke siltstones, minor conglomerate and limestones at the top. The PQG is overlain by the Volcanic Sedimentary Complex (VSC), of late Famennian to mid-late Visean age, with a lower part of mafic volcanic rocks, rhyolites, dacites and dark shales, hosting VHMS deposits on top (many times capped by a jasper/chert layer), and an upper part, with dark, purple and other shales and volcanogenic/volcaniclastic rocks, carrying Mn oxide deposits. The VSC is covered by the thousands of meters thick Baixo Alentejo Flysch Group of late Visean to Moscovian age. The VSC

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Section: Geochemistry Of Volcanic Rocksmentioning

confidence: 99%

Introduction and Geological Setting of the Iberian Pyrite Belt

Inverno

Montes

Rosa

et al. 2015

Mineral Resource Reviews

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“…The negative Eu anomalies present in the majority of these gneisses, indicate the role of hornblende, plagioclase in the source rock. Also partial melting of mafic source can give rise to both plagioclaserich and plagioclase-poor rocks, depending on the degree of partial melting (Arth et al 1978).…”

Section: Composition Of the Archaean Crustmentioning

confidence: 99%

“…Genesis of the TTG suite is significant to early continental development and the relevant genetic hypothesis broadly fall under four categories (a) partial melting of eclogitic or mafic garnet granulite source composition (O'Nions & Pankhurst 1974, Condie & Hunter 1976, Compston 1978, Glikson 1979, (b) partial melting of amphibolite (Barker & Arth 1976, Hunter et al 1976; (c) fractional crystallization of basaltic magma (Arth et al 1978) and d) high degrees of remelting of earlier sialic crust of suitable composition. The (La/Yb) n , REE profiles of the many of the Indian gneisses (Bhaskar suggest their formation from a source of basaltic composition in the form of amphibolite.…”

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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“…In the ternary diagram of normative Qz -Or -Ab (Arth et al, 1978) all plots fall in between 5 to 7 kb of pressure ( Figure 19). It is inferred that these granitic rocks are formed at 5 to 7 kb PH 2 O and at 650 o C to 700 o C temperature.…”

Section: Temperature and Pressure Conditionsmentioning

confidence: 99%

“…The low melting components of pelitic gneisses and other rocks of suitable composition may have led to the formation of granites. (after Yoder et al, 1967) Figure 19: Qz-Ab-Or ternary diagrams (after Arth et al, 1978) …”

Section: Temperature and Pressure Conditionsmentioning

confidence: 99%

Petrogenesis and Tectonic Environment of Granites, Eastern Ghats, South India- A Case Study

Brahmaiah

Karunakar

Krishna

et al. 2017

IJAESE

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This study presents the geochemical characteristics of granitic rocks located a part of the Eastern Ghats which lies to the east of Cuddapah basin (Obachettapalem in Prakasam district, A.P). These granites are typically uniform as is evident from the chemical and modal classification. The field, petrographic and petrochemical studies explain the magmatic nature of the granites. The magma of these granites is peraluminous and calc-alkaline nature and emplaced as syn-collision environment and crystallised at 650 o C to 700 o C at 5 to 7 kb of PH 2 O.

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Geochemistry of the Gabbro--Diorite--Tonalite--Trondhjemite Suite of southwest Finland and its Implications for the Origin of Tonalitic and Trondhjemitic Magmas

Cited by 235 publications

References 0 publications

Introduction and Geological Setting of the Iberian Pyrite Belt

Introduction and Geological Setting of the Iberian Pyrite Belt

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

Petrogenesis and Tectonic Environment of Granites, Eastern Ghats, South India- A Case Study

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