The ultrapotassic rocks: Characteristics, classification, and constraints for petrogenetic models

Foley, Stephen F.; Venturelli, G.; Green, David H.; Toscani, Lorenzo

doi:10.1016/0012-8252(87)90001-8

Cited by 739 publications

(439 citation statements)

References 176 publications

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“…Moreover, enclaves and dike samples with the highest MgO (8.50-11.34 wt.%) and Mg # (0.66-0.72) values exhibit high K 2 O/Na 2 O ratios (1.46-2.62) (Appendix 5, Fig. 9c), similar to those of ultrapotassic rocks described by Foley et al (1987). The most obvious differences between the high-SiO 2 acid and low-SiO 2 samples are that their major oxides (e.g., K 2 O and Al 2 O 3 ), trace elements (e.g., Ba) and ratios (e.g., Nb/ Ta) exhibit very distinct trends with increasing SiO 2 contents ( Fig.…”

Section: Major and Trace Elementssupporting

confidence: 58%

Late Early Cretaceous adakitic granitoids and associated magnesian and potassium‐rich mafic enclaves and dikes in the Tunchang–Fengmu area, Hainan Province (South China): Partial melting of lower crust and mantle, and magma hybridization

Wang

Jia

et al. 2012

Chemical Geology

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Section: Major and Trace Elementssupporting

confidence: 58%

Late Early Cretaceous adakitic granitoids and associated magnesian and potassium‐rich mafic enclaves and dikes in the Tunchang–Fengmu area, Hainan Province (South China): Partial melting of lower crust and mantle, and magma hybridization

Wang

Jia

et al. 2012

Chemical Geology

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“…5b) and plot in the field of the shoshonitic series (Fig. 5c, d), which are scarce (Duchesne et al, 1998), but do not have characteristics of ultrapotassic rocks (Foley et al, 1987). Microsyenogranite plots in the high-K field (Fig.…”

Section: Major and Trace Elements And Reementioning

confidence: 95%

Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil

Campos

Neiva

Nardi

2002

Lithos

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The Rio Espinharas pluton, northeastern Brazil, belongs to the shoshonitic series and consists mainly of syenogranite, quartz -monzonite and porphyritic quartz -monzonite, but diorite, quartz -monzodiorite, quartz -syenite and microsyenogranite also occur containing microgranular enclaves, except for the diorite. Most variation diagrams of rocks, amphiboles, biotites and allanites show linear trends, but K, Zr, Sr and Ba of rocks display curved scattered trends. The rocks ranging from diorite to syenogranite define a pseudo-errorchron and have similar REE patterns. Syenogranite and microsyenogranite are derived from two distinct pulses of granite magma with initial 87 Sr/ 86 Sr ratio of 0.7083 F 0.0003 and 0.7104 F 0.0007, respectively. Modelling of major and trace elements shows that the syenogranite evolved by fractional crystallization of plagioclase, microcline, edenite, biotite and titanite, whereas quartz -monzonite, porphyritic quartz -monzonite, quartz -monzodiorite and quartz -syenite resulted from simple mixing between an upper mantle-derived dioritic magma and the upper crust-derived syenogranite magma. Dioritic enclaves are globules of a mafic magma from the upper mantle. D

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“…NARDI et al alogical differences, as recognized by Silva Filho et al (1987), Ferreira and Sial (1993) and Conceição et al (2000b) among other authors. According to Plá Cid et al (2000) the alkaline ultrapotassic association defined by Foley et al (1987) should include the more differentiated intermediate and acid rocks with MgO content under 3 wt.%, and K 2 O/Na 2 O ratios over 2. Additionally, the shoshonitic series corresponds to the latitic or monzonitic series of Tauson (1983) where, as reported by Lameyre and Bowden (1982), monzonites and quartzmonzonites are the typical and characteristic intermediate plutonic rocks.…”

Section: Introductionmentioning

confidence: 99%

“…Lloyd et al 1985, Foley et al 1987. Carmichael et al (1996) described minettes and associated shoshonitic volcanic rocks from Mascota, western Mexico, and proposed that they derive from melting of phlogopite + apatite lherzolites.…”

Section: Introductionmentioning

confidence: 99%

Geochemistry and petrogenesis of post-collisional ultrapotassic syenites and granites from southernmost Brazil: the Piquiri Syenite Massif

Nardi

Plá-Cid

Bitencourt

et al. 2008

An. Acad. Bras. Ciênc.

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The Piquiri Syenite Massif, southernmost Brazil, is part of the post-collisional magmatism related to the Neoproterozoic Brasiliano-Pan-African Orogenic Cycle. The massif is about 12 km in diameter and is composed of syenites, granites, monzonitic rocks and lamprophyres. Diopside-phlogopite, diopside-biotite-augite-calcic-amphibole, are the main ferro-magnesian paragenesis in the syenitic rocks. Syenitic and granitic rocks are co-magmatic and related to an ultrapotassic, silica-saturated magmatism. Their trace element patterns indicate a probable mantle source modified by previous, subduction-related metasomatism. The ultrapotassic granites of this massif were produced by fractional crystallization of syenitic magmas, and may be considered as a particular group of hypersolvus and subsolvus A-type granites. Based upon textural, structural and geochemical data most of the syenitic rocks, particularly the fine-grained types, are considered as crystallized liquids, in spite of the abundance of cumulatic layers, schlieren, and compositional banding. Most of the studied samples are metaluminous, with K 2 O/Na 2 O ratios higher than 2. The ultrapotassic syenitic and lamprophyric rocks in the Piquiri massif are interpreted to have been produced from enriched mantle sources, OIB-type, like most of the post-collisional shoshonitic, sodic alkaline and high-K tholeiitic magmatism in southernmost Brazil. The source of the ultrapotassic and lamprophyric magmas is probably the same veined mantle, with abundant phlogopite + apatite + amphibole that reflects a previous subduction-related metasomatism.

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The ultrapotassic rocks: Characteristics, classification, and constraints for petrogenetic models

Cited by 739 publications

References 176 publications

Late Early Cretaceous adakitic granitoids and associated magnesian and potassium‐rich mafic enclaves and dikes in the Tunchang–Fengmu area, Hainan Province (South China): Partial melting of lower crust and mantle, and magma hybridization

Late Early Cretaceous adakitic granitoids and associated magnesian and potassium‐rich mafic enclaves and dikes in the Tunchang–Fengmu area, Hainan Province (South China): Partial melting of lower crust and mantle, and magma hybridization

Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil

Geochemistry and petrogenesis of post-collisional ultrapotassic syenites and granites from southernmost Brazil: the Piquiri Syenite Massif

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