Mantle derivation of Archean amphibole-bearing granitoid and associated mafic rocks: evidence from the southern Superior Province, Canada

Sutcliffe, R. H.; Smith, Alan Р.; Doherty, William O.S.; Barnett, Robert L.

doi:10.1007/bf00306538

Cited by 97 publications

(23 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This type of granodioritic enclaves is comparable to other mafic enclaves in granites (Cantagrel et al, 1984;1990;Blundy and Sparks, 1992). These geochemical features demonstrate the mantle contribution to the granitic magma evolution during early stages of extension (Feeley and Grunder, 1991;Sutcliffe et al, 1990). It is reasonable to infer that the granodioritic enclaves are an earlier intrusive phase, and the host megacryst monzogranite is evolved from the same source magmas which are associated with basaltic magmas from upper mantle.…”

Section: -4-3 Relation Between the Megacryst Monzogranite And Granosupporting

confidence: 59%

Geochimie et mineralogie des granites de la region de Hetai province de Guangdong Chine meridionale =

Yang¹

1993

View full text Add to dashboard Cite

The Hetai Area, located in the western Guangdong Province of South China, has been affected by four orogenies, from the Caledonian (Early Paleozoic) to the Yanshanian (Late Mesozoic). Two major northeast trending faults, the Guangning-Loudin and the Wuchuan-Sihui, characterized by wide deformation zones, traverse the region. Granitic rocks, which cover about half the surface area, are related to each of the four orogenies. Previous regional studies have been premised on the importance of in situ granitization of Precambrian strata for the formation of the older granitic rocks as well as the formation of the Hetai gold deposits.This study discusses the genesis and evolution of ten granitic intrusions from the Hetai area based on their petrography, mineralogy and geochemistry. The granites of the Hetai Area are defined as "older granites" (Caledonian and Hercynian granites) and "younger granites" (Indosinian and Yanshanian granites) for comparison. Detailed field and microscopic observations show that all granitic rocks have a magmatic flow foliation. This foliation is overprinted by various degrees of solid-state deformation in the older (Caledonian and Hercynian) granite bodies.The geochemical analyses of granites also distinguish them into different types. The older granites are characterized mainly by peraluminous chemistry (A/CNK>1.05), high LILE/HFSE, HREE/LREE and a negative Eu anomaly, whereas the younger granites are characterized by slightly peraluminous and metaluminous chemistry (A/CNK<1.05), a significant change of LILE/HFSE, HREE/LREE and a negative Eu anomaly ranging from low to high with the calc-alkaline -> alkaline evolution of the magma. Comparison of the granites of the Hetai Area to those of well studied world areas by selected geochemical diagrams such as (Nb+Ta) vs (V+Sc) and Rb/Sr shows that the older granites are similar to S-type granite, but the younger granites are coincident with I-type and A-type (?) granites.Au contents are higher in younger granites than those in older granites. Au distributions in different type granites of the Hetai Area suggest that the granites derived Chemical analyses of biotite show that biotites from the older granites contain high FeO (>22%) and A1 2 C>3(>15%) but low MgO (<8%), TiO 2 (<3%) and SiO 2 (<36%), whereas those from the younger granites have high MgO (>8%), TiO 2 (>3%) and SiO 2 (>36%) but low FeO (<22%) and A1 2 O3 (<15%). In general, the biotites from older evolution of the different granites shows a geotectonic evolution from the peraluminous collision-type granites to mafic and calc-alkaline subduction-type granites finally to alkaline extension-type granites in the Hetai Area. IV RESUMECette thèse porte sur la genèse et l'évolution des roches granitiques de la région de Hetai et sur leurs relations possibles avec la minéralisation aurifère. Cette région de la Chine Méridionale est située à l'ouest de la Province de Guangdong. La Chine Méridionale a une histoire géotectonique complexe et l'étude des granites de la région de Hetai, qui...

show abstract

Section: -4-3 Relation Between the Megacryst Monzogranite And Granosupporting

confidence: 59%

Geochimie et mineralogie des granites de la region de Hetai province de Guangdong Chine meridionale =

Yang¹

1993

View full text Add to dashboard Cite

show abstract

“…Many K-rich GGM suites are younger than 2.65 Ga, and record a distinct change in the tectonic-thermal regime of the crust. Examples include Wyoming Craton in North America (Frost et al, 1998), Dharwar Craton in India (Moyen et al, 2003) and southern superior Province in Canada (Sutcliffe et al, 1990). K-rich GGM suites elsewhere in the world are thus considered to be able to provide constraints for the geodynamic processes of the Precambrian continental crust.…”

Section: Introductionmentioning

confidence: 99%

Geochronology and geochemistry of 2.5 to 2.4Ga granitic plutons from the southern margin of the North China Craton: Implications for a tectonic transition from arc to post-collisional setting

et al. 2011

View full text Add to dashboard Cite

“…In addition, partial melting of any of the older crustal rocks in the deep crust would have produced high-Si, granitoid melts, which is not the case for the geochemically intermediate Turner Mountain syenite. The third model involves partial melting of metasomatized mantle (Sutcliffe et al 1990;Lynch et al 1993) or residual melts formed by differentiation of alkali basalt magma (e.g., Parker 1983;Thorpe and Tindle 1992). The "partial melting of metasomatized mantle" model was adopted by West et al (2007) to address the petrogenesis of the Lincoln syenite.…”

Section: Comparison With Other Plutons In the Regionmentioning

confidence: 99%

The Turner Mountain syenite, Maine, USA: geology, geochemistry, geochronology, petrogenesis, and post-orogenic exhumation

Wang

Ludman

Xiao

2014

atgeol

View full text Add to dashboard Cite

The Turner Mountain syenite is one of the few plutons located entirely within the Norumbega fault system in the northern Appalachian orogen. It is composed of texturally and mineralogically homogeneous biotite-amphibole syenite and is in faulted contact with mylonitic leucogranite and an unmetamorphosed redbed unit. It is intermediate in SiO 2 content (58.7-65.1 wt%) and ultrapotassic (6.4-7.9 wt% K 2 O) with high K 2 O/Na 2 O ratios (2.75-4.15), yet is relatively primitive in terms of MgO (2.8-4.9 wt%), Ni (average 90.2 ppm), and Cr (average 210.1 ppm) contents. It has enriched large-ion-lithophile elements relative to high field strength elements, high contents of light rare-earth elements, and initial 87 Sr/ 86 Sr ratios (0.7038-0.7068) similar to that of OIB basalts. It differs petrologically and geochemically from the neighboring Lucerne-Deblois plutons but is similar to Lincoln syenite located 100 km to the southwest, also within the Norumbega system. Zircon U-Pb dating using LA-ICP-MS yields a weighted mean age of 410.5 ± 2.4 Ma, slightly younger than the Lincoln syenite (418 ± 1 Ma). Based on their distinctive geochemical signatures, both were probably products of Late Silurian-Early Devonian ultrapotassic magmatism related to Acadian subduction, generated by partial melting of a mantle wedge metasomatized by potassium-rich fluids during west-directed subduction. This unique magmatism could be attributed to decompressional melting during Late Silurian-Early Devonian slab break-off or delamination. Based on Sr-Nd isotopic compositions, the Turner Mountain syenite magma probably had more crustal interaction than that which formed the Lincoln syenite. The syenite was later exhumed tectonically during brittle reactivation of the Norumbega fault. The reactivation involved regional-scale, high-angle, southeastover-northwest reverse faulting in a transpressional environment and occurred during the Late Devonian and through Mississippian to Permian. RÉSUMÉLa syénite du mont Turner est l'un des rares plutons qui se trouvent entièrement dans le système de failles de Norumbega, situé dans la partie nord de l' orogène des Appalaches. Composée de syénite à biotite et à amphibole homogène du point de vue de la texture et de la minéralogie, cette roche est en contact faillé avec le leucogranite mylonitique et une unité de couches rouges non métamorphisée. Elle a une teneur en SiO 2 (58,7-65,1 % en poids) et une composition ultrapotassique (6,4-7,9 % en poids K 2 O) intermédiaires et son rapport K 2 O/Na 2 O est élevé (2,75-4,15), mais elle reste tout de même plus ou moins primitive pour ce qui est de la teneur en MgO (2,8-4,9 % en poids), Ni (en moyenne 90,2 ppm) et Cr (en moyenne 210,1 ppm). La syénite possède des éléments lithophiles à grand rayon ionique enrichis comparativement aux éléments à forte liaison atomique, des éléments à haute teneur en terres rares légères et des rapports initiaux de 87 Sr/ 86 Sr (0,7038-0,7068) similaires aux basaltes d'îles océaniques. Elle diffère donc, sur les plans pétr...

show abstract

Mantle derivation of Archean amphibole-bearing granitoid and associated mafic rocks: evidence from the southern Superior Province, Canada

Cited by 97 publications

References 46 publications

Geochimie et mineralogie des granites de la region de Hetai province de Guangdong Chine meridionale =

Geochimie et mineralogie des granites de la region de Hetai province de Guangdong Chine meridionale =

Geochronology and geochemistry of 2.5 to 2.4Ga granitic plutons from the southern margin of the North China Craton: Implications for a tectonic transition from arc to post-collisional setting

The Turner Mountain syenite, Maine, USA: geology, geochemistry, geochronology, petrogenesis, and post-orogenic exhumation

Contact Info

Product

Resources

About