H-type (hybrid) granitoids: a proposed revision of the granite-type classification and nomenclature

Castro, Antonio; Moreno‐Ventas, I.; Rosa, J. de la

doi:10.1016/0012-8252(91)90020-g

Cited by 155 publications

(69 citation statements)

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“…Magma mixing is an accepted mechanism for the origin of microgranular enclaves (e.g., Frost and Mahood, 1987;Poli and Tommasini, 1991;Castro et al, 1991;Zorpi et al, 1991;Barbarin and Didier, 1992;Erlburg, 1996;D'Lemos, 1996;Maas et al, 1997;Collins et al, 2000;Silva et al, 2000;Waight et al, 2001) and for the origin of large intrusions (e.g., Neves and Vauchez, 1995;Collins, 1998;Barnes et al, 2001). This process ranges from magma mingling when original components maintain most of their characteristics, through partial mixing with the production of a heterogeneous hybrid magma to complete and homogeneous mixing (D'Lemos, 1996).…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil

Campos

Neiva

Nardi

2002

Lithos

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“…The REE as well as trace element patterns of basic gabbros are consistent with those of acidic granitic rocks. These are characteristics of magma mixing [46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61] . The banding of concentrated minerals indicates that two kinds of magma did not completely crystallize when the magma mixing took place.…”

Section: Discussionmentioning

confidence: 99%

The Early Jurassic magmatism in northern Guangdong Province, southeastern China: Constraints from SHRIMP zircon U-Pb dating of Xialan complex

et al. 2009

Sci. China Ser. D-Earth Sci.

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This paper reports SHRIMP zircon U-Pb ages of 196±2 Ma for granite, and 195±1 Ma for gabbro from theXialan complex in the Meizhou area, northern Guangdong Province. These results shed new light on the calm stage of magmatic activity in southeastern China during 200-180 Ma, and revealed that the back-arc extension induced by the subduction of the western Pacific plate may have begun at 195 Ma at least. Field observation on the fresh outcrops allows us to recognize some features formed by magma mixing. A part of the gabbro has a fine-grained rim of 20-30 cm at the margin, and thins gradually toward the granite; numerous dark fine-grained to microcrystalline dioritic enclaves developed in the granite. These enclaves vary in shape and size, dark minerals concentrated at the margin of enclaves, and the contact between enclaves and host rock is either obvious or obscure, or gradational. In addition, needle-shaped apatites are included in the enclaves. The REE patterns of gabbros, as well as the trace element patterns, are generally consistent with those of granitic rocks. The above characters further suggest that in the Early Jurassic the injection of basic magma had melted deep continental crust and produced acidic magma, and the Xialan complex was produced by the mixing of them.

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“…22), yelding magma assimilation and hybrid magmas (Castro et al, 1991). The residual denser mafic magma sinks to the bottom of the magma chamber with evidence of sedimentary-like structures (Wiebe and Collins, 1998).…”

Section: Enclavesmentioning

confidence: 98%

Textures and melt-crystal-gas interactions in granites

Vigneresse¹

2015

Geoscience Frontiers

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a b s t r a c tFelsic intrusions present ubiquitous structures. They result from the differential interactions between the magma components (crystal, melt, gas phase) while it flows or when the flow is perturbed by a new magma injection. The most obvious structure consists in fabrics caused by the interactions of rotating grains in a flowing viscous melt. New magma inputs through dikes affect the buk massif flow, considered as global within each mineral facies. A review of the deformation and flow types developing in a magma chamber identifis the patterns that could be expected. It determines their controlling parameters and summarizes the tools for their quantification. Similarly, a brief review of the rheology of a complex multiphase magma identifies and suggests interactions between the different components. The specific responses each component presents lead to instability development. In particular, the change in vorticity orientation, associated with the switch between monoclinic to triclinic flow is a cause of many instabilities. Those are preferentially local. Illustrations include fabric development, shear zones and flow banding. They depend of the underlying rheology of interacting magmas. Dikes, enclaves, schlieren and ladder dikes result from the interactions between the magma components and changing boundary conditions. Orbicules, pegmatites, unidirectional solidification textures and miarolitic cavities result from the interaction of the melt with a gaseous phase. The illustrations examine what is relevant to the bulk flow, local structures or boundary conditions. In each case a field observation illustrates the instability. The discussion reformulates instability observations, suggesting new trails for ther description and interpretation in terms of local departure to a bulk flow. A brief look at larger structures and at their evolution tries to relate these instabilities on a broader scale. The helical structures of the Rí cany pluton, Czech Republic and by the multiple granitic intrusions of Dolbel, Niger illustrate such events.Ó 2014, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).

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H-type (hybrid) granitoids: a proposed revision of the granite-type classification and nomenclature

Cited by 155 publications

References 25 publications

Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil

Geochemistry of the Rio Espinharas hybrid complex, northeastern Brazil

The Early Jurassic magmatism in northern Guangdong Province, southeastern China: Constraints from SHRIMP zircon U-Pb dating of Xialan complex

Textures and melt-crystal-gas interactions in granites

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