Magmatism in Extensional Structural Settings

Kampunzu, A.B.; Lubala, R. T.

doi:10.1007/978-3-642-73966-8

Cited by 30 publications

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References 500 publications

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“…Constraining the dynamics of magma flow behavior, subvolcanic deformation, and the processes that control the evolution of the volcanic construct is important tasks in volcanology. Volcanic activity is very common within intracontinental rift systems such as the Rio Grande Rift (e.g., Chapin 1979;Perry et al, 1987;Ricketts et al, 2016), East African Rift System (e.g., Abebe et al, 2007;Kampunzu & Lubala, 1991;Rapprich et al, 2016), and the European Cenozoic Rift System (e.g., Babuška & Plomerová, 2010;Dèzes et al, 2004; Volcanic Field, Czech Republic. These data allowed us to decipher the outer tuff cone morphology, the magma plumbing system geometry, and subvolcanic deformation progression.…”

Section: Introductionmentioning

confidence: 99%

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and ⁴⁰Ar/³⁹Ar Geochronology Data

Petronis

Valenta

Rapprich

et al. 2018

Geochem Geophys Geosyst

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The Zebín Volcano, Czech Republic, is a quarried tuff cone that offers the opportunity to understand emplacement processes responsible for magma transport through a pyroclastic cone and magmatic processes involved in its development. A high‐resolution ground magnetometry survey, electrical resistivity tomography, and refraction seismic were conducted to supplement field mapping of the size, shape, and inner structure of the volcanic system. The Zebín Volcano yields normal polarity rocks, and the cone is underlain by a complex and branching magma feeder system with several diverging dikes. Samples were collected at 24 sites from feeder dikes and the main conduit for anisotropy of magnetic susceptibility and paleomagnetic analysis. Anisotropy of magnetic susceptibility results yield inferred magma flow directions indicating subhorizontal magma flow toward and away from the axial conduit as well as both upward and downward flow. Paleomagnetic data from all sites are normal polarity with statistically distinct remanence directions between some sites that indicate that significant time passed or deformation occurred during the growth of this volcanic system. 40Ar/39Ar isochron ages of groundmass provide emplacement ages of 18.38 ± 0.03 and 18.45 ± 0.03 Ma, whereas a weighted mean date of 18.52 ± 0.03 Ma for hornblende provides an eruption age. We argue that the Zebín Volcano evolved from a polyphase feeding system and through a complex feeder network. This detailed study shows that many monogenetic volcanoes deserve highly detailed study, as their subtleties can provide insight into broader crustal and magmatic environment during magmatism.

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Section: Introductionmentioning

confidence: 99%

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and ⁴⁰Ar/³⁹Ar Geochronology Data

Petronis

Valenta

Rapprich

et al. 2018

Geochem Geophys Geosyst

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Occurrence and geochemistry of metamafic rocks from the Forquilha Eclogite Zone, central Ceará (NE Brazil): geodynamic implications

2011

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In the northern region of the Borborema Province, a 30 km-long mafic/ultramafic belt of high pressure (HP) rocks called the Forquilha Eclogite Zone has been recently discovered in the Central Domain of Ceará State. The belt comprises three groups of rocks: (1) garnet amphibolites, (2) retrograded eclogites and (3) clinopyroxene-garnet amphibolites, all of them being hosted in garnet AE kyanite þ sillimanite schists and orthogneisses which are often migmatized. The geochemical analyses of 30 representative samples confirm differences among the three groups that were initially classified by petrography. The garnet amphibolites are the most depleted rocks, with relatively flat rare earth element (REE) PM pattern and (SPIDER) PM pattern with negative Rb, Th, Nb, Sr and Zr anomalies. It is the most fractionated group, ranging from picrobasalts to andesites. Fractional crystallization and mineral accumulation are indicated by Eu and Sr anomalies. The data show geochemical affinities with island-arc basalts. The retrograded eclogites display flat (REE) PM , but without Eu anomalies. Nb/La ratios are low and variable, as for slightly enriched MORB from ocean floor or intra-oceanic back-arc environments. However, a genetic link with the Group 1 rocks cannot be completely discarded. The clinopyroxene-garnet amphibolites are the most enriched group. (REE) PM and (SPIDER) PM patterns show many features of alkaline basalts. In the Nb/Yb versus Th/Yb diagram the data cluster near the E-MORB standard. Several geochemical aspects of these rocks fit well those from the HP/UHP Pan-African/Brasiliano Suture Zone in the Dahomeyides/Hoggar regions of West Africa. However, differences in their extent and lack of alignment preclude a direct correlation among these zones.

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Intrusion-Related Hydrothermal Mineral Systems

Pirajno

2009

Hydrothermal Processes and Mineral Systems

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Magmatism in Extensional Structural Settings

Cited by 30 publications

References 500 publications

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and ⁴⁰Ar/³⁹Ar Geochronology Data

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and ⁴⁰Ar/³⁹Ar Geochronology Data

Occurrence and geochemistry of metamafic rocks from the Forquilha Eclogite Zone, central Ceará (NE Brazil): geodynamic implications

Intrusion-Related Hydrothermal Mineral Systems

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Magmatism in Extensional Structural Settings

Cited by 30 publications

References 500 publications

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and 40Ar/39Ar Geochronology Data

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and 40Ar/39Ar Geochronology Data

Occurrence and geochemistry of metamafic rocks from the Forquilha Eclogite Zone, central Ceará (NE Brazil): geodynamic implications

Intrusion-Related Hydrothermal Mineral Systems

Contact Info

Product

Resources

About

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and ⁴⁰Ar/³⁹Ar Geochronology Data

Emplacement History of the Miocene Zebín Tuff Cone (Czech Republic) Revealed From Ground Geophysics, Anisotropy of Magnetic Susceptibility, Paleomagnetic, and ⁴⁰Ar/³⁹Ar Geochronology Data