Sr and O isotope constraints on source and crustal contamination in the high-K calc-alkaline and shoshonitic neogene volcanic rocks of SE Spain

Benito, Rocí­o; López-Ruiz, José; Cebriá, José-María; Hertogen, Jan; Doblas, Miguel; Oyarzún, Roberto; Demaiffe, Daniel

doi:10.1016/s0024-4937(99)00003-1

Cited by 137 publications

(106 citation statements)

References 58 publications

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“…However, other authors (e.g. Zeck 1996;Benito et al 1999;Turner et al 1999) emphasize the post-collisional origin of these rocks. Indeed, formation of most of the 'orogenic' volcanic rocks in the Mediterranean regions postdates the active subduction process and appear to be related to slab break-off, lithospheric mantle delamination or lithospheric extension (e.g.…”

Section: Geodynamic Implicationsmentioning

confidence: 94%

“…7). More widespread calc-alkaline to shoshonitic and ultrapotassic volcanism occurred on the southeast coast of Spain and in Northern Africa from the Early Miocene to Pliocene (Zeck 1970;1998;Nixon et al 1984;Venturelli et al 1984a;Hertogen et al 1985;Di Battistini et al 1987;Louni-Hacini et al 1995, El Bakkali et al 1998Benito et al 1999;Turner et al 1999;Coulon et al 2002;Duggen et al 2004;Gill et al 2004;Fig. 6).…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

“…Fourcade et al (2001) and Coulon et al (2002) also invoked slab break-off to explain the calc-alkaline to alkaline magmatism in Northern Algeria. Other authors (Venturelli et al 1984a;Platt & Vissers 1989;Zeck 1996;Benito et al 1999;Turner et al 1999) argued that the Betic-Alboran volcanism was post-collisional, following Late Cretaceous to Oligocene subduction and Late Oligocene to Early Miocene continental collision. Benito et al (1999), Turner et al (1999) and Coulon et al (2002) suggested that the primary melts were generated in the lithospheric mantle, which had been metasomatised previously by fluids derived from subducted pelagic sediments.…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

“…Zeck (1970;1998) argued for a crustal anatectic origin for the calc-alkaline magmas of southern Spain. Platt & Vissers (1989), Benito et al (1999) and Turner et al (1999) emphasized that melt generation occurred by decompression melting due to extensional collapse of the overthickened orogenic wedge or convective removal of the lithospheric root. In North Africa, El Bakkali et al (1998) also suggested an extension-related origin for the calc-alkaline to potassic magmas of the Eastern Rif (Morocco).…”

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

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Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Harangi

Downes

Seghedi³

2006

Memoirs

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Section: Geodynamic Implicationsmentioning

confidence: 94%

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

Section: Betic-alboran-rif Province (Western Mediterranean)mentioning

confidence: 99%

See 2 more Smart Citations

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Harangi

Downes

Seghedi³

2006

Memoirs

View full text Add to dashboard Cite

“…Alternatively, the melting of subcontinental lithospheric mantle (SCLM) with an inherited subduction signature could also generate these geochemical characteristics (e.g. Turner et al, 1996;Benito et al, 1999). Of the four samples that plot outside the active continental margins field in Fig.…”

Section: Magmatic Parentage and Tectonic Settingmentioning

confidence: 99%

Geochemistry and origin of Carboniferous (Mississippian; Viséan) bentonites in the Namur-Dinant Basin, Belgium: evidence for a Variscan volcanic source

Pointon¹,

Chew²,

Delcambre³

et al. 2018

Geol. Belg.

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ABSTRACT. Several thin clay-rich horizons occur interbedded with Mississippian (Viséan) limestones in the Namur-Dinant Basin, southern Belgium. These have been interpreted as diagenetically altered volcanic ash layers (bentonites). Whole-rock geochemical analysis of several bentonites was undertaken to provide insight into their original magmatic composition. Ratios of several trace elements that are considered to be immobile during diagenetic alteration and indicators of petrogenetic processes suggest that most of the bentonites were originally trachyandesitic to trachytic ashes. Furthermore, the coarse grain size of euhedral zircon phenocrysts (up to 400 µm in length) suggests a proximal volcanic source. Zircon U-Pb isotopic ages and wholerock geochemical data from these bentonites were compared with literature data from volcanic and intrusive rocks in adjacent areas, and suggest that the bentonites were sourced from volcanoes within the Variscan orogenic belt.KEYWORDS: altered volcanic ash, cinerite, whole-rock geochemistry, trace element geochemistry, X-ray diffraction analysis.http://dx

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Removal of deep lithosphere in ancient continental collisional orogens: A case study from central Tibet, China

Chen

Shi

et al. 2017

Geochem Geophys Geosyst

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Widespread but small‐volume Late Cretaceous volcanic rocks in central Tibet contain important information on the Lhasa‐Qiangtang collision process. In this contribution, we focus on Late Cretaceous volcanics in the southern Qiangtang subterrane and present zircon LA‐ICP‐MS U‐Pb ages, whole‐rock major and trace element compositions, and Sr‐Nd isotopic data. Zircon LA‐ICP‐MS U‐Pb dating yielded a concordant age of 80 Ma, which postdates the Early Cretaceous collision of the Qiangtang and Lhasa terranes. The volcanic rocks are potassium‐rich alkaline andesites with high contents of K2O (3.45–5.11 wt %) and Th (13.39–25.02 ppm), as well as high K2O/Na2O ratios (0.6–0.9). They have higher REE and HFSE contents than coeval Mg‐rich and adakite‐like magmatic rocks that can be related to partial melting of a thickened lower crust. Moreover, they have higher values of Mg# and lower contents of SiO2 than lower continental crust‐derived rocks in central Tibet and experimental data of mafic rocks. We argue that the andesites were generated after the removal of thickened lithospheric mantle and subsequent to the final Lhasa‐Qiangtang amalgamation in a postcollisional setting. The high‐K characteristics can be explained by producing the primitive andesite magmas from partial melting of the residual and shallow metasomatized lithospheric mantle (the K‐rich layer) during heating by upwelling asthenosphere; subsequently, these primitive andesite magmas were subjected to fractional crystallization to generate the Amdo andesites. The way in which these andesites were formed provides evidence for the lithospheric thickening and uplifting of central Tibet during the Late Cretaceous prior to India‐Asia collision.

show abstract

Sr and O isotope constraints on source and crustal contamination in the high-K calc-alkaline and shoshonitic neogene volcanic rocks of SE Spain

Cited by 137 publications

References 58 publications

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Tertiary-Quaternary subduction processes and related magmatism in the Alpine-Mediterranean region

Geochemistry and origin of Carboniferous (Mississippian; Viséan) bentonites in the Namur-Dinant Basin, Belgium: evidence for a Variscan volcanic source

Removal of deep lithosphere in ancient continental collisional orogens: A case study from central Tibet, China

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