Upper and lower crust recycling in the source of CAMP basaltic dykes from southeastern North America

Callegaro, Sara; Marzoli, Andréa; Bertrand, Hervé; Chiaradia, Massimo; Reisberg, Laurie; Meyzen, Christine; Bellieni, G.; Weems, Robert E.; Merle, Renaud

doi:10.1016/j.epsl.2013.06.023

Cited by 70 publications

(112 citation statements)

References 91 publications

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“…4). This crustal fingerprint, evidenced also by Sr-Nd-Pb-Os isotope ratios, is best interpreted as deriving from recycling of subducted continental rocks in the shallow mantle rather than from crustal contamination of basaltic magmas (e.g., Callegaro et al, 2013;Merle et al, 2014). This latter hypothesis is consistent with evidence that mantle metasomatized by slab-derived fluids contains higher sulfur compared to depleted or primitive mantle (Jego and Dasgupta, 2013).…”

Section: Why Do Different Lips Yield Different Sulfur Burdens?supporting

confidence: 69%

Microanalyses link sulfur from large igneous provinces and Mesozoic mass extinctions

Callegaro

Baker

Min

et al. 2014

Geology

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Volcanic gases can have devastating impacts on Earth’s environment and life. However, measurement of volatile elements in prehistoric magmas is challenging. We present a new method for determining sulfur contents in magmas using its concentrations in clinopyroxenes and an experimentally determined crystal-melt partition coefficient. Using this method we compared magmatic sulfur contents in the Paraná-Etendeka large igneous province (LIP; South America) and two other similarly sized LIPs, the Central Atlantic magmatic province (CAMP) and the Deccan Traps (India). We found that the CAMP and Deccan Traps, both associated with major extinction events, contained high magmatic sulfur concentrations, up to 1900 ppm. Conversely, the Paraná-Etendeka LIP, lacking significant environmental effects, had substantially lower magmatic sulfur concentrations, less than 800 ppm

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Section: Why Do Different Lips Yield Different Sulfur Burdens?supporting

confidence: 69%

Microanalyses link sulfur from large igneous provinces and Mesozoic mass extinctions

Callegaro

Baker

Min

et al. 2014

Geology

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“…radioactive mother-daughter isotopes during both partial melting and fluid activity. The Re-Os isotope system provides a way of overcoming this problem because Re is a moderately incompatible element whereas Os is a compatible element during partial melting of mantle peridotite, thereby making it possible to distinguish the Os isotopic characteristics of crust, lithospheric mantle, and asthenospheric mantle (Shirey and Walker, 1998;Xu et al, 2007;Callegaro et al, 2013). In this paper we provide high-precision Re-Os isotope data, and in combination with previous research, our comprehensive Os-Nd-Sr isotopic investigations of the ultrapotassic rocks of southern Tibet allow us to evaluate the source of the ultrapotassic volcanic rocks as well as constrain the dynamic mechanisms involved in the formation of the Tibetan Plateau.…”

Section: Introductionmentioning

confidence: 99%

Os–Nd–Sr isotopes in Miocene ultrapotassic rocks of southern Tibet: Partial melting of a pyroxenite-bearing lithospheric mantle?

Huang

Chen

et al. 2015

Geochimica et Cosmochimica Acta

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“…It cannot be ruled out, however, that prevalence of dikes over the much less abundant lavas is a distinguishing feature of the CAMP [12]. The orientation of early dikes varies from the NW in Guyana and in the southeast of the United States to near meridional in North Carolina and NE in Quebec and New England [11,47,58]. Occasion ally, in particular, in the margin north, between the Hartford and Fundy basins, giant dikes more than 150 km in extent have been mapped.…”

Section: Atlantic Margin Of the United States And Southeastern Canadamentioning

confidence: 99%

“…2). The large sills, like Rapidan and Palisade, 350 m and more in thickness, are apparently comagmatic with the entire body of volcanic rocks [11,42]. As follows from major element contents, all rocks are identified as basalts and basaltic andesites varying from quartz normative to olivine-hypersthene normative compo sitions.…”

Section: Atlantic Margin Of the United States And Southeastern Canadamentioning

confidence: 99%

Development of passive volcanic margins of the Central Atlantic and initial opening of ocean

Melankholina

Sushchevskaya

2015

Geotecton.

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Geological and geophysical data on the Central Atlantic are discussed in order to elucidate the tectonic setting of the initial magmatic activity, rifting, and breakup resulting in the origination of Mesozoic ocean. The structural, magmatic, and historical aspects of the problem are considered. It has been established that the initial dispersed rifting and low capacity magmatism at proximal margins was followed by the migra tion of the process toward the central part of region with the formation of distal zones and the development of vigorous magmmatism, further breakup of the lithosphere and ocean opening. Magmatism, its sources, and the features of newly formed magmatic crust at both the rifting and breakup stages of margin development are discussed and compared with subsequent spreading magmatism. Sr, Nd, and Pb isotopic compositions show that the magmatic evolution of the Central Atlantic proximal margins bears the features of two enriched components, one of which is related to the EM 1 source, developing only at the North American margin. Another enriched component typical of the province as a whole is related to the EM 2 source. To a lesser extent, this component is expressed in igneous rocks of Guyana, which also bear the signature of the MORB type depleted source typical of spreading tholeiites in the Atlantic Ocean. Similar conditions are assumed for subsequent magmatism at the distal margins and for the early spreading basalts in the adjacent Atlantic belt, which also contain a small admixture of enriched material. A comparison of the magmatism at the margins of Central and North Atlantic reveals their specificity distinctly expressed in isotopic compositions of igneous rocks. In contrast to the typical region of the North Atlantic, the immediate melting of the enriched lithos pheric source without the participation of plume related melts is reconstructed for the proximal margins of the Central Atlantic. At the same time, decompression and melting in the lithosphere could have been deter mined by the thermal effect of the Central Atlantic hot plume. This is testified by the intense melting in a short time interval over a vast area; the generation of rather homogeneous melts and creation of the thick magmatic crust; the radial arrangement of the dikes intruded in the course of plume ascent; as well as by the data of seis mic tomography indicating the occurrence of the hot upper mantle material, which has kept the "memory" of the action of a shallow seated Mesozoic plume. The formation of the Central Atlantic plume can be pre sumably regarded as a result of upwelling remobilisation adove the ancient African superplume and the rear rangement of the deep structure in Triassic and Jurassic times.

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Upper and lower crust recycling in the source of CAMP basaltic dykes from southeastern North America

Cited by 70 publications

References 91 publications

Microanalyses link sulfur from large igneous provinces and Mesozoic mass extinctions

Microanalyses link sulfur from large igneous provinces and Mesozoic mass extinctions

Os–Nd–Sr isotopes in Miocene ultrapotassic rocks of southern Tibet: Partial melting of a pyroxenite-bearing lithospheric mantle?

Development of passive volcanic margins of the Central Atlantic and initial opening of ocean

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