New &lt;sup&gt;40&lt;/sup&gt;Ar-&lt;sup&gt;39&lt;/sup&gt;Ar ages and petrogenesis of the Massif d'Ambre volcano, northern Madagascar

Cucciniello, Ciro; Melluso, Leone; Morra, Vincenzo; Storey, Michael; Rocco, Ivana; Franciosi, Luigi; Grifa, Celestino; Petrone, Chiara Maria; Vincent, Modeste

doi:10.1130/2011.2478(14)

Cited by 19 publications

(8 citation statements)

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“…We wish to explore the quantitative relationship between basaltic magmatism, dynamic topography, and mantle convective processes that occur beneath the lithospheric plate. Our starting point is the acknowledgment that the combination of tectonic setting and observed isotopic signatures rule out a subduction‐related explanation and instead favor an intraplate source (e.g., Cucciniello et al., 2011; Melluso et al., 2016). It is possible that decompression melting of a subplate source could be driven by anomalously high asthenospheric temperature, by passive upwelling caused by lithospheric thinning, by mantle flow, or by some combination of all three mechanisms.…”

Section: Mafic Magmatismmentioning

confidence: 98%

“…Minor volumes of intraplate Neogene magmatism occur through Madagascar and on adjacent islands (Figure 2d;Cucciniello et al, 2011Cucciniello et al, , , 2017Cucciniello et al, , 2018Emerick & Duncan, 1982;Melluso & Morra, 2000;Melluso et al, 2016). There are two significant provinces: the Ankaratra and the neighboring Itasy volcanic fields located on the Antananarivo Plateau; and the northern volcanic zone, which comprises Nosy Bé, the Ampasindava Peninsula, Ankaizina, Amparihy, Massif d'Ambre, and the Babaomby region at the northernmost tip.…”

Section: Mafic Magmatismmentioning

confidence: 99%

“…Mafic and ultramafic rocks from the Massif d'Ambre and Babaomby regions are highly alkaline to tholeiitic and have an age range of 10.15–0.83 Ma (Cucciniello et al., 2011; Emerick & Duncan, 1982; Melluso & Morra, 2000). The Nosy Bé archipelago is characterized by alkali basalts, basanites, gabbro, and phonolites with more evolved syenites and rhyolites with an age range of 23.7–0.55 Ma (Bardintzeff et al., 2010; Emerick & Duncan, 1982; Melluso et al., 2016).…”

Section: Mafic Magmatismmentioning

confidence: 99%

“…The Nosy Bé archipelago is characterized by alkali basalts, basanites, gabbro, and phonolites with more evolved syenites and rhyolites with an age range of 23.7–0.55 Ma (Bardintzeff et al., 2010; Emerick & Duncan, 1982; Melluso et al., 2016). In the Central Highlands, the Ankaratra province is characterized by nephelinites, basanites, and tholeiitic basalts as well as more evolved trachytes and phonolites (e.g., Cucciniello et al., 2011). Here, K‐Ar dates range from 27.9 to 2.86 Ma, and Ar‐Ar dates range from 17.45 to 0.031 Ma (Bardintzeff et al., 2010; Buchwaldt, 2006; Cucciniello et al., 2017; Melluso et al., 2016; Rasoazanamparany et al., 2021).…”

Section: Mafic Magmatismmentioning

confidence: 99%

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Cenozoic Dynamic Topography of Madagascar

Stephenson

White

Carter

et al. 2021

Geochem Geophys Geosyst

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It has been proposed that Oligo‐Miocene regional uplift of Madagascar was generated and is maintained by mantle dynamical processes. Expressions of regional uplift include flat‐lying Upper Cretaceous‐Paleogene marine limestones that crop out at elevations of hundreds of meters along the western seaboard and emergent Quaternary coral‐rich terraces that rim the coastline. Here, we explore the history of subcrustal topographic support through a combined analysis of four sets of observational constraints. First, we exploit published receiver function estimates of crustal thickness and spectral admittance between gravity and topography. An admittance value of ∼+40 ± 10 mGal km−1 at wavelengths >500 km implies that ∼1 km of topography is supported by subcrustal processes. Secondly, new apatite fission‐track and helium measurements from 18 basement samples are inverted, constraining temperature and denudation histories. Results suggest that 0.5–1.6 km of regional uplift occurred after ∼30 Ma. Thirdly, we calculate a history of regional uplift by minimizing the misfit between observed and calculated longitudinal river profiles. Results suggest that topography was generated during Neogene times. Finally, inverse modeling of rare earth element concentrations in Neogene mafic rocks indicates that melting of the asthenospheric source occurred at depths of ≤65 km with potential temperatures of 1300–1370 °C. Melting occurred at higher temperatures beneath Réunion Island and northern Madagascar and at lower temperatures beneath the Comores and southern Madagascar. These inferences are consistent with shear wave velocities obtained from tomographic models. We conclude that Madagascar is underlain by thinned lithospheric mantle and that a thermal anomaly lies within an asthenospheric layer beneath northern Madagascar.

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Section: Mafic Magmatismmentioning

confidence: 98%

Section: Mafic Magmatismmentioning

confidence: 99%

Section: Mafic Magmatismmentioning

confidence: 99%

Section: Mafic Magmatismmentioning

confidence: 99%

See 2 more Smart Citations

Cenozoic Dynamic Topography of Madagascar

Stephenson

White

Carter

et al. 2021

Geochem Geophys Geosyst

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“…The alkali basalt/basanite-trachyte-phonolite suite of sodic affinity is commonly observed in within-plate tectonic settings (e.g., Nyambeni, Brotzu et al 1983;Sardinia, Fedele et al, 2007;French Massif Central, Wilson et al, 1995;Madagascar, Melluso et al 2007;Cucciniello et al, 2011;SE Brazil, Brotzu et al, 2005, 2007Saudi Arabia, Moufti et al, 2012). Major and trace element variations among the Gharyan rocks can be quantitatively interpreted as the effect of fractional crystallization processes.…”

Section: Mafic-intermediate Rock Relationshipsmentioning

confidence: 96%

Petrogenesis of Cenozoic volcanic rocks in the NW sector of the Gharyan volcanic field, Libya

Lustrino

Cucciniello

Melluso

et al. 2012

Lithos

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On the brink – investigating biodiversity in endangered crater lakes of the Amber Mountains National Park (Madagascar)

Schabetsberger

Kaiser

Rott

et al. 2012

Aquatic Conservation

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1. Madagascar's biodiversity is vanishing at an alarming pace. The documentation of this loss has so far focused on terrestrial habitats and organisms. Eight volcanic crater lakes in the Amber Mountains National Park (Northern Madagascar) and surroundings were investigated for the first time to describe limnological conditions and aquatic biodiversity. Seven of the lakes were affected by deforestation/logging and fish introduction and only one lake was assumed to have remained in pristine condition. In the deeper lakes (> 5 m) steep physico-chemical gradients and anoxic hypolimnia were observed.2. Algae, hydrozoans, nematodes, rotifers, annelids, copepods, cladocerans, ostracods, and mites were identified to genus or species level. The majority were taxa with a cosmopolitan or tropicopolitan distribution. The highest number of afrotropical and endemic species were recorded within the crustaceans.3. Multivariate analysis of species communities revealed significant differences between lakes in deforested and forested catchments. Introduced alien fish had no detectable effect on species assemblages. 4. Illegal harvest of timber was observed within the National Park and drug plantations are less than 1 km away from the last pristine crater lake. If deforestation continues at the current rate, which is likely under the prevailing political situation, the last undisturbed lake communities may be altered in the near future.5. There is an urgent need for taxonomic research to assess the biodiversity of algae and micrometazoa. Highest priority should be given to pristine freshwater ecosystems within protected areas.

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New <sup>40</sup>Ar-<sup>39</sup>Ar ages and petrogenesis of the Massif d'Ambre volcano, northern Madagascar

Cited by 19 publications

References 0 publications

Cenozoic Dynamic Topography of Madagascar

Cenozoic Dynamic Topography of Madagascar

Petrogenesis of Cenozoic volcanic rocks in the NW sector of the Gharyan volcanic field, Libya

On the brink – investigating biodiversity in endangered crater lakes of the Amber Mountains National Park (Madagascar)

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