Results 81 to 90 of about 296 (107)

Reply to the Discussion by Mitchell and Tappe on “Kimberlites and aillikites as probes of the continental lithospheric mantle”

Lithos, 2010
Abstract We thank Mitchell and Tappe for giving us the opportunity to discuss the nature of kimberlite magmas. We agree with Mitchell and Tappe about the importance of mineralogy, but the mineralogy of interstitial phases in kimberlites can shed little light on the origin of kimberlite magmas.
D. Francis, M. Patterson
openaire   +1 more source

Petrogenesis of Early Cretaceous Carbonatite and Ultramafic Lamprophyres in a Diatreme in the Batain Nappes, Eastern Oman Continental Margin

Contributions To Mineralogy and Petrology, 2011
Salah Al-Khirbash, Sobhi Nasir, Hugh R. Rollinson   +2 more
exaly   +2 more sources

Petrology of Late Jurassic allochthonous ultramafic lamprophyres within the Batain Nappes, Northeastern Oman

, 2016
Late Jurassic ultramafic lamprophyre (UML) sills and dikes occur as 3 km-long intrusions within the allochthonous Whara Formation of the Batain nappes, eastern Oman.
S. Nasir
semanticscholar   +2 more sources

Zircon from the Chuktukon alkaline ultramafic carbonatite complex (Chadobets uplift, Siberian craton) as evidence of source heterogeneity

, 2021
The Chuktukon alkaline carbonatite complex is a part of the Chadobets complex, situated in the southwestern part of the Siberian craton. It is composed principally of aillikite-damtjernite and carbonatite and a host of Nb and REE mineralisation.
A. Doroshkevich, V. Sharygin, E. Belousova, I. Izbrodin, I. Prokopyev   +4 more
semanticscholar   +1 more source

Water contents and hydrogen isotope compositions of amphibole in aillikites from the Tarim large igneous province, NW China: Insight into Earth’s deep water cycle

Geological Society of America Bulletin, 2023
Water is known to play a crucial role in the generation of many large igneous provinces (LIP) worldwide, but the amount and origin of the water in their sources is still under debate. To address this question, this paper presents in situ major-, trace-element, and Sr isotope data coupled with bulk-mineral O-H-He isotope analyses of amphibole in a suite
Changhong Wang, Zhaochong Zhang, Andrea Giuliani, Hongze Bo, Lukáš Krmíček, Xiaoguang Li   +5 more
openaire   +1 more source

Olivine in ultramafic lamprophyres: chemistry, crystallisation, and melt sources of Siberian Pre- and post-trap aillikites

Contributions to Mineralogy and Petrology, 2018
We studied olivines from the Devonian pre-trap (the Ilbokich occurrence) and the Triassic post-trap (the Chadobets occurrence) carbonate-rich ultramafic lamprophyres (UMLs) in the southwestern portion of the Siberian craton. On the basis of detailed investigations of major, minor, and trace-element distributions, we have reconstructed the main ...
A. A. Nosova, L. V. Sazonova, A. V. Kargin, M. D. Smirnova, A. V. Lapin, V. D. Shcherbakov   +5 more
openaire   +1 more source

Kimberlite and carbonatite dykes within the Premier diatreme root (Cullinan Diamond Mine, South Africa): New insights to mineralogical-genetic classifications and magma CO2 degassing

Lithos, 2019
The ca. 1153 Ma Premier kimberlite pipe on the Kaapvaal craton has been intruded by late-stage kimberlite and carbonatite magmas forming discrete 0.5 to 5 m wide dykes within the lower diatreme.
A. Dongre, S. Tappe
semanticscholar   +1 more source

Petrogenetic Link Between Carbonatite and Silicate rocks in the Wajilitage Carbonatite Complex: Insights from In-situ Geochemical and Isotope Analysis of Apatite and Calcite

Journal of Petrology
The petrogenetic link between carbonatites and associated silicate rocks remains a longstanding debate in igneous petrology. Some minerals, such as apatite and calcite, which crystallize across diverse lithologies during magmatic differentiation, can ...
Zhi-Guo Cheng, Zhao-Chong Zhang, Zi-Liang Jin, Matthew J. Brzozowski   +3 more
semanticscholar   +1 more source

The newly discovered neoproterozoic aillikite occurrence in Vinoren (Southern Norway)

2020
During the period 750-600 Ma ago, prior to the final break-up of the supercontinent Rodinia, the crust of both the North American Craton and Baltica was intruded by significant amounts of rift-related magmas originating from the mantle. In the Proterozoic crust of Southern Norway, the 580 Ma old Fen carbonatite-ultramafic complex is a representative of
Zozulya, Dmitry R., Kullerud, Kare, Ribacki, Enrico (Dr.), Altenberger, Uwe (Dr.), Sudo, Masafumi (Dr.), Savchenko, Yevgeny E.   +5 more
openaire   +1 more source

Potassium isotopes reveal lithospheric control on the evolution of deep-sourced carbonated silicate magmas

Geology
Kimberlites and related CO2-rich ultramafic rocks such as aillikites commonly show Nd-Hf isotope decoupling (unradiogenic εHf at a given εNd), attributed to either recycled oceanic slabs or interaction with metasomatized continental lithospheric mantle ...
Zheng-Yu Long, F. Moynier, M. Bizzarro, Kun-Feng Qiu, Sebastian Tappe   +4 more
semanticscholar   +1 more source