Explanipedia

Mineralogy of a cuspidine–hiortdahlite–wollastonite skarn associated with the Sierra La Vasca alkaline complex, Mexico Open

Roger H. Mitchell, Antonio Pereira‐Vega · 2025

The Tertiary Sierra La Vasca intrusive complex of the Mexican Eastern Alkaline Province consists of diverse alkaline-to-peralkaline granitoids and syenites and is a rare example of silica oversaturated peralkaline magmatism characterized b…

Composition and paragenesis of daqingshanite from the Kamthai carbothermalite, Rajasthan, India Open

Roger H. Mitchell · 2024

Daqingshanite in the Kamthai REE deposit (India) occurs as two paragenetic types: primary granular coarse grained crystals coexisting with primary carbocernaite, baryte and bastnäsite; and as aligned micro-ovoid globules within clasts of S…

Magmatic and post-magmatic evolution of the Newania carbonatite complex, Rajasthan, north-western India Open

Amritpaul Singh, Roger H. Mitchell, Gurmeet Kaur, D. Srinivasa Sarma · 2023

This work describes the mineralogy of dolomite carbonatite occurring at the Newania carbonatite complex, Rajasthan, north-western India. The mineralogy records the textural and compositional features of magmatic and post-magmatic stages of…

The genesis of calcite and dolomite carbonatite-forming magma by liquid immiscibility: a critical appraisal Open

J. Gittins, Roger H. Mitchell · 2023

Liquid immiscibility has become the preferred mode of genesis for the carbonatite rocks, which commonly, but not exclusively, accompany silicate rocks in alkaline-rock complexes. This concept has been universally based on the presumption t…

Ca isotope compositions of Prairie Lake carbonatite complex Open

Jian Sun, Xiangkun Zhu, Roger H. Mitchell, Fu‐Yuan Wu, Helen Maria Williams · 2023

Reconstruction of magma chamber processes preserved in olivine-phlogopite micro-ijolites from the Oldoinyo Lengai, Tanzania Open

Noémi Halász, Márta Berkesi, Tivadar M. Tóth, Roger H. Mitchell, Ralf Milke , et al. · 2022

Petrology and Sr–Nd isotope geochemistry of Mosonik: a polygenetic phonolitic nephelinite–phonolite volcano located in the North Tanzanian Divergence of the East African Rift Open

Roger H. Mitchell, J. B. Dawson · 2022

Mosonik, a 3.25 Ma extensively dissected stratovolcano located in the North Tanzanian Divergence of the East African Rift, consists predominantly of phonolite and three types of phonolitic nephelinite distinguished by the presence or absen…

Scavenging and release of REE and HFSE by Na-metasomatism in magmatic-hydrothermal systems Open

Wu‐Bin Yang, He‐Cai Niu, Ningbo Li, Pete Hollings, Shannon Zurevinski , et al. · 2022

Mount Mather Creek, British Columbia – a new sodalite-bearing carbohydrothermal breccia deposit including a new Canadian occurrence for the rare minerals edingtonite and quintinite Open

P. C. Piilonen, Glenn Poirier, Ralph Rowe, Roger H. Mitchell, Chris Robak · 2022

The Mount Mather Creek sodalite-bearing carbohydrothermal breccia dyke is located ~35 km northwest of Golden, British Columbia, Canada, within the Foreland Belt on the eastern side of the Mississippian-to-Devonian British Columbia Alkaline…

EDITORIAL: Creating testable questions in practical conservation: a process and 100 questions Open

William J. Sutherland, Jake M. Robinson, David C. Aldridge, Tim Alamenciak, Matthew Armes , et al. · 2022

It is now clear that the routine embedding of experiments into conservation practice is essential for creating reasonably comprehensive evidence of the effectiveness of actions. However, an important barrier is the stage of identifying tes…

IUGS Classification of Igneous Rocks revisited: Update from the new Task Group Open

Sebastian Tappe, Michele Lustrino, James M.D. Day, Georg F. Zellmer, Roger H. Mitchell · 2022

NFD Methodology Report Open

Walter Beyeler, Tom Corbett, Don Shirah, A. T. Williams, Roger H. Mitchell · 2021

The NetFlow Dynamics (NFD) model was developed for estimating the availability of a commodity supplied by a national- or regional-scale infrastructure following unexpected disruption of one or more of its components. The large scope of the…

Igneous Rock Associations 26. Lamproites, Exotic Potassic Alkaline Rocks: A Review of their Nomenclature, Characterization and Origins Open

Roger H. Mitchell · 2020

Lamproite is a rare ultrapotassic alkaline rock of petrological importance as it is considered to be derived from metasomatized lithospheric mantle, and of economic significance, being the host of major diamond deposits. A review of the no…

Kimberlite genesis from a common carbonate-rich primary melt modified by lithospheric mantle assimilation Open

Andrea Giuliani, D. Graham Pearson, Ashton Soltys, Hayden Dalton, David Phillips , et al. · 2020

Diamond-bearing kimberlites were born from similar melts in the deep Earth and variably modified during ascent.

Mantle lithosphere beneath Wyoming based on Sloan and Kelsey lake – I kimberlite xenocrysts Open

Igor Ashchepkov, Hilary Downes, Roger H. Mitchell, N. V. Vladykin, S. V. Palessky · 2019

Mutually consistent classification schemes for mantle-derived garnet and chromite, for use by diamond explorers Open

Herman Grütter, Andrew Menzies, John Gurney, Eva Anckar, Dave Bell , et al. · 2019

Constraining the crust and mantle contributions to kimberlite: a multi-phase micro-sampling approach Open

J. Malarkey, D Pearson, Geoff Nowell, J. Davidson, Chris J. Ottley , et al. · 2019

Tuffisitic kimberlites: mineralogical characteristics relevant to their formation Open

Roger H. Mitchell, E Michael, W. R. Skinner, Barbara H. Scott Smith · 2019

Tuffisitic kimberlites (TK) are the dominant components of many kimberlite pipes in southern Africa.These rocks are distinct from all other textural varieties of kimberlite.The objective of this study is to investigate the optically intrac…

Mineralogy of kimberley-type pyroclastic kimberlite and the transition to hypabyssal kimberlite Open

Roger H. Mitchell, Barbara H. Scott Smith · 2019

Kimberlites: descriptive geological nomenclature and classification Open

B. Holly Smith, Tom Nowicki, James K. Russell, Kevin J. Webb, Casey Hetman , et al. · 2019

Mineralogy of the baotite-bearing Gundrapalli lamproite, Nalgonda district, Telangana, India Open

Gurmeet Kaur, Roger H. Mitchell · 2019

We describe the mineralogy of a lamproite dyke from Gundrapalli village (Nalgonda district), Telangana, India. The dyke consists of a mineral assemblage characteristic of lamproites in terms of the presence of amphiboles (mainly potassic-r…

Organizing Committee Open

Roger H. Mitchell, John P. Armstrong, Ken Armstrong, Dante Canil, Jon Carlson , et al. · 2019

A new layout and update for <i>Mineralogical Magazine</i> in 2019 Open

Stuart J. Mills, Roger H. Mitchell, Helen C. Kerbey · 2019

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Accessory Rare Earth. Strontium, Barium and Zirconium Minerals in the Benfontein and Wesselton Calcite Kimberlites Open

Roger H. Mitchell · 2019

Calcite kimberlites are rocks formed from highly differentiated kimberlite magma.As such they might be expected to possess an unusual mineralogy as a consequence of the concentration of incompatible elements in these residual magmas.To exa…

Geology and exploration of the Rose lamproite. South East Kansas, USA Open

Southeast Kansas, H Coopersmith, Roger H. Mitchell · 2019

Mineralogy, petrology and petrogenesis of the kimberlite from Somerset Island, N.W.T., Canada Open

Canada Clarke, Roger H. Mitchell · 2019

Mitchell and Fritz (1973) have given the first general description of the location, tectonic setting and mineralogy of the Somerset Island kimberlite.This paper deals with the mineralogy and texture in detail, interprets the crystalliza¬ t…

Mineralogy of the Tunraq kimberlite, Somerset Island, N.W.T.; Canada Open

Somerset Island, Northern Affairs Canada, Roger H. Mitchell · 2019

The statistical classification of kimberlite garnet by divisive cluster analysis and multiple discriminant analysis Open

Bruce C. Jago, Roger H. Mitchell, Lakehead Univeristy · 2019

What’s in a Name? Suggestions for Revisions to the Terminology of Kimberlites and Lamprophyres from a Genetic Viewpoint Open

Roger H. Mitchell · 2019

methoas ot anaiysl.ta tB.a.t,mi"atioS'^oI S"heiiSl"'" and isotopic composition of rocks and minerals ^ advances have not been matched by changes in our approach to the terminology of alkaline rocks.Modal classifications have remained essen…

Mineralogy of micaceous kimberlites from the New Elands and Star Mines, Orange Free State, South Africa Open

Roger H. Mitchell, Henry O. A. Meyer · 2019

Micaceous kimberlites occur at the New Elands and Star Mines,Orange Free

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