Simple steps for the detection and classification of different lamprophyric rocks: a case study from Greece

Kamvisis, Ioannis-Nektarios G.; Vasyukova, Elena

doi:10.2478/mipo-2021-0001

Cited by 3 publications

(1 citation statement)

References 21 publications

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“…6). The original sediments must Table 1 Major oxides: Akluilâk lamprophyre 325D (McRae et al, 1996), Wawa lamprophyre NL-37 (Lefebvre, 2004), Kavala lamprophyre GL22 (Kamvisis and Vasyukova, 2021) and Phillipi MME YD8 (Eleftheriadis et al, 1995) Sample → 325D NL-37 GL22 YD8 have originated from the weathering of a non-kimberlitic source due to lack of diamond indicators (e.g., G10 garnet, Cr-diopside, magnesiochromite, picroilmenite).…”

Section: Discussionmentioning

confidence: 99%

Adamas as diamond and its occurrence near Ancient Philippi in Macedonia, northern Greece

Kamvisis¹,

Phani²

2023

GeolBalc

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The adamas of Ancient peoples is proved to be the precious diamond. An ancient and uconventional diamond occurrence, the mines of Philippi in Macedonia (northern Greece), is geologically explained here. The most probable source is believed to be flat subduction-related (shoshonitic) lamprophyres that originated at a depth of >110 km within the mantle in the diamond stability field. The thick lithospheric mantle beneath Greece supports the occurrence of diamondiferous lamprophyric rocks in this area. However, no lamprophyre outcrops have been found, except for a few lamprophyre dikes 14 km SE of Philippi. Another explanation for the occurrence would implicate detrital diamonds that have been preserved in the local greenschist facies rocks. The XRD analysis of Philippi paragneiss showed the existence of the mantle mineral magnesiowüstite, which is a possible diamond indicator. The Philippi occurrence deserves detailed investigation involving alluvial sampling and ground magnetic surveys to locate the diamond source.

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Section: Discussionmentioning

confidence: 99%

Adamas as diamond and its occurrence near Ancient Philippi in Macedonia, northern Greece

Kamvisis¹,

Phani²

2023

GeolBalc

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The “Lamprophyre Clan” Revisited

Kamvisis¹,

Phani²

2022

Journal of the Geological Society of India

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A sequential genetic diagram is proposed for lamprophyres adopting their definitions, classification, petrological and geochemical signatures from an elaborated literature survey. Based on the definition of individual lamprophyric types, the existence of “Lamprophyre clan” of rocks is supported as it was first proposed by Rock in 1991. A diagram has been created for this purpose. Characteristic examples from India and their approximate spatial distribution in the eastern Dharwar craton in particular, have also been presented.

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Some notes on the IUGS classification of lamprophyric rocks

Kamvisis,

Phani

2024

Mineralogia

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The lamprophyric rocks are uncommon volatile-rich melanocratic porphyritic rocks which contain only mafic phenocrysts. The felsic minerals are confined in the groundmass. They occur as dikes, sills and diatremes. The lamprophyric rocks are sometimes associated with diamond deposits. This review article discusses the ongoing debate in igneous petrology regarding the classification of lamprophyric rocks, specifically the Lamprophyre clan vs Lamprophyre facies problem. The background of this debate is rooted in conflicting interpretations of the classification of these rocks, with some researchers grouping them into a super-group called the “Lamprophyre clan” while others emphasize the distinction between the different types of these rocks (Lamprophyre facies). The aim of this study is to provide a comprehensive analysis of relevant literature and propose a more inclusive petrological classification system for lamprophyric rocks by considering the geological setting, petrography, texture, mineralogy, whole-rock geochemistry and isotopic analysis of the various kimberlites, orangeites, lamproites, para-lamproites, calc-alkaline, alkaline and ultramafic lamprophyres. Lastly, the diamond potential is also taken into account. The implications of this study are significant for the international geological community. It proposes the adoption by the IUGS TGIR of both the Lamprophyre clan (as updated by Kamvisis & Phani, 2022, i.e. genetically interrelated rocks) and Lamprophyre facies (as suggested by Mitchell, 1994, i.e. rocks that formed under volatile-rich conditions) concepts to achieve a more widespread consensus among igneous petrologists. Both terms can be correct but they represent different perspectives in the study of these exotic rocks.

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Simple steps for the detection and classification of different lamprophyric rocks: a case study from Greece

Cited by 3 publications

References 21 publications

Adamas as diamond and its occurrence near Ancient Philippi in Macedonia, northern Greece

Adamas as diamond and its occurrence near Ancient Philippi in Macedonia, northern Greece

The “Lamprophyre Clan” Revisited

Some notes on the IUGS classification of lamprophyric rocks

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