Olivine trace element compositions in diamondiferous lamproites from India: Proxies for magma origins and the nature of the lithospheric mantle beneath the Bastar and Dharwar cratons

Shaikh, Azhar M.; Patel, Suresh C.; Bussweiler, Yannick; Kumar, Satya; Tappe, Sebastian; Ravi, S.; Mainkar, Datta

doi:10.1016/j.lithos.2018.11.026

Cited by 34 publications

(20 citation statements)

References 79 publications

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“…Mineralogy of mantle sources can be deduced from minor and trace element in olivine over a range of igneous rocks, including basalts (Hagerty et al 2006;Sobolev et al 2007), lamproites (Ammannati et al 2016;Shaikh et al 2019;Chayka et al 2020 (Veter et al 2017;Nosova et al 2018;Rooney et al 2020). In this section, we will use minor elements (Ni, Mn, Ca), combined with trace elements (Li, Zn, Sc, Ti, Co), in olivine to discriminate between pyroxenitic and peridotitic mantle source lithologies and identify different metasomatic agents in the source.…”

Section: Mantle Source Lithologies Of Aillikite Meltsmentioning

confidence: 99%

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Olivine from aillikites in the Tarim large igneous province as a window into mantle metasomatism and multi-stage magma evolution

Wang

Zhang

Xie

et al. 2021

American Mineralogist

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Aillikites are carbonate-rich ultramafic lamprophyres and although they are volumetrically minor components of large igneous province (LIP), these rocks provide important clues to melting and metasomatism in the deep mantle domain during the initial stages of LIPs. In this study, we investigate the Wajilitag 'kimberlites' in the northwestern part of the Tarim LIP which we redefine as hypabyssal aillikites based on the following features: (i) micro-phenocrystic clinopyroxene and Ti-rich andradite garnet occurring in abundance in the carbonate-rich matrix; (ii) Cr-spinel exhibiting typical Fe-Ti enrichment trend also known as titanomagnetite trend; and (iii) olivine showing dominantly low-Mg values (Fo < 90). In order to constrain the magma source and evolution, the major, minor and trace element abundance in olivine grains from these rocks were analyzed using electron microprobe and laser ablation-inductively coupled plasma-mass spectrometry. Olivine in the aillikites occurs as two textural types: (i) groundmass olivines, as sub-rounded grains in matrix; and (ii) macrocrysts, as euhedral-anhedral crystals in nodules. The groundmass olivines show varying Fo89-80 with high Ni (1606-3418 ppm) and Mn (1424-2860 ppm) and low Ca (571-896 ppm) contents. In contrast, the macrocrysts exhibit restricted Fo range but a wide range in Ni and Mn. The former occur as phenocrysts, whereas the latter are cognate cumulates that formed from earlier, evolved aillikite melt. The two olivine populations can be further divided into subgroups , indicating a multi-stage crystallization history of the aillikite melt. The crystallization temperatures of groundmass olivines and macrocrysts in dunite nodules as computed from the spinel-olivine thermometers are 1005-1136°C and This is the peer-reviewed, final accepted version for American Mineralogist, published by the Mineralogical Society of America. The published version is subject to change. Cite as Authors (Year) Title. American Mineralogist, in press.

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Section: Mantle Source Lithologies Of Aillikite Meltsmentioning

confidence: 99%

“…4e-4f and 5a). The results of olivine analyses are presented in Appendix Tables S1 and S3.Major and minor elementsBivariate element plots help in distinguishing different olivine populations(Shaikh et al 2019). As shown inFig.…”

mentioning

confidence: 99%

Olivine from aillikites in the Tarim large igneous province as a window into mantle metasomatism and multi-stage magma evolution

Wang

Zhang

Xie

et al. 2021

American Mineralogist

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“…as the first known primary diamond deposit in any igneous rock. Many rocks previously classified as lamproite (sensu lato) are actually leucitite and related rock types (Lustrino et al 2016(Lustrino et al , 2019, and many "kimberlites and minettes" in the Dharwar, Baster, and Singhbhum cratons of India are now reclassified as lamproite (Mitchell and Fareeduddin 2009;Fareeduddin and Mitchell 2012;Gurmeet Kaur and Mitchell 2013;Shaikh et al 2019). Note that recently recognized lamproites are not given type locality names (e.g.…”

Section: Etymology Of Lamproitesmentioning

confidence: 99%

“…Raniganj Province (Mukherjee 1961;Mitchell and Fareedduddin 2009). Shaikh et al (2019) have concluded from an investigation of the trace element compositions of olivine in Wajrakarur (dykes CC2 and P13) and the Kodomali-Behradih lamproites that a hotter paleogeotherm existed in the lithospheric mantle beneath the Eastern Dharwar craton at 1 100 Ma than beneath the Bastar craton at ~ 65 Ma. In addition, it is proposed that the Eastern Dharwar craton experi- Kaur et al 2018).…”

Section: Indian Lamproitesmentioning

confidence: 99%

“…The recent geophysical studies of the Kaapvaal and Indian cratons are instructive as they indicate that the ancient metasomatic sources of lamproites are no longer present, having been removed by younger tectonic events. Hence, the depths and temperatures of lamproite magma generation in the lithospheric mantle that have been estimated by the geothermobarometry of entrained eclogite and ultrabasic xenoliths refer to the paleo-configuration of the craton and not its current state (Shaikh et al 2019). These observations, and the work of Celli et al (2020), have implications for the genesis and preservation of lithospheric metasomes and highlight the need for detailed studies of the current and past structure of cratons.…”

Section: Indian Lamproitesmentioning

confidence: 99%

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

Mitchell

2020

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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 nomenclature of lamproite results in the recommendation that members of the lamproite petrological clan be named using mineralogical-genetic classifications to distinguish them from other genetically unrelated potassic alkaline rocks, kimberlite, and diverse lamprophyres. The names “Group 2 kimberlite” and “orangeite” must be abandoned as these rock types are varieties of bona fide lamproite restricted to the Kaapvaal Craton. Lamproites exhibit extreme diversity in their mineralogy which ranges from olivine phlogopite lamproite, through phlogopite leucite lamproite and potassic titanian richterite-diopside lamproite, to leucite sanidine lamproite. Diamondiferous olivine lamproites are hybrid rocks extensively contaminated by mantle-derived xenocrystic olivine. Currently, lamproites are divided into cratonic (e.g. Leucite Hills, USA; Baifen, China) and orogenic (Mediterranean) varieties (e.g. Murcia-Almeria, Spain; Afyon, Turkey; Xungba, Tibet). Each cratonic and orogenic lamproite province differs significantly in tectonic setting and Sr–Nd–Pb–Hf isotopic compositions. Isotopic compositions indicate derivation from enriched mantle sources, having long-term low Sm/Nd and high Rb/Sr ratios, relative to bulk earth and depleted asthenospheric mantle. All lamproites are considered, on the basis of their geochemistry, to be derived from ancient mineralogically complex K–Ti–Ba–REE-rich veins, or metasomes, in the lithospheric mantle with, or without, subsequent contributions from recent asthenospheric or subducted components at the time of genesis. Lamproite primary magmas are considered to be relatively silica-rich (~50–60 wt.% SiO2), MgO-poor (3–12 wt.%), and ultrapotassic (~8–12 wt.% K2O) as exemplified by hyalo-phlogopite lamproites from the Leucite Hills (Wyoming) or Smoky Butte (Montana). Brief descriptions are given of the most important phreatomagmatic diamondiferous lamproite vents. The tectonic processes which lead to partial melting of metasomes, and/or initiation of magmatism, are described for examples of cratonic and orogenic lamproites. As each lamproite province differs with respect to its mineralogy, geochemical evolution, and tectonic setting there is no simple or common petrogenetic model for their genesis. Each province must be considered as the unique expression of the times and vagaries of ancient mantle metasomatism, coupled with diverse and complex partial melting processes, together with mixing of younger asthenospheric and lithospheric material, and, in the case of many orogenic lamproites, with Paleogene to Recent subducted material.

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Kimberlite pre-conditioning of the lithospheric mantle and implications for diamond survival: a case study of olivine and mantle xenocrysts from the Koidu mine (Sierra Leone)

Howarth,

Giuliani,

Bussweiler

et al. 2024

Miner Deposita

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The diamond potential of kimberlites is generally determined using indicator minerals (i.e., xenocrysts), entrained by the parent magma while ascending through the sub-continental lithospheric mantle (SCLM). It is becoming increasingly apparent that olivine can also be used to understand mantle sampling depth, using the Al-in-olivine thermometer, and to constrain the extent of diamond-destructive metasomatism in the SCLM. To further current understanding of vertical sampling and diamond preservation in the SCLM, we present geochemical results for kimberlitic olivine of the Koidu mine (Sierra Leone). We combine our olivine data with pressure-temperature estimates from available olivine diamond inclusions, clinopyroxene xenocrysts, and eclogite xenoliths to visualise the vertical distribution of lithologies in the SCLM beneath Koidu. In agreement with the absence of peridotitic olivine and low abundance of olivine diamond inclusions in the lower SCLM, megacrysts appear to dominate the material sampled from the lowermost lithosphere. At shallower levels a distinct eclogite-dominated region is observed (160-180 km) whereas the SCLM at depths of 110-150 km is heterogeneous comprising depleted harzburgite/dunite, lherzolite, and eclogite. Diamonds are predominantly eclogitic with pressure-temperature estimates for diamondiferous eclogites of 150-190 km within the eclogite-dominated region. The near absence of diamonds sampled from near the lithosphere-asthenosphere boundary is attributed to diamond destruction by extensive infiltration of proto-kimberlite melts leading to metasomatism of the eclogite and peridotite substrate and megacrysts formation. Widespread metasomatism of the deepest reaches of the SCLM sampled by kimberlites elsewhere suggests that Koidu does not represent an isolated case and the extent of diamond-destructive metasomatism can be constrained using olivine xenocrysts.

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Olivine trace element compositions in diamondiferous lamproites from India: Proxies for magma origins and the nature of the lithospheric mantle beneath the Bastar and Dharwar cratons

Cited by 34 publications

References 79 publications

Olivine from aillikites in the Tarim large igneous province as a window into mantle metasomatism and multi-stage magma evolution

Olivine from aillikites in the Tarim large igneous province as a window into mantle metasomatism and multi-stage magma evolution

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

Kimberlite pre-conditioning of the lithospheric mantle and implications for diamond survival: a case study of olivine and mantle xenocrysts from the Koidu mine (Sierra Leone)

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