Multi-stage magmatic history of olivine–leucite lamproite dykes from Banganapalle, Dharwar craton, India: evidence from compositional zoning of spinel

Kumar, Satya; Shaikh, Azhar M.; Patel, Suresh C.; Sheikh, Janisar M.; Behera, Duryadhan; Pruseth, Kamal Lochan; Ravi, S.; Tappe, Sebastian

doi:10.1007/s00710-020-00722-y

Cited by 8 publications

(13 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Further evolution from Mum to Ti-Mag is accompanied by the formation of atoll structures. There are several points of view on the origin of the atoll texture: (1) the structure of the atoll in spinel is a sign of resorption and is formed when the previously formed spinel dissolves [18,[48][49][50]; (2) the structure of the atoll could develop with supersaturation and rapid cruciform growth of spinel in the corners of the crystal, and the crystal faces did not have enough components to complete their growth [51]; and (3) spinel did not crystallize in the atoll lagoon due to the lack of necessary chemical components and/or the immiscibility of the spinel [27]. We suggest that the atoll texture in the present study is due to spinel resorption.…”

Section: Discussionmentioning

confidence: 99%

Compositional Variations of Spinels from Ultramafic Lamprophyres of the Chadobets Complex (Siberian Craton, Russia)

et al. 2021

View full text Add to dashboard Cite

Ultramafic lamprophyres (UMLs) are mantle rocks that provide important information about the composition of specific carbonate–silicate alkaline melts in the mantle as well as the processes contributing to their origin. Minerals of the spinel group typically occur in UMLs and have a unique “genetic memory.” Investigations of the spinel minerals from the UMLs of the Chadobets complex show the physicochemical and thermodynamic features of the alkaline rocks’ crystallization. The spinels of these UMLs have four stages of crystallization. The first spinel xenocrysts were found only in damtjernite pipes, formed from mantle peridotite, and were captured during the rising of the primary melt to the surface. The next stages of the spinel composition evolution are related to the high-chromium spinel crystallization, which changed to a high-alumina composition. The composition then changed to magnesian ulvöspinel–magnetites with strong decreases in the Al and Cr amounts caused by the release of carbon dioxide, rapid temperature changes, and crystallization of the main primary groundmass minerals such as phlogopite and carbonates. Melt inclusion analyses showed the predominance of aluminosilicate (phlogopite, clinopyroxene, and/or albite) and carbonate (calcite and dolomite) daughter phases in the inclusions that are consistent with the chemical evolution of the Cr-spinel trend. The further evolution of the spinels from magnesian ulvöspinel–magnetite to Ti-magnetite is accompanied by the formation of atoll structures caused by resorption of the spinel minerals.

show abstract

Section: Discussionmentioning

confidence: 99%

Compositional Variations of Spinels from Ultramafic Lamprophyres of the Chadobets Complex (Siberian Craton, Russia)

et al. 2021

View full text Add to dashboard Cite

show abstract

“…% Al 2 O 3 ) and can be defined as titanian magnesian chromites (Fig. 9; Kumar et al, 2021). Their FeO T content ranges from 26.2-32.7 wt.…”

Section: Spinelsmentioning

confidence: 99%

“…% MgO), can be defined as titanian chromites (Fig. 9; Kumar et al, 2021). Their FeO T (31.9-36.3 wt.…”

Section: Fe 2+mentioning

confidence: 99%

Mineralogy of the Marepalli lamproite dyke from the Nalgonda district, Telangana, Southern India

Saini

Kaur

Mitchell

et al. 2022

MinMag

View full text Add to dashboard Cite

The Marepalli dyke of the Vattikod cluster of the Ramadugu Lamproite Field, Nalgonda district, Telangana, India consists of pseudomorphed leucite, phlogopite (Al-poor, Ti-rich zoned phlogopite micas), pseudomorphed olivine, fluorapatite and Al-poor diopside embedded in groundmass consisting mainly of poikilitic Fe-rich titanian phlogopite and potassic amphibole. Other groundmass minerals are Al-Na-poor diopside, Al-poor spinels (titanian magnesian chromites-titanian chromites), Sr-rich fluorapatite and late-stage interstitial anhedral crystals of titanite and K-feldspar. The late-stage deuteric minerals present are REE-rich allanite, pyrite, magnetite, chalcopyrite, galena, hydro-zircon, carbonates (calcite, witherite, strontianite), baryte and cryptocrystalline SiO 2 . Apatite is an early crystallising phase and is present as inclusions in phlogopite and pyroxene. Phlogopite and amphibole occur as inclusions in titanite and K-feldspar. The compositional trends of phlogopite are of almost constant Al 2 O 3 content with FeO T and TiO 2 enrichment, and are typical of lamproitic micas. The FeO T enrichment is additionally accompanied by MgO depletion (reflecting VI Fe 2+ enrichment) from core to rim together with a slight increase in the tetraferric iron component. Diopside is characterised by < 0.4 wt. % alumina and < 0.6 wt. % sodium contents and exhibits typical lamproitic affinity. The spinels are alumina-poor with un-evolved titanian magnesian chromite-titanian chromite compositions. The presence of Krichterite, as an abundant amphibole, indicates a lamproite affinity and on the basis of the typomorphic mineralogy, this rock is classified as a -pseudoleucite-amphibole-phlogopite lamproite‖. The Marepalli lamproite shows significant difference in compositional ranges of phlogopite, amphibole, pyroxene and spinel in comparison to those reported from the Vattikod, Gundrapalli, Ramadugu, Somavarigudem and Yacharam lamproites of Ramadugu

show abstract

“…Some samples have low MgO, Al2O3, and Cr2O3 contents and high FeOt and TiO2 contents, indicating far greater modification than type I chromite (Figure 4). Particularly, Fe-rich chromite rims in zoned chromite formed during serpentinization and chloritization [14,20,54,59]. The loss of Al, Mg, and Cr may be caused by chloritization, which involved the reaction of chromite, olivine, and magnetite to produce Fe-rich chromite rim and chlorite [20].…”

Section: Primary and Magmatic Chromitementioning

confidence: 99%

“…It has thus been an important petrogenetic indicator in mantle-origin rocks, such as implications for parental magma conditions, mantle source, and tectonic setting [3][4][5][6][7][8][9]. On the other hand, post-magmatic hydrothermal alteration, metamorphism, and subsolidus re-equilibration have significant effects on chromite composition [10][11][12][13][14]. Modified chromite has fingerprinted the alteration processes, while magmatic chromite with primary composition has traced the nature of parental magma.…”

Section: Introductionmentioning

confidence: 99%

Origin and Nature of Parental Magma and Sulfide Segregation of the Baixintan Magmatic Ni–Cu Sulfide Deposit, Southern Central Asian Orogenic Belt (CAOB), NW China: Insights from Mineral Chemistry of Chromite and Silicate Minerals

et al. 2020

View full text Add to dashboard Cite

The mineral chemistry of chromite and silicate minerals in the Baixintan magmatic Ni-Cu sulfide deposit in the Northern Tianshan, southern Central Asian Orogenic Belt (CAOB) are reported here. Two types of chromite were identified in mafic-ultramafic rocks. Type I chromite occurs as inclusions encased in olivine and has a primary and magmatic origin and homogeneous composition with Cr# values (49–66). It is characterized by high Ti contents (0.33–1.52 wt%) and small quantities of ZnO (0–0.21 wt%), MnO (0.28–0.45 wt%), and NiO (0.06–0.24 wt%) contents. In contrast, type II chromite with interstitial phase and larger compositional variations has significantly higher TiO2 (up to 6.2 wt%) and FeOt contents (up to 69.3 wt%) and slightly lower Al2O3 (minimum 3.0 wt%) and MgO contents (minimum 0.53 wt%). It is considered to crystallize from a more evolved and fractionated melt and suffers from post-magmatic alteration, such as serpentinization and chloritization. The olivine has forsterite values (Fo) varying from 76.8 to 85.6. The parental magma is characterized by high temperature (1389 °C), high pressure (3.8 Gpa), and high Mg content (11.4 wt%) with oxidized (FMQ + 1.6) and hydrous nature based on compositions of primary chromite and olivine–chromite pairs. The intrusion originated from high-degree partial melting of depleted mantle that had been modified by crustal components and metasomatized by subduction fluid in a post-orogenic extensional setting. Two stages of sulfide segregation have been recognized. Early segregation led to the depletion of platinum group elements (PGE), and disseminated sulfide mineralization was the product of later segregation. The assimilation of crustal Si and S components played more important roles on sulfide segregation rather than fractional crystallization.

show abstract

Multi-stage magmatic history of olivine–leucite lamproite dykes from Banganapalle, Dharwar craton, India: evidence from compositional zoning of spinel

Cited by 8 publications

References 88 publications

Compositional Variations of Spinels from Ultramafic Lamprophyres of the Chadobets Complex (Siberian Craton, Russia)

Compositional Variations of Spinels from Ultramafic Lamprophyres of the Chadobets Complex (Siberian Craton, Russia)

Mineralogy of the Marepalli lamproite dyke from the Nalgonda district, Telangana, Southern India

Origin and Nature of Parental Magma and Sulfide Segregation of the Baixintan Magmatic Ni–Cu Sulfide Deposit, Southern Central Asian Orogenic Belt (CAOB), NW China: Insights from Mineral Chemistry of Chromite and Silicate Minerals

Contact Info

Product

Resources

About