Formation of authigenic monazite-(Ce) to monazite-(Nd) from Upper Carboniferous graywackes of the Drahany Upland: Roles of the chemical composition of host rock and burial temperature

Čopjaková, Renata; Novák, Milan; Franců, Eva

doi:10.1016/j.lithos.2011.08.001

Cited by 43 publications

(20 citation statements)

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“…Empirically determined correction factors for spectral line interferences of Y L γ 2 , Th M ζ 1 and Th M ζ 2 on Pb M α line, Th M γ on U M β line and Dy L α on Eu L β line were applied. More details concerning analytical conditions for monazite and ThSiO 4 are described in Breiter, Čopjaková, and Škoda (2009) and Čopjaková, Novák, and Franců (2011). The monazite age was calculated using the method of Montel, Foret, Veschambre, Nicollet, and Provost (1996).…”

Section: Methodsmentioning

confidence: 99%

Multi‐stage metamorphism by progressive accretion of continental blocks, example from the Western Hindu Kush

Moiny

Faryad

Čopjaková

et al. 2020

Journal Metamorphic Geology

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Basement rocks from the Western Hindu Kush preserve evidence of multiple metamorphic and magmatic events that occurred along the boundary between the Archean–Proterozoic Afghan Central and Afghan–Tajik Blocks. To verify the different metamorphic stages or events, mineral textures and phase equilibria in metamorphic basement rocks and their age relations to magmatic episodes have been investigated. Quartzofeldspathic gneiss and migmatite with lenses of amphibolite (with assumed Proterozoic age for their metamorphism) are intruded by the Triassic Hindu Kush granitoid batholith and small Cretaceous and Oligocene granite intrusions. The age of thermal overprint (210–170 Ma) by the Triassic batholith is confirmed by new monazite data. Both Triassic and Cretaceous granitoids and surrounding basement rocks underwent subsequent metamorphism up to epidote–amphibolite facies. The degree of this metamorphism increases southward at the contact to the Kabul Block, which under‐plates the Western Hindu Kush from the south. An early Miocene age was obtained by Pb–Th analyses in thorite and huttonite, which are close or slightly younger than the Oligocene granite in this area. The Cretaceous meta‐granodiorite near the border with the Kabul Block contains xenoliths of granulite facies rocks that could come from the Neoarchean granulite facies basement of the Kabul Block. The multi‐stage metamorphic and magmatic evolution classifies the Hindu Kush mountain belt as a long‐lived suture zone that was active since the early Palaeozoic. The results of this study support the interpretation about possible relations of the Afghan Central Blocks to the southern margin of Eurasia during the evolution of Para‐ and Neotethys.

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Section: Methodsmentioning

confidence: 99%

Multi‐stage metamorphism by progressive accretion of continental blocks, example from the Western Hindu Kush

Moiny

Faryad

Čopjaková

et al. 2020

Journal Metamorphic Geology

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“…These types of monazites are also found as hydrothermal precipitates [57][58][59] or in carbonatites (e.g., [60][61][62][63]). We would anticipate higher ThO 2 content in igneous monazite (3 to >5 wt % ThO 2 ) compared to hydrothermal (0-1 wt % ThO 2 ) [50] or authigenic grains (e.g., 0.63 wt % ThO 2 , <0.18 wt % UO 2 ) [52]. Although the bright core in monazite grain 1 (Figure 2A) suggests a different origin from the rest of the grain, its sieve-like texture is commonly observed in monazite that has experienced significant fluid involvement [52].…”

Section: Evidence For Hydrothermal Originmentioning

confidence: 99%

“…We would anticipate higher ThO 2 content in igneous monazite (3 to >5 wt % ThO 2 ) compared to hydrothermal (0-1 wt % ThO 2 ) [50] or authigenic grains (e.g., 0.63 wt % ThO 2 , <0.18 wt % UO 2 ) [52]. Although the bright core in monazite grain 1 (Figure 2A) suggests a different origin from the rest of the grain, its sieve-like texture is commonly observed in monazite that has experienced significant fluid involvement [52]. This core may be the result of secondary alteration, but the oscillatory zoning that parallels its boundaries suggests it may be a primary feature.…”

Section: Evidence For Hydrothermal Originmentioning

confidence: 99%

“…In addition, monazite grains with low U and/or Th are common in rocks that have experienced significant fluid involvement, including authigenic precipitation (e.g., [27,[51][52][53]) or retrograde reactions [54][55][56]. These types of monazites are also found as hydrothermal precipitates [57][58][59] or in carbonatites (e.g., [60][61][62][63]).…”

Section: Evidence For Hydrothermal Originmentioning

confidence: 99%

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Speculations Linking Monazite Compositions to Origin: Llallagua Tin Ore Deposit (Bolivia)

Catlos

Miller

2017

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Monazite [(Ce,Th)PO 4 ] from the Llallagua tin ore deposit in Bolivia is characterized by low radiogenic element contents. Previously reported field evidence and mineral associations suggest the mineral formed via direct precipitation from hydrothermal fluids. Monazite compositions thus may provide insight into characteristics of the fluids from which it formed. Chemical compositions of three Llallagua monazite grains were obtained using Electron Probe Microanalysis (EPMA, n = 64) and laser ablation mass spectrometry (LA-ICP-MS, n = 56). The mineral has higher amounts of U (123 ± 17 ppm) than Th (39 ± 20 ppm) (LA-ICP-MS, ±1σ). Grains have the highest amounts of fluorine ever reported for monazite (0.88 ± 0.10 wt %, EPMA, ±1σ), and F-rich fluids are effective mobilizers of rare earth elements (REEs), Y, and Th. The monazite has high Eu contents and positive Eu anomalies, consistent with formation in a highly-reducing back-arc environment. We speculate that F, Ca, Si and REE may have been supplied via dissolution of pre-existing fluorapatite. Llallagua monazite oscillatory zoning is controlled by an interplay of low (P + Ca + Si + Y) and high atomic number (REE) elements. We suggest monazite compositions provide insight into fluid geochemistry, mineral reactions, and tectonic settings of ore deposits that contain the mineral.

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“…Di daerah Air Gegas, Kabupaten Bangka Selatan daerah potensial logam tanah jarang dikontrol oleh keterdapatan mineral radioaktif yaitu monasit, zirkon, dan senotim [11]. Terdapatnya monasit pada konsentrat dulang merupakan salah satu penanda bahwa di daerah tersebut merupakan daerah potensial logam tanah jarang karena pada umumnya logam tanah jarang berasal terutama dari monasit seperti yang terdapat di daerah Drahany Negara Chechnya [12].…”

Section: Analisis Petrografi Granitunclassified

Identifikasi Keterdapatan Mineral Radioaktif pada Granit Muncung Sebagai Tahap Awal untuk Penilaian Prospek Uranium dan Thorium di Pulau Singkep

Ngadenin

Karunianto

2016

EKSPLORIUM

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ABSTRAKPulau Singkep adalah bagian dari jalur timah Asia Tenggara, yang salah satu litologinya tersusun oleh granit Muncung. Keberadaan granit tersebut memungkinkan adanya cebakan mineral radioaktif yang prospek terhadap uranium dan thorium. Penelitian ini bertujuan untuk mengidentifikasi keterdapatan mineral radioaktif pada granit Muncung sebagai tahap awal untuk penilaian prospek uranium dan thorium di Pulau Singkep. Metoda yang digunakan adalah pengambilan sampel batuan granit, analisis petrografi sampel granit Muncung, analisis kadar uranium dan thorium serta analisis butir sampel konsentrat dulang yang diambil di wilayah granit Muncung. Mineral radioaktif pada granit Muncung adalah monasit dan zirkon sedangkan pada konsentrat dulang adalah monasit, zirkon, dan senotim. Persentase monasit dalam konsentrat dulang adalah 1,1 – 59,53 %, zirkon 0,68 –55,07 % dan senotim 0,39 – 3,54 %. Kadar uranium dalam konsentrat dulang adalah 30 – 1.346 ppm dan kadar thorium 557 – 13.200 ppm. Disimpulkan bahwa daerah di sekitar granit Muncung dianggap cukup prospek uranium dan thorium dan dapat dikembangkan ke tahapan eksplorasi lebih detail. ABSTRACTSingkep Island is part of Southeast Asia tin belt, which is one of the lithologies, composed of granite Muncung. Existence of granite allows formed deposits of radioactive minerals that prospect of the uranium and thorium. This research goal is to identify radioactive minerals occurrences on granit Muncung in the initial stage for prospect assessment of uranium and thorium in Singkep Island. The Methodologies are granite sampling, petrography analysis of Muncung granite samples, uranium and thorium content analysis and grain size analysis of pan concentrate samples. Radioactive minerals in Muncung granite are monazite and zircon, while in pan concentrate they are monazite, zircon, and xenotime. The percentage of monazite, zircon, and xenotime in the pan concentrate are 1.1–59.53 %, 0.68–55.07 %, and 0.3–3.54 % respectively. The uranium and thorium content in the pan concentrate are 30–1,346 ppm and 557–13,200 ppm respectively. It concluded that the area around the Muncung granite considered prospect for uranium and thorium, and possibly developed into more detailed exploration stage.

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Formation of authigenic monazite-(Ce) to monazite-(Nd) from Upper Carboniferous graywackes of the Drahany Upland: Roles of the chemical composition of host rock and burial temperature

Cited by 43 publications

References 60 publications

Multi‐stage metamorphism by progressive accretion of continental blocks, example from the Western Hindu Kush

Multi‐stage metamorphism by progressive accretion of continental blocks, example from the Western Hindu Kush

Speculations Linking Monazite Compositions to Origin: Llallagua Tin Ore Deposit (Bolivia)

Identifikasi Keterdapatan Mineral Radioaktif pada Granit Muncung Sebagai Tahap Awal untuk Penilaian Prospek Uranium dan Thorium di Pulau Singkep

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