Archaean phosphates: a case study of transformation processes in apatite from the Barberton greenstone belt

Birski, Łukasz; Słaby, Ewa; Wirth, Richard; Koch‐Müller, Monika; Simon, Klaus; Wudarska, Alicja; Götze, Jens; Lepland, Aivo; Hofmann, Axel; Kuras, Agnieszka

doi:10.1007/s00410-019-1560-z

Cited by 12 publications

(6 citation statements)

References 83 publications

(160 reference statements)

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“…A total of 11 points of 5 apatite grains in the three polished sections were analyzed, and OH were found in 6 points. The OH is calculated by stoichiometry based on 13 anions 52 , and the range of OH ratios calculated in the three endmembers (F, Cl, OH) is 0–0.38. All the data has been corrected for ZAF (atomic number, X-ray absorption, fluorescence) effect 53 , and the details of the 11 points are shown in Supplementary Table 8 .…”

Section: Methodsmentioning

confidence: 99%

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Liu

Ren

et al. 2022

Nat Commun

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The distribution range, time-varying characteristics, and sources of lunar water are still controversial. Here we show the Chang’E-5 in-situ spectral observations of lunar water under Earth’s magnetosphere shielding and relatively high temperatures. Our results show the hydroxyl contents of lunar soils in Chang’E-5 landing site are with a mean value of 28.5 ppm, which is on the weak end of lunar hydration features. This is consistent with the predictions from remote sensing and ground-based telescopic data. Laboratory analysis of the Chang’E-5 returned samples also provide critical clues to the possible sources of these hydroxyl contents. Much less agglutinate glass contents suggest a weak contribution of solar wind implantation. Besides, the apatite present in the samples can provide hydroxyl contents in the range of 0 to 179 ± 13 ppm, which shows compelling evidence that, the hydroxyl-containing apatite may be an important source for the excess hydroxyl observed at this young mare region.

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Section: Methodsmentioning

confidence: 99%

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Liu

Ren

et al. 2022

Nat Commun

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“…Chemical zonation in apatite grains can be formed by various processes, such as post‐magmatic metasomatism (Harlov, 2015), fractional crystallization (FC) (Bruand et al., 2014), percolating melt‐crystal interaction (Jackson et al., 2018; McKenzie, 1984) and magma mixing (Laurent et al., 2017). Post‐magmatic metasomatism can leach REE from apatite, thus decreasing the apatite REE concentrations (commonly ΣLREE <1,000 ppm) and form varying chondrite‐normalized REE patterns with mildly negative to positive Eu anomalies (Birski et al., 2019; Henrichs et al., 2019; O'Sullivan et al., 2020). Additionally, monazite and xenotime inclusions are often found in metasomatic apatite (Harlov, 2015).…”

Section: Discussionmentioning

confidence: 99%

Apatite Textures, Elemental and Isotopic Compositions Unmask the Homogenizing Process in Silicic Magma Chambers

Xu,

Xia,

Wang

et al. 2024

Geophysical Research Letters

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Silicic magmas are the most viscous of all magmas, however some granitic plutons display remarkably homogeneous compositions, which contradicts the hypothesis that mechanical mixing is the main homogenizing process in the magma chamber. Thus much remains controversial about the mechanisms responsible for the homogeneities of silicic plutons. Here, we present textural observations, elemental mapping, and in situ elemental and Nd‐O isotopic data of apatites from the compositionally homogeneous Late Permian Yuanyang A‐type granitic pluton (SW Yunnan, South China). Apatite grains display oscillatory chemical zonation and resorption‐precipitation texture, suggesting incremental growth dominated by co‐genetic magma batches injection. The intra‐/inter‐grain core to rim elemental and Nd‐O isotopic variations imply crystal transfer and crystallization from different melt domains within the crystal mush. We propose that rejuvenation events associated with hotter cogenetic intermediate magma batch injection has induced crystal mush reactivation and convective stirring in silicic magma chambers, thereby homogenizing the entire reservoir.

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“…Secondary processes may affect either whole crystals or only some of their domains [43,67,68]. Within this context, it was necessary for our isotopic study to determine the textural and structural heterogeneities of crystals, which may be indicators of alteration processes and which may possibly correlate with chlorine isotope compositions [43].…”

Section: Laboratory Methodsmentioning

confidence: 99%

“…Apatite crystals from the Isua rocks are relatively poor in both microinclusions and pores as compared to those from the Archean Barberton (South Africa) and Pilbara (Australia) terrains [67,68]. Apatite crystals from BIF AL4-1 and metachert AL26 contain spherical fluid inclusions with diameters <200 nm (Figure 2a-d).…”

Section: Transmission Electron Microscopymentioning

confidence: 99%

Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland

et al. 2019

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The study of the oldest surviving rock suites is crucial for understanding the processes that shaped the early Earth and formed an environment suitable for life. The metasedimentary and metavolcanic rocks of the early Archean Isua supracrustal belt contain abundant apatite, the geochemical signatures of which may help decipher ancient environmental conditions. However, previous research has shown that secondary processes, including amphibolite-facies metamorphism, have reset the original hydrogen isotope composition (δD) of apatite from the Isua belt; therefore, δD values are not indicative of primary conditions in the Archean. Here, we report the first in situ chlorine isotope (δ 37 Cl) analyses by Secondary Ion Mass Spectrometry (SIMS) from Isua apatite, which we combine with information from transmission electron microscopy, cathodoluminescence imaging, and spectroscopy, documenting the micron-scale internal features of apatite crystals. The determined δ 37 Cl SMOC values (chlorine isotope ratios vs. standard mean ocean chloride) fall within a range from −0.8% to 1.6% , with the most extreme values recorded by two banded iron formation samples. Our results show that δ 37 Cl values cannot uniquely document primary signatures of apatite crystals, but the results are nonetheless helpful for assessing the extent of secondary overprint.Minerals 2020, 10, 27 2 of 25 of evidence, such as putative microbial fabrics and carbon isotope signatures, arguing for traces of biological activity in the Isua rocks [6][7][8][9][10][11][12][13][14][15][16]. The recent study by Dodd et al. [17], in which variably 13 C-depleted graphitic carbon was identified in world-wide occurring banded iron formations, suggests Minerals 2020, 10, 27 21 of 25 materials by GS-IRMS. We would like to thank the editorial team and the reviewers for their suggestions and comments, which helped us to improve the quality of the manuscript. Conflicts of Interest:The authors declare no conflict of interest.

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Archaean phosphates: a case study of transformation processes in apatite from the Barberton greenstone belt

Cited by 12 publications

References 83 publications

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Evidence of water on the lunar surface from Chang’E-5 in-situ spectra and returned samples

Apatite Textures, Elemental and Isotopic Compositions Unmask the Homogenizing Process in Silicic Magma Chambers

Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland

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