Magmatic chlorine isotope fractionation recorded in apatite from Chang'e-5 basalts

Ji, Jianglong; He, Huicun; Hu, Sen; Lin, Yangting; Hui, Hejiu; Hao, Jialong; Li, Ruiying; Yang, Wei; Yan, Yihong; Tian, Heng‐Ci; Zhang, Chi; Anand, M.; Tartèse, Romain; Gu, Lixin; Li, Jinhua; Zhang, Di; Mao, Qian; Jia, Lihui; Chen, Yi; Wu, Shitou; Wang, Hao; He, Huaiyu; Li, Xian‐Hua; Wu, Fu‐Yuan

doi:10.1016/j.epsl.2022.117636

Cited by 20 publications

(9 citation statements)

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“…Lunar mare basalts are characterized by decreasing in Mg content in bulk rock composition, from the early stage magma that was rich in Mg to the last stage magmas that was mostly enriched in Fe (Zhang et al., 2022). For example, in olivine and pyroxene, the Mg value decreased from the earlier stage in which mainly crystallized forsterite, augite, and clinopyroxene to the late stages mostly composed by Fe‐rich fayalite with mesostasis and pigeonite (Jiang et al., 2021; Ji et al., 2022; Zhang et al., 2022; Wang et al., 2015). The major phases presented in the clast are anorthite (plagioclase), pigeonite (pyroxene), fayalite (olivine), and ilmenite.…”

Section: Discussionmentioning

confidence: 99%

Compositional Variability of 2.0‐Ga Lunar Basalts at the Chang'e‐5 Landing Site

et al. 2023

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The primordial Moon experienced the solidification of early magma ocean and later partial melting of the lunar primordial mantle that produced the mare basalts (Head & Wilson, 2020;Warren, 1985;Zhang et al., 2022). The six Apollo and three Luna missions returned a total of 383 kg of lunar samples, including basalts, which offer direct insights into the chronology and evolution of primordial lunar mare volcanism. Lunar mare basalts are used to reconstruct the thermochemical history of the Moon because the formation of lunar mare basalts is considered to be connected with mantle differentiation (Shearer & Papike, 1999;Wieczorek et al., 2006). Lunar mare basalts display a wider compositional range compared with terrestrial basalts, especially in TiO 2 content (0.3-∼15 wt%)

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Section: Discussionmentioning

confidence: 99%

Compositional Variability of 2.0‐Ga Lunar Basalts at the Chang'e‐5 Landing Site

et al. 2023

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“…Compared to the Naitoushan basalt, the Heishigou dike apatite has higher F and lower Al 2 O 3 contents. The Cl contents in the apatites of CBS-12a and CBS-8a (Table4) are equivalent to those in the high-Ti basalt of the Moon(Ji et al, 2022).…”

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confidence: 91%

Geochemistry of apatites from pre–shield and post–shield basalts and their petrogenetic implications: A case study of the Naitoushan basalt and Heishigou dike in the Changbaishan Tianchi volcano, NE China

Sun

et al. 2023

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This study analyzes apatite via laser ablation multicollector inductively coupled plasma mass spectrometry (LA–MC–ICP–MS) and zircon via LA–ICP–MS to collect U–Pb geochronological data, alkaline feldspar and plagioclase via Rb–Sr isotope chronology and an apatite geochemistry archive for exposed Naitoushan basalt and Heishigou dike in the Changbaishan Tianchi volcano (CTV). These data are used to examine their petrogenesis and to determine the basaltic magmatism origin in CTV. The Naitoushan basalt and Heishigou dike were formed at 22.2–18.7 and 0.230–0.218 Ma, respectively. In situ oxide, volatiles, trace element geochemistry and Sr–Nd isotopes of apatite are provided for two samples. Most apatites occur as an early crystallizing phase forming inclusions in plagioclase and are euhedral or subhedral. They have higher MgO and K2O/Na2O concentrations with lower F and Cl concentrations, Ba, Sr, Nb, Ta, Zr, Hf, K, and Ti depletions, and Th, U, Ce, Pb, P, and Nd enrichments. All apatite samples have enrichment in light rare earth elements (REEs) relative to heavy REEs and relatively homogeneous ratios of Th/U, Zr/Hf, La/Sm, Nd/Tb and Sr–Nd isotopic compositions; thus, their host magmas potentially have the same magmatic origin as oceanic island basalt. The La, Yb, and U contents, the Eu/Eu* and La/Yb values, and the high REE contents in the apatites show a weak crystallization sequence in mafic magma. Combined with previous whole-rock geochemical data, apatite trace element and REE patterns and compositional variations in the rocks are controlled by the crystallization of olivine, pyroxene, plagioclase, and cocrystallizing accessory minerals. This study demonstrates that the pre–shield and post–shield mafic magmas in the CTV were likely derived from an enriched mantle source with a signature of enriched mantle I-type.

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“…However, developing these insights is hampered by large uncertainties in the bulk compositions of the Chang’E-5 basalt clasts, ,− due to their complex microtextures and small grain sizes. Since the bulk composition of lunar basalt is central to understanding lunar mantle reservoirs, melting P–T conditions, and postmelting processes, − accurate and precise bulk compositions of the basalt clasts are essential for revealing the petrogenesis of mare basalt and lunar thermal evolution. ,, …”

Section: Introductionmentioning

confidence: 99%

“…Since the bulk composition of lunar basalt is central to understanding lunar mantle reservoirs, melting P−T conditions, and postmelting processes, 9−11 accurate and precise bulk compositions of the basalt clasts are essential for revealing the petrogenesis of mare basalt and lunar thermal evolution. 4,5,12 Conventional analytical techniques, such as wet chemical analysis, 13 X-ray fluorescence (XRF), 14 inductively coupled plasma mass spectrometry (ICP-MS), 15 and inductively coupled plasma optical emission spectrometry (ICP-OES), 16 are destructive and thus are unsuitable for precious lunar soil samples. An alternative, modal recombination (Figure 1), is the most widely used method to calculate the bulk composition of lunar samples based on mineral volume fraction, average mineral composition, and density of each mineral phase.…”

Section: ■ Introductionmentioning

confidence: 99%

Automatic Bulk Composition Analysis of Lunar Basalts: Novel Big-Data Algorithm for Energy-Dispersive X-ray Spectroscopy

Yuan

Huang

Chen

et al. 2023

ACS Earth Space Chem.

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The bulk composition of lunar basaltic meteorites and clasts provides crucial information for understanding their petrogenesis and thus lunar thermal evolution. Meanwhile, the basalt type of Chang’E-5 based on the bulk TiO2 contents remains debatable. Modal recombination based on mineral volume fraction, densities, and average compositions is currently the most popular method to determine the bulk composition of lunar samples. Yet, the latter two parameters can be biased markedly by ubiquitous compositional variations in pyroxene, olivine, and plagioclase. To rectify these issues and provide more accurate classifications, this study devises a novel big-data algorithm that analyzes maps of energy-dispersive X-ray spectroscopy (EDS) data of lunar basalts. The algorithm starts by labeling each point through a newly devised mineral classifier, then uses the mean of all points per mineral to represent average composition, and finally recalculates the true density per mineral to replace standard density. The accuracy of this mineral classifier is demonstrated by tests on a database of lunar minerals. The accuracy and precision of EDS mapping were verified by test analysis on certified reference minerals. Measurements on a lunar meteorite sample with a known composition, NWA 4734, are comparable to those measured using inductively coupled plasma optical emission spectrometry and confirm the reliability of the bulk composition algorithm. To demonstrate its utility for comprehensive understanding of petrographic features, the high-efficiency algorithm was applied to Chang’E-5 basalts. The results reveal that these basalts are characterized by low-Ti and low-Mg features, thus distinct from previous Apollo and Luna samples.

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Magmatic chlorine isotope fractionation recorded in apatite from Chang'e-5 basalts

Cited by 20 publications

References 69 publications

Compositional Variability of 2.0‐Ga Lunar Basalts at the Chang'e‐5 Landing Site

Compositional Variability of 2.0‐Ga Lunar Basalts at the Chang'e‐5 Landing Site

Geochemistry of apatites from pre–shield and post–shield basalts and their petrogenetic implications: A case study of the Naitoushan basalt and Heishigou dike in the Changbaishan Tianchi volcano, NE China

Automatic Bulk Composition Analysis of Lunar Basalts: Novel Big-Data Algorithm for Energy-Dispersive X-ray Spectroscopy

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