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Na2O-K2O-CaO-MgO-SiO2-H2O-HF

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Journal Article

Ultrahigh-temperature crustal anatexis and final cratonization in Eastern Hebei, North China Craton: Insights from ca. 2.46 Ga Taipingzhai enderbites

Xi-Song Zhang, Ming-Guo Zhai, Lei Zhao, Yan-Yan Zhou, Peng Liou
Journal: GSA Bulletin
Published: 13 May 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37319.1
... index (MALI) diagram (modified from Frost et al., 2001; MALI: Na2O + K2O CaO). (C) SiO2 versus Fe* diagram (modified from Frost et al., 2001; Fe*: FeOT/[FeOT + MgO (D) SiO2 versus A/CNK diagram (A/CNK: molar ratio of Al2O3/ [CaO + Na2O + K2O], modi- fied from Frost et al., 2001). (E) A/FM versus C/NK...
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Early Neoarchean geodynamic regime in the North China Craton: Constraints from 2.7 Ga granitoids in the southern Jilin terrane

Jin Liu, Hongxiang Zhang, Richard M. Palin, Zhenghong Liu, Jian Zhang, Changquan Cheng, Xiaoguang Liu, Chen Zhao
Journal: GSA Bulletin
Published: 04 September 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37757.1
... but depletion in K2O, and have Na2O/K2O ratios of 2.44 11.47. In contrast, the mylonitic granodiorites display similar SiO2 (64.3 70.2 wt%) contents, higher Fe2O3T (3.06 4.75 wt%) and MgO (1.02 2.43 wt%) contents, and lower Al2O3 (13.7 14.2 wt%) contents. Moreover, the mylonitic granodiorites are slightly...
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Late Eocene sodic calc-alkaline lamprophyre in Gangdese batholith, southern Tibet: Implications for mantle metasomatism by carbonatitic melt

Guangxu Li, Lingsen Zeng, Li-E Gao, Lilong Yan, Linghao Zhao, Yihong Tian
Journal: GSA Bulletin
Published: 08 August 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37566.1
... 1.98 wt%) with high Na2O/K2O ratios (>2.3 up to 68.1; Fig. 4B). The Langxian lamprophyres have lower K/Al (0.01 0.15) and K/ (K + Na) (0.01 0.23) ratios and are plotted within the field of sodic lamprophyres [K/ Al < 0.80, K/(K + Na) < 0.40; Fig. 4C; Lu et al., 1991]. In the diagram of CaO SiO2/10...
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Geochemical and petrological diversity of a transcrustal magmatic system driven by mushy magma mixing: Insights from the Triassic dike swarms in East Kunlun orogen, northern Tibetan Plateau

Fuhao Xiong, Dongdong Yan, Changqian Ma, Mingcai Hou, Mingchi Wang, Hu Huang, Wei Wang
Journal: GSA Bulletin
Published: 16 May 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37515.1
... Mushy magma mixing in transcrustal magmatic system AB C DE F GH I Figure 4. Rock classification plots of (A) SiO2 versus (Na2O + K2O) (Middlemost, 1994) and (B) K2O versus SiO2 (Peccerillo and Taylor, 1976). (C I) Harker diagrams. K2O (4.68 6.75 wt but low concentrations of MgO (0.12 0.32 wt...
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Experimental determination of tin partitioning between titanite, ilmenite and granitic melts using improved capsule designs

Fangfang Huang, Jintuan Wang, Xiaolin Xiong, Mingdi Gao, Li Li, Chunxia Wei
Published: 22 March 2024
American Mineralogist (2024)
DOI: https://doi.org/10.2138/am-2023-9232
.... httpwww.minsocam.org/ 230 was better than 1% relative for SiO2 and Al2O3, 2% for MgO, FeO, CaO, and K2O, 231 and 5% for TiO2. Because Na loss occurs during EPMA analysis of hydrous glasses, 232 the reported Na2O contents in quench glasses are from the LA-ICP-MS analyses. 233 Trace elements (Sn and other trace elements...
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An enhanced chemical maturation of juvenile arc crust recorded by the Urad Houqi intrusive suite in Langshan arc, Central Asia

Min Liu, Shao-Cong Lai, Shuai Ma, Fang-Yi Zhang, Ren-Zhi Zhu, Yu Zhu, Jiang-Feng Qin, Bo Xu, Hang Yang
Journal: GSA Bulletin
Published: 15 April 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37465.1
... Mg# (55 58), MgO (4.9 6.8 wt K2O (1.7 2.2 wt and K2O/Na2O ratio (0.5 0.8). In contrast, the dioritic enclave, with a SiO2 range of 61.3 65.0 wt%, exhibits low Mg# (29 33) but high K2O content (2.3 3.1 wt%) and K2O/Na2O ratio (0.6 1.1) (Figs. 5A 5C). Despite the identical SiO2 contents, the granitic...
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Metabasites along the amphibolite-granulite facies transition in the Okiep Copper District, South Africa

J.G. Raith, T. Meisel
Published: 01 March 2001
South African Journal of Geology (2001) 104 (1): 77–100.
DOI: https://doi.org/10.2113/104.1.77
... MnO 0.22 0.13 0.20 0.16 0.19 0.17 0.25 0.44 0.21 0.33 MgO 6.70 7.41 9.77 9.68 6.40 6.14 11.10 7.96 13.17 9.32 CaO 9.79 11.78 10.36 9.84 9.44 7.79 8.64 8.45 9.98 9.89 Na2O 3.56 2.92 1.32 2.54 3.58 3.52 2.65 3.82 2.20 3.21 K2O 1.05 1.03 2.84 1.31...
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Evolution of Silurian to Devonian magmatism associated with the Acadian orogenic cycle in eastern and southern Newfoundland Appalachians: Evidence for a three-stage evolution characterized by episodic hinterland- and foreland-directed migration of granitoid magmatism

Chaoyang Wang, Tao Wang, C.R. van Staal, Zengqian Hou, Shoufa Lin
Journal: GSA Bulletin
Published: 22 April 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37336.1
..., respectively. The first group has relatively low SiO2 (55.68 64.50 wt%) and high Al2O3 (15.26 17.17 wt total Fe2O3 (Fe2O3 + FeO/0.8998; 4.50 9.31 wt MgO (1.32 3.60 wt CaO (1.58 5.20 wt and P2O5 (0.25 0.49 wt%) contents (Table S4). All these samples have K-rich compositions, with high K2O/Na2O values (0.9 2.8...
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Ultrahigh-pressure to high-pressure eclogite in Cuban ophiolitic mélange reveals proto-Caribbean spreading ridge subduction

Hui-Chao Rui, Wen-Yong Duan, Jing-Sui Yang, Walter V. Maresch, Hans-Peter Schertl, Peng-Jie Cai, Angélica I. Llanes-Castro, Hong-Ping He
Journal: GSA Bulletin
Published: 16 September 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37647.1
... Technology Co., Ltd. Sr-Nd-Hf isotope measurements were performed on a Neptune Plus multicollector ICP-MS at Nanjing Hongchuang Geological Technology Co., Ltd., using analytical procedures similar to those described by Li et al. (2012). Thermodynamic modeling was carried out in the Na2O-CaO-K2O-FeO-MgO-MnO...
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Transcrustal magmatic system in lamprophyre dyke constructed by multiple magma reservoirs

Xiangsong Wang, Yannan Wang, Min Sun, Guochun Zhao, Keda Cai, Xijun Liu, Zhenglin Li, Yunying Zhang, Fenn Leppard
Published: 21 June 2024
American Mineralogist (2024)
DOI: https://doi.org/10.2138/am-2023-9271
... and Connolly, 2022) in the Na2O-CaO-K2O-FeO-MgO241 Al2O3-SiO2-H2O-TiO2-O2 (NCKFMASHTO) chemical system, using the 242 thermodynamic database from Holland and Powell (2011) (hp622ver.dat). Activity243 composition solution models were as follows: melt [melt (HGP amphibole [cAmph 244 (G clinopyroxene [Cpx (HGP...
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Quaternary volcanism in southeastern Tibetan Plateau: A record of Neo-Tethyan oceanic slab stagnant in the mantle transition zone

Huan Kang, Yongwei Zhao, Xiaoran Zhang, Liyun Zhang, Huiping Zhang, Haibo Zou
Journal: GSA Bulletin
Published: 08 August 2024
GSA Bulletin (2024)
DOI: https://doi.org/10.1130/B37546.1
... intermittently from ca. 1.70 Ma to 0.22 Ma. Whole-Rock Major and Trace Elements All Quaternary alkali basaltic rocks exhibit a sodic character (i.e., Na2O > K2O; Fig. 4) and display moderate SiO2 contents (42.0 51.9 wt with a notable variation in MgO content (4.5 10.8 wt%, mostly >6.0 wt%; Table Figure 4. (A, B...
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Low-temperature crystallization of kumdykolite, a polymorph of albite, during mineral carbonation within fluid inclusions in hornblendite from the Dabie orogen, central China

Long Zhang, Qiang Wang, Haiyang Xian, Xing Ding, Wan-Cai Li, Yiping Yang
Published: 29 May 2024
American Mineralogist (2024)
DOI: https://doi.org/10.2138/am-2023-9169
... No. SiO2 TiO2 Al2O3 FeO MnO MgO CaO Na2O K2O Total 1 42.80 2.38 11.64 11.97 0.08 12.92 12.09 1.89 1.11 96.88 Si Ti Al Fe Mn Mg Ca 6.368 0.266 2.041 1.490 0.010 2.866 1.927 2