An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit, China

Li, Jiankang; Chou, I‐Ming

doi:10.1016/j.gexplo.2015.10.012

Cited by 38 publications

(10 citation statements)

References 27 publications

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“…(2) The occurrence of cristobalite in the CIs indicates that the CIs were entrapped at relatively high temperatures, because cristobalite is stable at high temperatures [37,38] and was formed due to a pressure decrease within the CIs, mainly resulting from crystallization of the zabuyelite [30]. (3) Cristobalite only occurred within the CIs, while the host spodumene grew together with quartz, indicating that the cristobalite was not an accidentally trapped mineral during the formation of the Table 1.…”

Section: Discussionmentioning

confidence: 99%

“…Most CIs with primary features are characterized by euhedral crystals commonly surrounded by an aqueous fluid ( Figures 5(a), 5(b), and 5(e)), while the semieuhedral crystals are attached to the wall of the CI chamber or at the extreme ends of the CI chamber ( Figure 5). Raman spectroscopy showed that these CIs commonly contain cristobalite, which always coexists with zabuyelite (Li 2 CO 3 ) and occasionally with other minerals, including calcite, spodumene, lithiophosphate, and possibly cookeite [30] ( Figure 5). The estimated volume proportion of the total solid phases in the most of the CIs is about 5 to ∼60% ( Figure 5, Table 1).…”

Section: Fluid Inclusions In Number 134 Pegmatite Dikementioning

confidence: 99%

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Homogenization Experiments of Crystal-Rich Inclusions in Spodumene from Jiajika Lithium Deposit, China, under Elevated External Pressures in a Hydrothermal Diamond-Anvil Cell

Chou

2017

Geofluids

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Extensive studies of the crystal-rich inclusions (CIs) hosted in minerals in pegmatite have resulted in substantially different models for the formation mechanism of the pegmatite. In order to evaluate these previously proposed formation mechanisms, the total homogenization processes of CIs hosted in spodumene from the Jiajika pegmatite deposit in Sichuan, China, were observed in situ under external H 2 O pressures in a new type of hydrothermal diamond-anvil cell (HDAC). The CIs in a spodumene chip were loaded in the sample chamber of HDAC with water, such that the CIs were under preset external H 2 O pressures during heating to avoid possible decrepitation. Our in situ observations showed that the crystals within the CIs were dissolved in carbonic-rich aqueous fluid during heating and that cristobalite was usually the first mineral being dissolved, followed by zabuyelite and silicate minerals until their total dissolution at temperatures between 500 and 720 ∘ C. These observations indicated that the minerals within the CIs were daughter minerals crystallized from an entrapped carbonate-and silica-rich aqueous solution and therefore provided useful information for evaluating the formation models of granitic pegmatites.

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Section: Discussionmentioning

confidence: 99%

Section: Fluid Inclusions In Number 134 Pegmatite Dikementioning

confidence: 99%

Homogenization Experiments of Crystal-Rich Inclusions in Spodumene from Jiajika Lithium Deposit, China, under Elevated External Pressures in a Hydrothermal Diamond-Anvil Cell

Chou

2017

Geofluids

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“…The results show the characteristic peaks of cristobalite at 415 cm −1 and zabuyelite (Li 2 CO 3 ) at 96,129,157,191, and 1098 cm −1 (Figs. 6 and 7) (Li and Chou, 2016) after the host mineral spodumene peaks (1075,1022,707,522,393,355,327, and 248 cm −1 ) had been excluded. CO 2 was the main gas in the CO 2 -NaCl-H 2 O fluid inclusions.…”

Section: Laser Raman Analysismentioning

confidence: 99%

“…Crystal-rich fluid inclusions occur widely in rare granite pegmatite deposits, such as the Jiajika lithium deposits (Li et al, 2006;Li and Chou, 2016), the Keeryin lithium deposits in Western Sichuan (Li et al, 2007), the No. 3 pegmatite lithium deposits in Koktokay and Xinjiang (Lu et al, 1996;Zhu et al, 2000), and the Tanco lithiumberyllium deposits in Canada (Anderson et al, 2001).…”

Section: Fluid Inclusion Characteristicsmentioning

confidence: 99%

“…Two types of fluid inclusions in spodumene can be distinguished from the zoned pegmatite (e.g., London, 1984London, , 1986London, , 1995London, , 1996London, , 2018Černý et al, 1991;Lu et al, 1996;Sirbescu and Nabelek, 2003;Rickers et al,2006;Thomas et al, 2005Thomas et al, , 2016Chou, 2016, 2017): (1) crystal-rich fluid inclusions; and (2) CO 2 -NaCl-H 2 O fluid inclusions. With the experimental calibration of the lithium aluminosilicate phase diagram (London, 1984), detailed studies combined the diagram with fluidinclusion data to investigate the P-T conditions and fluid evolution in some pegmatite deposits (London, 1984(London, , 1996Lu et al, 1996;Sirbescu and Nabelek, 2003;Li and Chou, 2016;2017). However, these studies concentrated on the systematics of fluid inclusion populations and the oreforming process rather than on a comprehensive interpretation of fluid evolution.…”

Section: Introductionmentioning

confidence: 99%

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Fluid Characteristics and Evolution of the Zhawulong Granitic Pegmatite Lithium Deposit in the Ganzi‐Songpan Region, Southwestern China

Xiong

Denghong

et al. 2019

Acta Geologica Sinica (Eng)

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The Zhawulong granitic pegmatite lithium deposit is located in the Ganzi-Songpan orogenic belt. Fluid inclusions in spodumene and coexisting quartz were studied to understand the cooling path and evolution of fluid within albite-spodumene pegmatite. There are three distinguishable types of fluid inclusions: crystal-rich, CO 2 -NaCl-H 2 O, and NaCl-H 2 O. At more than 500°C and 350~480 MPa, crystal-rich fluid inclusions were captured during the pegmatitic magma-hydrothermal transition stage, characterized by a dense hydrous alkali borosilicate fluid with a carbonate component. Between 412°C and 278°C, CO 2 -NaCl-H 2 Ofluid inclusions developed in spodumene (I) and quartz (II) with a low salinity (3.3-11.9 wt%NaCl equivalent) and a high volatile content, which represent the boundary between the transition stage and the hydrothermal stage. The subsequentNaCl-H 2 Ofluid inclusions from the hydrothermal stage, between 189°C and 302°C, have a low salinity (1.1-13.9 wt%NaCl equivalent). The various types of fluid inclusions reveal the P-T conditions of pegmatite formation, which marks the transition process from magmatic to hydrothermal. The oreforming fluids from the Zhawulong deposit have many of the same characteristics as those from the Jiajika lithium deposit. The ore-forming fluid provided not only materials for crystallization of rare metal minerals, such as spodumene and beryl, but also the ideal conditions forthe growth of ore minerals. Therefore, this area has favorable conditions for lithium enrichment and excellent prospecting potential.

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Late Triassic lithium pegmatites in Northwest China: A response to continental collision during Paleo‐Tethys Ocean closure

Zhao,

Qin,

Evans

et al. 2024

Geological Journal

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Spodumene‐bearing pegmatite dyke swarms have recently been discovered in the Chaqiabeishan area, at the northeastern margin of the Qinghai‐Tibet Plateau in northwest China. In order to elucidate the connection between the Chaqiabeishan lithium pegmatites and Triassic magmatism and mineralization within the West Kunlun – Songpan ‐Garzê rare‐metal belt, this study presents new columbite‐group mineral and monazite U–Pb dating results, mineral chemistry, monazite in situ Nd isotope analyses and gamma‐ray spectrometric measurements. Magmatism and mineralization at Chaqiabeishan mainly occurred ca. 216 Ma, and the mineralized pegmatites (Mn‐rich columbite‐group minerals, highly evolved monazite compositions and high effective uranium contents in the gamma‐ray survey) were generated from the high degree of the fractional crystallization in a volatile‐rich granitic magma. The source material of the Chaqiabeishan lithium pegmatites (εNd(t) values from −14.4 to −12.8) was more enriched than that of other pegmatite‐type lithium deposits (Jiajika and Bailongshan) in the West Kunlun – Songpan – Garzê rare‐metal belt and is ascribed to melting of ancient crustal materials in the basement. These late‐Triassic mineralizing events were closely related to the collision‐related tectonic setting at the northeastern margin of the Tibetan‐Qinghai Plateau, a product of Paleo‐Tethys Ocean closure.

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An occurrence of metastable cristobalite in spodumene-hosted crystal-rich inclusions from Jiajika pegmatite deposit, China

Cited by 38 publications

References 27 publications

Homogenization Experiments of Crystal-Rich Inclusions in Spodumene from Jiajika Lithium Deposit, China, under Elevated External Pressures in a Hydrothermal Diamond-Anvil Cell

Homogenization Experiments of Crystal-Rich Inclusions in Spodumene from Jiajika Lithium Deposit, China, under Elevated External Pressures in a Hydrothermal Diamond-Anvil Cell

Fluid Characteristics and Evolution of the Zhawulong Granitic Pegmatite Lithium Deposit in the Ganzi‐Songpan Region, Southwestern China

Late Triassic lithium pegmatites in Northwest China: A response to continental collision during Paleo‐Tethys Ocean closure

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