Addition of H2O at the Baishiquan and Tianyu magmatic Ni-Cu sulfide deposits, southern Central Asian Orogenic Belt, China: evidence from isotopic geochemistry of olivine and zircon

Tang, Dongmei; Qin, Kezhang; Su, Ben‐Xun; Mao, Yajing; Evans, Noreen J.; Fang, Linru

doi:10.1007/s00126-021-01063-2

Cited by 6 publications

(4 citation statements)

References 130 publications

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“…The Tianyu deposit contains 0.083 Mt of Ni and 0.013 Mt of Cu in reserve, grading 0.61 wt.% Ni and 0.35 wt.% Cu on average. 30 The major rock units in Tianyu mafic-ultramafic intrusion are lherzolite, olivine websterite, gabbro, and diorite, while the principal sulfide minerals of disseminated and net-textured (massive) ores are found in the interstices of ultramafic rocks.…”

Section: Sample and Methodsmentioning

confidence: 99%

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Mineralogical And Geochemical Characterization At A Micro-Scale Of A New Natural Chalcopyrite Reference Material For In-Situ Fe Isotopic Ratio Analysis

Chen¹

2022

At.Spectrosc.

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Chalcopyrite is a widely distributed Fe sulfide in magmatic and magmatic-hydrothermal systems. Stable Fe isotope analysis of Fe-bearing sulfides has been proven to be a powerful tool for tracking the evolution of these deposits and analyzing their mineralization mechanisms. Previous geological studies using multi-collector inductively coupled plasma mass spectrometry (MC-ICP-MS), which makes it challenging to determine the Fe isotopic values of small or structurally complex chalcopyrite, have shown that the  56 Fe values of chalcopyrite fall within a wide range (~4‰). In-situ Fe isotope analysis using laser ablation MC-ICP-MS (LA-MC-ICP-MS) and secondary ion mass spectrometry (SIMS), featuring high precision and spatial resolution, can effectively compensate for the above deficiencies. However, the accuracy of in-situ techniques is mainly controlled by matrix-matched reference materials (RMs). To change the present situation in which there is no ideal natural chalcopyrite RMs for Fe isotopic ratio determination, we evaluated the feasibility of natural chalcopyrite (Tianyu-Ccp) collected from the Tianyu magmatic Ni-Cu sulfide deposit (China) as the RM for in-situ Fe isotopic microanalysis. The Tianyu-Ccp chalcopyrite is homogeneous in terms of major elements and Fe isotopic compositions. For in-situ microanalysis, the standard deviation of the Fe isotopic composition is 0.19‰ (2 SD, n = 86) for  56 Fe value. The best recommended Fe isotopic composition, measured by solution MC-ICP-MS, is a  56 Fe value of 0.39 ± 0.07‰ (2 SD, n = 4), based on four different chalcopyrite grains. Therefore, we propose Tianyu-Ccp chalcopyrite as a potential natural RM for in-situ Fe isotopic ratio analysis and expect it to be used for further tracing the formation and evolution of sulfide deposits.

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Section: Sample and Methodsmentioning

confidence: 99%

“…3C), which were placed in epoxy mounts. 30,48 ). Inset shows the location of the study area in Central Asia Orogenic Belt.…”

Section: Sample and Methodsmentioning

confidence: 99%

Mineralogical And Geochemical Characterization At A Micro-Scale Of A New Natural Chalcopyrite Reference Material For In-Situ Fe Isotopic Ratio Analysis

Chen¹

2022

At.Spectrosc.

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“…The Tianyu deposit contains 0.083 Mt Ni and 0.013 Mt Cu in reserves, grading 0.61 wt% Ni and 0.35 wt% Cu. 69 The ore-host rocks are olivine websterite and lherzolite, typical of all ultramafic rocks with Ni–Cu sulfide mineralization. Two principal types of sulfide mineralization occur in this deposit: disseminated ores and net-textured (+massive) ores.…”

Section: Sample Description and Preparationmentioning

confidence: 99%

Tianyu-Py pyrite: a new natural reference material for micro-beam determination of iron isotopic ratios

Chen

Feng

et al. 2022

J. Anal. At. Spectrom.

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“…Many of these complexes exhibit Ni-Cu-(PGE) sulfide mineralization (Figure 1b; [7,13,16,17]). Although previous studies have investigated their ages, petrogenesis, tectonic settings, and mineralization mechanisms [13,[18][19][20], the geodynamic setting of these mafic-ultramafic rocks remains controversial. Some researchers have proposed that they were generated by either oblique subduction or ridge subduction [10,13,18,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

The Late Carboniferous Mafic–Ultramafic Complex Induced by Slab Breakoff in Eastern North Tianshan, Central Asian Orogenic Belt

Gao,

Cheng,

Guo

et al. 2023

Minerals

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The Late Carboniferous to Early Permian is a critical period of the Chinese Tianshan, witnessing the tectonic transition from subduction to post-collisional extension during the final amalgamation of the Central Asian Orogenic Belt (CAOB). The late Carboniferous Mozbaysay mafic–ultramafic complex in the Qijiaojing–Balikun area, eastern North Tianshan, provides important clues for revealing the nature and timing of this tectonic transition. The Mozbaysay complex comprises mainly hornblende gabbros and lherzolites. LA-ICP-MS U-Pb zircon ages of hornblende gabbro yielded a weighted mean age of 306 ± 1.9 Ma for this complex. These mafic–ultramafic rocks have high contents of MgO (up to 30 wt.%), Cr (up to 2493 ppm), and Ni (up to 1041 ppm), but low contents of SiO2 (40.34–47.70 wt.%). They are enriched in LREE and show characteristics of enriched mid-ocean ridge basalts (E-MORB). The relatively high Th/Yb and Ba/Nb ratios imply the mantle sources could have been metasomatized by slab–mantle interaction with aqueous fluids from dehydration of the subducted slab. Thus, these mafic–ultramafic rocks were most likely produced by partial melting of the asthenospheric and lithospheric mantle with a slight influence of slab-derived fluids. Therefore, we suggest that the formation of these Late Carboniferous mafic–ultramafic rocks was triggered by the decompression-induced influx of asthenospheric heat and melting through a slab window during post-collisional slab breakoff. Combined with geological data, the petrogenetic links of the Late Carboniferous mafic–ultramafic rocks in eastern North Tianshan to slab breakoff suggest that the tectonic transition from convergence to post-collision most likely initiated in situ at ca. 306 Ma and lasted to ca. 300 Ma.

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Addition of H2O at the Baishiquan and Tianyu magmatic Ni-Cu sulfide deposits, southern Central Asian Orogenic Belt, China: evidence from isotopic geochemistry of olivine and zircon

Cited by 6 publications

References 130 publications

Mineralogical And Geochemical Characterization At A Micro-Scale Of A New Natural Chalcopyrite Reference Material For In-Situ Fe Isotopic Ratio Analysis

Mineralogical And Geochemical Characterization At A Micro-Scale Of A New Natural Chalcopyrite Reference Material For In-Situ Fe Isotopic Ratio Analysis

Tianyu-Py pyrite: a new natural reference material for micro-beam determination of iron isotopic ratios

The Late Carboniferous Mafic–Ultramafic Complex Induced by Slab Breakoff in Eastern North Tianshan, Central Asian Orogenic Belt

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