دورية أكاديمية
Open Apatite Sr Isotopic System in Low-Temperature Hydrous Regimes
| العنوان: | Open Apatite Sr Isotopic System in Low-Temperature Hydrous Regimes |
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| المؤلفون: | Cao, Mingjian, Evans, Noreen, Qin, K., Danišík, Martin, Li, G., McInnes, Brent |
| بيانات النشر: | AMER GEOPHYSICAL UNION |
| سنة النشر: | 2019 |
| المجموعة: | Curtin University: espace |
| مصطلحات موضوعية: | Science & Technology, Physical Sciences, Geochemistry & Geophysics, in situ apatite Sr-Nd isotopes, LA-MC-ICPMS, zircon (U-Th), He dating, apatite metasomatic alteration, low-temperature hydrous condition, Baogutu porphyry Cu deposit, PORPHYRY CU DEPOSIT, RARE-EARTH-ELEMENTS, I-TYPE GRANITOIDS, WESTERN JUNGGAR, TRACE-ELEMENT, U-PB, DISSOLUTION-REPRECIPITATION, HYDROTHERMAL TRANSPORT, CHINA CONSTRAINTS, BAOGUTU |
| الوصف: | Single crystal in situ Sr and Nd isotopic analysis of apatite permits more accurate interrogation of a variety of geoscience questions, including provenance, petrogenesis, and ore system evolution. However, the degree to which the apatite Sr and Nd isotopic systems remain closed under extended low-temperature hydrous conditions is not well constrained. Granitoids at the Baogutu deposit in NW China contain veins of low-temperature H2O-rich epistilbite and thus provide an excellent opportunity to evaluate isotopic system integrity under low-temperature hydrous conditions. Apatite from the Late Carboniferous diorite and granodiorite porphyry show variable (87Sr/86Sr)i ratios (0.7042 to 0.7062) but restricted εNd(t) values (+7.0±0.4 and +6.5±0.4, 1σ). The apatite Sr isotope signatures are transitional between whole rock (0.7035) and vein epistilbite (~0.7062), indicating apparent incorporation of radiogenic Sr from the epistilbite-related hydrothermal fluid into the igneous apatite, whereas εNd values closely match those of the whole rock (+6.9±0.2 and +6.5±0.2, 1σ) and epistilbite (+6.2±0.2, 1σ). Obvious metasomatic textures of apatite were revealed by cathodoluminescence images. The 260 to 300°C formation temperatures for earlier quartz-sulfide veins and chlorite alteration and homogenization temperature (~190°C) of fluid inclusions in epistilbite-calcite vein calcite constrain the temperature of the later epistilbite-related hydrothermal fluid to 190 to 260°C. These results indicate that Sr and likely Nd isotopes in apatite are mobile under low-temperature (<300°C) hydrous conditions and implies that Rb-Sr signatures in apatite from hydrothermally altered rocks reveal the presence and characteristics of modifying fluids. |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | unknown |
| اللغة: | English |
| العلاقة: | http://purl.org/au-research/grants/arc/DP160102427Test; http://hdl.handle.net/20.500.11937/90784Test |
| DOI: | 10.1029/2019JB018085 |
| الإتاحة: | https://doi.org/20.500.11937/90784Test https://doi.org/10.1029/2019JB018085Test https://hdl.handle.net/20.500.11937/90784Test |
| رقم الانضمام: | edsbas.303B00AC |
| قاعدة البيانات: | BASE |
| DOI: | 10.1029/2019JB018085 |
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