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| Tracking meteoric infiltration into a magmatic-hydrothermal system: A cathodoluminescence, oxygen isotope and trace element study of quartz from Mt. Leyshon, Australia | |
| Allan, M. M. | |
| 2007 | |
| Source Publication | Chemical Geology
 |
| ISSN | 0009-2541 |
| Volume | 240Issue:42067Pages:343-360 |
| Abstract | The oxygen isotope and trace element composition of hydrothermal quartz has been integrated with scanning electron microscope-cathodoluminescence (SEM-CL) images and fluid inclusion properties to track fluid sources and hydrothermal processes in the Mt. Leyshon An deposit, Australia. Oxygen isotope and trace element data were collected on parallel traverses across the same quartz sections, using secondary isotope mass spectrometry (SIMS) and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS), respectively, with SEM-CL images obtained before analysis for petrographic context. Over the 280 to 650 degrees C quartz precipitation range suggested by fluid inclusion microthermometry, delta O-18(quartz) varies from 0.0 to 14.4%o, corresponding to a wide range of equilibrium delta O-18(fluid) values, from-6.1 to 10.2%o (vs. V-SMOW). The delta O-18(quartz) signature varies systematically among distinct SEM-CL quartz generations (both within and between samples), and can be correlated with variations in temperature and fluid composition, but is independent of intra-generational oscillatory zoning. In contrast, Al and Li concentrations correlate broadly with CL intensity in oscillatory quartz, whereas their concentration is unpredictable in sealed fractures and overgrowths. Concentrations of B, Mg, Na, P, Cl, K, Ti, Mn, Fe, Ge, and Sn are independent of Al, Li, and oscillatory CL features, but Ti correlates with quartz precipitation temperature. Although no systematic correlation between delta O-18(quartz) and trace element concentrations was found, complementary patterns exist in narrow overgrowths of low delta O-18(quartz) (similar to 0%o) and high Al (> 10,000 ppma). These quartz zones likely formed during the incursion of O-18-depleted meteoric water into the magmatically-dominated Mt. Leyshon hydrothermal system. We interpret the highest Al concentrations as the result of high quartz precipitation rates, triggered by depressurisation of the hydrothermal cell. The decoupling of oxygen isotope and trace element patterns in quartz leads to the suggestion that (1) under most circumstances, temperature and fluid chemistry dominate delta O-18(quartz), and (2) the trace element record, and in particular Al and Li, is influenced by the superimposed effects of quartz precipitation rate. (C) 2007 Elsevier B.V. All rights reserved. |
| Document Type | 期刊论文 |
| Identifier | https://ir.xtbg.ac.cn/handle/353005/8463 |
| Collection | 公共技术服务中心主要仪器相关文献_同位素质谱仪 |
| Recommended Citation GB/T 7714 | Allan, M. M.. Tracking meteoric infiltration into a magmatic-hydrothermal system: A cathodoluminescence, oxygen isotope and trace element study of quartz from Mt. Leyshon, Australia[J]. Chemical Geology,2007,240(42067):343-360. |
| APA | Allan, M. M..(2007).Tracking meteoric infiltration into a magmatic-hydrothermal system: A cathodoluminescence, oxygen isotope and trace element study of quartz from Mt. Leyshon, Australia.Chemical Geology,240(42067),343-360. |
| MLA | Allan, M. M.."Tracking meteoric infiltration into a magmatic-hydrothermal system: A cathodoluminescence, oxygen isotope and trace element study of quartz from Mt. Leyshon, Australia".Chemical Geology 240.42067(2007):343-360. |
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