Sodium metasomatism and magnesio-riebeckite mineralization in the Wilson Ridge pluton
- 出版日期：2000.
- 页数：104 p. :
- 第一责任说明：Deborah Ann Potts.
- 分类号：a380 ; a254.2
- ISBN：0599794380(ebk.) :
MARC全文
02h0023315 20110420154624.0 cr un||||||||| 110411s2000 xx ||||f|||d||||||||eng | AAI1399928 0599794380(ebk.) : CNY371.35 NGL NGL NGL a380 ; a254.2 Potts, Deborah Ann. Sodium metasomatism and magnesio-riebeckite mineralization in the Wilson Ridge pluton [electronic resource] / Deborah Ann Potts. 2000. 104 p. : digital, PDF file. Source: Masters Abstracts International, Volume: 38-06, page: 1559. ; Chair: Rodney V. Metcalf. Thesis (M.S.) -- University of Nevada, Las Vegas, 2000. The Wilson Ridge pluton contains a rare occurrence of hydrothermal sodic amphibole. hydrothermal amphibole occurs as fracture coatings, veinlets, dense stockwork-type networks, and diffusive alteration fronts. Electron microprobe analyses of the hydrothermal amphibole reveal a range of Na-rich compositions, most notably magnesio-riebeckite. Magnesio-riebeckite in the Wilson Ridge pluton formed by Na-metasomatism related to subsolidus hydrothermal alteration involving Na-rich fluids of meteoric origin. Whole-rock geochemistry of samples from zones of hydrothermal amphibole show enrichment of Na2O (>9.6 wt. %) and depletion of K2O (0.15 wt. %) and CaO (2.4 wt. %) relative to unaltered host rock. Secondary fluid inclusions associated with zones of hydrothermal amphibole contain daughter crystals of halite and up to three other unknown crystals. Oxygen isotope studies suggest that granitoid rocks containing hydrothermal amphiboles have lower δ18O values (+3.68‰ to +6.97‰) than unaltered granitoid rocks (δ 18O values +6.04‰ to +9.23‰) Metasomatism (Mineralogy) ; Intrusions (Geology) ; Geology Mead, Lake (Ariz. and Nev.) ; Mead, Lake (Ariz. and Nev.) University of Nevada, Las Vegas. aCN bNGL http://168.160.16.198/umi/detail_usmark.jsp?searchword=pub_number%3DAAI1399928&singlesearch=no&channelid=%CF%B8%C0%C0&record=1 NGL Bs168 rCNY371.35 ; h1 bs1104