| 河北宽城峪耳崖金矿床地质地球化学特征及成矿物质来源 |
| 点此下载全文 |
| 引用本文：.1994.Geological-geochemical characteristics and material sources for mineralization of the Yuerya gold deposit in Kuangcheng County, Hebei Province[J].Mineral Deposits,13(2):137~147 |
| Hits: 2558 |
| Download times: 1849 |
|
| 基金项目:国家自然科学基金资助 |
|
| 中文摘要:峪耳崖金矿是冀东地区与中生代花岗岩有关的金矿床的典型代表。其成矿岩体具有明显的陆壳改造型花岗岩特征，成矿热液富CO2并具有较高的K+、Ca2+、Cl-和HC03-含量，成矿温度集中于280～330℃，压力变化于111.4～30.4 MPa，成矿流体以岩浆水为主导，成矿热液及成矿物质，主要来自岩浆体系。 |
| 中文关键词:改造型花岗岩 流体包裹体 同位素组成 峪耳崖金矿 河北宽城 |
| |
| Geological-geochemical characteristics and material sources for mineralization of the Yuerya gold deposit in Kuangcheng County, Hebei Province |
|
|
| Abstract:The Yuerya gold deposit located in Kuangcheng county is a typical deposit related to Mesozoic granite of eastern Hebei. Mineralogical, petrological and geochemical investigations indicate that the ore-bearing granite should be classifted as the transformation type (i.e. S-type) granitoid. The main evidence for this conclusion is as follows: (1) the euhedral aluminium-rich mineral partschinite was found in the granite; (2) biotite in the granite is lepidomelane rich in iron but depleted in magnesium; (3) the granite is rich in silica, alkali, LILE and LREE, and shows medium to strong negative europium anomalies (δEu=0.26～0.53); (4) the granite is enriched in δ18O(δ18O =10.49‰～11.56‰). Fluid inclusion studies indicate that the ore-forming fluids are rich in CO2, and have higher K+，Ca2+，Cl- and HCO3- contents. The ore-forming temperatures are mainly in the range of 280℃ to 330℃, whereas the pressure during the ore-forming stage vary from 111.4 MPa to 30.4 MPa. The salinities of hydrothermal fluids have an important effect on mineralization. Stable isotope investigations show that in the ore-forming fluids,δ18O =3.06‰～7.85‰, δD=82‰-87‰, δ13C=-5.82‰～7.85‰, δ34S∑S=+3.1‰, and the lead isotopic composition of ores approximates to that of feldspar from granite.These data suggest that the ore-orming fluids might have been composed mainly of magmatic water, and the ore-forming fluids and materials must have originated chiefly from the magmatic system. |
| keywords:transformation type granite, fluid inclusion, isotope composition, Yuerya gold deposit, Kuangcheng, Hebei Province |
| View Full Text View/Add Comment Download reader |
|
|
|
