...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Primary magmatic biotite in granitoid intrusions associated with Late Mesozoic Jinchanggouliang-Erdaogou lode gold deposits, North China Craton: Linkage to gold mineralization
【24h】

Primary magmatic biotite in granitoid intrusions associated with Late Mesozoic Jinchanggouliang-Erdaogou lode gold deposits, North China Craton: Linkage to gold mineralization

机译：初级岩岩生物仪在沉积侵犯中侵犯中的侵入性与中生代后期相关的侵入性，华北牧师德国·克拉顿·克拉顿：与金矿化联系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Late Mesozoic Jinchanggouliang and Erdaogou lode gold deposits in the central segment of the northern North China Craton are mainly hosted in Late Archaean metamorphic rocks of the Jianping Formation and Jurassic volcanic-sedimentary rocks. These deposits are spatially and temporally associated with a series of I-type granitoid intrusions: i.e., the 128-136 Ma Duimiangou granodiorite complex with a massive margin and a porphyritic center at Jinchanggouliang, the 161.4 +/- 1.1 Ma Loushang quartz diorite intrusion and numerous syenite porphyry dykes (160.9 +/- 1.0 Ma) at Erdaogou, and the similar to 227-217 Ma Xitaizi monzogranite batholith. Compositions of primary magmatic biotite in these granitoid intrusions have been used to investigate the nature of granitoid magmas and the evolution of magmatic processes and to identify possible linkages between gold mineralization and granitoid magmatism. All primary magmatic biotite grains are Mg-rich in composition (X-Mg = Mg/(Mg + Fe) = 0.41-0.69). The Cl contents of biotite (0.09-0.42 wt%) in the Loushang quartz diorite and the Duimiangou massive granodiorite correlate negatively with X-Mg and are consistent with the "Mg-Cl avoidance" rule. The Cl contents of biotite (0.01-0.14 wt%) in the Duimiangou porphyritic granodiorite, syenite porphyry and Xitaizi monzogranite, on the other hand, remain relatively constant and may be affected by multiple variables such as Cl-rich fluids and subtle changes in temperature. Halogen fugacity of the parental magma calculated from biotite shows that the Duimiangou granodiorite complex at Jinchanggouliang and syenite porphyry dykes at Erdaogou have the log(fHF/fHCl) ranges of -0.71 to -0.27 and -2.16 to -1.08, respectively, and have similar log(fH(2)O)/(fHCl) values from 3.53 to 4.23. Oxygen fugacities (logfO(2)) calculated from biotite equilibria for the Duimiangou granodiorite complex and syenite porphyry dykes are -13.7 to -7.2, straddling on the nickel-nickel oxide and hematite-magnetite buffers. The Xitaizi monzogranite and the Loushang quartz diorite have lower log(fO(2)) values from -14.9 to -12.4, between the nickel-nickel oxide and hematite-magnetite buffers. The Duimiangou granodiorite complex and syenite porphyry dykes with high oxygen fugacities are similar to oxidized magmas associated with porphyry Cu-Mo-Au deposits. These results suggest that multiple episodes of I-type granitoid magmas in the study area were rich in Cl and high in oxygen fugacity, especially those associated with the Duimiangou granodiorite complex and syenite porphyry dykes. The I-type melts represented by the Duimiangou granodiorite complex and syenite porphyry dykes as well as their related Cl-rich, oxidizing fluids were likely efficient in dissolving, transporting and precipitating gold for the formation of the Jinchanggouliang and Erdaogou lode gold deposits.
机译：北方北部北部的中小学金昌良和Erdaogou Lode Gold Pockits主要托管了建时期的建筑形成和侏罗纪火山沉积岩石的延迟古代变质岩。这些沉积物在空间上和时间上与一系列I型花岗岩入侵有关：即，128-136 ma Duimiangou Granodiorite复合物，锦昌良的巨大边缘和卟啉中心，161.4 +/- 1.1马虎石石英侵入和在Erdaogou的许多Syenite斑岩堤（160.9 +/- 1.0 mA），类似于227-217马Xitaizi Monzogranite Bainolith。这些沉积侵入侵入中的原发性岩浆生物壳的组成已用于研究花岗岩岩浆的性质和岩浆方法的演变，并识别金矿化和花岗岩岩浆之间可能的键。所有初级岩岩生物素晶粒富含含量的组合物（X-Mg = Mg /（Mg + Fe）= 0.41-0.69）。 LOUSHANG石英山岩中的BIOTITE（0.09-0.42重量％）的CL含量和Duimiangou大规模Granodiorite与X-Mg负相关，并与“Mg-Cl避免”规则一致。另一方面，Duimiangou Porphyitic Granodiorite，Syenite卟啉和Xitaizi Monzogranite的Biotite（0.01-0.14wt％）的Cl含量保持相对恒定，并且可能受到多个变量的影响，例如Cl-富含液体和温度细微变化。来自Biotite计算的父母岩浆的卤素不足表明，在Erdaogou的Jinchanggouliang和Syenite斑岩Dykes的Duimiangou Granodiorite复合物分别具有-0.71至-0.27和-2.16至-1.08的日志（fhf / fhcl）范围，并且具有类似的从3.53到4.23的日志（fh（2）o）/（fhcl）值。由Duimiangou Granodiorite复合物和Syenite斑岩斑块的Biotite均衡计算的氧气逃逸率（LOGFO（2））为-13.7至-7.2，跨越镍氧化镍和赤铁矿 - 磁铁矿缓冲液的跨界。 Xitaizi Monzogranite和Loushang石英二极管在镍镍氧化物和赤铁矿 - 磁铁矿缓冲液之间具有较低的对数（FO（2））值-14.9至-12.4。具有高氧气度假率的Duimiangou Granodiorite复合物和Syenite斑岩堤和与斑氏铜钼矿沉积物相关的氧化岩浆。这些结果表明，研究区域I型花岗岩岩浆的多集发作富含CL和高氧气不足，尤其是与Duimiangou Granodiorite复合物和Syenite斑岩堤相关的那些。由Duimiangou Granodiorite复合物和Syenite斑岩堤代表的I型熔体以及它们相关的Cl-Rich，氧化流体可能有效地溶解，运输和沉淀黄金以形成金昌良和Erdaogou Lode金沉积物。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号