| 青海滩间山金矿床地质地球化学及成冈机制 |
| 点此下载全文 |
| 引用本文：.2000.Geology, geochemistry and genesis of the Tanjianshan gold deposit, Qinghai Province[J].Mineral Deposits,19(3):211~222 |
| Hits: 2351 |
| Download times: 2268 |
|
| 基金项目:“九五”地矿部科技攻关项目（95-02-005） |
|
| 中文摘要:滩间山金矿床位于柴达木盆地北缘中西段。金矿体产于万洞沟群碳质千枚岩-片岩地层中，受同碰撞造山期构造岩浆活动控制。岩石地球化学特征显示，酸性-偏碱性岩脉中Au与As 同步富集。矿床中成矿元素之间的相关性表明，Au主要来自岩浆热液。稳定同位素组成表明，矿床中的硫、碳、铅以及流体中的水主要来自岩浆。矿床地质特征及同位素地质年代学结果显示，矿床形成于晚华力西期。 |
| 中文关键词:金矿床，地质地球化学，成因机制，青海滩间山 |
| |
| Geology, geochemistry and genesis of the Tanjianshan gold deposit, Qinghai Province |
|
|
| Abstract:The Tanjianshan gold deposit is located in the central and west part of the northern margin of Qaidam basin. Most gold ore-bodies are controlled by structural activity and magmatic intrusion and occur in carbonic phyllite and schist of Wandongou Formation, which is characterized by relatively low and rather constant Au content (X Au= 1.04×10-9 and VAu= 1.76 in the upperpart; XAu= 1.0×10-9 and VAu= 1.75 in the lower part). The plagioclase gram to phyre has comparatively high Au (2.54×10-9 on average) and As (9.65×10-6 on average), being probably the source of gold. The correlation of ore-forming elements of the deposit also implies that most gold cam e from magma. S table isotope constituents of the deposit indicate that sulfur (δ34S= 3‰ ~ 10‰), carbon (δ13CPDB=-12. 9‰ ~ 3.2‰), lead and water of ore-forming fluids were also mostly derived from magma. Besides carbonic phyllite and schist, the host rocks of the deposit are mostly Hercynian intermediate-acid dykes together with a few basic dykes. Plagioclase granitophyre of the Tanjianshan gold deposit has K-Ar ages of 209. 4×l06 ~ 309.87×l06 a, and a Rb-Sr age of 330.03×l06 a. The phyllic diorite has a K-Ar age of 294.29×l06 a, while the altered gramtophyre gold ore has a K-Ar age of 268. 94×l06 a. It is deduced that alteration took place earlier than mineralization in the Tanjianshan gold deposit, and ore-bodies were formed in Late Hercynian period. The Tanjianshan gold deposit is of the mesotherm al altered rock type. |
| keywords:Tanjianshan gold deposit, geology, geochem istry, genesis |
| View Full Text View/Add Comment Download reader |
|
|
|
