| 摘要: |
| 以小盆湖砂金矿床为典型的一系列砂金矿床、矿点在藏北羌塘中部构成一个呈东西向的砂金矿带,笔者1999年首次将其命名为"藏北羌塘小盆湖-拉雄错砂金矿带"。通过对小盆湖砂金矿床基岩地质、地貌、第四纪地质、矿床类型、成因类型、矿体特征、砂金特征的全面介绍及与该带其它砂金矿床、矿点的对比,结合区域地质背景,认为前泥盆系阿木岗群和石炭系中的火山岩层位是主要矿源层。此后若干不同时期的沉积不整合界面,都表征着其下古风化壳、其上底部碎屑岩的含金物聚源区可以直接或经改造就近形成金矿矿床。羌塘中央隆起带及其两侧和东西方向石炭系分布区具有广阔的金矿找矿前景。 |
| 关键词: 砂金 矿床地质 小盆湖 羌塘 藏北 |
| DOI： |
| 附件 |
| 投稿时间：2002-10-30 |
| 基金项目: |
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| Geology of the Xiaopenhu-Laxongco gold placer belt in Qiangtang, northern Xizang |
| JIA Bao-jiang, LIAO Zhong-li |
(1. Chengdu Institute of Geology and Mineral Resources, Chengdu 610082, Sichuan, China;
2. China University of Geosciences, Beijing 100083, China) |
| Abstract: |
| A chain of gold placer deposits or ore spots have been recognized in Qiangtang, northern Xizang, constituting an EW-trending gold placer belt. The present paper deals, in details, with the regional geological settings,bedrock geology, geomorphology, Quaternary geology, and genetic types of ore deposits referenced to the information about other gold placer deposits in northern Xizang. The source rocks consist mostly of the pre-Devonian Amugang Group and Carboniferous volcanic rocks. The unconformities formed during geologic times are characteristic of the accumulation areas of the gold-bearing material bounded by the lower palaeoweathering crust and upper clastic rocks, which may be directly developed and/or reworked in situ into gold deposits. The central uplifts and their flanks and EW-trending Carboniferous strata are believed to be highly prospective. |
| Key words: gold placer geology of ore deposits Xiaopenhu Qiangtang northern Xizang |
