Discovery of Sedimentary Tuff with Iron Mineralization in the Permian Strata of the Kaixinling Area and Its Ore-Search Implications
详细信息
- 责任者：Zhao Zhenming (Xi’an Institute of Geology and Mineral Resources ; Xi’an 710054 ; China) ; Chen Shoujian
- 刊名：Geology and Prospecting
- 出版年：2013
- 卷期：49(3)
- 关键词：铁矿 ; iron ores ; 凝灰岩 ; tuff ; 青藏高原 ; Qinghai-Tibetan Plateau
- 页码：p.417-428
- 图表：illus., 3 tables, 20 refs.
- 分类号：1001
- issnNo：ISSN0495-5331
- isbnNo：CN11-2043/P
摘要
The Kaixinling area is located in northern Qiangtang tectonic area of the Tibetan Plateau. In the Permian strata of this area, we recently newly found gravel-containing sedimentary tuff with iron mineralization and conglomerate with crystallinoclatic and debris, and conducted lab tests on the samples collected from the strata. Observations under microscopes suggest that, the samples contains basaltic and tuff debris, and the crystal fragments are mainly quartz and feldspar. The TFe conten is 13.80% by chemical analysis; hematite 6%, goethite 17%, quartz 16%, plagioclase 47%, illite 3%, calcite 6%, amphibole 2%, chlorite 2% by X ray diffraction analysis. The Ti content is 0.7% by half-quantitative spectral analysis. Electron probe backscattering analysis results show that the hematite crystalloid exhibits completed or uncompleted geometric shapes, and the close or unclose fabric belts along the brim of other mineral crystalloid. Ilmenite displays full stick shape. Apatite has hexagon or semicircular appearance. Laser-Raman spectrum analysis results show that, the samples contain goethite and magnetite. It is suggested that maybe there was an important magmatic eruption in the Kaixinling area in the Permian period, and the primitive magma bears high content of the element Fe, which is probably the source of the metal ore deposits in this region. Exploration work of this area should be strengthened in the future.
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