| 辽宁杨木杆硼矿床地质地球化学特征 |
| 点此下载全文 |
| 引用本文：.1998.Geological and geochemical characteristics of the Yangmugan Boron deposit Liaoning Province[J].Mineral Deposits,17(4):355~362 |
| Hits: 2792 |
| Download times: 1777 |
|
| 基金项目:地矿部91年度行业基金（910054） |
|
| 中文摘要:杨木杆硼矿位于辽宁省宽甸县，产出于古元古代南辽河群下部里尔峪岩组中，为一中型硼镁石型硼矿。矿体走向SE，倾向NE，倾角70～80°，直接赋矿岩石为蛇纹岩、蛇纹石化大理岩，矿体顶板出现有热水沉积的电英岩。硼矿石主要由纤维硼镁石、板状硼镁石及蛇纹石、白云石等组成。常见的变余沉积及变质、交代等组构。硼矿石品位B2O3随MgO含量增长先是稳步增长，然后在B2O3含量大于7%时，MgO含量稳定在45%～48%范围内。矿石中富含Cs、Nd、Ta、Sn、Cd等微量元素及F、CH4等挥发分，稀土总量从5.73×l0-6～70.98×10-6，具Eu负异常。δ13C在-2.6‰～-10.4‰，δ11B在9.6‰~11.1 ‰。杨木杆硼矿为受变质的与深源火山活动有关的热水沉积矿床，同时存在的蒸发气候条件提高了硼富集成矿的效率。 |
| 中文关键词:硼矿, 地质地球化学特征, 古元古代, 辽宁杨水杆 |
| |
| Geological and geochemical characteristics of the Yangmugan Boron deposit Liaoning Province |
|
|
| Abstract:Located in Kuandian County, Liaoning Province, the Yangmugan boron deposit is a medium-size szaibelyite type deposit occurring in I.ieryu Formation within the lower part of the Paleoproterozoic South Liaohe Group. Orobodies strike SE, dip NE and have dip angles 70~80°. Host rocks are yellowish green and black serpentinites and serpentinized marble, with thick-bedded hydrothermally-deposited laminar tourmalite also seen in the hanging wall of the orebodies. Ore minerals comprise mainly fibrous and tabular szaibelyite, whereas gangue minerals consist chiefly of serpentine, forsterite, phlogopite and dolomite. Blasto sedimentary, blastic and rnetasomatic textures make up the main ore textures. The ore grade of B2O3 is closely related to the confent of MgO. The ores contain abundant trace elements like Cs, Nd, Ta, Sn and Cd as well as rich volatiles such as F and CH4. The REE content ranges from 5.73×10-6 to 70.98×10-6 and the chondrite-normalized REE patterns have positive or negative slopes and exhibit negative Eu anomalies. δ13C values are -2.6‰～-10.4‰, and δ11B valucs are 9. 6‰～ll. l‰. The Yangmugan boron deposit is of the hydrothermal sedimentation type closely related to mantle derived volcanic activity, and the coexistent evaporate climatic condition raised the efficiency of ore concentration, After its formation, the primary boron deposit underwent regional metamorphism of amphibole facies and two phases of intense deformation during the, Luliang orogeny. |
| keywords:boron dcposit, gcological and gcochcmical charactcristics, Yangmugan, I_iaoning Provincc |
| View Full Text View/Add Comment Download reader |
|
|
|
