| 王征征,杨延伟,范旭光,刘文斌,阎昆,王丽伟.豫中关庙—大坪地区铝土矿地球化学特征与成矿规律[J].矿产勘查,2019,(5):1082-1092 |
| 豫中关庙—大坪地区铝土矿地球化学特征与成矿规律 |
| Geochemical characteristics andmetallogenic regularityof bauxite deposits inGuanyuan-Daping area, Henan |
| 投稿时间：2018-12-29 |
| DOI： |
| 中文关键词: 铝土矿 地球化学 成矿规律 找矿方向 嵩箕地区 |
| 英文关键词: bauxite, geochemistry,metallogenic law,direction of prospecting, Songji area |
| 基金项目:河南省地质勘察基金资助项目[2015]70号、2017年度省财政地质勘查项目[2017]22号联合资助。 |
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| 中文摘要: |
| 嵩箕地区关庙—大坪一带隐伏铝土矿床形成于华北陆块南缘晚古生代中奥陶统或上寒武统古风化壳上,属典型的古风化壳沉积型铝土矿床；全岩分析显示区内矿石具有高Al低Si的特点,微量元素蛛网图及稀土元素配分图在不同矿段和不同矿石自然类型中均表现为基本一致,高场强元素Ta、Zr、Hf、Th表现为明显富集,而大离子亲石元素Rb、Sr、Ba等则表现较为不稳定,富集及亏损幅度与沉积基底岩性或矿石中铁质含量有关。全矿段矿石轻稀土富集,具明显的Ce正异常和Eu的负异常,重稀土则表现为不同程度亏损。区内第Ⅴ矿段较第Ⅰ、Ⅱ矿段从化学全分析结果来看都有较高的值,明显受沉积基底岩性的影响；矿体空间分布严格受古风壳沉积基底控制,沉积盆地中的岩溶漏斗、溶蚀洼地是良好的聚集场所,对成矿更有利易于形成厚大矿体,表明铝土矿床形成于嵩箕古岛间喀斯特地形发育的湖泊沼泽相的浅水低能还原环境下；在含铝岩系的保存与埋藏状况合适的前提下,已知铝土露头、矿区或煤矿区的中深部为寻找隐伏铝土矿的第二潜力空间。 |
| 英文摘要: |
| The buried bauxite deposit in Guanmiao-Daping area of SongJi area was formed on the late Paleozoic middle ordovician or upper Cambrian ancient weathering crust in the southern margin of north China continental block.Whole rock analysis showed that ore in the area has the characteristics of high Al low Si, spider diagram of trace elements and rare earth element distribution figure in different ore block and natural ore types are characterized by basic consistent, Ta, Zr and Hf, Th high field strength elements characterized by obvious enrichment, and large ion lithophile element Rb, Sr, Ba is relatively unstable, enrichment and losses related to sedimentary basement lithology or iron content in the ore.The ore of the whole ore section is enriched with light rare earth, with obvious Ce positive anomaly and Eu negative anomaly, while the heavy rare earth shows different degrees of loss.In the first Ⅴ ore block is the first Ⅰ, Ⅱ ore block from the chemical analysis results have high value, obviously affected by sedimentary basement lithology;The spatial distribution of ore bodies is strictly controlled by the sedimentary basement of ancient wind crust. Karst funnels and karst erosion depressions in the sedimentary basin are good gathering places, which are more favorable for mineralization and easy to form thick and large ore bodies. It shows that the bauxite deposit was formed in the shallow water and low-energy reduction environment of lake and swamp facies developed in karst topography between songji ancient islands.Under the precondition of proper preservation and burial of aluminum-bearing rock series, the known middle and deep bauxite outcropping, mining area or coal mine area is the second potential space for finding hidden bauxite. |
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