贵州西部二叠系峨眉山玄武岩顶部古风化壳钪-铌-稀土矿化富集层的发现与意义
Discovery and significance of the Sc-Nb-REE-enriched zone in the paleocrust of weathering atop the Permian Emeishan basalt in the western Guizhou, China
查看参考文献61篇
|
文摘
|
二叠系峨眉山玄武岩顶部与上覆龙潭组不整合面广泛发育区域性古风化壳,该类古风化壳在川滇黔地区广泛分布,具有产出层位稳定,厚度大,多元素富集特点。目前,总体上对该类古风化壳的成矿和资源潜力研究程度不高,本次在水城-纳雍地区开展系统的岩石地球化学调查发现该层位具有明显的钪、铌、稀土矿化。矿化富集层中w(Sc2O3)介于40×10~(-6)~133×10~(-6),平均73×10~(-6),w(Nb_2O_5)介于30×10~(-6)~392×10~(-6),平均229×10~(-6), w(ΣRE2O3)介于0.052%~0.214%,平均0.093%。钪、铌、稀土具有较明显的“分异”和“分层”富集特征,钪主要富集于中下部含铁质粘土岩系,形成于弱还原环境,铌、稀土主要富集于上部铝质、碳质粘土岩系,形成于氧化-还原转换环境,稀土元素为LREE富集型,在含碳质粘土岩、碳质页岩中富集程度最高,暗示有机质在稀土元素的迁移、富集过程中可能起到了重要的介质作用。稀土配分、La/Yb-ΣREE图解及Eu异常特征指示物源主要为峨眉山玄武岩,可能有少量中酸性火成岩的贡献。本文研究表明川滇黔地区的这类古风化壳中的钪、铌、稀土具有较大的资源潜力,未来有望成为古风化壳型(古风化-沉积型)钪、铌、稀土矿床的重要产出层,具有巨大的勘查、评价及综合研究价值。 |
|
其他语种文摘
|
The palaeocrust of weathering, widely developed within the unconformity between the Permian Emeishan basalt and the Longtan Formation in the Sichuan-Yunnan-Guizhou area, is characterized by stable layer, large thickness, and multi-elemental enrichments. However, very few studies have been carried out on its mineralization and resource potential. In this paper, it has been found that there are obvious Sc, Nb and REE enrichments in the palaeocrust of the Shuicheng-Nayong area based on the systematic petrogeochemical investigation. Samples of the enrichment layer have Sc2O3 contents ranging from 40×10~(-6) to 133×10~(-6), with an average of 73×10~(-6), Nb_2O_5 contents ranging from 30×10~(-6) to 392×10~(-6), with an average of 229×10~(-6), ΣRE2O3 contents ranging from 0.052% to 0.214%, with an average of 0.093%. The Sc, Nb and REE enrichments show obvious characteristics of differentiation and stratification. The Sc enrichment mainly occurred in iron-bearing claystones in the middle and lower parts of the palaeocrustunder a weakly reduced environment. The Nb and REE enrichments occurred mainly in aluminous and carbonaceous claystones in upper part of the palaeocrust under a transition environment from oxidation to reduction. The LREE-enriched patterns and the highest REE enrichment in carbonaceous claystone and carbonaceous shale indicate that organic matter may have played an important role in processes of the migration and enrichment of REE elements. REE distribution patterns, La/Yb-ΣREE diagram and δEu characteristics indicate that REE could be mainly sourced from Emeishan basalts with possibly minor contribution from intermediate-acidic igneous rocks. This study shows that these paleocrusts of weathering in the Sichuan-Yunnan-Guizhou area may have relatively large resource potential of Sc, Nd and REE and could become important layers of the palaeocrust-type (palaeoweathering-sedimentary type) Sc, Nb, and REE deposit in future with great values of exploration, evaluation, and research. |
|
来源
|
矿物学报
,2021,41(4/5):531-547 【核心库】
|
|
DOI
|
10.16461/j.cnki.1000-4734.2021.41.089
|
|
关键词
|
钪-铌-稀土
;
峨眉山玄武岩
;
古风化壳
;
贵州西部
|
|
地址
|
1.
贵州省有色金属和核工业地质勘查局地质矿产勘查院, 贵州, 贵阳, 550005
2.
贵州省有色金属和核工业地质勘查局, 贵州, 贵阳, 550005
3.
贵州省土地矿产资源储备局, 贵州, 贵阳, 550005
4.
中国科学院地球化学研究所, 矿床地球化学国家重点实验室, 贵州, 贵阳, 550081
|
|
语种
|
中文 |
|
文献类型
|
研究性论文 |
|
ISSN
|
1000-4734 |
|
学科
|
地质学 |
|
基金
|
贵州省地质勘查基金项目
|
|
文献收藏号
|
CSCD:7039713
|
参考文献 共
61
共4页
|
|
1.
Lo C H. Age of the Emeishan flood magmatism and relations to Permian-Triassic boundary events.
Earth Planet Sci Lett,2002,198(3):449-458
|
CSCD被引
91
次
|
|
|
|
|
2.
Guo F. When did the Emeishan Mantle Plume activity start? Geochronological and geochemical evidence from ultramafic-mafic dikes in southwestern China.
International Geology Review,2004,46(3):6-234
|
CSCD被引
1
次
|
|
|
|
|
3.
He B. Sedimentation and lithofacies Paleogeography in southwestern China before and after the Emeishan flood volcanism: new insights into surface response to mantle plume activity.
Journal of Geology,2006,114(1):117-132
|
CSCD被引
42
次
|
|
|
|
|
4.
朱江. 贵州盘县峨眉山玄武岩系顶部凝灰岩LA-ICP-MS锆石U-Pb年龄:对峨眉山大火成岩省与生物大规模灭绝关系的约束.
岩石学报,2011,27(9):2743-2751
|
CSCD被引
36
次
|
|
|
|
|
5.
徐义刚. 我国大火成岩省和地幔柱研究进展与展望.
矿物岩石地球化学通报,2013,32(1):25-39
|
CSCD被引
81
次
|
|
|
|
|
6.
胡瑞忠. 地幔柱成矿系统:以峨眉山地幔柱为例.
地学前缘,2005(1):42-54
|
CSCD被引
71
次
|
|
|
|
|
7.
高振敏. 峨眉山地幔柱成矿作用分析.
矿物学报,2004(2):99-104
|
CSCD被引
20
次
|
|
|
|
|
8.
王登红. 地幔柱的概念、分类、演化与大规模成矿——对中国西南部的探讨.
地学前缘,2001(3):67-72
|
CSCD被引
46
次
|
|
|
|
|
9.
王焰. 二叠纪峨眉山地幔柱岩浆成矿作用的多样性.
矿物岩石地球化学通报,2017,36(3):404-417
|
CSCD被引
15
次
|
|
|
|
|
10.
Zhou M F. Geochemistry, petrogenesis, and metallogenesis of the Panzhihua gabbroic layered intrusion and associated Fe-Ti-V-oxide deposits, Sichuan Province, SW China.
Journal of Petrology,2005,46(11):2253-2280
|
CSCD被引
136
次
|
|
|
|
|
11.
秦震. 攀西地区碱性岩类稀有、稀土矿成矿条件及找矿前景.
四川地质学报,1995(2):102-112
|
CSCD被引
4
次
|
|
|
|
|
12.
孟昌忠. 峨眉山大火成岩省去顶作用与黔西铁-多金属矿床成因:锆石U-Pb同位素年代学约束.
中国科学:地球科学,2015,45(10):1469-1480
|
CSCD被引
11
次
|
|
|
|
|
13.
王居里. 滇东北峨眉山玄武岩区的沉积型铜矿床.
矿床地质,2006(6):663-671
|
CSCD被引
11
次
|
|
|
|
|
14.
王富东. 与峨眉山玄武岩有关的沉积型铜矿——“马豆子式”铜矿的成因研究.
中国科学:地球科学,2011,41(12):1851-1861
|
CSCD被引
5
次
|
|
|
|
|
15.
文俊. 川南沐川地区首次发现宣威组底部古风化壳-沉积型铌、稀土矿.
中国地质,2021
|
CSCD被引
1
次
|
|
|
|
|
16.
刘殿蕊. 云南宣威地区峨眉山玄武岩风化壳中发现铌、稀土矿.
中国地质,2020,47(2):540-541
|
CSCD被引
13
次
|
|
|
|
|
17.
杨瑞东. 贵州西部中、上二叠统界线附近风化壳类型及成矿作用.
矿物学报,2007,27(1):41-48
|
CSCD被引
16
次
|
|
|
|
|
18.
刘巽锋. 贵州火山凝灰岩型金矿地质特征及找矿意义.
中国地质,2001(1):30-35
|
CSCD被引
7
次
|
|
|
|
|
19.
王伟. 贵州峨眉山玄武岩区风化壳与成矿关系.
贵州大学学报(自然科学版),2006(4):366-370
|
CSCD被引
12
次
|
|
|
|
|
20.
王伟. 贵州西部玄武岩风化壳中稀土矿成矿机理及成矿模式.
四川地质学报,2011,31(4):420-423
|
CSCD被引
16
次
|
|
|
|
|
了解气象卫星更多信息，请访问