本文選題：鉑族元素　切入點：黑色巖系　出處：《礦物學報》2017年04期 　論文類型：期刊論文

【摘要】：北大巴山城口地區(qū)廣泛發(fā)育富集V、Ag、Se等多種元素的下寒武統(tǒng)黑色巖系,但是否存在鉑族元素礦化以及來源一直存在爭議。本文利用ICP-MS方法測定了城口地區(qū)孫家壩剖面下寒武統(tǒng)魯家坪組(對應(yīng)牛蹄塘組)黑色巖系多金屬富集層的鉑族元素(PGE)、Au和Ag含量,在判斷鉑族元素異常的基礎(chǔ)上,利用鉑族元素地球化學特征探討其來源。結(jié)果表明,該剖面黑色巖系樣品具有較高的PGE含量(32.2~142.5 ng/g),平均88.9 ng/g,與上地殼平均值對比具有明顯的PGE富集特征;同時金、銀也具有較高的含量,平均值分別為40.2 ng/g和31.7μg/g。鉑族元素配分模式表現(xiàn)為相對富集Pd、Pt、Os、Ru,虧損Ir、Rh,依據(jù)Ir含量以及與球粒隕石的對比分析,認為魯家坪組黑色巖系PGE不具備地外物質(zhì)來源。鉑族元素球粒隕石標準化配分模式、PGE含量順序及鉑族元素相關(guān)圖解顯示其來源可能與海底熱水作用關(guān)系密切。有機碳和PGE含量之間沒有明顯相關(guān)性,表明有機質(zhì)可能是通過改變氧化還原條件導致PGE進一步富集。城口地區(qū)埃迪卡拉紀-寒武紀過渡階段海底熱水作用和PGE異常的識別不僅對于理解黑色巖系型礦床的成因,而且對全球重大事件如寒武紀生命大爆發(fā)的認識都具有重要意義。
[Abstract]:The Lower Cambrian black rock series, which is rich in various elements such as VDU AgSe and other elements, is widely developed in Chengkou area of Bashan, Peking University. In this paper, ICP-MS method was used to determine the platinum group in the polymetallic enrichment layer of the lower Cambrian LU Jiaping formation (corresponding Niutetang formation) in the Sunjiaba section of Chengkou area. The contents of au and Ag, On the basis of judging the anomaly of platinum group elements, the geochemical characteristics of platinum group elements are used to discuss its origin. The black rock series samples in this section have a high PGE content of 32.2n 142.5 ng / g, with an average of 88.9 ng / g, and have obvious PGE enrichment characteristics compared with the average value of the upper crust, and the gold and silver contents are also relatively high. The average values were 40.2 ng/g and 31.7 渭 g / g, respectively. The platinum-group partitioning pattern was characterized by relative enrichment of PD PtO Osn Ruand and depletion of Ir-Rh.According to ir content and comparative analysis with chondrites, It is considered that the PGE of the black rock series of the Lujiaping formation does not have a source of extraterrestrial material. The PGE content sequence of the standardized partitioning model of chondrites of platinum group elements and the diagram of the elements of platinum group may be closely related to the interaction of submarine hot water. There was no significant correlation between carbon content and PGE content. It is suggested that the organic matter may be further enriched by changing the redox conditions. The identification of submarine hot water and PGE anomalies during the transition from Edikala to Cambrian in Chengkou area is not only helpful in understanding the genesis of the black rock series deposits. Moreover, the understanding of the major global events such as Cambrian life explosion is of great significance.
【作者單位】： 外生成礦與礦山環(huán)境重慶市重點實驗室重慶地質(zhì)礦產(chǎn)研究院;煤炭資源與安全開采國家重點實驗室重慶研究中心;重慶市地質(zhì)調(diào)查院;
【基金】：國土資源部公益性行業(yè)科研專項項目(批準號:201311105) 國家自然科學基金項目(批準號:41602172) 重慶市國土資源和房屋管理局科研項目(批準號:CQGT-KJ-2014010;KJ-2016013) 重慶市基礎(chǔ)科學與前沿技術(shù)研究項目(編號:cstc2017jcyj AX0364)
【分類號】：P618.53

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本文編號：1576352