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山东省鲁西金刚石的类型、源区及区域壳幔演化背景
投稿时间:2020-02-17  修订日期:2020-06-04  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020237
摘要点击次数: 28
全文下载次数: 43
作者单位E-mail
宋明春 山东省地质矿产勘查开发局 mingchuns@163.com 
余西顺 山东省第七地质矿产勘查院  
宋英昕 山东省地质科学研究院  
肖丙建 山东省第七地质矿产勘查院  
周登诗 山东省第七地质矿产勘查院  
高存山 山东省第七地质矿产勘查院  
冯爱平 山东省第七地质矿产勘查院  
基金项目:山东省重点研发计划(软科学项目)(编号 2019RKB48002)、山东省泰山学者建设工程专项经费(编号ts201511076)和山东省重点研发计划(编号 2017CXGC1604)
中文摘要:山东省鲁西地区具有工业价值的金刚石矿有原生金刚石矿和金刚石砂矿两种类型,前者的母岩类型主要有金伯利岩型和煌斑岩型,后者的母岩类型有砾岩型和砂岩型,并产于第四纪小埠岭组和于泉组中。寒武纪李官组、石炭纪本溪组、侏罗纪三台组、古近纪官庄群和新近纪白彦组也是金刚石的储集层,但均达不到工业利用的要求。这些储集层中所含的金刚石比较而言,蒙阴和费县等地的本溪组中的粒度最大,平邑—泗水地区白彦组中的含量最富,临沂金雀山三台组中的完整晶型者占比最高,枣庄上泥河和泗水踅庄地区李官组中的金刚石熔蚀、磨圆最严重。不同层位和类型的金刚石,其源区、形成时代和构造背景不同。岩相古地理分析表明,李官组金刚石来源于其西南侧马山—四海山一带早前寒武纪结晶基底中的超镁铁质岩,这些超镁铁质岩形成于新太古代,元古宙末早前寒武纪结晶基底隆起、超镁铁质岩遭受剥蚀,少量金刚石沉积于寒武纪底部的李官组砾岩中;本溪组和三台组金刚石的分布和特征指示其源区为蒙阴金伯利岩,蒙阴金伯利岩形成于早—中奥陶世,金伯利岩形成之后发生的加里东运动和印支运动—早燕山运动造成鲁西中部的徂徕山—蒙山一带隆起,金伯利岩被抬升至地表遭受剥蚀,金刚石分别沉积于本溪组和三台组砾岩中;官庄群、白彦组、小埠岭组和于泉组中金刚石的分布和特征指示其源区也主要是蒙阴金伯利岩,新生代鲁西北部的徂徕山-蒙山隆起仍然处于强烈隆升状态,造成白彦组、小埠岭组和于泉组的金刚石富集区均分布于鲁西的南部区域。不同时代金刚石源区的地幔地球化学性状明显不同,华北陆块自太古宙至古元古代地幔源区的εNd(t)=+0.5~+4,指示上地幔处于弱亏损状态;鲁西金伯利岩的εNd(t)值变化于-4.78~+2.76,暗示鲁西早古生代地幔总体处于弱富集状态;鲁西中生代镁铁质岩石的εNd(t)介于-9.2~-21.21,说明地幔于中生代发生强烈富集。鲁西金伯利岩型金刚石原生矿源自于早古生代弱富集地幔。
中文关键词:金刚石  储集层  不整合  地幔  构造运动  山东鲁西
 
Types, sources and regional crust-mantle evolution background of diamond in the western Shandong Province
Author NameAffiliationE-mail
songmingchun Shandong Provincial No.6 Exploration Institute of Geology and Mineral Resources mingchuns@163.com 
Yu Xishun Shandong Provincial No.7 Exploration Institute of Geology and Mineral Resources  
Song Yingxin Shandong Provincial Bureau of Geology & Mineral Resources  
Xiao Bingjian Shandong Provincial No.7 Exploration Institute of Geology and Mineral Resources  
Zhou Dengshi Shandong Provincial No.7 Exploration Institute of Geology and Mineral Resources  
Gao Cunshan Shandong Provincial No.7 Exploration Institute of Geology and Mineral Resources  
Feng Aiping Shandong Provincial No.7 Exploration Institute of Geology and Mineral Resources  
Abstract:There are two types of diamond ores with industrial value in western Shandong Province, including primary diamond ore and alluvial diamond ore. Diamond-bearing mother rocks of primary diamond ores mainly are kimberlite and lamprophyre. Diamond-bearing mother rocks of alluvial diamond ores are conglomerate and sandstone, and they occur in Quaternary Xiaobuling Formation and Yuquan Formation. Cambrian Liguan Formation, Carboniferous Benxi Formation, Jurassic Santai Formation, Paleogene Guanzhuang group and Neogene Baiyan Formation are also the diamond-bearing strata, but they can not meet the industrial utilization requirement. Compared to the diamonds contained in these reservoirs, the diamond particle size in Mengyin and Feixian of Benxi Formation is the largest, the diamond content in Pingyi-Sishui area of Baiyan Formation is the richest, the proportion of complete crystal shape in Linyi Jinqueshan of Santai Formation is the highest, and the erosion and roundness in Zaozhuang Shangnihe and Sishui Xuezhuang area of Liguan Formation are the most serious. Different strata and types of diamond indicate different source region, forming age and tectonic backgrounds. Lithofacies paleogeography analysis shows that the diamonds of Liguan Formation are originate from its southwest of ultramafic rocks in the Early Precambrian crystal basement of the Mashan-Sihaishan region. These ultramafic rocks were formed in the Neoarchean, and then the Early Precambrian crystal basement uplift in the Late Proterozoic, and the ultramafic rocks underwent thereafter denudation, at last a small amount of diamond was deposited in the Liguan group conglomerates at the bottom of the Cambrian. The distribution and characteristics of diamonds in Benxi and Santai Formation indicate that the source region is Mengyin kimberlite. The kimberlite in Mengyin was formed in the Early-Middle Ordovician. After the formation of kimberlite, the Caledonian and Indosinian Movement-the Early Yanshan Movement resulted in the uplift of Culaishan-Mengshan district. Afterwards, the kimberlites were lifted to the surface and denuded, and the diamonds were deposited in conglomerate of Benxi and Santai Formation respectively. The distribution and characteristics of diamonds in Guanzhuang Formation, Baiyan Formation, Xiaobuling Formation and Yuquan Formation indicate that they also mainly come from Mengyin kimberlites. The Cenozoic Culaishan-Mengshan in the north of western Shandong Province is still in a strong uplift state, which results in the distribution of Baiyan Formation, Xiaobuling Formation and Yuquan Formation diamond enrichment areas in the south of western Shandong Province. The geochemical characteristics of the diamond source region in different ages indicate the chemical evolution of mantle. North China block from Archean to Paleoproterozoic mantle source region of εNd(t) value is from +0.5 to +4 indicates that the upper mantle is in a weak deficit condition. The εNd(t) value of kimberlite in the western Shandong Province varied from -4.78 to +2.76, suggesting that the Paleozoic mantle was in a state of weak enrichment. The εNd(t) value of Mesozoic mafic rocks in the western Shandong Province varied from -9.2 to +21.21, suggesting that the Mesozoic mantle was in a state of strongly enrichment. Diamond deposits in kimberlite pipes were derived from early Paleozoic weak enrichment mantle in the western Shandong Province.
keywords:diamond  reservoir stratum  unconformity  mantle  tectonic movement  Luxi in Shandong Province
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