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太行山北段木吉村髫髻山组安山岩锆石U Pb年龄和Hf同位素特征及其对区域成岩成矿规律的指示
投稿时间:2015-08-03  修订日期:2015-12-17  点此下载全文
引用本文:段超,毛景文,谢桂青,陈志宽,马国玺,王志敏,陈焘,李伟.2016.太行山北段木吉村髫髻山组安山岩锆石U Pb年龄和Hf同位素特征及其对区域成岩成矿规律的指示[J].地质学报,90(2):250-266.
DUAN Chao,MAO Jingwen,XIE Guiqing,CHEN Zhikuan,MA Guox,WANG Zhimin,CHEN Tao,LI Wei.2016.Zircon U Pb Geochronological and Hf Isotope Study on Tiaojishan Volcanic Formation, Mujicun, North Taihang Mountain and Implications for Regional Metallogeny and Magmatism[J].Acta Geologica Sinica,90(2):250-266.
DOI:
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作者单位E-mail
段超 国土资源部成矿规律与资源评价重点实验室中国地质科学院矿产资源研究所北京100037 duanchao626@yahoo.com 
毛景文 国土资源部成矿规律与资源评价重点实验室中国地质科学院矿产资源研究所北京100037  
谢桂青 国土资源部成矿规律与资源评价重点实验室中国地质科学院矿产资源研究所北京100037  
陈志宽 河北省保定地质工程勘查院河北保定071051  
马国玺 河北省保定地质工程勘查院河北保定071051  
王志敏 河北省保定地质工程勘查院河北保定071051  
陈焘 河北省区域地质矿产调查研究所河北廊坊065000  
李伟 国土资源部成矿规律与资源评价重点实验室中国地质科学院矿产资源研究所北京100037中国地质大学武汉430074  
基金项目:中国地质调查局地质调查工作项目(12120113093600)
中文摘要:太行山北段是中国东部中生代重要的成矿区带,髫髻山组火山岩记录了该地区中生代大规模成岩成矿事件发生的时代和有关岩浆作用源区的信息。髫髻山组安山岩中锆石大多具有明显的核幔结构, LA MC ICP MS测试得出,锆石幔部年龄为144~145Ma左右,核部年龄为208~265Ga。两组锆石年龄中,前者代表了髫髻山组火山岩的形成时代,两件样品加权平均年龄分别为14528±044Ma和14461±076Ma;后者年龄与华北克拉通在前寒武纪增生变质等演化时代一致,揭示出火山岩形成过程中华北克拉通古老地壳的参与。对应两组年龄,锆石Hf同位素特征也明显的分为两组,中生代εHf (t)值集中于-25~-10之间,表现为壳幔混合源区特征;新太古代—古元古代εHf(t)值集中于0~10之间,表现为地壳增生的特征,与华北克拉通前寒武纪的演化时代相一致。结合已有岩石地球化学研究,髫髻山组火山岩的形成源于富集地幔部分熔融,在岩浆上侵过程中同化混染(或混合)了华北克拉通的古老地壳,在经历了分离结晶作用后侵位产出。髫髻山组火山岩是晚中生代华北克拉通构造背景转换的代表,在其形成后发育有大量与之相关的斑岩型铜钼矿床,通过总结对比中生代中国东部成岩成矿规律,我们推测太行山地区在中生代可能形成有两期重要的成矿事件,一期以斑岩型铜—钼矿床的形成为特征,另一期由金矿床的产出为代表。
中文关键词:太行山北段  木吉村  髫髻山组火山岩  锆石U Pb年龄
 
Zircon U Pb Geochronological and Hf Isotope Study on Tiaojishan Volcanic Formation, Mujicun, North Taihang Mountain and Implications for Regional Metallogeny and Magmatism
Author NameAffiliationE-mail
DUAN Chao Ministry of Land and Resources of the People’s Republic of China (MLR), Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037 duanchao626@yahoo.com 
MAO Jingwen Ministry of Land and Resources of the People’s Republic of China (MLR), Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037  
XIE Guiqing Ministry of Land and Resources of the People’s Republic of China (MLR), Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037  
CHEN Zhikuan Baoding Institute of Geological Engineering and Exploration of Hebei Province, Baoding, Hebei, 071051  
MA Guox Baoding Institute of Geological Engineering and Exploration of Hebei Province, Baoding, Hebei, 071051  
WANG Zhimin Baoding Institute of Geological Engineering and Exploration of Hebei Province, Baoding, Hebei, 071051  
CHEN Tao Hebei Institute of Regioonal Geology and Mineral Resources Survey, Langfang, Hebei, 065000  
LI Wei Ministry of Land and Resources of the People’s Republic of China (MLR), Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing, 100037 China University of Geosciences, Wuhan, 430074  
Abstract:The North Taihangshan Mountain area is one of the most important metallogenic belts in the East China. In this area, the Tiaojishan volcanic formation recorded the metallogenic magmatism event times and resources in Mesozoic. The majority zircons from the andesite show the core mantle texture. By LA MC ICP MS U Pb geochronology dating on the core and mantle of zircons, two group ages have been gained. One is younger, with two weighted average ages as 14528±044Ma and 14461± 076Ma from two samples, which indicates the andesite forming time, and the other one is 208~ 265Ga from the core of zircons, which indicates the old crustal material being in the magma forming. LA MC ICP MS in situ Hf isotopic analysis of zircons gains two different εHf(t) values ranges corresponded to the two group U Pb ages. For the younger group (~145Ma), the εHf(t) values are in the range of -25 to -10, which suggests the volcanic rocks originated from the interaction process (mixing or mingling) between the enrich mantle and the old crust; for the other group (208~265Ga), the εHf(t) values are in the range of 0 to 10, which indicate the core of zircon derived from juvenile crusts same with the major crustal growth of the North China Craton (NCC), and suggests the old crust material have been involved during this magmatism. Combined with the geochemistry studies, the Tiaojishan volcanic rocks might originate from partial melting of an enriched mantle, contaminated by the old NCC crustal component en route, then emplaced after fractional crystallization. This volcanic event was formed in Mesozoic metallogenic magmatism event, and it implicates the NCC tectonic changing by lithosphere extension in Late Mesozoic. Based on the geochronology data, we infer that there might be two major metallogenic events, one is characterized by the forming of porphyry Cu Mo deposits, and the other one is characterized by the forming of Au deposits.
keywords:North Taihang Mountain  Mujicun  Tiaojishan volcanic rocks  U Pb dating  Hf isotope
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