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冀东分水岭岩体锆石U-Pb年代学、地球化学特征及地质意义
投稿时间:2018-04-12  修订日期:2018-06-13  点此下载全文
引用本文:李玉静,王玉芳,徐国新,李智斌,齐云飞,孙金龙,赵丙刚,张勃,越悦.2018.冀东分水岭岩体锆石U-Pb年代学、地球化学特征及地质意义[J].地质学报,92(9):1904-1917
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作者单位E-mail
李玉静 1) 河北省地质学会石家庄050051 386777338@qq.com 
王玉芳 2) 河北省地矿局第八地质大队河北秦皇岛066001  
徐国新 2) 河北省地矿局第八地质大队河北秦皇岛066001  
李智斌 2) 河北省地矿局第八地质大队河北秦皇岛066001  
齐云飞 2) 河北省地矿局第八地质大队河北秦皇岛066001  
孙金龙 2) 河北省地矿局第八地质大队河北秦皇岛066001  
赵丙刚 2) 河北省地矿局第八地质大队河北秦皇岛066001  
张勃 2) 河北省地矿局第八地质大队河北秦皇岛066001  
越悦 1) 河北省地质学会石家庄050051  
基金项目:“河北省兴隆县太平村钼多金属矿成矿机制及找矿方向研究”(201406)资助。
中文摘要:冀东分水岭岩体位于马兰峪隆起西段,为复式岩体,其岩性为花岗闪长岩和黑云母二长花岗岩,花岗闪长岩呈带状环绕黑云母二长花岗岩分布,锆石U-Pb定年揭示其年龄分别为157.4±2.7Ma和162.0±4.0Ma。花岗闪长岩的SiO2 64.50%~65.56%,K2O+Na2O 7.24%~7.70 %,K2O/Na 2O 0.58~0.67,A/CNK 0.91~0.97,呈高硅富钾,属准铝质高钾钙碱性系列,为I型花岗岩;而黑云母二长花岗岩SiO2 73.25%~74.56%, K2O+Na2O 7.22%~8.58 %,K2O/ Na2O 0.86~1.04,A/CNK 1.09~1.24,较花岗闪长岩更富硅、钾,为过铝质高钾钙碱性系列,属成熟度不高的A型花岗岩。两者稀土配分曲线呈右倾型式,具稀土总量较低,轻重稀土分馏明显,微量元素均亏损Nb-Ta、Zr-Hf,显示以壳源成分为主,具幔源混染特征。花岗闪长岩具弱Eu正异常,且富集Sr,源区深度较大;而黑云母二长花岗岩具Eu负异常,亏损Sr,源区有少量斜长石残留。岩体形成与太平洋板块俯冲构造背景密切相关,为中生代构造转换体制的产物。
中文关键词:分水岭复式岩体  U-Pb锆石年代学  地球化学特征  岩浆起源  构造背景
 
Geochronology, Geochemical Characteristics in the Fenshuiling Complex in the East Hebei Province and Its Significance
NameInstitution
LI YujingThe Eighth Geo-Team of Hebei Bureau of Geology and Mineral Resources, Qinhuangdao, Hebei, 066001
WANG Yufang2) Geological Society of Hebei Province, Shijiazhuang, 050051
XU Guoxin2) Geological Society of Hebei Province, Shijiazhuang, 050051
LI Zhibin2) Geological Society of Hebei Province, Shijiazhuang, 050051
QI Yunfei2) Geological Society of Hebei Province, Shijiazhuang, 050051
SUN Jinlong2) Geological Society of Hebei Province, Shijiazhuang, 050051
ZHAO Binggang2) Geological Society of Hebei Province, Shijiazhuang, 050051
ZHANG Bo2) Geological Society of Hebei Province, Shijiazhuang, 050051
ZHAO YueThe Eighth Geo-Team of Hebei Bureau of Geology and Mineral Resources, Qinhuangdao, Hebei, 066001
Abstract:The Fenshuiling Complex is situated in the west of the Malanyu uplift, that is the west of the intrusive rock belt of the central east Hebei Province. U-Pb Zircon Geochronology shows that granodiorite:157.4±2.7Ma,biotite adamellite162.0±4.0Ma,later granodiorite distributed around the early biotite adamellite in a ring belt. It is a typcial complex massif. The granodiorite belongs to the metaluminous high potassium calc-alkaline series,I type granite, SiO2 64.50%~65.56%,(K2O+Na2O) 7.24%~7.70 %,(K2O/Na2O)0.58~0.67,A/CNK 0.91~0.97}.In contrast,the biotite adamellite has a higher content about SiO2and K2O,belongs to peraluminous high potassium calc-alkaline series, I-A type granite {SiO2 73.25%~74.56%, (K2O+Na2O) 7.22%~8.58 %,(K2O/ Na2O) 0.86~1.04; A/CNK 1.09~1.24}.From REE and trace element,the granodiorite is relatively low in the total REE,and enrichmet in LREE and depieton in HREE,loss of Nb-Ta,Zr-Hf.All this show more crustal genesis,and less mantle genesis.The granodiorite positive Eu, Sr anomaly. While the biotite adamellite negative Eu,Sr anomaly, show that granodiorite source region is deeper than biotite adamellite. About tectonic setting,the formation of the rock mass is closely related with the subduction of Pacific plate,form from (syn-collision)-(aftert clllosion), producted by transformation of teconic.Now, the research on Fenshuiling complex has a great significance in summaring the laws of magmation and tectonic activity.
keywords:U-Pb zircon geochronology  geochemical characteristics  origin of magma  tectonic setting  Fenshuiling complex  Hebei Province
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