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范飞鹏,肖惠良,陈乐柱,李海立,康从轩,刘建雄,邓中林,李少斌,林梗伟,周霞.粤东横田花岗斑岩SHRIMP锆石U-Pb年龄、岩石地球化学和锆石Lu-Hf同位素组成及其地质意义[J].地质通报,2017,(7):1218-1230.
粤东横田花岗斑岩SHRIMP锆石U-Pb年龄、岩石地球化学和锆石Lu-Hf同位素组成及其地质意义    点此下载全文
范飞鹏1  肖惠良1  陈乐柱1  李海立1  康从轩1  刘建雄2  邓中林2  李少斌3  林梗伟3  周霞3
1. 中国地质调查局南京地质调查中心, 江苏 南京 210016;
2. 广东省佛山地质局, 广东 佛山 528000;
3. 广东省第二地质大队, 广东 汕头 515000
基金项目:中国地质调查局项目《广东厚婆坳铜锡多金属矿整装勘查区找矿预测模型构建与找矿预测研究》(编号:12120114015701)和《武夷山成矿带龙泉-上杭地区地质矿产调查》(编号:DD20160037)
DOI:
摘要:
      横田花岗斑岩位于粤东田东钨锡多金属矿床的中部。以横田花岗斑岩为研究对象,开展了SHRIMP锆石U-Pb定年、岩石地球化学、锆石Lu-Hf同位素组成特征研究。花岗斑岩多呈岩株产出,灰白色,斑状结构,块状构造,主要由斑晶(10%)和基质(90%)组成,斑晶由斜长石、钾长石、石英、黑云母组成,杂乱分布,粒度为0.6~6mm,基质由长石、石英、黑云母组成,长石粒度为0.02~0.25mm。获得花岗斑岩锆石206Pb/238U年龄加权平均值为142±1Ma,说明岩体形成于早白垩世。主量、微量元素特征显示,花岗斑岩属于高钾钙碱性强过铝质,富集Rb、U、Nd、Hf等元素,亏损Ba、Nb、Sr、P、Ti等,与高分异的S型花岗岩相似。花岗斑岩的锆石εHft)值均小于0,在t-εHft)和t-(176Hf/177Hf)i图上,所有样品点均落在球粒陨石演化线之下和华南中元古代基底演化线之上,二阶段模式年龄变化范围为1.28~1.47Ga,表明成岩物质主要来源于中元古代古老地壳变质泥岩部分熔融。
关键词:粤东  横田  花岗斑岩  SHRIMP锆石 U-Pb定年  地球化学  Lu-Hf同位素
SHRIMP zircon U-Pb dat-ing, geochemistry and zircon Lu-Hf isotopic composition of Hengtian granite porphyries in eastern Guangdong Province and their geological implications    Download Fulltext
FAN Feipeng1  XIAO Huiliang1  CHEN Lezhu1  LI Haili1  KANG Congxuan1  LIU Jianxiong2  DENG Zhonglin2  LI Shaobin3  LIN Gengwei3  ZHOU Xia3
1. Nanjing Center of Geological Survey, CGS, Nanjing 210016, Jiangsu, China;
2. Foshan Geological Bureau of Guangdong Province, Foshan 528000, Guangdong, China;
3. No.2 Geological Party of Guangdong, Shantou 515300, Guangdong, China
Fund Project:
Abstract:
      The granite porphyry related to tungsten-tin polymetallic deposits was discovered in Hengtian area, eastern Guangdong Province. In this paper, the authors reported detailed studies of SHRIMP zircon U-Pb dating, major elements,trace elements and zir-con Hf isotopic compositions of the granite porphyry. The granite porphyries are mostly grayish white dykes with porphyritic texture and massive structure. They mainly consist of phenocrysts (10%) and matrix (90%), the phenocrysts are composed of plagioclase, Kfeldspar, quartz and biotite with particle size of 0.6~6mm in mixed and disorderly distribution, whereas the matrix is composed of feldspar, quartz and biotite, with the feldspar particle size being generally 0.02~0.25mm. Zircon U-Pb age analysis for the granite porphyry yielded a weighted average 206Pb/238U age of 142±1Ma, indicating that the rock was formed in Early Cretaceous. Major and trace element characteristics show that the granite porphyry belongs to high potassium calc-alkaline peraluminous series en-riched in Rb,U, Nd, HF and depleted in Ba, Nb, Sr, P, Ti, similar to features of highly fractionated S-type granites. The εHf(t) values of the granite porphyry are less than 0; in t-εHf(t)and t-(176Hf/177Hf)i diagrams, all points fall under the chondritic evolu-tion line and above the south of the Mesoproterozoic basement evolution line. Moreover, the ages are between 1.28Ga and 1.47Ga,indicating that rock-forming materials were mainly derived from the partial melting of metamorphic mudstone in Meso-proterozoic ancient crust.
Keywords:eastern Guangdong Province  Hengtian  granite porphyry  SHRIMP zircon U-Pb dating  geochemistry  Lu-Hf isotopes
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