ISSN 1006-3021 CN11-3474/P
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南盘江盆地八渡辉绿岩斜锆石和锆石U-Pb年龄及其地质意义
  
关键词:Nanpanjiang Basin  Badu diabase  baddeleyite  zircon  SIMS  U-Pb dating  geodynamic
基金项目:国家自然科学基金项目(编号: 40472119; 40872147);中国地质调查局项目(编号: 12120113067500; DD20160201-07);中国科学院大学博士研究生国际合作培养计划(编号: UCAS[2015]37)
作者单位E-mail
夏文静 中国科学院大学地球与行星科学学院
法国奥尔良大学地球科学研究所 
xiawenjing89@163.com 
闫全人 中国科学院大学地球与行星科学学院 qryan@ucas.edu.cn 
向忠金 中国地质科学院地质研究所  
夏磊 中国科学院大学地球与行星科学学院
中国石化中原油田分公司勘探开发研究院 
 
江文 中国科学院大学地球与行星科学学院  
李晓剑 中国科学院大学地球与行星科学学院  
周斌 中国科学院大学地球与行星科学学院  
邓莉 中国科学院大学地球与行星科学学院  
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摘要:
Baddeleyite and Zircon U-Pb Dating of Badu Diabase in the Nanpanjiang Basin and Its Tectonic Significance
      The Nanpanjiang basin is the biggest terrigenous clasitic basin developed on the southwest margin of the South China block. The tectonic setting of the Nanpanjiang Basin during its formation, the onset time and the mechanism of the basin’s opening have been long debated. These debates obstruct our understanding on the evolution of the Indochina orogen. Inside the Nanpanjiang basin, in addition to the Triassic deposition, some Paleozoic carbonatites were also outcropped, which developed into faulted blocks of the basement during the basin stretching. Around the Paleozoic carbonate faulted blocks, some stratoid or veined diabase were outcropped.As the initial record of the basin evolution, the diabase is a perfect research target for studying the age and geodynamics of the basin's opening. In this study, the diabase samples were acquired near to Badu Town, Tianlin County, Guangxi, which is in the southeastern part of the Nanpanjiang Basin. The U-Pb dating was conducted with Cameca IMS 1280 on the baddeleyite and zircon concentrated from the diabase samples. The results yielded the weighted mean 206Pb/238U ages of (269.3±4.2) Ma (N=15, MSWD=0.27) and (265.0±2.9) Ma (N=8, MSWD=0.02), respectively. This result demonstrates that the Badu diabase emplaced during the Wordian, Middle Permian (265.1~268.8 Ma), and indicates that the Nanpanjiang Basin was stretching during this period. Besides this magmatic event dated by this study, a later mafic magmatic event continued widely in the Nanpanjiang basin during the Late Permian to the Early Triassic (258~248 Ma). Sedimentologic study suggests that, from the Late Permian to the Early Triassic, the sedimentary environment of the Nanpanjiang basin changed from calci-clastic platform to turbidite fan. All these facts suggest that the Nanpanjiang Basin experienced extension during the Middle Permian to Early Triassic.
XIA Wen-jing,YAN Quan-ren,XIANG Zhong-jin,XIA Lei,JIANG Wen,LI Xiao-jian,ZHOU Bin,DENG Li.2019.Baddeleyite and Zircon U-Pb Dating of Badu Diabase in the Nanpanjiang Basin and Its Tectonic Significance[J].Acta Geoscientica Sinica,40(2):265-278.
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