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High-precision Dating and Geological Significance of Chang 7 Tuff Zircon of the Triassic Yanchang Formation, Ordos Basin in Central China
投稿时间:2018-08-01  修订日期:2018-12-20  点此下载全文
引用本文:ZHU Rukai,CUI Jingwei,DENG Shenghui,LUO Zhong,LU Yuanzheng,QIU Zhen.2019.High-precision Dating and Geological Significance of Chang 7 Tuff Zircon of the Triassic Yanchang Formation, Ordos Basin in Central China[J].ACTA GEOLOGICA SINICA(English edition),93(6):1823~1834
摘要点击次数: 71
全文下载次数: 92
DOI:10.1111/1755-6724.14329
作者单位E-mail
ZHU Rukai Research Institute of Petroleum Exploration and Development, Beijing 100083, China cuijingwei@petrochina.com.cn 
CUI Jingwei Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
DENG Shenghui Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
LUO Zhong Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
LU Yuanzheng Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
QIU Zhen Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
 
Author NameAffiliationE-mail
ZHU Rukai Research Institute of Petroleum Exploration and Development, Beijing 100083, China cuijingwei@petrochina.com.cn 
CUI Jingwei Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
DENG Shenghui Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
LUO Zhong Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
LU Yuanzheng Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
QIU Zhen Research Institute of Petroleum Exploration and Development, Beijing 100083, China  
Abstract:The Ordos Basin, as the second largest petroliferous basin of China, contains abundant oil and gas resources, oil shale, and sandstone-type uranium mineral resources. Chang 7 shale is not only the major source rock of the Mesozoic petroliferous system of the Basin, but is also crucial in determining the space-time distribution relationship of the shale section for the effective exploration and development of the Basin’s oil and gas resources. To obtain a highly precise age of the shale development section, we collected tuff samples from the top and bottom profile of the Chang 7 Member, Yishi Village, Yaoqu Town, Tongchuan District, on the southern margin of the Ordos Basin and performed high-precision chemical abrasion (CA)–isotope dilution (ID)–thermal ionization mass spectrometry (TIMS) zircon U-Pb dating on the basis of extensive laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) zircon U-Pb dating data. Our results show the precise ages of the top and bottom zircon in the Chang 7 shale to be 241.06±0.12 Ma and 241.558±0.093 Ma, respectively. We first obtained Chang 7 age data with Grade 0.1-Ma precision and then determined the age of the shale development in the Chang 7 Member to be the early-Middle Triassic Ladinian. This result is supported by paleontological evidence. The deposition duration of the Chang 7 shale is 0.5Ma with an average deposition rate of the shale section being 5.3 cm/ka. Our research results provide time scale and basic data for further investigation of the basin–mountain coupling relation of the shale section, the sedimentary environment and volcanic ash and organic-matter-rich shale development relation, and the organism break-out and organic-matter enrichment mechanism.
keywords:Ordos Basin, Chang 7 Member, tuff, zircon U-Pb dating
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