Stratigraphic Ages and Provenance Characteristics of Wujiashan Group in West Qinling, China: Evidences from Detrital Zircon U-Pb Age(PDF)
《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]
- Issue:
- 2018年第02期
- Page:
- 111-132
- Research Field:
- 基础地质与矿产地质
- Publishing date:
Info
- Title:
- Stratigraphic Ages and Provenance Characteristics of Wujiashan Group in West Qinling, China: Evidences from Detrital Zircon U-Pb Age
- Author(s):
- DING Zhen-ju; WEN Cheng-xiong; GUO A-qian; NIU Guang-de; WANG Zeng-xiang; LIU Zhi-yu
- 1. Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, Hubei, China; 2. Hunan Institute of Geological Survey, Changsha 410116, Hunan, China; 3. Yunnan Institute of Geological Survey, Kunming 650216, Yunnan, China; 4. Gansu Nonferrous Geological Survey Institute, Lanzhou 730000, Gansu, China; 5. Cores and Samples Center of Land and Resources, China Geological Survey, Sanhe 065201, Hebei, China
- Keywords:
- stratigraphic age; provenance; zircon U-Pb age; Devonian; North Qinling terrane; South Qinling terrane; Wujiashan Group; West Qinling
- PACS:
- P597
- DOI:
- -
- Abstract:
- LA-ICP-MS detrital zircon U-Pb ages of 4 samples from Wujiashan Group in West Qinling, China were used to establish the maximum depositional age and trace the provenance. The detrital zircon U-Pb ages are (399±3)-(2 858±43)Ma with two main ranges of 0.40-0.50 Ga and 0.70-1.05 Ga, and with a small amount ranges of 1.10-1.40, 1.45-1.85 and 2.35-2.65 Ga, respectively. The U-Pb ages of two youngest detrial zircons are 399 Ma and 401 Ma, and place the maximum deposition age of Wujiashan Group at ～400 Ma; therefore, Wujiashan Group belongs to LowerMiddle Devonian. On the basis of the comparison of U-Pb age spectra of Wujishan Group with the magmatism recorded by zircon U-Pb ages from North Qinling terrane, North China Block, South Qinling terrane, and South China Block (Yangtze Block), the results show that the detrital sources of 0.40-0.50 Ga zircons originate from North Qinling terrane, and those of 0.70-1.05 Ga mainly from North Qinling terrane with minor contribution from South Qinling terrane or Yangtze Block; the detrital zircons of 1.10-1.85 Ga come from North Qinling terrane, and those of 2.35-2.65 Ga from South Qinling terrane, Yangtze Block or North China Block. In general, Wujiashan Group is mainly of a provenance of North Qinling terrane, with a small proportion from South Qinling terrane or Yangtze Block. The stratigraphic ages and provenance of Wujiashan Group likely indicate that the closure time of Qinling Palaeozoic ocean in West Qinling is not later than Devonian.
Last Update: 2018-04-19