新疆东北部三塘湖盆地卡拉岗组火山岩的形成时代:锆石U-Pb定年

Translated title of the contribution: The age of Kalagang formation in the Santanghu basin, northeast Xinjiang: evidence from zircons U-Pb dating of volcanic rocks

Ming Min Zhang*, Hong Han Chen, Jian Ping Zheng, Yu Ping Su

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Kalagang Formation is developed widely in the Santanghu basin, northeast Xinjiang. The eruption age of volcanic rocks in this Formation was considered as either Permian or Carboniferous. LA-ICP-MS U-Pb dating was made on the basaltic zircons for three samples, which were collected from drill hole (Ma 17) at different depths. Zircons in the basalt at 1543.1 m yield weighed mean age of 343. 5±2. 4 Ma (n = 11, MSWD = 0. 74). Those at 1954. 3 m show two groups of weighted mean ages, 331. 3±5. 0Ma (n = 6, MSWD = 1.4) and 306. 6±5. 3 Ma (n = 9, MSWD= 4. 5), respectively. Zircons in the sample at 2327. 0 m give weighted mean age of 325. 2±3. 0 Ma (n = 19, MSWD = 2. 2). This study considers the minimum age, 306. 6 Ma, as the eruption age of the volcanic rocks in the Kalagang Formation, suggesting that this volcanic suite was formed in Carboniferous instead of formerly widely-accepted Permian. Zircons at the higher depth of the drill hole are old (early Carboniferous) , Zircons at the lower depth are younger (Late Carboniferous). This may indicate that volcanic rocks in Malang depression developed within different ages, showing a characteristic of multi-stage eruption, old zircons at the higher depth of Kalagang Formation may represent the early magma crystallization. Therefore, Kalagang Formation should be formed at the Late Carboniferous.

Original languageChinese
Pages (from-to)400-408
Number of pages9
JournalBulletin of Mineralogy Petrology and Geochemistry
Volume29
Issue number4
Publication statusPublished - Oct 2010
Externally publishedYes

Keywords

  • Basalt
  • Kalagang formation
  • Late carboniferous
  • Santanghu basin
  • Zircon u-pb dating

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