太行山北段木吉村髫髻山组安山岩锆石U-Pb年龄和Hf同位素特征及其对区域成岩成矿规律的指示

Translated title of the contribution: In-situ U-Pb dating and Hf isotopic analyses of zircons in the volcanic rock of the Lanqi Formation in the Beipiao area, western Liaoning Province

Qiang Ma*, Jian Ping Zheng

*Corresponding author for this work

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

Large-scale volcanic rocks of the Lanqi Formation are developed in the Changheyingzi area, western. Liaoning Province. LA-ICPMS zircon U-Pb dating gives the Late Jurassic eruption age for andesitic breccia lava of the Lanqi. Formation as 159. 4 ±3. 4 Ma. In-situ zircon Hf analyses show that Lanqi Formation have 176Hf/177 Hf values of 0. 282098 to 0. 282789,εHf (t) values of-20. 4 to + 4.1, tDM(depleted mantle model age) of 0. 7-1. 6Ga and tcrust (average crustal model age) of 0. 9-2. 5Ga, respectively. Combining the published geochemical data of the volcanic rocks, especially their Sr-Nd isotopic compositions, we interpret the andesitic volcanic rocks as products mainly derived from the partial melting of Neoarchean basaltic rocks in the lower crust due to the basaltic magmas underplating in Mesozoic time.

Original languageChinese
Pages (from-to)3287-3297
Number of pages11
JournalActa Petrologica Sinica
Volume25
Issue number12
Publication statusPublished - 2009
Externally publishedYes

Keywords

  • Lanqi Formation
  • Late Jurassic
  • Partial melting of lower crust
  • Underplating
  • Western Liaoning Province
  • Zircon Hf istopes
  • Zircon U-Pb age

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