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Sr Isotopic Characteristics of Carbonate Rocks in Xinduqiao Formation of Xikang Group,Western Sichuan,China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2007年第02期
Page:
126-129
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Sr Isotopic Characteristics of Carbonate Rocks in Xinduqiao Formation of Xikang Group,Western Sichuan,China
Author(s):
ZENG Yi-jun12HUANG Si-jing1YI Tong-fu2 HAO Xue-feng2XIONG Chang-li2H U Zuo-wei1
1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China; 2. Sichuan Institute of Geological Survey, Chengdu 610081, Sichuan, China
Keywords:
western Sichuan Triassic System Xikang Group Sr isotope stratigraphy
PACS:
P53
DOI:
-
Abstract:
The Triassic black sandstone-slate from the Xinduqiao Formation of Xikang Group,is widely distributed in the Songpan-Ganzi region of western Sichuan. Its division and correlation are difficult because of the monotony of lithology and few of fossils. Based on the principle of strontium isotope stratigraphy(SIS), this paper measured the concentrations of Mn, Sr, SiO2, and the values of 87Sr/ 86Sr ratios for the carbonate rocks interbed in the black sandstone-slate of the Xinduqiao Formation, Xikang Group, northern Ganzi. The strontium isotope datum for the carbonate are 0. 708 688, 0.708 659, 0.708 907, 0.708 223, 0.708 341, 0.708 266 respectively, with an average of 0. 708 514. The carbonates underwent digenetic alteration in different degrees, leading 87Sr/ 86Sr ratios of most samples to have some departures to coeval seawater, but some of them contains the information of seawater geochemically. Therefore, the isotope datum can be used to correlate the strata and to calibrate the age of key position of Xinduqiao Formation of Xikang Group.

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Last Update: 1900-01-01