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Geochemistry and the Tectonic Setting of Early Tertiary Volcanic Rocks in the East Depression,Liaohe Basin(PDF)

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

Issue:
2009年第04期
Page:
368-375，417
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemistry and the Tectonic Setting of Early Tertiary Volcanic Rocks in the East Depression,Liaohe Basin
Author(s):
ZHANG Lian-chang1; 2;  CHEN Zhi-guang1; 2;  ZHOU Xin-hua1; 2;  WANG Fei1; 2;  ZHANG Yu-tao1; 2
(1. Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China; 2. Key Laboratory of Mineral Resources, Chinese Academy of Sciences, Beijing 100029, China)
Keywords:
early Tertiary;  volcanic rock;  geochemistry;  Sr-Nd isotope;  tectonic setting;  Liaohe basin
PACS:
P588.1;P595
DOI:
-
Abstract:
Frequent magmatic activity is one of the important characteristics for the Liaohe basin. The east depression in the Liaohe basin was covered with lower Tertiary volcanic rocks. The volcanic rocks are composed of basalt, dolerite and trachyte. The analysis of major and trace elements show that the volcanic rocks are characterized by high w(K2O+Na2O), high w(Al2O3)and w(MgO), enrichment of Light rare earth elements, no pronounced Eu anomaly(δEu=0.70～1.05)and weak negative Ti, P, Sr and Ta anomalies. These geochemical characteristics are similar to those of continental alkali basalt. Isotopic geochemistries show that values of ε</sub>Nd(t)and(N(87Sr)/ N(86Sr))i of the volcanic range from -2.8 to 2.8 and from 0.704 6 to 0.706 7, respectively. These geochemistries show that the basaltic magma was formed in partial melting of asthenosphere mantle. Based on above mentioned characteristics, combined with the regional researching results, we suggest that the east depression was very likely an extensional rift environment during the early Tertiary.

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Last Update: 2009-12-20