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Geochemical Characteristics and Tectonic Implications of Karamaili Jiangbasitao Formation Volcanic Rock in Xinjiang(PDF)

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

Issue:
2011年第03期
Page:
237-245
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Geochemical Characteristics and Tectonic Implications of Karamaili Jiangbasitao Formation Volcanic Rock in Xinjiang
Author(s):
WANG Bang-yao1; JIANG Chang-yi1; 2; LI Yong-jun1; 2; WU Hong-en3
1. School of Earth Sciences and Resources, Chang'an University, Xi'an 710054, Shaanxi, China; 2. Key Laboratory of Western Mineral Resources and Geological Engineering of Ministry of Education, Chang'an University, Xi'an 710054, Shaanxi, China; 3. Xinjian
Keywords:
volcanic rock;  continental rift;  lithogeochemical;  Serpukhovian Stage;  Jiangbasitao Formation;  Karamaili;  Xinjiang
PACS:
P595
DOI:
-
Abstract:
Geochemical characteristic and the chart of tectonic of volcanic rocks and dating of high-precision geochronology in Karamaili Jiangbasitao Formation of Xinjiang were studied. The results showed that there were typical bimodal volcanic rocks of Jiangbasitao Formation, which included basalt-acid volcanolastic rock-basaltic trachyte andesite; LA-ICP-MS U-Pb zircon age of basaltic trachyte andesite was(319.8±2)Ma(weighted mean square deviation was 3), and indicated that the volcanic rocks of Jiangbasitao Formation formed in Serpukhovian Stage of Early Carboniferous. The study on geochemical characteristic of volcanic rocks showed that the rocks of Jiangbasitao Formation were composed of calc-alkaline series, high-K calc-alkaline series and shoshonite series; light rare earth element(REE)enriched patterns in chondrite-normalized REE diagram with no exception of Eu was shown in rocks; basalt and basaltic trachyte andesite were positive K anomaly and negative Sr anomaly, and acid volcanolastic rock were depleted in Nb, Ta and Ti. On the whole, the volcanic rocks of Jiangbasitao Formation were enriched in large ion lithophile elements, and depleted in high field strength element. Characteristics of basalt and basaltic trachyte andesite was continental rift valley(continental extension zone); characteristic of acid volcanolastic rock was arc or active continental margins. In general, the volcanic rocks of Jiangbasitao Formation formed in the post-collisional extension setting after Karamaili ocean basin closed, and there was post-collisional continent extension setting at the late stage of Early Carboniferous in Karamaili Region.

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Last Update: 2011-09-20