The evolving rift belt—Wudalianchi volcanic rock belt

Earth Science Frontiers ›› 2008, Vol. 15 ›› Issue (6): 241-250.

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The evolving rift belt—Wudalianchi volcanic rock belt

1The Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education; School of Earth and Space Sciences, Peking University, Beijing 100871, China
2Institute of Geology and Geophysics; Key Laboratory of Mineral Resources, Institute of Geology and Geophysics, Chinese Academy of Science, Beijing 100029, China
3Department of Earth Sciences, Nanjing University, Nanjing 210093, China

Online:2008-06-20 Published:2008-06-20

Abstract

Abstract:

The XiaoguliheKeluoWudalianchiErkeshan Cenozoic volcanic rock belt is one rich in potassium. Four facts about this belt are analyzed in this work：(1) typical mantle metasomatism existing in the volcanic rocks and in their inclusions, (2) the distribution range of the Krich volcanic belt estimated according to the K2O/Na2O ratio of the volcanic rocks, (3) the “cold spring and taele phenomenon” caused by adiabatic expansion of the mantle gases, and (4) the current situation of seismic activities. It is inferred from those facts that the NNWstrike Wudalianchi volcanic rock belt is a Cenozoic primal continental rift cutting through the NNEstrike DaHingganMt. tectonic belt. The evolution tendency of its magma suggests that the Wudalianchi rift belt is still in a course of continuing evolution without a sign of coming to an end.

Key words:

Cenozoic; Krich volcanic belt; continental rift; seismic activity; magmatic evolution

CLC Number:

SHAO Ji-An ZHANG Wen-Lan. The evolving rift belt—Wudalianchi volcanic rock belt[J]. Earth Science Frontiers, 2008, 15(6): 241-250.

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The evolving rift belt—Wudalianchi volcanic rock belt

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