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《Geotectonica Et Metallogenia》 2008-04
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FOLD SHRINKAGE RESEARCH AND ITS SIGNIFICANCE OF MESOZOIC-CENOZOIC STRATUM OF QIANGTANG,THE HINTERLAND OF TIBET

MENG Yanning1,2,WANG Guocan1,2,WANG An1,2 and CAO Kai1,2(1.Faculty of Earth Sciences,China University of Geosciences,Wuhan 430074,Hubei,China;2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,Hubei,China)  
The Qiangtang Block in Tibetan Plateau which lies between the Bangong-Nujiang and Jinshajiang sutures is a Mesozoic sedimentary basin.Statistic analysis of fold shortening indicates a minimum value of 29.3% since Mesozoic,which is overall consistent with a value of 27.2% calculated by angels between fold wings.Convergence between the Indian and Eurasia plates yielded 429~500km north-south shortening in the study area,which was 58.8%~62.5%,while Neogene strata yield a maximum shortening of 31.6% by folding.It is thus suggested that faulting associated shortening is estimated as 27.2%~30.9%.Fold shortenings in different structure layer are estimated,in which Triassic,Paleocene-Eocene,Jurassic-Cretaceous,Oligecene and Neogene structure layers yield shortening of 29.3%,13.8%,23.2%,12.3% and 17.8%,respectively.It indicates that fold shortening increased postdate Neogene,which is consistent with the strengthened tectonic uplift of Tibetan Plateau in Neogene.The space-time distribution character of folds shrinkage of Qiangtan Block is consistent with the evolvement of uplift belt to some extent.
【Fund】: 中国地质调查局重大基础研究项目:青藏高原新生代地质作用过程与第四纪环境演变综合研究(项目号:1212010610103)
【CateGory Index】: P542
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