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Structural Geochemical Study of the Yuxi Fold-Thrust Belt in the Southern North China Plate
作者姓名:李文勇  夏斌  李东旭
作者单位:School of Earth Sciences and Resources China University of Geosciences,CAS Key Laboratory of Marginal Sea Geology Guangzhou Institute of Geochemistry,School of Earth Sciences and Resources China University of Geosciences,Beijing 100083 China,Guangzhou Marine Geological Survey Ministry of Land and Resources Guangzhou 510760 China,Guangzhou 510640 China,Beijing 100083 China
基金项目:This paper is supported by the Key Basic Research Project funded by theChinese Academy of Sciences (No . KZCX2-SW-117) .
摘    要:The gigantic fold-thrust fracture belt that ex-tends for 900 kmto the NWin the southern NorthChina plate strides across three provinces : Shaanxi ,Henan and Anhui .It is one of the most characteristicstructural deformations in the North China plate .Along this structural belt a series of i mportantcoalfields occur ( e . g. Pingdingshan, Queshan,Huainan) inthe southernmost edge of the North Chi-na coal-concentrating basin. Consequently ,this beltis not only of key value for research onthe…

关 键 词:地球化学  裂带  豫西  地质结构
收稿时间:2005-12-05

Structural Geochemical Study of the Yuxi Fold-Thrust Belt in the Southern North China Plate
Li Wenyong,Xia Bin,Li Dongxu.Structural Geochemical Study of the Yuxi Fold-Thrust Belt in the Southern North China Plate[J].Journal of China University of Geosciences,2006,17(2):95-102.
Authors:Li Wenyong  Xia Bin  Li Dongxu
Institution:1. DII, University of Pisa, via G. Caruso 16, 56122 Pisa, Italy;2. ams Italy S.r.l., Via Giuntini 13, 56023 Navacchio (Pisa), Italy
Abstract:The Yuxi (豫西) fold-thrust fracture belt is part of the gigantic fold-thrust fracture belt that extends NW in the southern North China plate. The contents of major elements of tectonites were analyzed by ICP-AES. The analysis of chemical compositions and new stress minerals indicates: extending from the surrounding country rocks to the center of the fracture belt, the Fe2 O3 content gradually increases while the FeO content gradually decreases; regular increase, decrease or peak changes are shown for chemical compositions likeSiO2, Al2O3, Fe2O3, MgO, CaO, FeO, loss on ignition, TiO2,K2O, Na2O, etc.. New stress minerals are developed for the south branch and few for the north branch.The characteristics of chemical compositions and new stress minerals of the thrust fracture demonstrate that the fracture belt has undergone a process from a closed reducing environmental system to a relatively open, oxidizing environmental system, and compressive fractures have resulted from compression in the late stages of evolution, and the dynamothermal metamorphism and thrusting intensities are different between the south and north branches of the belt, which is strong for the south branch but relatively weak for the north branch.
Keywords:structural geochemistry  thrust fracture belt  Yuxi  southern North China plate  
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