Average chemical compositions of post-Archean sedimentary and volcanic rocks from the Qinling orogenic belt and its adjacent North China and Yangtze cratons

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doi: 10.1016/0009-2541(91)90074-2
Authors:Gao Shan; Zhang Benren; Xie Qianli; Gu Xiaoming; Ouyang Jianping; Wang Dongpo; Gao Changling
Author Affiliations:Primary:
China Univ. Geosci., Dep. Geochem., Wuhan, China
Volume Title:Chemical Geology
Source:Chemical Geology, 92(4), p.261-282. Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0009-2541
Publication Date:1991
Note:In English. 49 refs.; illus. incl. 3,100 anals., 12 tables, strat. cols., geol. sketch map
Summary:The N China and Yangtze (S China) cratons are the most important tectonic units of China. The two cratons finally coalesced during the late Palaeozoic to Middle Triassic with formation of the E-W- trending Qinling-Dabie Mts. The average compositions are reported of 13 major, 16 trace and 14 REE of post-Archaean (arenaceous, pelitic and carbonate) and volcanic rocks (mafic with SiO2 <= 56% and felsic with SiO2 > 56) from the Qinling orogenic belt (including N and S Qinling) and the adjacent S margin of the N China craton and the N margin of the Yantze craton, as well as nine tectonostratigraphic subunits. The results are based on systematic sampling and analyses of > 3100 individual rock samples taken over an area of 153 200 km2. The average compositions of sedimentary and volcanic rocks of the study area generally compare well with published averages for corresponding rock types. Pb is a notable exception and is 1.5-3 times as high as the earlier estimates for sedimentary and mafic volcanic rocks. Also, the felsic volcanic rock has a bulk composition of quartz keratophyre with Na2O > K2O, which is in marked contrast with the rhyolitic composition for both average world- wide Tertiary-Recent orogenic and anorogenic felsic volcanic rocks. Although there are significant intra-unit chemical variations, persistent inter-unit distinctions are also evident, especially in major elements. [Authors' abstract] [P.Br.]
Subjects:Cenozoic; Chemical composition; Composition; Cratons; Geochemistry; Igneous rocks; Major elements; Mesozoic; Metals; Metamorphic rocks; Metasedimentary rocks; Metavolcanic rocks; Orogenic belts; Paleogene; Paleozoic; Precambrian; Proterozoic; Rare earths; Sedimentary rocks; Tectonostratigraphic units; Tertiary; Trace elements; Upper Precambrian; Volcanic rocks; Asia; China; Far East; Qinling Mountains; Shaanxi China; North China Craton; Shensi; Yangtze Craton
Abstract Numbers:92M/1750
Record ID:1991059874
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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