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Petrogenesis of high Ba-Sr plutons with high Sr/Y ratios in an intracontinental setting; evidence from Early Cretaceous Fushan monzonites, central North China Craton

Li Xiyao, Li Sanzhong, Huang Feng, Yong-Ming Wang, Yu Shengyao, Cao Huahua and Xie Weiming
Petrogenesis of high Ba-Sr plutons with high Sr/Y ratios in an intracontinental setting; evidence from Early Cretaceous Fushan monzonites, central North China Craton
Geological Magazine (December 2019) 156 (12): 1965-1981

Abstract

Geochronological, major and trace element, and Sr-Nd-Hf isotopic data are reported for the monzonitic rocks of the Fushan pluton in the Taihang Mountains, central North China Craton, in order to investigate their sources, petrogenesis and tectonic implications. Zircon U-Pb dating results reveal that the Fushan pluton was emplaced during the Early Cretaceous ( approximately 126-124 Ma). The monzonites and quartz monzonites are mainly characterized by calc-alkaline and magnesian features and display light rare earth element (LREE) enrichment and flat heavy REE (HREE) patterns with slightly positive Eu anomalies. They have similar whole-rock initial (super 87) Sr/ (super 86) Sr ratios (0.70653-0.70819), epsilon Nd(t) values (-13.6 to -18.6) and zircon epsilon Hf(t) values (-21.8 to -17.3). The primary magma of the Fushan pluton was derived from the partial melting of a spinel-facies amphibole-bearing ancient enriched lithospheric mantle. The monzonitic rocks also have high Ba-Sr and low Y and Yb contents, with high Sr/Y and La/Yb ratios. These geochemical features of monzonitic rocks are not only inherited from the magma source but also significantly enhanced by crystal fractionation during magmatic evolution; e.g. hornblende fractionation increased the Ba-Sr concentrations and Sr/Y ratios. During the Early Cretaceous, the slab sinking and roll-back of the Palaeo-Pacific Plate could have created an ancient big mantle wedge beneath East Asia and induced a lithospheric extensional process in the central North China Craton within an intracontinental setting.


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 156
Serial Issue: 12
Title: Petrogenesis of high Ba-Sr plutons with high Sr/Y ratios in an intracontinental setting; evidence from Early Cretaceous Fushan monzonites, central North China Craton
Affiliation: Ocean University of China, College of Marine Geosciences, Institute for Advanced Ocean Study, Laboratory of Submarine Geosciences and Prospecting Techniques, Qingdao, China
Pages: 1965-1981
Published: 201912
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 114
Accession Number: 2020-072629
Categories: Igneous and metamorphic petrologyGeochemistry of rocks, soils, and sediments
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch map
N36°40'00" - N36°46'00", E113°42'00" - E113°50'60"
Secondary Affiliation: China University of Geosciences, CHN, ChinaArizona State University, USA, United StatesHebei Institute of Geological Survey, CHN, China
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 2020
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