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Triassic shoshonitic dykes from the northern North China craton: petrogenesis and geodynamic significance

Published online by Cambridge University Press:  09 March 2011

LEBING FU*
Affiliation:
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
JUNHAO WEI
Affiliation:
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
TIMOTHY M. KUSKY
Affiliation:
State Key Laboratory of Geological Processes and Mineral Resources, Three Gorges Geohazard Research Centre, China University of Geosciences, Wuhan 430074, China
HUAYONG CHEN
Affiliation:
ARC Centre of Excellence in Ore Deposits, University of Tasmania, Tasmania 7001, Australia
JUN TAN
Affiliation:
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
YANJUN LI
Affiliation:
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
LINGJUN KONG
Affiliation:
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
YONGJIAN JIANG
Affiliation:
Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
*
Author for correspondence: [email protected]

Abstract

Zircon U–Pb ages, major and trace element geochemistry and Sr, Nd and Pb isotope compositions of diorite and diorite porphyry dykes from the Jinchanggouliang (JCGL) gold ore field on the northern margin of the North China craton (NCC) were studied to investigate their sources, petrogenesis and geodynamic significance. LA-ICP-MS zircon U–Pb dating reveals three major age groups of 2500 Ma (n = 2), 253 ± 7 Ma (n = 5) and 227 ± 1 Ma (n = 9). The inherited ages of 2500 Ma, contemporary with the Archaean NCC continental growth, imply that crustal material was involved in the magma source. The igneous zircons with a concordia age of 227 ± 1 Ma may record the emplacement age of the JCGL dykes. Both diorite and diorite porphyry exhibit a wide range of SiO2 and MgO contents and are characterized by high concentrations of Na2O+K2O and Al2O3, and low abundances of P2O5 and TiO2. They are enriched in large ion lithophile elements and light rare earth elements without significant Eu anomalies, and depleted in high-field-strength elements; all are categorized as shoshonitic rocks. All samples show a narrow range of Sr isotope compositions with initial 87Sr/86Sr ratios from 0.70394 to 0.70592, variable εNd(t) values (1.1 to −12.0) and TDM2 ages of 913–1972 Ma. Their Pb isotope compositions form continuous variation trends and plot in the fields between enriched mantle 1 (EM1) and lower continental crust (LCC). The above results suggest that the JCGL dykes studied could have been derived from mixing of lower crust, lithospheric mantle of the NCC and ascending asthenospheric melt in a post-orogenic extensional geodynamic setting. These shoshonitic dykes, together with the geochronological data of regional ENE-trending retrograded eclogites, ophiolites, continental arc magmatic belt, A-type granite, alkaline intrusions and metamorphic core complex from the northern NCC and Central Asian Orogenic Belt (CAOB) suggest that closure of the Palaeo-Asian Ocean (i.e. stage of pre-collision to collision) had completed during latest Permian to earliest Triassic time, and that the CAOB was subsequently tectonically dominated by post-orogenic extensional regimes. The involvement of asthenospheric melt in the magma source implies that the sub-continental lithospheric mantle (SCLM) of the NCC had been modified, and the onset of lithospheric destruction and thinning beneath the northern NCC may have occurred in Middle–Late Triassic time as a result of post-orogenic subducting slab detachment and lithospheric delamination.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 2011

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