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Triassic calc-alkaline lamprophyre dykes from the North Qiangtang, central Tibetan Plateau: evidence for a subduction-modified lithospheric mantle

Published online by Cambridge University Press:  24 November 2021

Bin Liu*
Affiliation:
School of Geosciences, Yangtze University, Daxue Road 111, Wuhan 430100, China State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Fuxue Road 18, Beijing 102249, China
You-Jun Tang
Affiliation:
College of Resources and Environment, Yangtze University, Daxue Road 111, Wuhan 430100, China
Lü-Ya Xing
Affiliation:
College of Resources and Environment, Yangtze University, Daxue Road 111, Wuhan 430100, China
Yu Xu
Affiliation:
School of Geosciences, Yangtze University, Daxue Road 111, Wuhan 430100, China State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Fuxue Road 18, Beijing 102249, China
Shao-Qing Zhao
Affiliation:
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Fuxue Road 18, Beijing 102249, China State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Lumo Road 388, Wuhan 430074, China
Yang Sun
Affiliation:
School of Geosciences, Yangtze University, Daxue Road 111, Wuhan 430100, China State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Fuxue Road 18, Beijing 102249, China
Jian Huang
Affiliation:
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Lumo Road 388, Wuhan 430074, China
*
Author for correspondence: Bin Liu, Email: binliu@yangtzeu.edu.cn

Abstract

Primitive lamprophyres in orogenic belts can provide crucial insights into the nature of the subcontinental lithosphere and the relevant deep crust–mantle interactions. This paper reports a suite of relatively primitive lamprophyre dykes from the North Qiangtang, central Tibetan Plateau. Zircon U–Pb ages of the lamprophyre dykes range from 214 Ma to 218 Ma, with a weighted mean age of 216 ± 1 Ma. Most of the lamprophyre samples are similar in geochemical compositions to typical primitive magmas (e.g. high MgO contents, Mg no. values and Cr, with low FeOt/MgO ratios), although they might have experienced a slightly low degree of olivine crystallization, and they show arc-like trace-element patterns and enriched Sr–Nd isotopic composition ((87Sr/86Sr)i = 0.70538–0.70540, ϵNd(t) = −2.96 to −1.65). Those geochemical and isotopic variations indicate that the lamprophyre dykes originated from partial melting of a phlogopite- and spinel-bearing peridotite mantle modified by subduction-related aqueous fluids. Combining with the other regional studies, we propose that slab subduction might have occurred during Late Triassic time, and the rollback of the oceanic lithosphere induced the lamprophyre magmatism in the central Tibetan Plateau.

Type
Original Article
Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Triassic calc-alkaline lamprophyre dykes from the North Qiangtang, central Tibetan Plateau: evidence for a subduction-modified lithospheric mantle
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