Volcanic activity process and petrogenesis of the Liaotianshan caldera in SW Fujian: Evidence from zircon U-Pb, Hf isotopic and trace element concentrations

被引：0

作者：

Liu L. ^{[1
]}

Zhao Y. ^{[1
]}

He Z. ^{[2
]}

Sun J. ^{[1
]}

Liu X. ^{[1
]}

Zhao Z. ^{[1
]}

机构：

[1] Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin University of Technology, Guangxi, Guilin

[2] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 07期

关键词：

Liaotianshan caldera; magma system evolution; SE China; volcanic activity process; zircon;

D O I：

10.19762/j.cnki.dizhixuebao.2023133

中图分类号：

学科分类号：

摘要：

Volcanoes are the only straightforward expression for the activity of magma on Earth's surface. Ancient volcanoes could expose multi-stage eruptive products, magma plumbing systems and even the magma reservoirs. Therefore, they could preserve important information on interior structure of magma reservoir and magmatic evolution. Zircons can record crystallization differentiation, crystal-melt separation, and replenishment processes of magma system. In this work, we conducted zircon U-Pb, Lu-Hf isotopic and trace element concentration studies on the late Jurassic Liaotianshan caldera in southwest Fujian Province, which is one of the earliest and best preserved Late Mesozoic calderas in SE China, to reveal its eruptive history, magma source and evolution process. The Liaotianshan volcano started to erupt intermittently at ca. 161. 5 + 0. 7 Ma as the first stage with limited scales of eruptive products, then during 159. 9 + 0. 9 -156. 9 + 0. 8 Ma erupted as the second stage forming the main part of the caldera. At the final stage, magma extruded along the magma conduit forming porphyritic rhyolite domes at ca. 153. 2 + 0. 7 Ma, marking the end of the eruption. Zircon Lu-Hf isotopic compositions show that, the Liaotianshan volcanic rocks were derived mainly from partial remelting of the Paleoproterozoic crustal basement, with decreasing and then increasing degree of depleted mantle-derived involvement. Different batches of magma raised separately from source region after magma mixing in deep reservoir, and then retained briefly in shallow reservoir with similar crystallization process. The change of magma origin together with volcanic lithofacies indicate that the Liaotianshan caldera formed under a slightly compressional and then depressional geological environment, plausibly corresponding to the paleo-Pacific subduction with varying subduction angle during Late Jurassic. © 2023 Geological Society of China. All rights reserved.

引用

页码：2176 / 2194

页数：18

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