Deep magmatic processes of mafic layered intrusions in the Lala mining area, western Sichuan

SUN Junyi; LUO Zhaohua; CUI Jiawei

doi:10.12090/j.issn.1006-6616.2025028

Volume 31 Issue 4

Aug. 2025

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SUN J Y，LUO Z H，CUI J W，2025. Deep magmatic processes of mafic layered intrusions in the Lala mining area, western Sichuan[J]. Journal of Geomechanics，31（4）：740−754 doi: 10.12090/j.issn.1006-6616.2025028

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Deep magmatic processes of mafic layered intrusions in the Lala mining area, western Sichuan

doi: 10.12090/j.issn.1006-6616.2025028

SUN Junyi^{1, 2
,},
LUO Zhaohua³,
CUI Jiawei⁴

1.
Geoscience Documentation Center, China Geological Survey, Beijing 100083, China
2.
National Geological Library of China, Beijing 100083, China
3.
Department of Earth Science and Mineral Resources, China University of Geosciences (Beijing), Beijing 100083, China
4.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

Funds: This work is financially supported by the China Geological Survey Projects of the China Geological Survey (Grant Nos. DD20230139 and DD20221794), the National Key Basic Research Program of China (973 Program) (Grant No. 2011CB808901), and the National Natural Science Foundation of China (Grant No. 41702216).

More Information

Received: 2025-03-20
Revised: 2025-07-09
Accepted: 2025-07-15

Available Online: 2025-07-23

Published: 2025-08-28

Abstract

Abstract

Objective Previous studies have shown that many layered intrusions are formed by multiple pulsations of magma. However, little research has been done on whether the magma involved in the pulsation process comes from a single magma chamber or multiple magma chambers. Minerals, as products of magmatism, record the properties of magma chambers and deep magmatism. Methods Through the electron probe microanalysis technique (EPMA) on the hornblende and mica, combined with genetic analysis, mineral classification, and thermodynamic calculation, five different lithofacies zones of mafic layered intrusions in the western Sichuan LaLa mining area were studied. Results It shows that hornblende and mica of five different facies lithofacies zones formed in different stages of magmatism, with changes in the property of the magma chamber during crystallization. Conclusion There were at least two magma chambers with different properties in the deep layers during the formation of mafic layered intrusions. The layered intrusions were formed through multiple (4–5) magmatic pulsations, activated by fluid overpressure, which mobilized two magma chambers of differing compositions and depths.
- mafic layered intrusion,
- hornblende,
- mica,
- magmatism,
- deep processes

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