Deep magmatic processes of mafic layered intrusions in the Lala mining area, western Sichuan
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摘要:
既往研究表明，许多层状岩体是由岩浆多次脉动作用形成的，但参与脉动过程的岩浆来源（单一或多个岩浆房）仍缺乏系统的研究。矿物作为岩浆作用过程中的产物，记录着岩浆房的性质和深部岩浆的作用过程。通过对川西拉拉矿区含矿镁铁质层状岩体5个不同岩相带中的角闪石、云母斑晶开展电子探针成分剖面分析，结合矿物成因分析、矿物分类以及热力学计算，认为其形成于岩浆作用的不同阶段，结晶过程中岩浆房性质发生了改变；镁铁质层状岩体形成过程中，深部最少有2种不同性质的岩浆房；层状岩体是由岩浆在流体超压作用下，激活2个不同性质及深度的岩浆房，经过多次（4~5次）的岩浆脉动作用所形成。
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.
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Key words:
- mafic layered intrusion /
- hornblende /
- mica /
- magmatism /
- deep processes
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图 9 YWS-1 相带— YWS-5相带云母成因判别图解（Foster，1960）
Figure 9.
图 10 云母Fe3+−Fe2+−Mg2+三元图解（David and Hans，1965）
Figure 10.
表 1 9个岩相带的岩石学特征一览表
Table 1. Petrological characteristics for nine lithofacies zones
岩相带 岩石类型 岩相学描述 接触关系 典型特征 YWS-1、YWS-9 煌斑岩 显微斑状结构，显微斑晶为角闪石（4%）、黑云母（3%）和Fe-Ti氧化物（5%）；基质成分为方解石（20%）、角闪石（16%），黑云母（22%）、高岭石（5%）、沸石（5%）；斜长石（20%），未分斑晶与基质；含少量硫化物 结构与YWS-2不同，二者呈侵入接触关系 发育球粒构造 YWS-2、YWS-8 煌斑岩 显微斑状结构，显微斑晶为角闪石（3%）、黑云母（3%）和Fe-Ti氧化物（8%）；基质成分为方解石（15%）、角闪石（12%）、黑云母（22%）、高岭石（5%）、沸石（5%）等；斜长石（25%），未分斑晶与基质；含少量硫化物 与YWS-3和 YWS-1间可见明显的结构分层，与YWS-3对比更强烈 发育球粒状沸石、方解石 YWS-3、YWS-7 辉长岩 显微斑状结构，显微斑晶主要为辉石（15%）、角闪石（10%）、黑云母（6%）、斜长石（5%）和Fe-Ti氧化物（6%）；基质成分主要为方解石（10%）、白云石（9%）、角闪石（14%）、黑云母（15%）、高岭石（5%）、沸石（5%）；含少量硫化物 与YWS-4和YWS-2间可见明显的结构分层 发育大颗粒辉石斑晶 YWS-4、YWS-6 辉长岩 显微斑状结构，显微斑晶主要为角闪石（4%）、黑云母（5%）、辉石（4%）和Fe-Ti氧化物（6%）；基质主要为方解石（15%）、斜长石（20%）、角闪石（11%）、黑云母（30%）高岭石（5%）等；含少量硫化物 与YWS-5和YWS-3结构分层明显 发育小颗粒辉石、大颗粒方解石 YWS-5 含磁铁矿辉长岩 显微斑状结构，显微斑晶主要为钾长石（5%）、白云母（10%）、石英（15%）和Fe-Ti氧化物（20%）；基质主要为方解石（5%）、高岭石（5%）、云母（20%）、钠长石（15%）和磷灰石（5%） 与YWS-4和YWS-6结构分层均十分清晰 发育白云母、石英、大量Ti-Fe氧化物 
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