Titanite: A potential solidus barometer for granitic magma systems

IF 2 4区地球科学 Q3 GEOSCIENCES, MULTIDISCIPLINARY

Comptes Rendus Geoscience Pub Date : 2019-12-01 DOI:10.1016/j.crte.2019.09.002

Saskia Erdmann , Rucheng Wang , Fangfang Huang , Bruno Scaillet , Kai Zhao , Hongsheng Liu , Yan Chen , Michel Faure

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引用次数: 16

Abstract

Constraining crystallization pressure and thus intrusion depth of granites in various geodynamic settings remains challenging, yet important to further our understanding of magma system and crustal evolution. We propose that titanite, which is a common accessory in metaluminous and weakly peraluminous granites, can be used as a barometer if it crystallized in magmatic, near-solidus conditions and in equilibrium with amphibole, plagioclase, K-feldspar, quartz, biotite, and magnetite ± ilmenite. Titanite Al₂O₃ increases with pressure (P) according to: P (in MPa) = 101.66 × Al₂O₃ in titanite (in wt%) + 59.013 (R² = 0.83) with estimated uncertainties of ~±60 to ~±100 MPa for crystallization between ~150 and 400 MPa. We highlight that the current calibration dataset is limited, and that systematic experimental studies are needed to rigorously quantify the relation. The most important use of this empirical barometer will be for rocks in which amphibole is present but significantly altered, or in combination with amphibole barometry, as titanite can be easily dated by LA-ICP-MS.

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钛铁矿：花岗岩-岩浆系统的潜在固体晴雨表

在不同的地球动力学背景下，限制花岗岩的结晶压力和侵入深度仍然具有挑战性，但对进一步了解岩浆系统和地壳演化具有重要意义。我们认为，如果钛矿在岩浆、近固相条件下结晶，并与角闪洞、斜长石、钾长石、石英、黑云母和磁铁矿±钛铁矿处于平衡状态，则钛矿是铝质和弱过铝质花岗岩的常见附属物，可以用作气压计。钛矿Al2O3随压力(P)增大，P(单位MPa) = 101.66 × Al2O3在钛矿(单位wt%) + 59.013 (R2 = 0.83)，在~150 ~ 400 MPa之间结晶，估计不确定度为~±60 ~ ~±100 MPa。我们强调当前的校准数据集是有限的，需要系统的实验研究来严格量化这种关系。这种经验气压计的最重要用途将是用于存在角闪洞但变化明显的岩石，或与角闪洞气压计相结合，因为钛矿可以很容易地用LA-ICP-MS测定年代。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Comptes Rendus Geoscience 地学-地球科学综合

CiteScore

2.80

自引率

14.30%

发文量

审稿时长

5.9 weeks

期刊介绍： Created in 1835 by physicist François Arago, then Permanent Secretary, the journal Comptes Rendus de l''Académie des sciences allows researchers to quickly make their work known to the international scientific community. It is divided into seven titles covering the range of scientific research fields: Mathematics, Mechanics, Chemistry, Biology, Geoscience, Physics and Palevol. Each series is led by an editor-in-chief assisted by an editorial committee. Submitted articles are reviewed by two scientists with recognized competence in the field concerned. They can be notes, announcing significant new results, as well as review articles, allowing for a fine-tuning, or even proceedings of symposia and other thematic issues, under the direction of invited editors, French or foreign.