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.

中文翻译：

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Titanite：花岗岩岩浆系统的潜在固相线晴雨表

在各种地球动力学环境中限制花岗岩的结晶压力和侵入深度仍然具有挑战性，但对于进一步了解岩浆系统和地壳演化很重要。我们建议钛白石是金属铝质和弱过铝质花岗岩中的常见附件，如果它在岩浆、近固相线条件下结晶并与角闪石、斜长石、钾长石、石英、黑云母和磁铁矿±钛铁矿。Titanite Al2O3 根据压力 (P) 增加：P (in MPa) = 101.66 × Al2O3 in Titanite (in wt%) + 59.013 (R2 = 0.83) 估计不确定性为 ~±60 到 ~±100 MPa 之间的结晶150 和 400 兆帕。我们强调当前的校准数据集是有限的，并且需要系统的实验研究来严格量化这种关系。这种经验气压计最重要的用途是用于存在闪石但显着改变的岩石，或者与闪石气压计结合使用，因为钛铁矿可以很容易地通过 LA-ICP-MS 确定年代。