Recent Progress in HP-UHP Metamorphic Tourmaline Research
详细信息
- 责任者：Yang Xin (School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Zhang Lifei
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2013
- 卷期：32(2)
- 页码：p.251-259
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
摘要
The recent research on HP-UHP metamorphic tourmaline is summarized in this paper.Tourmaline is a common mineral existent in sedimentary,igneous and metamorphic rocks.A variety of experiments demonstrate that this mineral can be stable in an exceptionally large p-t range,i.e.at p-t conditions >850℃ and >4 GPa.Owing to the low volume diffusion,the preservation of growth zones in tourmaline has become an effective key to investigating the boron evolution in rocks,the fluid-chemical history and the metamorphism of rocks.The research on the structure and chemistry of tourmaline reveals that components,such as Al and F are correlated with the formation temperature.According to different boron sources,the formation modes of HP-UHP tourmaline can be categorized into three types,i.e.,Type A,Type B and Type C.Based on the analyses of typical HP-UHP tourmaline in the world,the authors sum up the general characteristics of this mineral:① most HP-UHP tourmaline is dravite;② the crystallographic X-site is highly occupied(>0.8 pfu);③ excess B(3.2~3.3 pfu) is common;④ Ti,Mn,Li and Cl have low abundances;and ⑤ the δ11B values range from-16‰ to +1‰.As for future work on HP-UHP tourmaline,we should highlight the relationships between crystal chemistry and p-t conditions during its formation,the trace-element partitioning between tourmaline and fluids,and the phase equilibrium modeling for B-bearing mineral assemblages.