期刊
JOURNAL OF METAMORPHIC GEOLOGY
卷 34, 期 7, 页码 663-682出版社
WILEY-BLACKWELL
DOI: 10.1111/jmg.12199
关键词
anatexis; decompression melting; melt loss; Rcrust; thermodynamic modelling
类别
资金
- South African National Research Foundation (NRF) through the Scare Skills Bursary
- South African Research Chairs Initiative (SARChl)
- European Research Council (project MASE) [ERC StG 279828]
- European Union FP7 Marie Curie Initial Training Network Topomod [264517]
Earth's continental crust is stabilized by crustal differentiation that is driven by partial melting and melt loss: Magmas segregate from their residuum and migrate into the upper crust, leaving the deep crust refractory. Thus, compositional change is an integral part of the metamorphic evolution of anatectic granulites. Current thermodynamic modelling techniques have limited abilities to handle changing bulk composition. New software is developed (Rcrust) that via a path-dependent iteration approach enables pressure, temperature and bulk composition to act as simultaneous variables. Path-dependence allows phase additions or extractions that will alter the effective bulk composition of the system. This new methodology leads to a host of additional investigative tools. Singular paths within pressure-temperature-bulk composition (P-T-X) space give details of changing phase proportions and compositions during the anatectic process, while compilations of paths create path-dependent P-T mode diagrams. A case study is used to investigate the effects of melt loss in an open system for a pelite starting bulk composition. The study is expanded upon by considering multiple P-T paths and considering the effects of a lower melt threshold. It is found that, for the pelite starting composition under investigation, open systems produce less melt than closed systems, and that melt loss prior to decompression drastically reduces the ability of the system to form melt upon decompression.
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