Garnet-pyroxene thermometry and barometry in the Scourie granulites,NW Scotland期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

按检索

Garnet-pyroxene thermometry and barometry in the Scourie granulites,NW Scotland

Authors:	Hugh R Rollinson

Institution:	Department of Earth Sciences, The University, Leeds LS2 9JT, United Kingdom

Abstract:	Garnets and pyroxenes from granulites ranging in composition from trondhjemitic to ultramafic were analysed with the electron probe in order to test current geothermometric and geobarometric models. A consistent pressure and temperature estimate based on garnet-pyroxene equilibria shows that the peak of metamorphism was at $820±50° C$ and 11 kb and implies a minimum crustal thickness of 30 km and a maximum geothermal gradient of 25–28°C, km^?1, at 2700 Ma in the Scourie area. These results are in contrast to earlier more extreme P-T estimates of $1150±100° C and 15±3 kb$ .

Keywords:
本文献已被 ScienceDirect 等数据库收录！