HP-LT Variscan metamorphism in the Cubito-Moura schists (Ossa-Morena Zone, southern Iberia)

被引：15

作者：

Booth-Rea, Guillermo ^{[1
]}

Simancas, Jose Fernando

Azor, Antonio

Azanon, Jose Miguel

Gonzalez-Lodeiro, Francisco

Fonseca, Paulo

机构：

[1] Univ Granada, Dept Geodinam, Granada 18071, Spain

[2] FCUL, Dept Geol, P-1700 Lisbon, Portugal

来源：

COMPTES RENDUS GEOSCIENCE | 2006年 / 338卷 / 16期

关键词：

Variscan Belt; Ossa-Morena Zone; HP-LT metamorphism; Fe3+; local equilibria's thermobarometry; Spain;

D O I：

10.1016/j.crte.2006.08.001

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Multi-equilibrium thermobarometry shows that low-grade metapelites (Cubito-Moura schists) from the Ossa-Morena Zone underwent HP-LT metamorphism from 340-370 degrees C at 1.0-0.9 GPa to 400-450 degrees C at 0.8-0.7 GPa. These HP-LT equilibriums were reached by parageneses including white K mica, chlorite and chloritoid, which define the earliest schistosity (SI) in these rocks. The main foliation in the schists is a crenulation cleavage (S-2), which developed during decompression from 0.8-0.7 to 0.4-0.3 GPa at increasing temperatures from 400-450 degrees C to 440-465 degrees C. Fe3+ in chlorite decreased greatly during prograde metamorphism from molar fractions of 0.4 determined in syn-S-1 chlorites down to 0.1 in syn-S-2 chlorites. These new data add to previous findings of eclogites in the Moura schists indicating that a pile of allochtonous

引用

页码：1260 / 1267

页数：8

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