Geochemistry of volcanic rocks, Albernoa area, Iberian Pyrite Belt, Portugal

被引:28
|
作者
Rosa, DRN
Inverno, CMC
Oliveira, VMJ
Rosa, CJP
机构
[1] Inst Geol & Mineiro, P-2720866 Amadora, Portugal
[2] Inst Geol & Mineiro, P-7802491 Beja, Portugal
[3] CREMINER, P-1749016 Lisbon, Portugal
关键词
D O I
10.2747/0020-6814.46.4.366
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Volcanic rocks from the Albernoa area essentially consist of calcalkaline quartz-feldspar-phyric coherent and hyaloelastic rhyodacites, and alkaline and tholeiitic basaltic rocks. Binary plots show that high-field-strength elements behaved as immobile elements, and allow for the identification of two felsic rock suites. Silica and alkali mobility, however, is reflected by compositional scatter on major-element diagrams: felsic rocks display rhyolitic to apparent andesitic compositions, and the mafic rocks display basaltic to apparent dacitic compositions. Silica and alkali mobility was focused along fracture networks and within the matrices of hyaloelastic breccias. Problematic classification of geotectonic setting for the felsic rocks is a reflection of anomalous high-field-strength element systematics; this probably results from a low temperature of crustal fusion, causing decreased solubility of the refractory phases in which these elements reside. The mafic rocks, however, evidently were generated in an extensional setting without involvement of subduction; the existence of apparent are signatures was caused by crustal assimilation. This is compatible with volcanism in an attenuated continental lithosphere setting, due to strike-slip tectonics during oblique continental collision.
引用
收藏
页码:366 / 383
页数:18
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