کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4717936 | 1638779 | 2006 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Marginal mafic intrusions as indicators of downslope draining of dense residual melts in anorthositic diapirs?
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موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Marginal mafic intrusions as indicators of downslope draining of dense residual melts in anorthositic diapirs? Marginal mafic intrusions as indicators of downslope draining of dense residual melts in anorthositic diapirs?](/preview/png/4717936.png)
چکیده انگلیسی
Calculated densities of primitive jotunites (2.73-2.74 at FMQ, 0.15% H2O, 200 ppm CO2, 435 ppm F, 1150 °C, 3 kb) and evolved jotunites (2.75-2.76 at FMQ, 0.30% H2O, 400 ppm CO2, 870 ppm F, 1135 °C, 3 kb) demonstrate that they are much denser than the plagioclase of the surrounding anorthositic crystal mush (2.61-2.65). Efficient migration and draining of dense residual melts through the anorthositic crystal mush could have taken place along sloping floors (zones of lesser permeability in the mush), which occur along the margins of the rising anorthositic diapirs. This process takes into account the restricted occurrence of the mafic intrusions in the margins of the massif anorthosites. In a later stage, when the anorthosite was nearly consolidated, the residual melts were more differentiated (evolved jotunites) and could have been extracted into extensional fractures in the cooling and contracting anorthositic body in a similar way as aplitic dikes are emplaced in granitic plutons. As in the Rogaland Anorthositic Province, these dikes are much more abundant than the small mafic intrusions, collection and transport along dikes was probably more efficient than draining through the crystal mush.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Lithos - Volume 89, Issues 3â4, July 2006, Pages 329-352
Journal: Lithos - Volume 89, Issues 3â4, July 2006, Pages 329-352
نویسندگان
Jacqueline Vander Auwera, Dominique Weis, Jean Clair Duchesne,