مدملكات

مدملكات في جبال الرابطة بشبه جزيرة سيتوبال، البرتغال

المدملكات أو الجذاذ أو البريشة (Breccia) نوع من حجر الحصى، تمتاز بحبيباتها المزواة.[1][2][3] وهي أقل أنواع صخور الحصى شيوعاً. وغالباً ما توجد برفقة الفوالق وتدعى بالمدملكات التكتونية (tectonic breccias)، وكذلك في ركام الأنهيارات الصخرية (screes) وتدعى (scree breccia).

تختلف عن صخور الرواهص بأن حبيباتها حادة الزوايا وهذا يدل على أن الصخر ترسب بالقرب من مصدره الأصلي ( قلة نقلها عبر مسافات كبيرة ) وبذلك يلم يتعرض للكثير من الاحتكاك وله نفس المواد اللاحمة.

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مراجع

  1. ^ Mitcham، T. W. (1974). "Origin of breccia pipes". American Journal of Science. ج. 69 ع. 3: 412–413. DOI:10.2113/gsecongeo.69.3.412.
  2. ^ Glossary of Meteoritical Terms. Meteorlab.com. Retrieved on 2011-06-22. نسخة محفوظة 21 ديسمبر 2017 على موقع واي باك مشين.
  3. ^ Michel Jébrak (1997). "Hydrothermal breccias in vein-type ore deposits: A review of mechanisms, morphology and size distribution". Ore Geology Reviews. ج. 12 ع. 3: 111–134. DOI:10.1016/S0169-1368(97)00009-7.
في كومنز صور وملفات عن Breccia.
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