Phyllic alteration is a hydrothermal alteration zone in a permeable rock that has been affected by circulation of hydrothermal fluids. It is commonly seen in copper porphyry ore deposits in calc-alkaline rocks. Phyllic alteration is characterised by the assemblage of quartz + sericite + pyrite, and occurs at high temperatures and moderately acidic (low pH) conditions.
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| - Alterasi filik (in)
- Phyllic alteration (en)
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| - Phyllic alteration is a hydrothermal alteration zone in a permeable rock that has been affected by circulation of hydrothermal fluids. It is commonly seen in copper porphyry ore deposits in calc-alkaline rocks. Phyllic alteration is characterised by the assemblage of quartz + sericite + pyrite, and occurs at high temperatures and moderately acidic (low pH) conditions. (en)
- Alterasi filik adalah zona alterasi hidrotermal di bautan permeabel yang telah dipengaruhi oleh sirkulasi dari Fludia hidrotermal . Alterasi ini umumnya terlihat di Endapan bijih tembaga di batuan kalk-alkalin. Alterasi filik dicirikan oleh susunannya yang terdiri dari kuarsa + serisit + , dan hanya terjadi pada suhu tinggi dan cukup asam (pH rendah). (in)
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| - Phyllic alteration is a hydrothermal alteration zone in a permeable rock that has been affected by circulation of hydrothermal fluids. It is commonly seen in copper porphyry ore deposits in calc-alkaline rocks. Phyllic alteration is characterised by the assemblage of quartz + sericite + pyrite, and occurs at high temperatures and moderately acidic (low pH) conditions. Hydrogen-ion metasomatism is the process that causes phyllic alteration. While the mineralogy of the rock is altered throughout, texture is preserved and primary porphyry structure (including position of original veins) may still be visible. If a rock undergoes phyllic alteration, then orthoclase feldspar, biotite and various silicates are altered in addition to plagioclase. Plagioclase will be altered to sericite (a fine-grained white mica) by sericitic alteration, and mafic minerals are replaced by quartz. Tourmaline may appear as radiating aggregate or prismatic crystals between the quartz-sericite assemblage. Phyllic alteration is often closely associated with argillic alteration, which occurs at lower temperatures and dominantly affects plagioclase. (en)
- Alterasi filik adalah zona alterasi hidrotermal di bautan permeabel yang telah dipengaruhi oleh sirkulasi dari Fludia hidrotermal . Alterasi ini umumnya terlihat di Endapan bijih tembaga di batuan kalk-alkalin. Alterasi filik dicirikan oleh susunannya yang terdiri dari kuarsa + serisit + , dan hanya terjadi pada suhu tinggi dan cukup asam (pH rendah). Metasomatisme Hidrogen-ion adalah proses yang menyebabkan alterasi filik . Meski mineralogi dari batuan terubah, tekstur batuan asal tetap terawetkan dan struktur porfiri utama (termasuk posisi asli urat-urat) mungkin masih akan terlihat. Jika batuan mengalami alterasi filik, maka felspar ortoklas, biotit, dan bermacam-macam silikat juga berubah sebagai tambahan untuk plagioklas. Plagioklas sendiri akan terubah menjadi serisit (mika putih berbutir halus) akibat ,dan mineral-mineral mafik akan digantikan oleh kuarsa. Tourmalin mungkin tampak sebagai agregat yang memancar atau tampak seperti kristal-kristal prismatik antara susunan kuarsa-sericit . Alterasi filik sering berasosiasi dengan alterasi argilik, yang terjadi di temperatur yang lebih rendah dan lebih dominan dalam memengaruhi plagioklas. (in)
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