alteración propilítica
English translation: propylitic alteration
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| 02:24 Jul 22, 2006 |
| Spanish to English translations [PRO] Tech/Engineering - Geology | |||||||
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|  Selected response from: Oso (X) | ||||||
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| 4 | propylitic alteration |
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| 4 | propylitic alteration |
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Answers
37 mins confidence: 
propylitic alteration Explanation: Propylitic alteration turns rocks green, because the new minerals formed are green. These minerals include chlorite, actinolite and epidote. They usually form from the decomposition of Fe-Mg-bearing minerals, such as biotite, amphibole or pyroxene, although they can also replace feldspar. Propylitic alteration occurs at relatively low temperatures. Propylitic alteration will generally form in a distal setting relative to other alteration types. Reference: http://www.dmtcalaska.org/course_dev/explogeo/class08/notes0... |
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37 mins confidence:
propylitic alteration Explanation: Buena suerte y saludos del Oso ¶:^) -------------------------------------------------- Note added at 44 mins (2006-07-22 03:08:53 GMT) -------------------------------------------------- Más ejemplos: 1.) "...The outermost zone, called “propylitic”, is characterized by the assemblage quartz-chlorite-carbonate and locally containing epidote, albite or adularia. Epithermal deposits associated with major structures (faults or fractures) have linear zones which parallel the structure. The mineralogy is highly variable, as is the geometry. One example of alteration zoning associated with a volcanic vent is shown in Figure 8 – 1 B. This example indicates an inner zone of silicification forms within a central breccia formation, and an outer zone of ****propylitic alteration**** lies adjacent. Sericite is a common alteration mineral formed in zones along fault structures or fault zones in low to moderate temperature settings. ..." http://www.dmtcalaska.org/course_dev/explogeo/class08/notes0... 2.) "...***PROPYLITIC ALTERATION***: Propylitic alteration is usually found in the outer zones of epithermal gold and copper porphyry deposits. It is readily distinguished from more argillized alteration types by the occurrence (commonly) of chlorite, epidote, smectite and carbonate (usually calcite), and may contain an amphibole such as actinolite. Zeolites may also be present. Example spectra are shown in Figure 2: (A) actinolite, (B) tremolite, (C) calcite (D) montmorillonite, (E) nontronite, (F) clinoptilolite, (G) epidote , (H) Mg-chlorite, and (I) Fe-chlorite. Cation substitution, especially aluminum, magnesium and iron, can be spectrally tracked. Note the spectral shifts and profile changes between the chlorites and the smectites. ..." http://www.pimausa.com/alt_syst.html En Google: Results 1 - 10 of about 22,800 for "propylitic alteration" Reference: http://www.webref.org/geology/p/propylitic_alteration.htm |
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