Доц. д-р Ирина Маринова
ABSTRACT
Изследването представя два типа на псевдоморфоза на плочест калцит (известна и като текстура на плочест кварц) в находище „Къклица”, разкриващи се на близка надморска височина, но разделени в пространството. Първият тип се явява под формата на тънки жилки, разкриващи се непосредствено над полегат разлом на отделяне. Представен е от кварц, псевдоромбичен адулар (10-20 об.%), рядък пирит и електрум с високи съдържания. Вторият тип присъства в стръмни жили, запълващи листрични разломи с ясни тектонски контакти. Той е развит на по-високо ниво от първия, също във висящото крило на разлома на отделяне. Представен е от кварц, псевдоромбичен адулар (1-2 об.%) и редки зърна пирит и електрум. Съставът на електрума от двата типа е различен: електрумът от първия тип има отношение Au/Ag над 3, а в електрума от втория тип това отношение е под 3. Първият тип на псевдоморфоза на плочест калцит е моделиран като първи хоризонт на кипене, с относително по-висока степен на кипене и по-ефективно отлагане на Au. Вторият тип може да бъде моделиран или като второ кипене на по-високо ниво от първото или като друг импулс на кипящ хидротермален разтвор. Той е образуван при по-ниска температура и показва по-ниска ефективност на отлагане на Au. Въз основа на литературни данни и данни от Крумовградското златорудно поле е заключено, че обичайното кипене не е достатъчно за ефективно отлагане на електрум в епитермални условия. За образуване на богати епитермални руди на благородни метали е необходимо почти пълно изпарение на летливите съединения в отворена хидротермална система.
Ключови думи
Крумовградско златорудно поле, електрум, калцит, адулар
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