Prospection for copper mineralization with contribution of remote sensing, geochemical and mineralographical data in Abhar 1:100,000 sheet, NW Iran

• Autorzy: Nouri R. , Jafari M. , Arian M. , Feizi F. , Afzal P.

Warianty tytułu

PL

Poszukiwania zasobów rud miedzi z zastosowaniem zdalnych technik wykorzystujących dane geochemiczne i mineralogiczne w pokładzie geologicznym Abhar 1:100,000 w północno-zachodnim Iranie

• Języki publikacji: EN

Abstrakty

EN

Abhar 1:100,000 sheet is located within the Cenozoic Tarom volcano-plutonic belt, NW Iran. The present study is based on the integration of remote sensing techniques on Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), geochemical data analysis consisting of stream sediment and lithogeochemical samples, within geological field observations and mineralographical studies to identify Cu prospect. On ASTER data; using a number of selected methods including band ratio, Least Square Fit (LS-Fit) and Minimum Noise Fraction (MNF) distinguished alternation zones. These methods revealed that three types of alterations: argillic, phyllic, and iron oxide zones occurring at the NE and SE of Abhar sheet, while the propylitic and silica zones are developed in NW and SW of the studied area. Lineaments were identified by aid of false color composite, high pass filters and hill-shade DEM techniques that two NW-SE and NE-SW major trends were determined. Geochemical anomalies were separated by number-size (N-S) method. Interpretation of N-S log-log plots of Cu in the area may be a result of the three steps of enrichment, i.e., mineralization and later dispersions. Field checks and Mineralgraphical studies also confirm the existence of suitable copper mineralization.

PL

Pokład geologiczny Abhar 1:100,100 zlokalizowany jest w obrębie kenozoicznego pasa skał magmowych pochodzenia wulkanicznego Tarom w północno-zachodnim Iranie. W pracy przedstawiono połączenie zastosowań metod zdalnych wykorzystujących technologię ASTER (Advanced Spaceborne Thermal Emission and Refelection Radiometer), analizę danych geochemicznych zebranych na podstawie osadów dennych ze strumieni oraz próbek skał w obrębie pola obserwacji a także danych mineralogicznych w celu rozpoznania skupisk rud miedzi. Na podstawie danych uzyskanych przy użyciu technologiiASTER i poddanych obróbce przy użyciu różnorodnych technik: badanie układu pasm, dopasowanie metodę najmniejszych kwadratów oraz minimalny współczynnik szumów, rozróżniono strefy przeobrażeń skał. Metody te pozwoliły na wykrycie trzech typów skał przeobrażonych: gliniaste, łupki ilasto-mikowe oraz strefy występowania tlenków żelaza występujące na północno-wschodnich (NE) i południowo- -zachodnich (NW) krańcach pasa Abhar. W części północno-zachodnie (NW) i południowo-zachodniej (SW) badanego obszaru stwierdzono występowanie stref propilitu i krzemianów. Lineacje wykryto przy pomocy metody badania zakresu barw, filtrów wysoko-przepustowych, techniki określania wysokości, na tej podstawie określono dwa główne trendy: NW-SE oraz NE-SW. Anomalie geologiczne wydzielono za pomocą metody N-S (liczba-wymiar). Interpretacja wykresów N-S wykonanych w skali logarytmicznej wykazała, że zaobserwowany układ może być wynikiem trzech etapów wzbogacania: mineralizacji i późniejszego rozproszenia. Badania terenowe oraz analizy mineralograficzne potwierdzają obecność odpowiednio zmineralizowanej miedzi.

Słowa kluczowe

EN

alteration zones; ASTER; geochemical data; Abhar; Iran

PL

strefy przeobrażeń skał; technologia ASTER; dane geochemiczne; pokład geologiczny Abhar; Iran

• Wydawca: Instytut Mechaniki Górotworu PAN
• Czasopismo: Archives of Mining Sciences
• Rocznik: 2013
• Tom: Vol. 58, no. 4
• Strony: 1071--1084
• Opis fizyczny: Bibliogr. 49 poz., rys., wykr.

Twórcy

autor

Nouri R.

• Department of Geology, North Tehran Branch, Islamic Azad University, Tehran

autor

Jafari M.

• Department of Geology, North Tehran Branch, Islamic Azad University, Tehran

autor

Arian M.

• Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran

autor

Feizi F.

• Department of Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

autor

Afzal P.

• Camborne School of Mines, University of Mines, University of Exeter, Penryn, UK

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